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Review

Phytochemical Profile of Antibacterial Agents from Red Betel Leaf (Piper crocatum Ruiz and Pav) against Bacteria in Dental Caries

by
Leny Heliawati
1,*,
Seftiana Lestari
1,
Uswatun Hasanah
1,
Dwipa Ajiati
2 and
Dikdik Kurnia
2
1
Study Program of Chemistry, Faculty of Mathematics and Natural Science, Universitas Pakuan, Bogor 16143, Indonesia
2
Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Padjadjaran, Sumedang 45363, Indonesia
*
Author to whom correspondence should be addressed.
Molecules 2022, 27(9), 2861; https://doi.org/10.3390/molecules27092861
Submission received: 5 April 2022 / Revised: 22 April 2022 / Accepted: 27 April 2022 / Published: 30 April 2022
(This article belongs to the Topic Novel Antimicrobial Agents: Discovery, Design and New Therapeutic Strategies)
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Abstract

:
Based on data from The Global Burden of Disease Study in 2016, dental and oral health problems, especially dental caries, are a disease experienced by almost half of the world’s population (3.58 billion people). One of the main causes of dental caries is the pathogenesis of Streptococcus mutans. Prevention can be achieved by controlling S. mutans using an antibacterial agent. The most commonly used antibacterial for the treatment of dental caries is chlorhexidine. However, long-term use of chlorhexidine has been reported to cause resistance and some side effects. Therefore, the discovery of a natural antibacterial agent is an urgent need. A natural antibacterial agent that can be used are herbal medicines derived from medicinal plants. Piper crocatum Ruiz and Pav has the potential to be used as a natural antibacterial agent for treating dental and oral health problems. Several studies reported that the leaves of P. crocatum Ruiz and Pav contain secondary metabolites such as essential oils, flavonoids, alkaloids, terpenoids, tannins, and phenolic compounds that are active against S. mutans. This review summarizes some information about P. crocatum Ruiz and Pav, various isolation methods, bioactivity, S. mutans bacteria that cause dental caries, biofilm formation mechanism, antibacterial properties, and the antibacterial mechanism of secondary metabolites in P. crocatum Ruiz and Pav.

1. Introduction

The oral cavity is a place of growth for more than 700 species of microorganisms, which ultimately has many impacts on the health of the teeth and oral cavity. One of the health problems experienced globally is oral infectious diseases such as dental caries [1,2,3]. In 2017, the prevalence of dental caries in permanent teeth per 100,000 population in each country reached 20% to more than 50% [4]. The cause is the synergistic interaction of bacteria such as Streptococcus sanguinis and S. mutans to form a biofilm on the tooth surface [5,6,7,8,9]. The high prevalence of dental caries and the weakness of the strategies used today indicate an urgent need to identify alternative treatment options that are more effective and efficient, one of which is the use of medicinal plants [10].
Some studies reported that red betel leaf has the potential to be used as a natural antibacterial agent in treating dental and oral health problems. Red betel leaf contains secondary metabolites such as essential oils, flavonoids, alkaloids, and phenolic compounds that actively inhibit S. mutans [11,12]. Based on this, this review focuses on the antibacterial activity found in red betel leaf (P. crocatum Ruiz and Pav) which has been studied extensively [13]. This review will also discuss the relationship between antibacterial activity and the structure of several compounds contained in red betel leaf extract.

2. Gram-Positive and Negative Bacteria Cause Dental Caries

2.1. Gram-Positive Bacteria

2.1.1. Streptococcus mutans

S. mutans is a Gram-positive bacterium that is considered to be the microorganism that most often plays a role in tooth decay [14]. These bacteria are able to organize themselves in the bacterial community through cell–cell interactions and connections with other components present in the medium such as polysaccharides, proteins, and DNA to form biofilms [15,16]. Biofilm is a structured and organized community of microbial cells in a dynamic environment, enclosed and embedded in a three-dimensional (3D) extracellular matrix [17,18,19]. The cariogenic biofilm matrix formed by S. mutans is rich in exopolysaccharides and contains extracellular DNA (eDNA) and lipoteichoic acid (LTA) [20,21,22,23]. Microbial species are found in oral biofilms such as Candida albicans, Candida glabrata, Enterococcus faecalis, S. mutans, Veillonella dispar, Fusobacterium nucleatum, and many others [24].
One of the diseases caused by S. mutans is dental caries. There are several factors that cause dental caries to get worse including sugar, saliva, and also putrefactive bacteria [25,26,27]. In addition, the growth of bacteria in the mouth and forming biofilms is caused by several factors, namely saliva which plays a role in modulating the plaque layer on the teeth, the temperature in the environment around the mouth in the range of 35–36 °C, and pH 6.75–7.25 [28,29]. The mechanism of biofilm formation on teeth is followed by five stages, namely initial adhesion which produces extracellular polymeric substances, initial attachment where cell division occurs, formation of young biofilms, mature biofilms, and dispersed biofilms which cause cell autolysis [30] (Figure 1).
The pathogenesis of S. mutans begins after consuming something containing sugar, especially sucrose, a sticky glycoprotein (a combination of protein and carbohydrate molecules) that is retained on the teeth to initiate plaque formation on the teeth [31,32]. At the same time, millions of bacteria, including S. mutans, also survive on the glycoprotein. S. mutans has an enzyme called glucosyl transferase on its surface which is involved in glycolysis [25,33,34]. Glycolysis is the breaking down of glucose in sucrose that is carried out to obtain energy.
The glucosyltransferase enzyme continues to work, namely, to add more glucose molecules to form dextran which has a structure very similar to amylase in starch. Dextran together with other bacteria adheres tightly to the tooth enamel and subsequently forms plaque on the teeth [35,36]. In addition, glycolysis under anaerobic conditions also produces lactic acid. This lactic acid causes a decrease in pH to a certain extent so that it can destroy hydroxyapatite in the tooth enamel and cause the formation of a cavity or hole in the tooth [37,38] (Figure 2).

2.1.2. Streptococcus sanguinis

Streptococcus sanguinis is a type of Gram-positive bacteria that does not have spores and is a facultative anaerobe. Cell division in S. sanguinis occurs along a single axis and produces chains or pairs of cocci. The genome sequence of S. sanguinis SK36 isolated from dental plaque in humans has a circular DNA molecule consisting of 2,388,435 base pairs, with 2274 predicted protein codes. In tRNA, there are 61 genes that are predicted to be able to produce 20 amino acids and 50 carbohydrate transporters, including the phosphotransferase enzyme which functions to transport glucose, fructose, mannose, cellobiose, glucoside, lactose, trehalose, galactitiol, and maltose. S. sanguinis is able to utilize various carbohydrate sources to survive [39].
Oral biofilm formation begins with the attachment of S. sanguinis and other pioneering colonists to a macromolecular complex formed on the saliva-coated tooth surface [22,40,41,42]. S. sanguinis was the first bacterium to bind to the biofilm and a species that plays an important role in the oral biofilm ecosystem [43,44,45,46]. However, these bacteria also have a positive role, namely producing H2O2 as a means to produce excess oxygen and working as a non-specific antimicrobial agent that can trigger the growth of S. mutans and other anaerobic periodontal pathogens [47,48,49].
The negatively charged residue and electrostatic interactions with hydrophilic regions in salivary proteins facilitate the attachment of bacteria to the tooth surface to form the Acquired Enamel Pellicle (AEP). Although S. sanguinis can directly adhere to saliva-free hydroxyapatite, the major mineral found in tooth enamel, the initial attachment process is most likely driven by the interaction of the streptococcal surface with salivary components. Binding to salivary proteins is mediated through protein–protein or protein–carbohydrate interactions with receptors exposed on the bacterial surface. Amylase is the most abundant salivary protein and is present both in AEP and in dental plaque. S. sanguinis specifically binds to amylase via long filamentous pili [50,51].

2.2. Gram-Negative Bacteria

 Veillonella parvula

Veillonella parvula is an anaerobic Gram-negative coccus that is part of the normal flora found in the human mouth and digestive tract [52]. Human oral Veillonella species include V. parvula, V. dispar, V. atypica, V. denticariosi, V. rogosae, V. tobetsuensis, V. infantium, and V. nakazawae [53,54,55]. Lactate and malate are the preferred carbon sources by Veillonellae spp. These carbon sources will be metabolized into propionate, acetate, CO2, and H2 [56,57]. Pyruvate, fumarate, and oxaloacetate can also be metabolized, but citrate, iso-citrate, and malonate are not. Succinate catabolism has been reported to have not resulted in suboptimal growth [58]. The balanced stoichiometry of lactate catabolism is (Equation (1)) [59]:
8 Lactate → 5 Propionate + 3 Acetate + 3 CO2 + H2
Evidence that Veillonellae spp. acts as a linking species in biofilm development has been demonstrated in both in vivo and in vitro studies. Human epidemiological studies have shown Veillonellae spp. to be very abundant in both supra and sub-gingival plaques as well as on the tongue and in saliva [60,61,62,63,64]. Veillonella spp. (especially V. parvula) was found to be associated with dental caries in children [58,65]. Besides that, it was also found in adults. V. parvula was also one of the most abundant and prevalent bacteria in all samples of both healthy and carious teeth. However the abundance of V. parvula in carious tooth samples appears to be higher [66]. The physiological relationship between Veillonellae (as lactate users) and S. mutans (as lactate producers) has prompted many clinical studies on the relationship of Veillonellae with caries. Research conducted by Aas et al. [67] also demonstrated the association of the genera Veillonella with caries development. Belstrom et al. reported that Streptococcus spp. and Veillonella spp. were the most dominant genera among all saliva samples from 292 participants with mild to moderate dental caries [68].
It can be argued that the observed association between cariogenic bacteria and Veillonella stems from the metabolic need to produce organic acids which are indeed found in higher concentrations in active caries. Therefore, the presence of Veillonellae can be an indication of, and prediction of, a local decrease in pH. Bradshaw and Marsh reported that the number and proportion of S. mutans and Lactobacillus spp. increases as the pH decreases, especially below low pH [65]. Similarly in another clinical study, Gross et al. found the proportion of Veillonellae spp. increased commensurate with the proportion of Streptococcus spp. [69]. In other words, Veillonellae can be a risk factor for caries initiation, whereas S. mutans are a risk factor for caries development.

3. Antibacterial

3.1. Definition

An antibacterial is a substance that can inhibit the growth of bacteria and will kill pathogenic bacteria [70]. Antibacterial substances are divided into two types, namely bacteriostatic which suppresses bacterial growth and bactericidal which can kill bacteria [71]. Bacteria have evolved a lot to be able to survive in various environments and can develop resistance to various antibacterial reagents quickly [72]. Inhibition of bacteria can be through several synthesis pathways in bacteria, namely the bacterial cell wall biogenesis pathway, DNA replication pathway, transcription pathway, and protein biosynthesis pathway [73]. The cell wall structure consists of peptidoglycan which provides a mechanical effect on bacteria to maintain morphology. The peptidoglycan layer is formed from N-acetyl glucosamine and N-acetylmuramic acid linked by 1,4-glycosidic bonds [74].

3.2. Antibacterial Mechanism of Secondary Metabolic Compounds

Several secondary metabolites that are isolated from plants can be natural antibacterial agents. Each compound has their own antibacterial mechanism in inhibiting bacteria. Their mechanism will be explained in the following:

3.2.1. Phenol

The mechanism of phenol as an antibacterial agent acts as a toxin in the protoplasm, damaging and penetrating the wall, causing the function of selective permeability, active transport, and protein composition control, so that bacterial cells become deformed and lysed [75,76,77].

3.2.2. Flavonoids

Flavonoids work to inhibit bacterial growth by inhibiting nucleic acid synthesis, changing cytoplasmic membrane function, inhibiting energy metabolism, reducing cell attachment and biofilm formation, inhibiting porin in cell membranes, and disrupting permeability of cell walls and membranes to cause bacterial cell lysis [38,78,79,80,81]. In addition, flavonoids also act as inhibitors of the FabZ enzyme and inhibit the production of fimbriae [82].

3.2.3. Saponins

Meanwhile, the saponins themselves work as antibacterial agents by disrupting the stability of the bacterial cell membrane, causing bacterial cell lysis [75,83,84,85].

3.2.4. Terpenoids

Terpenoids work as antibacterials by disrupting the function of cell membranes to cause damage to bacterial cell membranes, interfering with glucosyltransferase activity, inactivating thiol-containing enzymes and causing bacterial death [86,87,88,89,90,91,92,93,94,95,96,97].

3.2.5. Alkaloids

Alkaloids inhibit growth and kill bacteria by interfering with the permeability of cell walls and membranes, inhibiting of nucleic acid and protein synthesis, and inhibiting bacterial cell metabolism to cause lysis. Moreover, alkaloids can also act as inhibitors in the protein biosynthesis process in bacterial cells [98,99,100].

3.2.6. Tannins

Tannins work by coagulating bacterial protoplasm, precipitating proteins, and binding proteins to inhibit the formation of bacterial cell walls [101,102,103] (Figure 3).

3.3. Antibacterial Mechanism with MurA Enzyme

In addition, the antibacterial mechanism can be carried out by inhibiting the action of the MurA enzyme that catalyzes the first step of bacterial cell wall biosynthesis. Therefore, the inhibition of the activity of oral pathogenic bacteria can be undertaken by inhibiting the enzyme MurA [104]. In cell wall peptidoglycan biosynthesis, the enzyme MurA involves the transfer of the enolpyruvate group from phosphoenolpyruvate (PEP) to UDP-N-acetylglucosamine (UNAG) to form UDP-N-acetylglucosamine enolpyruvate (UNAGEP) [90,91].
Based on the performance of fosfomycin, the inhibition of the MurA enzyme is competitive. Antibiotics act as PEP analogues and form covalent bonds with the active cysteine residue of the enzyme as shown in the figure below. Antibiotics interact with enzymes and UDP-N-acetylglucosamine and then form hydrogen bonds with different segments of the polypeptide chain. In addition, hydrogen bonds can be formed between the hydroxyl group of phosphomycin and the C-3 hydroxyl of the sugar ring UDP-N-acetylglucosamine and between one of its phosphonate oxygen atoms and the nitrogen amide of UDP-N-acetylglucosamine [105] (Figure 4).

3.4. Commonly Used Dental Caries Antibiotics

To control caries mediated by pathogenic bacteria, dental and oral hygiene products are widely used which consist of chemical compounds, such as fluoride, chlorhexidine, triclosan, cetylpyridinium chloride, and chlorophyll.

3.4.1. Fluoride

Fluoride is the most effective caries prevention agent. Since the 1940s, it has been added to water supplies and oral care products, such as toothpaste, mouthwash, and dental floss [107]. In fact, the use of oral hygiene products containing fluoride reduced the prevalence of caries by 24–26% in permanent teeth. Water fluoridation in the range of 0.50–1.00 mg/L−1 is a cost-effective method for moderating caries potential [108]. In addition, the combination of nicomethanol hydrofluoride with siliglycol further enhances fluoride uptake by teeth and controls or inhibits dental biofilm development and strengthens tooth structure [109]. However, the use of fluoride for oral health also causes side effects, such as the emergence of fluoride-resistant strains [110,111]

3.4.2. AIK(SO4)2

AIK(SO4)2 was found to be able to reduce fissure caries, both smooth surface and sulcus caries. The mechanism of dental caries treatment of alum may be almost the same as the mechanism of dental caries treatment using fluoride [112].

3.4.3. Chlorhexidine (CHX)

Dental and oral hygiene products consist of another chemical compound, namely chlorhexidine (CHX). Chlorhexidine is a symmetric bis-biguanide agent consisting of two chloroguanide chains linked by a central hexamethylene chain and has diverse medical applications as a surface disinfectant and as an antiseptic for topical application. Chlorhexidine carryes two positive charges at physiological pH which can interact electrostatically with negatively charged phospholipids (CHX) and has been used to control dental caries caused by acid-tolerant bacteria such as S. mutans since the 1970s [113]. However, the use of chlorhexidine also causes certain disadvantages with long-term use such as tooth staining and taste changes [114]. It is also believed that the continued and increasing use of chlorhexidine can lead to the emergence of new strains of mycobacteria with lower susceptibility
High prevalence of dental caries and the weakness of the strategies used today indicate an urgent need to identify alternative treatment options that are more effective, efficient, and non-toxic, one of which is by utilizing herbal medicines derived from medicinal plants [115]. In recent decades, research focus has also shifted to herbal medicines due to increasing bacterial resistance and side effects of antimicrobial agents. Extracts of plant origin can enhance antibiotic efficacy when used in combination against bacterial pathogens [10]. In addition, the use of medicinal plants or natural products is indeed a safe approach for rapid clinical translation because they are generally recognized as safe by the United States Food and Drug Administration.

4. Piper crocatum Ruiz and Pav

Based on some research literature, it has been reported that red betel leaf has the potential to be used as a natural antibacterial agent in treating dental and oral health problems. Red betel leaf (P. crocatum Ruiz and Pav) is a plant that grows in the tropics and was previously known as an ornamental plant, but was later used as a medicinal plant [116]. P. crocatum Ruiz and Pav is a natural ingredient that has the potential to treat dental caries and the leaf contains secondary metabolites such as essential oils, flavonoids, alkaloids, and phenolic compounds which may be active against S. mutans that plays a role in caries formation. The use of red P. crocatum Ruiz and Pav is traditionally useful in curing diseases such as canker sores and toothache. The red betel leaf decoction which is an antiseptic can act as a mouthwash, preventing bad breath. From chromatography it is known that P. crocatum Ruiz and Pav leaf contains flavonoid compounds, polyphenol compounds, tannins, and essential oils, where flavonoids are known to be inhibitors of the growth of S. mutans [11,50].

4.1. Isolation of Secondary Metabolites of Piper crocatum Ruiz and Pav

Several studies reported the isolation of P. crocatum Ruiz and Pav by many methods. Li et al., 2019 isolated 2.60 kg of dried red betel leaf samples, then extracted by reflux method using methanolic solvent (5 L × 3 times). The results of the isolation of P. crocatum Ruiz and Pav leaves revealed 23 compounds including 15 phenolic compounds (1–15), two monoterpenes (16 and 17), three sesquiterpene compounds (19–21), phenolic amide glycosides (22), neolignans (23), and the flavonoid compound C-glycoside (24). The structure of the compounds obtained was identified through spectroscopic methods and compared with the literature. Seven compounds (7, 11, 13, 14, 17, 20, and 24) of the species P. crocatum Ruiz and Pav and 17 others (1–6, 8–10, 12, 15–16, 18–19, and 21–23) from the genus Piper and the family Piperaceae were isolated and reported for the first time [117] (Figure 5).
Another isolation method was carried out by Emrizal et al., 2014 for P. crocatum Ruiz and Pav, as much as 0.84 kg were extracted at room temperature with methanolic solvent to obtain a crude methanolic extract of 253.27 g (30.11%) after which the extract was evaporated, and they proceeded to separate the components of the compound. The results of the isolation obtained two compounds from the P. crocatum Ruiz and Pav plant which were then identified based on literature data and spectroscopic analysis. It was concluded that the two compounds were β-sitosterol and 2-(5′,6′-dimethoxy-3′,4′-methylenedioxyphenyl)-6-(3″,4″,5-trimethoxyphenyl)-dioxabiclo [3,3,0] octane. In addition, the two compounds were also reported to have antitumor activity with an IC50 value of 2.04; 1.34, 2.08, and 27.40 g/mL in the fractions of n-hexane, ethyl acetate, buthanolic, and methanolic extract, respectively [118] (Figure 6).
Arbain et al., 2018 isolated a 1.10 kg sample of P. crocatum Ruiz and Pav by using the maceration extraction method twice with methanolic solvent (5 L) for 48 h. Two new bicyclo [3.2.1] octanoid neolignans of the guianine type, crocatin A and crocatin B, together with the known compounds pachypodol and 1-triacontanol isolated from Indonesian P. crocatum Ruiz and Pav leaf. Its structure and configuration were determined by 1D- and 2D-NMR, MS spectroscopy, and single-crystal X-ray diffraction analysis [119] (Figure 7).
In a study conducted by Chai et al. (2021), 2.60 kg of dried leaves of P. crocatum Ruiz and Pav were isolated which were then extracted using the reflux method using methanol (5 L × 3 times) as a solvent. The isolation results reported that four bicyclo [3.2.1] octanoid neolignans were isolated from the methanolic extract of P. crocatum Ruiz and Pav. Neolignans were identified as pipcroside A, pipcroside B, pipcroside C, and crocatin B. In addition, this study by Chai et al., 2021 also provides the basis for further exploration of P. crocatum Ruiz and Pav and bicyclo [3.2.1] octanoid neolignans from the Piper plant as a new source of natural antineoplastic agents [120] (Figure 8).

4.2. Bioactivity of Piper crocatum Ruiz and Pav

The Piperaceae family is one type of plant that is often found in the surrounding environment and several types of plants in that family are classified as dicotyledonous plants. One of them that is often used by the community as a traditional medicinal plant is the Piper genus. It has more than 700 species spread throughout the world and commercial, economic, and medicinal importance. Many plant species of this genus have high potential for local and industrial uses, as well as applications in botanical pharmacy, pharmacognosy, and traditional medicine. The efficacy of the drug basically comes from several secondary metabolite compounds contained in the plant.
Secondary metabolites of the Piper genus, in addition to their unique structure, are also reported to have potential as bioactive compounds. Tests for the bioactivity of this genus have been carried out on both extracts and pure compounds. The isolation results support its use in traditional medicine (Table 1).
Like plants from other Piper genera, P. crocatum Ruiz and Pav also has some bioactivity, both from the level of extract, fraction and isolation results, and several instances of bioactivity of red betel have been reported. In the table below are some studies of isolation of P. crocatum Ruiz and Pav with various kinds of bioactivity of each (Table 2).

4.3. Antibacterial Activity of Red Betel Extract

One of the examples of bioactivity of P. crocatum Ruiz and Pav, which is the topic of this review, is antibacterial activity. Especially, the antibacterial activity of red betel against the bacteria S. mutans, S. sangguinis, V. parvula, and other bacteria found in the oral cavity that cause dental and oral health problems, one of which is dental caries. Therefore, the potential of red betel as an antibacterial agent can be understood by looking at several studies that have been reported. The table below shows data from previous research reports that reported the antibacterial ability of red betel leaf extract (Table 3).
In research conducted by Rizkita et al. (2017), the research procedure includes four stages, namely plant determination, betel leaf oil refining, identification of betel oil components, and betel oil activity test, then the two oils are compared. Further component identification was carried out by mass spectrometry. The results of mass spectrometry will obtain the mass spectrum of each peak detected on the GC chromatogram. The mass spectra analysis was based on the value of Similarity Index (SI), base peak, and the fractional trend of the mass spectra compared to the library mass spectra, namely WILEY229.LIB. It was reported that the isolation results from P. betle L. and P. crocatum Ruiz and Pav contain essential oils which consist of five main active compounds that have antibacterial properties. The test was carried out by applying the disc method. The media used was Mueller Hinton Agar media because in this medium S. mutants bacteria lived optimally. The agar media that had been planted with the test bacteria were filled with samples of green betel oil and red betel oil with concentration variations (100, 75, 50, and 25%), propylene glycol solvent as a negative control, and amoxicillin as a positive control (Figure 9) [13].
These compounds are terpenoid group compounds including camphene, sabinene, cariophilene, humulena, and germakron in green betel while the terpenoid compounds in red betel leaf include sabinene and mirsen. The antibacterial activity test of these compounds proved that there was an inhibition of the growth of S. mutans bacteria. Antibacterial compounds are thought to be able to inhibit the growth of Gram-positive bacteria by penetrating the cell wall, the cell wall of Gram-positive bacteria has a simple composition consisting of 60–100% peptidoglycan, which is made of N-acetyl glucosamine and N-acetyl muramate. The simple arrangement of the cell wall and the absence of an outer membrane causes antibacterial compounds to penetrate the cell wall and interfere with the cell wall biosynthesis process.
Sesquiterpene compounds have hydrophobic properties that cause disruption of the integrity of bacterial cells by reducing intracellular ATP reserves, lowering cell pH, being absorbed and penetrated into bacterial cells, then bacteria will experience precipitation and protein denaturation, and will lyse bacterial cell membranes. The difference in the concentration of the content contained in green betel leaf and red betel leaf contains 1.00–4.20% (w/v) essential oil yield, chavicol 7.20–16.70%, cavibetol 2.70–6.70%, and eugenol 26.80–42.50%. Meanwhile, the yield of red betel leaf was 0.73 (w/v), chavicol 5.10–8.20%, and eugenol 26.10–42.50%.

5. Conclusions

Medicinal plants of P. crocatum Ruiz and Pav have a significant role in applications of ethno-medicine. They contain secondary metabolites that have several examples of bioactivity, such as antioxidant, antimicrobial, antibacterial, antifungal, anti-inflammatory, and others. The bioactivity is influenced by the structure and functional groups of each secondary metabolite compound contained therein. Based on several research reports, it can be seen that P. crocatum Ruiz and Pav has considerable potential as an antibacterial agent in the treatment of oral health problems such as dental caries with several different methods. Secondary metabolites contained in P. crocatum Ruiz and Pav have their own mechanism to inhibit bacteria. This scientific finding is useful information for further drug research and development to find new potential antimicrobial agents.

Author Contributions

Conceptualization, L.H., S.L. and D.K.; methodology, L.H. and D.A.; software, L.H.; validation, L.H. and D.A.; formal analysis, D.K. and U.H.; investigation, L.H.; resources, L.H., and S.L.; data curation, D.K.; writing—original draft preparation, L.H., S.L. and D.A.; writing—review and editing, L.H. and D.A.; visualization, D.A.; supervision, D.K.; project administration, D.K.; funding acquisition, L.H. All authors have read and agreed to the published version of the manuscript.

Funding

This research received no external funding.

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Data Availability Statement

The study did not report any data.

Acknowledgments

The authors are grateful to Indonesian Ministry of Research, Technology and Higher Education for Grant of PDUPT—DIKTI 2022, and to Universitas Pakuan for all research facilities.

Conflicts of Interest

The authors declare no conflict of interest.

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Molecules 27 02861 g001 550
Figure 1. (A) Co-aggregation between S. mutans and filaments in developing dental biofilm; (B) typical corncob formation [30].
Figure 1. (A) Co-aggregation between S. mutans and filaments in developing dental biofilm; (B) typical corncob formation [30].
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Molecules 27 02861 g002 550
Figure 2. Contribution of S. mutans in the process of biofilm formation [39].
Figure 2. Contribution of S. mutans in the process of biofilm formation [39].
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Molecules 27 02861 g003 550
Figure 3. Pathway of inhibition of bacteria by antibacterial agents [73].
Figure 3. Pathway of inhibition of bacteria by antibacterial agents [73].
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Molecules 27 02861 g004 550
Figure 4. Catalytic reaction on the MurA enzyme [106].
Figure 4. Catalytic reaction on the MurA enzyme [106].
Molecules 27 02861 g004
Molecules 27 02861 g005a 550Molecules 27 02861 g005b 550
Figure 5. Compounds obtained from the methanol extract of red betel leaf. (1) (8R)-8-(4-hydroxy-3,5-dimethoxy)-propane-8-ol-4-O-β-D-glucopyranoside; (2) 4-Allyl-2,6-dimethoxy-3-hydroxy-1-D-glucopyranoside; (3) 3-[(1E)-3-hydroxy-1-propen-1-yl]-2,5-dimethoxyphenyl-D-glucopyranoside; (4) Cimidahurinin; (5) Erigeside II; (6) Syringe; (7) β-phenylethyl-β-D-glucoside; (8) Methylsalicylate-2-O-β-D-glucopyranoside; (9) Icariside D1; (10) 4-Hydroxybenzoic acid-D-glucosylester; (11) Benzyl-β-D-glucoside; (12) Phenylmethyl-6-O-α-L-arabinofuranosyl-β-D-glucopyranoside; (13) Hydroxytyrosol-1glucopyranoside (14) Gentisic acid; (15) Catechaldehyde; (16) (S)-Menthiafolic acid; (17) Ioliolide; (18) 5β,6β-dihydroxy-3α-(β-D-glucopyranosyloxy)-7E-Megastigmen-9-one; (19) (3E)-4-[(1S,2S,4S)-4-(β-D-glucopyranosyloxy)-1,2-dihydroxy-2,6,6-tri-methylcyclohexyl]3-buten-2-one; (20) (6S,9S)-roseoside; (21) Cuneataside E (22) N-trans-feruloyltyramine-4′-O-β-D-glucopyranoside; (23) Syringaresinol-β-D-glucoside; and (24) Vitexin 2″-O-rhamnoside.
Figure 5. Compounds obtained from the methanol extract of red betel leaf. (1) (8R)-8-(4-hydroxy-3,5-dimethoxy)-propane-8-ol-4-O-β-D-glucopyranoside; (2) 4-Allyl-2,6-dimethoxy-3-hydroxy-1-D-glucopyranoside; (3) 3-[(1E)-3-hydroxy-1-propen-1-yl]-2,5-dimethoxyphenyl-D-glucopyranoside; (4) Cimidahurinin; (5) Erigeside II; (6) Syringe; (7) β-phenylethyl-β-D-glucoside; (8) Methylsalicylate-2-O-β-D-glucopyranoside; (9) Icariside D1; (10) 4-Hydroxybenzoic acid-D-glucosylester; (11) Benzyl-β-D-glucoside; (12) Phenylmethyl-6-O-α-L-arabinofuranosyl-β-D-glucopyranoside; (13) Hydroxytyrosol-1glucopyranoside (14) Gentisic acid; (15) Catechaldehyde; (16) (S)-Menthiafolic acid; (17) Ioliolide; (18) 5β,6β-dihydroxy-3α-(β-D-glucopyranosyloxy)-7E-Megastigmen-9-one; (19) (3E)-4-[(1S,2S,4S)-4-(β-D-glucopyranosyloxy)-1,2-dihydroxy-2,6,6-tri-methylcyclohexyl]3-buten-2-one; (20) (6S,9S)-roseoside; (21) Cuneataside E (22) N-trans-feruloyltyramine-4′-O-β-D-glucopyranoside; (23) Syringaresinol-β-D-glucoside; and (24) Vitexin 2″-O-rhamnoside.
Molecules 27 02861 g005aMolecules 27 02861 g005b
Molecules 27 02861 g006 550
Figure 6. Compounds obtained from the methanolic extract of red betel leaf (P. crocatum Ruiz and Pav). (25) β-sitosterol and (26) 2-(5′,6′-dimethoxy-3′,4′-methylenedioxyphenyl)-6-(3″,4″,5-trimethoxyphenyl)-dioxabiclo [3,3,0] octane.
Figure 6. Compounds obtained from the methanolic extract of red betel leaf (P. crocatum Ruiz and Pav). (25) β-sitosterol and (26) 2-(5′,6′-dimethoxy-3′,4′-methylenedioxyphenyl)-6-(3″,4″,5-trimethoxyphenyl)-dioxabiclo [3,3,0] octane.
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Molecules 27 02861 g007 550
Figure 7. Compounds obtained from the methanolic extract of red betel leaf (P. crocatum Ruiz and Pav). (27) Crocatin A; (28) Crocatin B; (29) Pachypodol [4′,5-dihydroxy-3,3′,7-trimethoxyflavone]; and (30) 1-Triacontanol.
Figure 7. Compounds obtained from the methanolic extract of red betel leaf (P. crocatum Ruiz and Pav). (27) Crocatin A; (28) Crocatin B; (29) Pachypodol [4′,5-dihydroxy-3,3′,7-trimethoxyflavone]; and (30) 1-Triacontanol.
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Molecules 27 02861 g008 550
Figure 8. Compounds obtained from the methanolic extract of red betel leaf. (31) Pipcroside A; (32) Pipcroside B; (33) Pipcroside C; and (34) Bicyclo [3.2.1] octanoid neolignans.
Figure 8. Compounds obtained from the methanolic extract of red betel leaf. (31) Pipcroside A; (32) Pipcroside B; (33) Pipcroside C; and (34) Bicyclo [3.2.1] octanoid neolignans.
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Figure 9. Structure of compounds of isolated red betel leaf oil. (35) Camphene and (36) Myrcene [13].
Figure 9. Structure of compounds of isolated red betel leaf oil. (35) Camphene and (36) Myrcene [13].
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Table
Table 1. Bioactivity of isolated Piper genus.
Table 1. Bioactivity of isolated Piper genus.
No.SpeciesSecondary MetabolitesPlant PartsBioactivityReferences
1P. betlePhenylpropanoidLeafAntioxidantAtiya et al., 2018 [121]
2P. terminaliflorum tsengFurfuran LignanAll parts of plantAnticancerT. Liu et al., 2018 [122]
3P. chimonantifoliumFlavonoids
Steroids		LeafAntifungalLago et al., 2012 [123]
4P. montealegreanumMonoterpens
Seskuiterpens		Twig Da S. Alves et al., 2011 [124]
5P. hispidumChalcones,
Flavanone		LeafAntileishmanialRuiz et al., 2011 [125]
6 P. maingayiAmida TwigAntibacterialHashim et al., 2019 [126]
7P. officinarumPhenylpropanoid
Alkaloids
Triterpene 		TwigAntioxidantSalleh et al., 2014 [127]
8P. taiwanenseAmidaAerialAntioxidantChen et al., 2017 [128]
9 P. sarmentosumFlavonoidsLeafAntioxidantUgusman et al., 2011 [129]
10P. solmsianum C.FlavonoidsTwigAntifungalDe Campos et al., 2005 [130]
11P. betle L.TerpenoidLeafAntibacterialBatubara et al., 2011 [131]
12P. betle L.PhenolicLeafAntibacterialKurnia et al., 2020 [132]
13P. ningrumAlkaloid-piperidine FruitAnticancerReshmi et al., 2010 [133]
Table
Table 2. Bioactivity of isolated P. crocatum Ruiz and Pav leaves.
Table 2. Bioactivity of isolated P. crocatum Ruiz and Pav leaves.
No.Secondary MetabolitesPlant PartsBioactivityReferences
1Flavonoids
Terpenoids
Steroids		LeafAntitumorEmrizal et al., 2014 [118]
22 flavonoids
2 monoterpenes
3 seskuiterpenes
17 Glucoside 		LeafAnti-inflammatoryLi et al., 2019 [117]
312 PhenolicLeafHypoallergenicLi et al., 2019 [134]
4Bicyclo[3,2,1]Octanoid NeolignaneLeafPyruvate dehydrogenase inhibitorsChai et al., 2021 [120]
5Essential OilLeafAntibacterialRizkita et al., 2017 [13]
Table
Table 3. Antibacterial activity methods of red betel extract (P. crocatum Ruiz and Pav).
Table 3. Antibacterial activity methods of red betel extract (P. crocatum Ruiz and Pav).
No.CompoundsTypes of BacteriaMethodsReferences
1Flavonol
Chalcone
Anthocyanins		S. mutansThe Kirby–Bauer method of the disc diffusion test combined with UV irradiating treatment was used. The results showed the diameter of the inhibition zone (15.00 ± 0.05) mm for 10 watt and (15.96 ± 0.05) mm for 15 watt.Dyah Astuti et al., 2020 [135]
2Alkaloids
Steroids
Tannins		B. subtilis
P. aeuruginosa		Antibacterial activity was tested using the well method. Inhibited the growth of B. substilis and P. aeruginosa bacteria but the activity was weak, the inhibition zone was < 5 mm.Puspita et al., 2019 [136]
3Flavonoid
Saponin
Tannins
Phenolic		Staphylococcus epidermidisBacterial test was carried out using the well method, extract concentrations of 50 and 100% could inhibit the growth of S. epidermidis.Januarti et al., 2019 [137]
4TanninsStaphylococcus aureusTests using the well method can inhibit S. aureus bacteria. Maceration extraction technique to get the average inhibition zone of 12.30 mm.Soleha, 2018 [138]
5Flavonoids
Alkaloids
Tannins
Essential oil		Porphyromonas gingivalis
S. viridians		The antibacterial test was carried out using the well method, the inhibition zone on P. gingivalis was 10.34 mm while S. viridians was 8.42 mm. Pujiastuti et al., 2015 [139]
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Heliawati, L.; Lestari, S.; Hasanah, U.; Ajiati, D.; Kurnia, D. Phytochemical Profile of Antibacterial Agents from Red Betel Leaf (Piper crocatum Ruiz and Pav) against Bacteria in Dental Caries. Molecules 2022, 27, 2861. https://doi.org/10.3390/molecules27092861

AMA Style

Heliawati L, Lestari S, Hasanah U, Ajiati D, Kurnia D. Phytochemical Profile of Antibacterial Agents from Red Betel Leaf (Piper crocatum Ruiz and Pav) against Bacteria in Dental Caries. Molecules. 2022; 27(9):2861. https://doi.org/10.3390/molecules27092861

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Heliawati, Leny, Seftiana Lestari, Uswatun Hasanah, Dwipa Ajiati, and Dikdik Kurnia. 2022. "Phytochemical Profile of Antibacterial Agents from Red Betel Leaf (Piper crocatum Ruiz and Pav) against Bacteria in Dental Caries" Molecules 27, no. 9: 2861. https://doi.org/10.3390/molecules27092861

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