Antioxidant, Antibacterial and Anti-drug Ingredients in Plants

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Food Science and Technology".

Deadline for manuscript submissions: 15 April 2024 | Viewed by 3646

Special Issue Editors

Faculty of Food Engineering, University of Life Sciences "King Michael I" from Timisoara, 119 Calea Aradului, RO-300645 Timisoara, Romania
Interests: food safety and hygiene; food additives; food preservation; food waste management; essential oil; design and synthesis of materials
Special Issues, Collections and Topics in MDPI journals
Faculty of Food Engineering, Banat’s University of Agricultural Sciences and Veterinary Medicine “King Michael I of Romania” from Timisoara, Calea Aradului 119, RO-300645 Timișoara, Romania
Interests: agricultural products; plants active compounds; vegetal food technologies; functional and dietary foods
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Food spoilage results mainly when microbiological and chemical changes occur, making food products unacceptable to consumers. Various techniques, such as high-pressure processing, pulsed electric field, and modified atmosphere packaging, have been studied to prolong the foodstuff's life, including natural extracts and essential oils. Natural extracts and essential oils have recently been studied against resistant pathogenic microorganisms, whose higher resistance to conventional drugs represents a dramatic problem for human health and healthcare. It has been shown that their supplementation protects the sensory properties of foods, contributes significantly to increasing shelf life, and decreases food waste. Furthermore, their supplementation can reduce cellular oxidative stress, typical of cardiovascular, inflammatory, and neurodegenerative diseases, as well as certain types of cancer.

Consequently, due to such a vast repertory of beneficial outcomes, natural extracts and essential oils are always fascinating research fields. It must also be considered that agricultural by-products and waste products could represent a precious source of antioxidants and preservatives.

We warmly encourage you to submit your investigation findings to this Special Issue, which intends to collect original research manuscripts, systematic reviews, and meta-analyses covering all aspects of natural antioxidants, antibacterial applications, properties, and health effects. We look forward to your contributions.

Prof. Dr. Călin Jianu
Prof. Dr. Ersilia Alexa
Guest Editors

Manuscript Submission Information

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Keywords

  • antioxidant activity
  • antibacterial activity
  • plant extracts
  • essential oils
  • synergistic interactions
  • polyphenols
  • biofilms
  • radical scavenging
  • shelf life
  • waste products

Published Papers (2 papers)

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Research

12 pages, 1786 KiB  
Article
Effects of Tea Polyphenols Combined with Thermosonication on the Population of Salmonella enterica in Fresh-Cut Wax Gourd during Storage and Its ANFIS Survival Model
Appl. Sci. 2023, 13(8), 5087; https://doi.org/10.3390/app13085087 - 19 Apr 2023
Viewed by 677
Abstract
Fresh-cut vegetables are exposed to the risk of Salmonella spp. contamination. Effective sterilization methods and early warning systems play important roles in ensuring food safety of fresh-cut products. The aim of this study was to evaluate the effect of tea polyphenols (TP) combined [...] Read more.
Fresh-cut vegetables are exposed to the risk of Salmonella spp. contamination. Effective sterilization methods and early warning systems play important roles in ensuring food safety of fresh-cut products. The aim of this study was to evaluate the effect of tea polyphenols (TP) combined with thermosonication (TS) treatment on inactivation of Salmonella enterica in fresh-cut wax gourd and to develop and estimate models using adaptive neuro-fuzzy inference system (ANFIS) with different membership functions (MFs) for predicting S. enterica population during storage at 25, 10, and 4 °C, respectively. The results showed that both TP and TS treatment can effectively reduce the population of S. enterica in fresh-cut wax gourd. The combination of TP (1.0%) and TS (50 °C, 1 min) treatment followed by storage at 4 °C may be a suitable bacteriostatic scheme for the preservation of fresh-cut wax gourd. Fluorescence microscopy analyses indicated that TP and TS treatment could lead to the destruction of the cell membrane, followed by the leakage of cytoplasm, and, finally, cell death. ANFIS with the gaussmf function performed well in modeling and predicting the population of Salmonella in fresh-cut wax gourd and provided a powerful tool for modelling and predicting microbe population and the shelf life of food products. Full article
(This article belongs to the Special Issue Antioxidant, Antibacterial and Anti-drug Ingredients in Plants)
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25 pages, 5512 KiB  
Article
Influence of Sample Preparation/Extraction Method on the Phytochemical Profile and Antimicrobial Activities of 12 Commonly Consumed Medicinal Plants in Romania
Appl. Sci. 2023, 13(4), 2530; https://doi.org/10.3390/app13042530 - 16 Feb 2023
Cited by 3 | Viewed by 2633
Abstract
This paper aims to evaluate the influence of preparation and extraction methods on the phytochemical profile and microbiological activity of 12 medicinal plants from the west side of Romania. First, the proximate composition (humidity, proteins, lipids, and ash) and elemental composition of the [...] Read more.
This paper aims to evaluate the influence of preparation and extraction methods on the phytochemical profile and microbiological activity of 12 medicinal plants from the west side of Romania. First, the proximate composition (humidity, proteins, lipids, and ash) and elemental composition of the raw material were evaluated. Two levels of plant shredding were used: coarse shredding (CS) and fine grinding of plants to obtain powder (FG), and three extraction methods: conventional solvent extraction (CES), ultrasound-assisted extraction (UAE), and microwave extraction (MWE). The phytochemical profile investigated referred to antioxidant activity (AA), total polyphenol content (TPC), and flavonoid content (TFC), using spectrophotometric methods, and individual polyphenols detected using the LC/MS method. The preparation/extraction method for each medicinal plant was optimized using statistical analysis. The optimized extracts for each medicinal plant were tested to evaluate the antimicrobial potential against 9 standard strains. The results showed that the sample preparation method before extraction (shredding or grinding) influences the content of phytocompounds by increasing them in powder form. The use of green technologies, especially MWE, leads to the highest content of TPC, TFC, and AA. The TPC value ranged between 4.83–19.2 mgGAE/g DM in the samples CS and between 19.00–52.85 mgGAE/g DM in the samples FG. The highest antioxidant value was found in the Origanum vulgare extract, both in the case of the crushed sample (22.66 mM Fe2+/100 g) and the powder sample (81.36 mM Fe2+/100 g), followed by Melissa officinalis, The TFC values varied in the range of 1.02–3.46 mgQE/g DM when CES was used, between 2.36–12.09 mgQE/g DM for UAE, and between 1.22–9.63 mgQE/g DM in the case of the MWE procedure. The antimicrobial activity highlighted the effectiveness of the extracts, especially on the strains of H. influenzae, C. albicans, C. parapsilosis, S. aureus, and S. flexneri. Reduced antimicrobial activity was recorded for the strains of S. pyogenes and P. aeruginosa. The best antimicrobial activity was registered by Thymus serpyllum, with an inhibition rate of 132.93% against E. coli and 78.40% against C. albicans. Full article
(This article belongs to the Special Issue Antioxidant, Antibacterial and Anti-drug Ingredients in Plants)
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