Advances in Chemistry, XXVIth International Galician Portuguese Conference on Chemistry

Topic Information

Dear Colleagues,

The International Galician–Portuguese Conference on Chemistry is celebrating its 26th edition in 2022. This is the first time since the beginning of the COVID-19 pandemic that scientists can attend this conference in person again to exchange their ideas. The conference keeps in its name its historical roots because, more than 25 years ago, the Galician and Portuguese Associations of Chemists decided to create a periodic forum to meet in person, share knowledge, and incubate collaborations. Furthermore, the venue of the conference alternates annually between Portugal and Spain. The conference was envisioned as a forum where master's and Ph.D. students take a predominant role to showcase their own research and establish friendly relations with other colleagues. Since those early days, the conference has attracted people from all over Portugal, Spain, some nearby countries, and, recently, an increasing number of Latin-American scientists. In the last editions, ca. 400 communications were presented (including posters and oral presentations). We are absolutely honoured by the Plenary Conferences delivered by two Nobel Laureates on chemistry: Professor Tomas Lindahl (Nobel Prize 2015) and Professor Stanley Whittingham (Nobel Prize 2019). This year, the conference is taking things a step further and presenting the opportunity for relevant communications presented in its different sessions to be published. For this, we encourage attendants to prepare scientific papers and submit them to the Special Issues of the journals that the prestigious Open Access Publisher MDPI has opened for us. There is no doubt this would be a major opportunity and exciting challenge for young researchers. Thank you very much to all of you for participating and to MDPI for their support.

Dr. Jose Manuel Andrade
Dr. Luis Cuadros-Rodríguez
Topic Editors

Participating Journals

Journal Name	Impact Factor	CiteScore	Launched Year	First Decision (median)	APC
Chemosensors chemosensors	4.2	3.9	2013	17.9 Days	CHF 2700
Foods foods	5.2	5.8	2012	13.1 Days	CHF 2900
Molecules molecules	4.6	6.7	1996	14.6 Days	CHF 2700
Nanomaterials nanomaterials	5.3	7.4	2010	13.6 Days	CHF 2900
Toxics toxics	4.6	3.4	2013	14.7 Days	CHF 2600

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Published Papers (4 papers)

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All Chemosensors Foods Molecules Nanomaterials Toxics

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16 pages, 2315 KiB  

Open AccessArticle

Disposable Microfluidic Paper-Based Device for On-Site Quantification of Urinary Creatinine

by Maria M. P. Melo, Ana Machado, António O. S. S. Rangel and Raquel B. R. Mesquita

Chemosensors 2023, 11(7), 368; https://doi.org/10.3390/chemosensors11070368 - 29 Jun 2023

Cited by 2 | Viewed by 1017

Abstract

In this work, a new microfluidic paper-based analytical device (µPAD) was developed for on-hand creatinine quantification in urine samples. When compared to conventional methods, this innovative paper device is more accessible and portable, it provides low-cost analysis (cost of consumables of 40 cents), [...] Read more.

In this work, a new microfluidic paper-based analytical device (µPAD) was developed for on-hand creatinine quantification in urine samples. When compared to conventional methods, this innovative paper device is more accessible and portable, it provides low-cost analysis (cost of consumables of 40 cents), and it is applicable to non-invasive biological fluids. Furthermore, the paper-based approach is used within an environmentally friendly assembly with no need for wax printing and small amounts of reagents resulting in low waste production and easy disposal by incineration. Its assembly method includes cutting paper discs arranged into several reading units within a plastic pouch, enabling effective creatinine quantification with accuracy based on a vertical flow approach. The method is based on the colourimetric reaction between creatinine and alkaline picric acid, where the solution colour changes from yellow to orange/red. Under optimal conditions, the developed method allowed creatinine quantification in the dynamic range of 2.20–35.0 mg/dL, with a limit of detection (LOD) of 0.66 mg/dL and a limit of quantification (LOQ) of 2.20 mg/dL. The colour intensity developed was processed in ImageJ software, based on digital image scanning, performed in 20 min (up to 4 h) after the sample insertion. The device is stable for up to one week when stored in a vacuum at 4 °C. The method was validated by comparing the results with a batch-wise procedure, where there were no statistically significant differences between both methods. Full article

(This article belongs to the Topic Advances in Chemistry, XXVIth International Galician Portuguese Conference on Chemistry)

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16 pages, 4127 KiB  

Open AccessArticle

Sustainable Low-Cost Phosphorus Recovery Using Nanostructured Materials with Reusability Potential

by David Gómez-Carnota, José L. Barriada, Pilar Rodríguez-Barro, Manuel E. Sastre de Vicente and Roberto Herrero

Nanomaterials 2023, 13(7), 1167; https://doi.org/10.3390/nano13071167 - 24 Mar 2023

Cited by 1 | Viewed by 1331

Abstract

A new low-cost material with a polymeric base formed from sodium silicate was developed. The material presents a nanostructured, highly rich iron surface with a large phosphorus retention capacity and potential reuse as a crop fertilizer. In the present study, we demonstrate that [...] Read more.

A new low-cost material with a polymeric base formed from sodium silicate was developed. The material presents a nanostructured, highly rich iron surface with a large phosphorus retention capacity and potential reuse as a crop fertilizer. In the present study, we demonstrate that iron is the element that acts as an adsorbent for phosphate, while the polymeric base functions exclusively as a support for iron. The iron is uniformly adsorbed on the surface of the material, forming nanostructures, which ensure that iron works similarly to nanoparticles in solution but avoid other problems, such as particle agglomeration or the difficulty of separating them after the removal process. Materials were characterised by SEM, EDS, N₂ sorption, and image processing, and the effect of pH, ionic strength, and temperature was studied. Sorption kinetics were analysed using Boyd’s diffusion model, and adsorption equilibria were studied using several adsorption models. A maximum iron adsorption on the polymeric base of 23.9 ± 0.3 mg Fe∙g⁻¹ was found, while maximum phosphorus adsorption was 366 ± 21 mg P∙g⁻¹ Fe. Thus, phosphorus is recovered from the aqueous medium with an inexpensive material that has the potential to be used directly as a fertilizer. Full article

(This article belongs to the Topic Advances in Chemistry, XXVIth International Galician Portuguese Conference on Chemistry)

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9 pages, 286 KiB  

Open AccessArticle

Serum Iodine and Bromine in Chronic Hemodialysis Patients—An Observational Study in a Cohort of Portuguese Patients

by Gergana Novakova, Presian Bonev, Mary Duro, Rui Azevedo, Cristina Couto, Edgar Pinto and Agostinho Almeida

Toxics 2023, 11(3), 247; https://doi.org/10.3390/toxics11030247 - 06 Mar 2023

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Abstract

Background: Patients on chronic hemodialysis therapy are at high risk of disturbances in trace element status due to both the underlying disease and the hemodialysis process itself. Data on iodine and bromine levels in these patients are scarce. Methods: Using an [...] Read more.

Background: Patients on chronic hemodialysis therapy are at high risk of disturbances in trace element status due to both the underlying disease and the hemodialysis process itself. Data on iodine and bromine levels in these patients are scarce. Methods: Using an ICP-MS analytical procedure, serum iodine and bromine levels were determined in a cohort (n = 57) of end-stage renal disease patients on chronic hemodialysis. The results were compared with those of a control group (n = 59). Results: Hemodialysis patients presented serum iodine levels within the normal range, slightly lower than in controls, but without reaching a statistically significant difference (67.6 ± 17.1 µg/L vs. 72.2 ± 14.8 µg/L; p = 0.1252). In contrast, serum bromine levels were much lower in patients (1086 ± 244 µg/L vs. 4137 ± 770 µg/L; p < 0.0001), at values only about 26% of the values observed in controls. Conclusions: Hemodialysis patients had normal serum iodine levels, but highly decreased serum bromine levels. The clinical significance of this finding requires further investigation, but it may be associated with sleep disturbances and fatigue that affect hemodialysis patients. Full article

(This article belongs to the Topic Advances in Chemistry, XXVIth International Galician Portuguese Conference on Chemistry)

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Supplementary File 1 (ZIP, 501 KiB)

13 pages, 1578 KiB  

Open AccessArticle

Iron Determination in Natural Waters Using a Synthesised 3-Hydroxy-4-Pyridione Ligand in a Newly Developed Microfluidic Paper-Based Device

by Juliana I. S. Aguiar, Susana O. Ribeiro, Andreia Leite, Maria Rangel, António O. S. S. Rangel and Raquel B. R. Mesquita

Chemosensors 2023, 11(2), 101; https://doi.org/10.3390/chemosensors11020101 - 01 Feb 2023

Cited by 4 | Viewed by 1480

Abstract

This work describes the development of an iron sensor based on a microfluidic paper-based technique, to attain iron quantification in natural waters. A new water-soluble naphthalene-3-hydroxy-4-pyridione ligand was used as a colour reagent, as it formed an orange complex with iron. As a [...] Read more.

This work describes the development of an iron sensor based on a microfluidic paper-based technique, to attain iron quantification in natural waters. A new water-soluble naphthalene-3-hydroxy-4-pyridione ligand was used as a colour reagent, as it formed an orange complex with iron. As a newly described ligand, several chemical and physical parameters, namely, the sample and reagent volumes and reagent concentrations, were studied related to the formation of the coloured complex. The microfluidic paper-based analytical device (μPAD) assembly, namely, the use of different types of filter paper and different numbers of layers, was developed to obtain the best performance. Under the optimal conditions, a linear correlation was obtained in the range of 0.25–2.00 mg/L of iron, with a minimum detectable value of 0.07 mg/L. The proposed μPAD method was validated by an analysis of the certified samples and by a comparison of the tested water samples with the inductively coupled plasma (ICP) results (RE < 10%). Then, the μPAD device was successfully applied to the determination of iron in tap water, well water, river water, and seawater, with no need for any prior sample pre-treatment; recovery studies were also performed (average = 100.3% with RSD = 4.2%). Full article

(This article belongs to the Topic Advances in Chemistry, XXVIth International Galician Portuguese Conference on Chemistry)

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