Article
Biochemistry & Molecular Biology
Nusrat Sharmin, Jan Thomas Rosnes, Leena Prabhu, Ulrike Bocker, Morten Sivertsvik
Summary: In this study, chitosan solutions were prepared using different acid concentrations. It was found that citric acid solutions had lower tensile strengths but higher elongation at break values, which increased with an increasing citric acid content. Acid concentrations did not have a significant effect on gelation time, but citric acid solutions showed higher viscosities. The water vapour transmission rates of citric acid-containing samples were lower, and all chitosan solutions suppressed the growth of test strains.
Article
Food Science & Technology
Cecile Miot-Sertier, Margot Paulin, Lucie Dutilh, Patricia Ballestra, Warren Albertin, Isabelle Masneuf-Pomarede, Joana Coulon, Virginie Moine, Amelie Vallet-Courbin, Julie Maupeu, Marguerite Dols-Lafargue
Summary: Chitosan is an active polysaccharide that has been developed for eliminating spoilage yeast in winemaking. The antimicrobial efficiency of chitosan on various wine microorganisms has been investigated, showing that most species are affected to some extent. The study also highlights that the efficiency of chitosan varies depending on wine parameters and stages of winemaking. Chitosan treatment is not suitable for limiting microbial pressure in musts and has limited impact on certain microorganisms such as Saccharomyces cerevisiae and acetic acid bacteria. Different types of chitosan have different antimicrobial properties, with lower molecular weight chitosan being more effective.
INTERNATIONAL JOURNAL OF FOOD MICROBIOLOGY
(2022)
Article
Agriculture, Multidisciplinary
D. T. Q. Carvalho, A. R. F. Lucena, T. V. C. Nascimento, L. M. L. Moura, P. D. R. Marcelino, M. A. A. Queiroz, S. A. Moraes, G. C. Gois, D. R. Menezes
Summary: The study evaluated the fermentation profile, in vitro gas production, and nutritional quality of pornunca silages with different levels of condensed tannin and opening times. Results showed significant interactions between tannin levels and opening times on pH and NH3-N, while tannin levels after 56 days of ensiling led to changes in pH, DM, CP, NDF, and other parameters. Different levels of tannin influenced the fermentation process and nutrient quality of the silages, with notable effects on pH, DM, CP, NDF, and acid detergent fiber.
JOURNAL OF AGRICULTURAL SCIENCE
(2021)
Article
Chemistry, Applied
Xiaoli Liu, Wenying Liao, Wenshui Xia
Summary: This review comprehensively summarizes the research progress of chitosan biological activity mechanism and its modification and application in food preservation strategy. It further introduces the active function strategies of different preservation techniques and the subsequent film forming processes. The future development of chitosan-based bioactive film and the potential application value of chitosan active food packaging are also discussed.
FOOD HYDROCOLLOIDS
(2023)
Article
Biochemistry & Molecular Biology
Veena G. Bhat, Shivayogi S. Narasagoudr, Saraswati P. Masti, Ravindra B. Chougale, Yogesh Shanbhag
Summary: The study successfully prepared CGPH active films with improved stability and mechanical properties by adding HCA. The films exhibited antibacterial properties and acted as a barrier to UV light, making them suitable for food packaging applications.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Chemistry, Applied
Zijuan Yu, Qinbo Jiang, Dawei Yu, Junli Dong, Yanshun Xu, Wenshui Xia
Summary: The addition of nanoparticles loaded with proanthocyanidins enhanced the mechanical strength, antibacterial properties, barrier ability, and antioxidative performance of the chitosan film matrix. It effectively inhibited the growth of bacteria and slowed down the deterioration of food quality.
FOOD HYDROCOLLOIDS
(2022)
Article
Food Science & Technology
Maria Ruiz-Rico, Felix Sancenon, Jose M. Barat
Summary: The limited solubility of chitosan at neutral and alkaline pH values restricts its use as a natural food preservative. However, its covalent immobilisation on inert supports can preserve its antimicrobial properties. Research shows that chitosan immobilisation through covalent urea bonding is the most suitable method, and chitosan-functionalised supports can effectively reduce microbial contamination in apple juice.
LWT-FOOD SCIENCE AND TECHNOLOGY
(2023)
Review
Materials Science, Textiles
Yan Wu, Yuqing Bian, Feng Yang, Jian Gan, Shiying Hu, Jilei Zhang
Summary: The experimental results showed that BPFs treated with chitosan dissolved in citric acid had significantly higher antibacterial rates than those treated with chitosan dissolved in acetic acid, without any acidic smell. This suggests that chitosan dissolved in citric acid can be a good alternative to acetic acid for improving the antibacterial properties of BPFs.
JOURNAL OF ENGINEERED FIBERS AND FABRICS
(2021)
Article
Food Science & Technology
Jiayi Wang, Yue Lei, Yougui Yu, Lebin Yin, Yangyang Zhang
Summary: This study demonstrates that a mixture of lactic acid and acetic acid can achieve similar inhibitory effects on Escherichia coli O157:H7 while reducing costs. Proteomics analysis and cell membrane permeability experiments reveal distinct mechanisms of action between 1% lactic acid and 0.8% lactic acid + 0.2% acetic acid, providing a theoretical basis for using acid mixtures for produce decontamination.
Review
Biochemistry & Molecular Biology
Qi Zhou, Weiqing Lan, Jing Xie
Summary: This review provides an in-depth understanding of the structure and biological activity of chitosan and phenolic acid, as well as various synthetic techniques employed in their modification. Phenolic acid-chitosan derivatives exhibit improved physicochemical properties and enhanced antibacterial and antioxidant activities, making them promising for food preservation.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2024)
Article
Biotechnology & Applied Microbiology
Weijie Guan, Yuanyuan Ren, Xinxin Ma, Shuang Zhang, Pan Zhao, Ming Gao, Qunhui Wang, Chuanfu Wu
Summary: The study found that anaerobic preservation is more effective in inhibiting the growth of bacteria in food waste and promoting subsequent methane fermentation. Lactic acid and acetic acid play a major role in antibacterial action in anaerobic preservation, with a significant inhibitory effect on bacteria such as Escherichia coli.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Article
Chemistry, Applied
Ziyue Song, Tiancong Ma, Xiujuan Zhi, Bin Du
Summary: The methods to obtain cellulose-chitosan composite films with excellent water-resistance and antibacterial abilities have been widely explored. The occurrence of nonenzymatic browning at 80 degrees C improved the thermal stability and oxygen barrier properties of the membranes, while significantly enhancing their antibacterial capability. Immobilized polycationic chitosan-citric complex in the films retained excellent antibacterial ability and showed potential applications in food packaging with excellent decontamination in meat preservation.
CARBOHYDRATE POLYMERS
(2021)
Article
Food Science & Technology
Bowen Shen, Shengmiao Sun, Liying Zhu, Jianguang Yu, Ling Jiang
Summary: A novel nanocomposite film (Cs/FeS film) for potential food packaging applications was fabricated using chi-tosan (Cs) and Bio-FeS biosynthesized by Deinococcus wulumuqiensis R12. The Cs/FeS film exhibited improved shading performance, better water resistance, as well as high antioxidant capacity compared to pure chitosan films, making it an attractive option for food packaging. The physical properties of the film were further enhanced with the increase of Bio-FeS content.
FOOD PACKAGING AND SHELF LIFE
(2023)
Article
Chemistry, Applied
Jie Liu, Yitong Dong, Xuejing Zheng, Ying Pei, Keyong Tang
Summary: In this study, citric acid was used as a non-toxic crosslinking agent to improve the properties of glycerol-plasticized SSPS films. The CA-crosslinked SSPS films showed enhanced water resistance, mechanical strength, UV-barrier properties, water vapor barrier properties, antioxidant properties, and thermal properties. Additionally, the CA-crosslinked SSPS films exhibited superior antibacterial properties and delayed oxidative deterioration in food packaging application tests.
Review
Food Science & Technology
Alberto Goncalves Evangelista, Gabriela Maia Danielski, Jessica Audrey Feijo Correa, Caroline Maria de Andrade Cavalari, Isabelle Ramos Souza, Fernando Bittencourt Luciano, Renata Ernlund Freitas de Macedo
Summary: Carnobacterium bacteria have shown potential as probiotics and bioprotective agents, particularly in animal production and the food industry. However, research on human health applications is still in the early stages and there is a lack of in vivo studies, limiting its widespread use.
CRITICAL REVIEWS IN FOOD SCIENCE AND NUTRITION
(2023)
Article
Chemistry, Analytical
Catia S. M. Esteves, Elena M. M. de Redrojo, Jose Luis Garcia Manjon, Gabriel Moreno, Filipe E. Antunes, Gemma Montalvo, Fernando E. Ortega-Ojeda
Summary: This study used FTIR-ATR spectroscopy and OPLS-DA method to analyze 64 mushroom samples from different genera, successfully identifying main molecular vibrations and discriminating hallucinogenic mushrooms from other species. The method can serve as an initial screening technique to determine forensic interest of seized mushrooms.
FORENSIC CHEMISTRY
(2022)
Article
Chemistry, Applied
Fernando Teles, Filipe Antunes
Summary: This article summarizes the impact of polymeric materials on the environment and the trend of using biopolymers in the development of bio-based composites. To meet increasingly restrictive fire safety regulations, flame-retardant additives have been used, although high loads of flame retardants may compromise the mechanical properties.
JOURNAL OF VINYL & ADDITIVE TECHNOLOGY
(2023)
Article
Biochemistry & Molecular Biology
Alessandra R. Freitas, Antonio J. Ribeiro, Alessandra B. Ribeiro, Maria Del Mar Collado-Gonzalez, Luis R. Silva, Luis Alves, Elodie Melro, Filipe E. Antunes, Francisco Veiga, Alan I. S. Morais, Roosevelt D. S. Bezerra, Jose L. Soares-Sobrinho, Josy A. Osajima, Edson C. Silva-Filho
Summary: The present work aimed to modify the exuded gum of Sterculia striata tree through an amination reaction. The viscosity and zero potential of the chicha gum varied with pH. The modification was confirmed by various analytical techniques, and the modified gum showed increased mucoadhesive and inhibitory activity against Staphylococcus aureus, as well as antioxidant capacity and inhibitory effect against alpha-glucosidase.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Review
Polymer Science
Catarina Fernandes, Bruno Medronho, Luis Alves, Maria Graca Rasteiro
Summary: Hair is exposed to various external factors that damage its appearance, but hair conditioners can repair and restore its smooth effect. However, some current conditioning agents are harmful to the environment. This paper explores the use of natural-based derivatives as alternative conditioning agents in hair care products.
Article
Chemistry, Physical
Luis Alves, Ana Ramos, Eduardo Ferraz, Pedro Sanguino, Julio Santaren, Maria G. Rasteiro, Jose A. F. Gamelas
Summary: The dispersion state and efficiency of different components in a composite film have a significant impact on its mechanical and optical properties. This study evaluated the effects of different dispersion treatments on the dispersion state of fibrous clay particles in water and the properties of cellulose nanofiber (CNF)-based composite films. The results showed that adding different dispersants improved the dispersion state of mineral crystals, and using ultrasonic treatment for dispersion led to better optical and mechanical properties in composite films.
APPLIED CLAY SCIENCE
(2023)
Article
Biochemistry & Molecular Biology
Elodie Melro, Alexander Riddell, Diana Bernin, Ana M. Rosa da Costa, Artur J. M. Valente, Filipe E. E. Antunes, Anabela Romano, Magnus Norgren, Bruno Medronho
Summary: Levulinic acid was used as a green solvent to selectively extract high-quality lignin from pine wood sawdust. The addition of catalytic concentrations of inorganic acids significantly reduced the extraction temperature and time without compromising the purity of the lignin. This environmentally friendly procedure shows promise in replacing traditional less sustainable methodologies.
Review
Biochemistry & Molecular Biology
Magnus Norgren, Carolina Costa, Luis Alves, Alireza Eivazi, Christina Dahlstrom, Ida Svanedal, Hakan Edlund, Bruno Medronho
Summary: This paper addresses the question of intermolecular interactions in cellulose and challenges the prevailing notion that hydrogen bonding is the predominant factor. The Lindman hypothesis, proposed by Professor Bjorn Lindman, emphasizes the importance of hydrophobic interactions and suggests that cellulose is an amphiphilic polymer. This theory has sparked a reevaluation of cellulose in the scientific community.
Review
Biology
Sara Domingues, Tiago Lima, Maria Jose Saavedra, Gabriela Jorge Da Silva
Summary: Antimicrobial resistance continues to increase globally and treatment of difficult-to-treat infections remains a challenge. The recent approval of cefiderocol has provided an additional treatment option. However, resistant mechanisms have already been identified and reduced susceptibility has developed during patient treatment, highlighting the need for rational use of cefiderocol. This review summarizes current treatments against resistant bacteria and discusses the mechanism of action, therapeutic potential, and reported resistance mechanisms of cefiderocol.
Article
Multidisciplinary Sciences
Sofia Leao, Solange Magalhaes, Luis Alves, Jose A. F. Gamelas, Claudio Lima, Bruno Stein, Maria da Graca Rasteiro
Summary: This study proposes the use of cellulose obtained from sugarcane bagasse as a substitute for polyacrylamide-based anionic flocculants in sugar juice treatment. The cellulose-based flocculants showed good performance in purifying the sucrose compared to the commercial polyacrylamide. Additionally, this is the first time that sugarcane waste has been successfully used in the purification of sugar juice.
Article
Materials Science, Paper & Wood
Luis Alves, Ana Ramos, Eduardo Ferraz, Paulo J. T. Ferreira, Maria G. Rasteiro, Jose A. F. Gamelas
Summary: This study investigates the use of cellulose nanofibers (CNFs) in the production of composite films. Pure CNF films exhibit good mechanical and barrier properties, while the addition of minerals leads to a loss of these properties. Composite films made with TEMPO-oxidized or cationized CNFs show good mechanical, thermal, and barrier properties. Decreasing the pH of the suspensions reduces film preparation time without significantly impacting the properties of the composite films.
Review
Polymer Science
Solange Magalhaes, Catarina Fernandes, Jorge F. S. Pedrosa, Luis Alves, Bruno Medronho, Paulo J. T. Ferreira, Maria da Graca Rasteiro
Summary: Cellulose, the most abundant renewable polymer on Earth, can be obtained from various sources. Traditional fractionation methods involve harsh chemicals, but new sustainable processes have been developed. Cellulose and its derivatives have wide applications, particularly in textiles and packaging, as eco-friendly alternatives to synthetic materials. This review discusses cellulose's properties, green extraction methods, chemical modification, and applications of cellulose derivatives.
Article
Infectious Diseases
Simone Varandas, Conceicao Fernandes, Edna Cabecinha, Sonia Gomes, Gabriela Jorge da Silva, Maria Jose Saavedra
Summary: This study explores the phylogenetic diversity of E. coli isolated from freshwater mussels and identifies associations with host species, geographical location, and human activities. The findings also highlight the effective use of freshwater mussels as indicators for assessing fecal indicators and multidrug-resistant bacteria.
Article
Environmental Sciences
Jorge Tavares, Catia Venancio, Claudia Duarte, Filipe E. Antunes, Isabel Lopes
Summary: The architecture of hydrophobically modified polymers can be tailored to produce variants with different levels of functionality. In this study, the ecotoxicity of six variants of hydrophobically modified poly(acrylic) acids was evaluated for multiple organisms, providing insights for the development of more environmentally friendly materials.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
