Carbohydrate Polymer Technologies and Applications最新文献

Bovine mastitis is a global problem and is mainly treated with antimicrobial agents that can significantly affect milk quality and threaten human health. The mammary gland can be damaged by the accumulation of reactive oxygen species (ROS), particularly during the perinatal period. Dihydromyricetin (DHM) has a wide range of pharmacological activities and is considered safe. However, its poor solubility, absorption, and bioavailability have limited its application. To address this issue, we designed and synthesized new chitosan-derivative nanoparticles (HACC-NPs) loaded with DHM, which have the potential to overcome its bioabsorption problems and enhance its antibacterial and antioxidant effects. We used the emulsification/crosslinking method to load DHM into chitosan-derivative nanoparticles (DHM/HACC-NPs); then, SEM, TEM and FTIR analyses were used to show a denser, more tightly packed matrix for the DHM/HACC-NPs, which were successfully prepared. The size (176.4 nm), polydispersity index (PDI, 0.21), and absolute value of the zeta potential (+26.3 mV) confirmed the stability of the DHM/HACC-NPs. More importantly, DHM/HACC-NPs had a stronger antibacterial effect on S. aureus (MIC = 0.52 mg/mL and MBC = 1.02 mg/mL) than on E. coli (MIC = 1.02 mg/mL and MBC = 2.05 mg/mL). Notably, DHM/HACC-NPs were concentration-dependent scavengers of DPPH and hydroxyl radicals. In summary, DHM/HACC-NPs exhibited superior biocompatibility and antimicrobial and antioxidant activities, offering new insights into the development of a robust, udder-stable drug platform as a promising strategy for treating dairy cow mastitis.

The objective of the current study was to explore the antifungal potential of celery seed essential oil (CSEO) in a nano-carrier system against Podosphaera fusca, the causal agent of cucumber powdery mildew. We assessed the physicochemical characterization of CSEO-loaded chitosan nanoparticles (CSEO-LCNPs) using dynamic light scattering, field emission scanning electron microscopy, and Fourier transform infrared spectroscopy. The successful loading of various concentrations of CSEO into chitosan nanoparticles (1:0, 1:0.25, 1:0.5, 1:0.75, and 1:1) has been verified. The particles exhibited a spherical shape, with an average diameter of 113 nm, and a negatively charged surface with a zeta potential of -31.5 mV. The Korsmeyer-Peppas model well described the release behavior of CSEO from nanoparticles. Additionally, we examined the defense mechanism, as well as biochemical/molecular responses following foliar treatment with CSEO-LCNPs. In vivo, results revealed that CSEO-LCNPs foliar application on the cucumber seedlings inoculated with P. fusca significantly reduced the disease severity of powdery mildew. Treatment with CSEO-LCNPs led to an increase in phenolic and flavonoid compounds, chlorophyll concentration, enzyme activities, and gene transcriptions in inoculated cucumber seedlings. In our study, we observed a positive correlation between antioxidant compounds and the defense-associated enzymes as well as their corresponding gene expressions. Our study underscores the potential of CSEO-LCNPs as an eco-friendly and effective solution for managing cucumber powdery mildew.

Effective utilization of waste kitchen oil (WKO) is important to environmental protection and economic development. Presently, an endophytic fungus Chaetomium globosum CGMCC 6882 polysaccharide (CGP-WKO) was successfully produced through submerged fermentation with the sole carbon source of WKO. CGP-WKO had a yield of 1.53 ± 0.27 g/L and contained 95.85 % ± 3.02 % carbohydrate and 2.94 % ± 0.62 % protein. Structural feature analysis indicated that CGP-WKO contained glucose, glucosamine, mannose, rhamnose, galactose, fructose, and glucuronic acid in a molar ratio of 30.38: 1.34: 32.22: 9.68: 1.59: 0.62: 3.73. The weight-averaged molecular weight of CGP-WKO was 26.64 kDa, and its polydispersity was 1.48. Moreover, antioxidant capacity detection in vitro demonstrated that when the concentration of CGP-WKO was 1.0 mg/mL, its scavenging effects against 1,1-diphenyl-2-picrylhydrazyl; 2,2′-azinobis-di-(3-ethyl-benzothiazolin-6-sulfonic acid) diammonium salt; and hydroxyl and superoxide radicals were 45.89 % ± 1.89 %, 55.89 % ± 1.12 %, 29.02 % ± 2.61 %, and 52.76 % ± 2.12 %, respectively; and the IC₅₀ values were 6.4612, 0.8888, 13.8585, and 0.9398 mg/mL, respectively. CGP-WKO increased the content of superoxide dismutase, catalase, and glutathione peroxidase and reduced malondialdehyde content in H₂O₂-challenged HepG2 cells. Overall, the present work indicated that CGP-WKO can be used as an antioxidant agent in the food, cosmetics, and pharmaceutical industries.

This study aims to determine the effect of nanoparticles (NPs), namely graphene oxide (GO), multilayer carbon tubes (MWCNTs + Fe), magnetite (Fe₃O₄) and in situ forming brushite (DCPD) in chitosan (CS) based matrices on the cytotoxicity, Pregabalin (PG) release, and in vivo behavior of mechanically stabilized conductive nerve conduits (NCs). NPs change the composites’ hydrophilicity in the order: DCPD (46.8) < MWCNT (54.21) ∼ Fe₃O₄ (54.44) < GO (65.99) and the water contact angle (47–66°) corresponds to the conditions of cell adhesion. NPs of ≤ 150 μg/ml reduce cell adhesion but don't trigger oxidative stress and toxic effects. Magnetite NPs of 300 µg/ml promote apoptosis in nerve cells. The introduction of PG at stage b during the DCPD formation provides the drug release kinetics closest to the zero-order kinetic model. The most electrically conductive GO- and MWCNTs + Fe - containing NCs have a prolonged biodegradation period of about 6 months, which makes them promising for the regeneration of damaged peripheral nerves in humans.

Functional polysaccharides are characterized by functional and structural biomolecules, which play a dual role, both as nutrient molecules providing energy and as signaling molecules involved in intercellular communications. There are increasing evidences showing that functional polysaccharides possess beneficial effects for treating chronic diseases, such as cancer, cardiovascular disease, etc., but its mechanism of action remains imprecision. Additionally, due to the limitations of precision detection methods and the complexity of their structures, the metabolic kinetics behaviours or bioavailability of functional polysaccharides, and the interaction between it entering the systemic circulation and target cells of action have been a conundrum faced by researcher. This review summarized the latest advances in the efficacy of functional polysaccharides in chronic diseases and their structure-activity relationship, absorption and metabolic behaviours, and specific cellular receptors so as to understand the mechanisms of their bioactivities. This review is expected to provide new insights of functional polysaccharides and paves the way for their application.

Although several fundamental applications have been reported for yeast cells and their components as functional vehicles or promising structural ingredients in encapsulation of bioactive compounds; meanwhile, potential applications of encapsulated yeasts (EYs) have been less reviewed. Recently, EYs have received increasing attention for industrial applications in different areas of biotechnology such as bioremediation of toxins or heavy metals, bio-filtration, and biocatalyst or bioethanol production. Yeast cells are mostly encapsulated within alginate, chitosan, and some other polysaccharide-based coating materials. These platforms enable us to enhance survivability of probiotic yeasts in food, feed and gastrointestinal transit, as well as to improve their mucoadhesion and targeted delivery. Furthermore, increased thermo-tolerance and stability of yeasts towards high concentrations of alcohols, as well as their improved yield during industrial processing of different fermented foods have been revealed using encapsulation strategies. These cost-effective and scalable matrices have also several innovative potentials to construct composite of living cells and engineered polymers or cell-in-shell hybrids in order to modify techno-functional and sensory properties of the product, as well as cell immobilization, cell-surface engineering and programmed intelligent coating formation and/or degradation.

Wound care poses a significant global challenge, imposing substantial financial strain on governments across the globe. The exploration of wound dressings (WDs) with the potential to enhance the healing process has been the subject of extensive research and scrutiny for an extended period. Traditional wound dressings, such as bandages, hydrogels, and foams, fall short of achieving desired wound healing (WH) outcomes due to their limited ability to accurately address the dynamic process of tissue repair. There have been suggestions to create sophisticated WDs with the capability to interact with wounds, perceive alterations in the wound's state or surroundings, and react correspondingly. This proposal encompasses the development of advanced WDs that possess interactive features for improved monitoring and response to changes in wound conditions. These innovative dressings incorporate sensors and intelligent materials such as stimuli-responsive and self-healing materials, aiming to effectively enhance the process of WH. In recent years, there has been significant advancement in the field of WDs, with the introduction of innovative smart WDs. These cutting-edge dressings include biomechanical WDs, stimuli-responsive WDs, self-healing WDs for mobile injuries, self-removable WDs, and monitoring WDs. This progressive development in wound care technology showcases the potential to revolutionize the management and treatment of various types of wounds. This review aims to provide an overview of dressings with chitosan nanoparticles (CS NPs) that exhibit responsiveness to stimuli. The article discusses various aspects of these dressings, focusing on their characteristics and applications in a scientific and scholarly manner.

Fatty acid esters being biodegradable and environment friendly has been a sought-after class of molecule for various food grade applications. This work involves the incorporation of fatty acid esters namely cetyl-caprylate and cetyl-caprate in edible Carboxymethyl cellulose -based films. The esters were enzymatically synthesized by esterification of caprylic acid and capric acid respectively with cetyl alcohol at a molar ratio of 1:1, using Candida antarctica lipase B which was immobilized (10 % w/w) at 65 °C. Carboxymethyl cellulose films were prepared. To it, glycerol and by emulsification, cetyl-caprylate or cetyl-caprate esters were amalgamated. Film characterizations involved analysis of surface morphology, mechanical properties, and thermal properties. It was further characterized by X-Ray diffraction analysis, water vapor permeability, and moisture uptake. Barrier property carboxymethyl cellulose films showed significant improvement due to the incorporation of cetyl-caprylate or cetyl-caprate esters. However, when the film's melting point was measured, it was seen that glycerol influenced the thermal properties more prominently than cetyl-caprylate and cetyl-caprate esters. Thus, the addition of an optimized amount of glycerol and cetyl-caprylate or cetyl-caprate esters to the carboxymethyl cellulose films is required for improved mechanical strength and better thermal properties. Further, an antimicrobial well diffusion assay of both the esters established the antimicrobial property of the same, which thereby recommends the addition of the wax esters even more.

Ethylenediaminetetraacetic acid (EDTA) is a well-known metal chelator and an attractive ligand for covalently modifying adsorbents for bioremediation. Cellulose, a naturally occurring biopolymer, has immense potential as an inexpensive, earth abundant, biocompatible scaffold for EDTA-facilitated environmental remediation; however, pretreatment of the material is required to achieve sufficient degrees of chemical modification. In this study, Natural Fiber Welding (NFW) is used to prepare commercial cotton Aida cloth for EDTA functionalization. Following NFW, the cotton scaffold was covalently modified with up to 0.56 mmol of EDTA per gram of adsorbent, a nearly 2.5-fold increase over native material. The welded EDTA-modified substrates were tested qualitatively against cobalt and quantitatively against nickel, reaching equilibrium binding capacities (q_e) of up to 46 mg metal per g of adsorbent, on par with capacities reported from past work on EDTA-modified cellulose. In addition, adsorbent material could be regenerated using mild acid treatment with no significant loss in q_e. Unlike the controls, the fiber-welded EDTA-Aida did not fray even after 3 chelation cycles, indicating enhanced textile robustness afforded through NFW treatment. Overall, NFW offers a new approach to converting commercially available, sustainable biomaterials into robust adsorbents for environmental remediation.