CARBOHYDRATE POLYMERS
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2024
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IF 10.7
Nian Xiang,Yuming Lin,Zuzeng Qin,Tongming Su,Xinling Xie,Hongbing Ji
Polysaccharides-based smart fertilizers are essential for promoting plant growth, yet significant challenges exist in achieving stable structures and synchronizing nutrient release and plant growth. This study developed a temperature-responsive gating chitosan-based microcapsule (CTSMC-g-PNIPAM) by grafting N-isopropyl acrylamide (NIPAM) onto chitosan microcapsules (CTSMC) via atom transfer radical polymerization (ATRP). The interfacial crosslinking of chitosan (CTS) and terephthalendehyde (TPA) formed the CTSMC matrix with a hollow chamber structure and ensured stability. CTSMC-g-PNIPAM exhibited reversible temperature-responsive gating properties and sustained release behavior, and the PNIPAM chains acted like gating switches. Below the low critical solution temperature (LCST) (25 °C), the PNIPAM chains stretched and the gating switch closed, slowing down the release rate. Above the LCST (40 °C), the PNIPAM chains contracted and the gating switch opened, accelerating the release rate. The release behaviors of CTSMC-g-PNIPAM in soil indicated that the gating microcapsule effectively prolonged the release of urea. Moreover, the cumulative release of CTSMC-g-PNIPAM at 40 °C was significantly higher than at 25 °C. The first-order kinetic and Korsmeyer-Peppas model indicate that the urea release involves concentration gradient diffusion and skeleton dissolution. Compared with pure urea, urea@(CTSMC-g-PNIPAM) increased the growth status of maize, suggesting a promising strategy for smart fertilizers.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Hui Wang,Chen Chen,Kun Dai,Houle Xiang,Jingwei Kou,Han Guo,Hanjie Ying,Xiaochun Chen,Jinglan Wu
Dyes pollution is well known for their hazardous impacts on human health and the environment. The removal of dyes from wastewater has become an important issue. In this study, magnetic micrometer-sized particles AL-CTS@MNPs were synthesized from alkaline lignin (AL) and chitosan (CTS) by “one-pot method”. The adsorbent presented higher selectivity adsorption effect on anionic dyes than amphoteric and cationic dyes, and even no adsorption effect on cationic methylene blue (MB), which showed that the anionic dyes could be better separated from the other two types of dyes. The adsorption isotherms of the dyes were highly consistent with the Langmuir model, and the maximum adsorption capacity was 329.50 mg/g for methyl orange (MO) and 20.00 mg/g for rhodamine B (RhB). AL-CTS@MNPs showed good adsorption of anionic dyes (MO) in the pH range of 3–9. Meanwhile, the adsorbent AL-CTS@MNPs were also characterized, showing rough surface with specific surface areas of 37.38 m 2 /g, pore diameter of 95.8 nm and porosity of 17.62 %. The particle sizes were ranged from 800 μm to 1300 μm. The electrostatic attraction and π-π* electron donor-acceptor interactions were the main forces between the adsorbent and anionic dyes. While the electrostatic repulsive force between the adsorbent and the cationic dyes resulted in the non-absorption of MB by AL-CTS@MNPs. Subsequently, the adsorbent maintained a removal rate of >95 % after five adsorption-desorption cycles, demonstrating its excellent stability and recoverability. Ultimately, the prepared AL-CTS@MNPs illuminated good prospect on complex components dyes wastewater treatment.
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MINERALS ENGINEERING
·
2024
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IF 4.9
Longxia Jiang,Bo Feng,Tao Wang,Ziming Wang
Fluorite and barite share similar physicochemical properties, making them challenging to separate efficiently using flotation. To address this problem, sodium oleate (NaOL) was used as a collector to study the separation effect of carboxylated chitosan (CCS) as a depressant for fluorite and barite. Infrared Spectroscopy (FTIR) test, X-ray photoelectron spectroscopy (XPS), Zeta potential test, contact angle test and adsorption test were investigate the selective depression mechanism of CCS. The test results showed that CCS, acting as the depressant, effectively depressed fluorite and separated fluorite and barite. According to mechanistic analysis, CCS developed stable chemisorption by bonding the carboxyl group (–COOH) in its molecule and the calcium sites of fluorite. In contrast, CCS adsorption on barite was a hydrogen bonding interaction, making CCS easily fall off the barite surface. As a result, NaOL can be stably adsorbed on the barite surface, whereas CCS present on the fluorite surface consumes a high number of Ca sites and reduces Ca sites available for NaOL adsorption, resulting in distinct hydrophobicity and floatability differences between fluorite and barite. Consequently, barite and fluorite were successfully separated.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2024
·
IF 5.7
Jing Liu,Hao Chen,Yan Lv,Huixiang Wu,Li-jun Yang,Jiahui Zhang,Jianying Huang,Wenjie Wang
Aspergillus flavus contamination in agriculture and food industries poses threats to human health, leading to a requirement of a safe and effective method to control fungal contamination. Chitosan-based nitrogen-containing derivatives have attracted much attention due to their safety and enhanced antimicrobial applications. Herein, a new benzimidazole-grafted chitosan (BAC) was synthesized by linking the chitosan (CS) with a simple benzimidazole compound, 2-benzimidazolepropionic acid (BA). The characterization of BAC was confirmed by Fourier transform infrared (FTIR) spectroscopy and nuclear magnetic resonance spectroscopy (1H and 13C NMR). Then, the efficiency of BAC against A. flavus ACCC 32656 was investigated in terms of spore germination, mycelial growth, and aflatoxin production. BAC showed a much better antifungal effect than CS and BA. The minimum inhibitory concentration (MIC) value was 1.25 mg/mL for BAC, while the highest solubility of CS (16.0 mg/mL) or BA (4.0 mg/mL) could not completely inhibit the growth of A. flavus. Furthermore, results showed that BAC inhibited spore germination and elongation by affecting ergosterol biosynthesis and the cell membrane integrity, leading to the permeabilization of the plasma membrane and leakage of intracellular content. The production of aflatoxin was also inhibited when treated with BAC. These findings indicate that benzimidazole-derived natural CS has the potential to be used as an ideal antifungal agent for food preservation.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Yan Li,Hang Lei,Qingfeng He,Sisi Tang,Yuxia Zhong,Yue-Fei Zhang
The escalating global energy demand has intensified the reliance on nuclear power generation, necessitating advanced solutions for radioactive iodine sequestration from nuclear wastewater. Chitosan (CS) exhibits significant potential for radioactive iodine capture due to the ion-exchange capabilities of its amino and hydroxyl functional groups with iodide ions. Herein, a novel A/CS-PEI composite hydrogel was synthesized through crosslinking chitosan with acrolein and polyethyleneimine (PEI) for enhanced iodine adsorption. The effect of temperature, contact time, and initial concentration on the adsorption of iodine was studied. The results demonstrate that the adsorption capacity of the adsorbent for I 2 can achieve as high as 840.91 mg∙g −1 . Additionally, molecular dynamics simulations demonstrated that the maximum absolute adsorption energy of −214.50 kcal/mol was achieved at 318 K, an increase in temperature enhances the adsorption capacity to a certain extent. Also van der Waals interactions dominate the non-bonded energy components with a value of −197.99 kcal/mol. The adsorption mechanism can be explained by hydrogen bond, van der Waals force, electrostatic force and charge transfer interaction. This work establishes a fundamental framework for designing multifunctional hydrogels with tailored functionalities for nuclear waste remediation.
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CHEMICAL ENGINEERING SCIENCE
·
2025
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IF 4.3
Xiudie Wang,Wei Liu,Ziyu Qin,Pengfei Han,Ying You,Xueqiong Yin,Jianming Pan
To develop an adsorbent that not only efficiently adsorbs uranium ions but also withstands microbial deterioration in the environment, we fabricated an antibacterial hydrogel from chitosan, named ITDC, which boasts the advantages of antibacterial properties, thermal sensitivity, and ion-imprinting characteristics. ITDC was synthesized via a one-pot ion-imprinting copolymerization process, utilizing dimethyldiallylammonium chloride as the antimicrobial monomer and N-isopropylacrylamide as the thermosensitive monomer. ITDC demonstrated an antibacterial efficacy of 99.20 % against E. coli . An adsorption capacity of 90.93 mg/g was attained under the optimized conditions. ITDC exhibited remarkable reusability and superior adsorption selectivity compared to its non-imprinted counterpart NTDC. The high correlation with the Langmuir isotherm and pseudo-second-order model underscored the predominant role of chemical adsorption in ITDC. ΔH θ (64.56 kJ/mol) and ΔS θ (257.38J/mol·K) than NTDC (ΔH θ 18.97kJ/mol, ΔS θ (117.04J/mol·K) indicated that ITDC was more thermally sensitive than NTDC, attributed to its ion-imprinting structure.
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CARBOHYDRATE RESEARCH
·
2025
·
IF 2.5
Li Ma,Liyuan Lu,Xiaoliang Zhao,Qingsong Zhou,Li Luo,Doudou Ma,Wenya Wang,Weijie Zhang
Hydrogel dressings have attracted considerable attention as essential tools for the treatment of skin wounds. In this study, a physically and chemically double cross-linked self-healing hydrogel (HPOCFe) was developed to promote skin wound healing. Through the dual network hydrogel strategy, the hydrogel not only overcomes the slow formation and recombination of covalent bonds in the chemical crosslinking network, but also overcomes the poor mechanical properties of the physical crosslinking network. The excellent properties of each cross-linking network were preserved, while the self-healing property of the hydrogel was synergistically enhanced. Pyrocatechin (PCA) was grafted onto quaternary chitosan (HACC) to obtain HACC-PCA. Subsequently, oxidized Cirsiumsetosum polysaccharide (OCSP) and FeCl 3 were added to the HACC-PCA solution to prepare HPOCFe hydrogel.The structural and functional properties of the hydrogel were investigated, including morphology, mechanical strength, swelling and degradation behaviour, haemostatic properties, cytotoxicity, antimicrobial activity and wound healing efficacy. The HPOCFe hydrogel exhibited good tissue adhesion, improved compressive strength, excellent self-healing ability, rapid haemostatic ability, low cytotoxicity, promotion of cell migration and strong antimicrobial activity. Importantly, the HPOCFe hydrogel significantly promoted epithelial regeneration, granulation tissue formation, collagen deposition and orientation, angiogenesis and wound contraction in wound healing. In conclusion, the HPOCFe hydrogel can promote wound healing and has broad application prospects as a scaffold in regenerative medicine.
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ANALYST
·
2025
·
IF 3.3
junbin cao,chengcheng xu,Jianwei Zhao,wenmei tao
This research created a disposable electrochemical sensor utilizing a chitosan-biochar (CS-H500) composite-modified glassy carbon electrode (GCE) for the very sensitive detection of brilliant blue (BB) in food products. The CS-H500 composite dispersion was synthesized using the ultrasonic dispersion method, while quantum chemical simulations clarified the adsorption mechanism of BB molecules on the electrode surface via π-π conjugation and electrostatic interactions. Optimized experimental settings comprised: 16 μL of CS-H500 dispersion modification, 300 seconds of accumulation period, and a pH 7.0 phosphate buffer. The results indicated that chitosan (CS) markedly enhanced the dispersibility of biochar, augmenting the effective surface area of the modified electrode by 2.53 times (0.179 cm2) in comparison to the bare GCE. The sensor demonstrated a linear detection range of 1.0×10-6 to 1.0×10-4 mol/L for BB, with a detection limit of 1.0×10-7 mol/L (S/N=3), acceptable recoveries (91.49%-102.18%), and commendable reproducibility (RSD=8.01%). Interference studies validated significant selectivity against citric acid, glucose, prevalent metal ions, and proficient differentiation from mixed pigments such as sunset yellow (SY) and fluorescein sodium (FS). The analysis of practical beverage samples confirmed its reliability. This disposable electrode design streamlines operations, prevents cross-contamination, and offers an effective option for on-site monitoring of food additives.
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FOOD RESEARCH INTERNATIONAL
·
2025
·
IF 8
Mengyuan Cao,Chengkui Qiao,Lijun Han,Ming Zhuang,Shiyu Wang,Rongli Pang,Linlin Guo,Mingqin Yang,Momo Gui
Chitosan (CTS) is a natural polysaccharide derived from the deacetylation of chitin. Chitosan-based coatings are widely used for the preservation of hardy kiwifruits. However, the effect of chitosan-based coating on fruit flavor during ripening is rarely reported. In this study, the postharvest qualities of hardy kiwifruits were investigated using chitosan coating and chitosan-silica nanoparticle coating (CTS-SiNPs) during storage at 25°C and 4°C. Physicochemical analyses showed that chitosan coating extended the shelf-life by delaying ripening and maintaining higher quality than uncoated fruits, and CTS-SiNPs treatment showed a superior preservation effect compared to CTS treatment. Untargeted metabolomics analysis based on HS-SPME-GC–MS was used to comprehensively evaluate the volatile profiles of hardy kiwifruits during postharvest storage. The metabolomics analysis showed that two chitosan coating treatments greatly delayed the accumulation of most volatiles while delaying the ripening process, and the differential volatiles were mostly involved in the terpenoids biosynthesis pathway. Notably, most green leaf volatiles (C 6 /C 9 aldehydes, esters and alcohols) and methyl salicylate were up-regulated in the CTS-SiNPs coating groups. In addition, odor activity value (OAV) was used to characterize the key aroma-active compounds and odor profiles. A total of 32 compounds were identified as key aroma-active compounds (OAV ≥ 1) in hardy kiwifruits. The odor profile evaluation showed that the CTS-SiNPs coating treatment enhanced the intensity of the “herbal” odor, while reducing the intensity of “sweet” and “floral” odors in hardy kiwifruits at the eating-ripe stage.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Hong Zhang,Bo Wang,Xu Zeng,Xin Zhang,Bo Ren,Xiaodong Yang
In view of the increasingly severe environmental hazards posed by traditional plastic packaging materials, this study develops a biodegradable chitosan (CS) film to address deficiencies in water solubility and mechanical properties, thereby promoting its wide application in the field of food packaging. A novel antioxidant, antibacterial, and biodegradable food packaging film was synthesized using natural bentonite (Bt) and gallic acid (GA) - mediated silver nanoparticles (AgNPs). This is the first study to integrate Bt, GA, and in-situ-synthesized AgNPs into chitosan films for synergistic antioxidant/antibacterial enhancement. Specifically, chitosan was modified with gallic acid, which significantly improved the water solubility of chitosan. Subsequently, GA reduces Ag + in situ to form AgNPs using the modified chitosan. SEM analysis indicated that the diameter of the synthesized AgNPs ranged from 30 to 100 nm. By means of the solution casting method, the modified chitosan was compounded with AgNPs and Bt. CSGA/Bt/AgNPs film exhibited excellent water vapor and ultraviolet (UV) barrier properties. In terms of mechanical properties, the strength of the pure CS film was 17.28 MPa, while that of the CSGA/Bt/AgNPs film reached 18.56 MPa, indicating a good interaction among CS, GA, Bt, and AgNPs. Experimental results demonstrated that the film had significant antibacterial activity against S. aureus and E. coli , demonstrating great application potential in the field of food packaging.
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PROCESS BIOCHEMISTRY
·
2025
·
IF 4
Yuxuan Zhao,Ye Li,Wenting Fei,Hao Liang
In recent years, nanomaterials have emerged as prominent carriers in biomedical applications. This trend aims to address limitations inherent in traditional enzyme immobilization methods and reduce the costs associated with enzyme biocatalysts in industrial processes. In this study, we selected non-toxic magnetic nanoparticles (MNPs), distinguished by their exceptional biocompatibility, as immobilization carriers to overcome the inherent instability and non-reusability of free enzymes. The MNPs were coated with chitosan to form a protective layer, thereby significantly enhancing enzyme stability. This approach also circumvented the need for precipitants, thereby avoiding the associated damage observed in conventional cross-linking. Building upon this foundation, glucosidase and rhamnosidase were immobilized onto these modified MNPs for converting Epimedin C into Icaritin. Compared to conventional cross-linked enzyme aggregation techniques, this system exhibited superior catalytic efficiency. Furthermore, the immobilized enzyme system enables rapid magnetic separation of the reaction product. Notably, the immobilized enzymes retained approximately 70 % of their initial activity after eight reuse cycles, demonstrating significant potential for industrial-scale applications. These findings demonstrate the potential of chitosan-modified magnetic nanoparticles as efficient, reusable enzyme carriers for sustainable biocatalytic processes in pharmaceutical and industrial applications.
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Foods
·
2025
·Vol. 14
·期 9
·1563
·
IF 5.1
Xiumei Wang,Yibin Chen,Xiaoxu Zhao,Jie Pang
The effects of stearic acid (SA) and lauric acid (LA) with different concentrations on the structure and physicochemical properties of konjac glucomannan (KGM)/chitosan (CTS)/Zein (KCZ) film were systematically investigated in this paper. The rheology results suggested that the apparent viscosity of the KCZ film solution was significantly enhanced after adding fatty acids (FAs), and all the film-forming solutions were typical non-Newtonian pseudoplastic fluids. Hydrogen bond interactions were formed among KGM, CTS, Zein, and FA molecules. KCZ-FA films had higher crystallinities than KCZ film, and their crystallinities increased with the increase in FA concentrations. Microstructure indicated that adding FAs significantly affected the surface morphologies and roughness of KCZ film. KCZ-LA films exhibited much rougher surfaces than KCZ-SA films when FA concentrations were the same. Moreover, the incorporation of FAs significantly (p< 0.05) decreased the transmittance of KCZ film. KCZ-FA films exhibited higher hydrophobicities and water vapor barrier properties than KCZ film due to their significantly (p< 0.05) higher water contact angle, lower water solubility, water content, and vapor permeability values. The thermal stabilities, color attributes, and mechanical properties of KCZ film were also improved after adding appropriate concentrations of FA. Therefore, KCZ-FA films with excellent performances are promising food packaging materials in the future.
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