INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Tao Sun,Siying Ren,Jian Hu,Jiatao Zhang,Linze Liu,Jiahui Du,Xing Wang,Yuming Deng,Xueyan Yun,Tungalag Dong
Biodegradable PLLA-based cast films were prepared via melt blending poly(L-lactic acid) (PLLA) with poly(L-lactic acid-co-butylene itaconate) (PLBI), poly(L-lactic acid-co-glycolic acid) (PLGA), and poly(L-lactic acid-co-butylene itaconate-co-glycolic acid) (PLBIGA) copolymers to enhance mechanical, barrier, and degradation properties for dairy packaging applications. Copolymers were synthesized using a one-step melt polycondensation method, and the film properties were effectively controlled by adjusting the blending ratios. All blended films exhibited significantly improved toughness while maintaining high transparency. Specifically, PLLA/PLBIGA20 % film demonstrated a 90.1 % reduction in oxygen transmission rate (OTR) and a 54.3 % reduction in water vapor transmission rate (WVTR) compared to pure PLLA, and PLLA/PLBI20 % film reduced ultraviolet (UV) transmittance to 53 % in the 280–320 nm range. The soil degradation rates of blended films were notably higher than pure PLLA, with distinct degradation mechanisms observed for each copolymer; notably, PLLA/PLBIGA20 % film degraded simultaneously in both amorphous and crystalline regions. Blended films met food-contact safety standards and, when applied to commercial yogurt packaging, effectively preserved lactic acid bacteria viability, outperforming pure PLLA film. These findings demonstrate the strong potential of PLLA-based blended films as sustainable packaging solutions for dairy products.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Jiahui Du,Le Du,Jiushi Guo,Tao Sun,Linze Liu,Xueyan Yun,Tungalag Dong
Chilled beef is a perishable food product. Due to the broad-spectrum antimicrobial properties of chitosan, and the biodegradability of PLLA, chitosan and PLLA are introduced double bonding groups to obtain Chitosan- graft -Glycidyl methacrylate (Cs-g-GMA) and Poly(L-lactic acid)- co -poly(butylene itaconate) (PLBI), respectively. Cs-g-GMA is then grafted onto the surface of PLBI films by UV curing to produce PLBI/Cs-g-GMA films with non-migratory, broad-spectrum antimicrobial, biodegradable, and possess good oxygen barrier properties, compared to current antimicrobial films. Antimicrobial tests in vitro confirmed that PLBI/Cs-g-GMA film could effectively inhibit the growth and reproduction of P. fluorescens , S. aureus , and E. coli . The PLBI/Cs-g-GMA films were further used for the packaging of chilled beef during 15 days of refrigerated storage. The microbiological (total viable counts (TVC), microbial diversity analysis), physicochemical (pH, total volatile basic nitrogen (TVB-N), drip loss, color) and sensory of beef were measured to evaluate the preservation effect. The results showed that PLBI/Cs-g-GMA films can significantly inhibit Pseudomonas and Aeromonas at the phylum and genus levels, respectively. Based on the good results of the preservation index, PLBI/Cs-g-GMA film could delay the quality deterioration of chilled beef by 3 to 9 days, suggesting that its considerable prospects for maintaining the storage quality of chilled beef.
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PubMed
高影响因子
Materials
·
2025
·Vol. 18
·期 6
·1314
·
IF 3.2
Xi Yuan,Shiyu Fu,Hao Liu
The current widespread use of plastics is a significant source of environmental pollution and increases the carbon load in the atmosphere, which has precipitated an urgent drive to replace plastics with biomass-based materials. In this paper, we prepared a lignocellulose-based, high-strength, water-resistant composite based on eucalyptus waste sawdust combined with a polyurethane prepolymer. The preparation process included pretreating sawdust with deep eutectic solvents (DESs) to remove some of the lignin and hemicellulose. A prepolymer preparation involving isocyanate groups using the prepolymerization of polyethylene glycol (PEG) with hexamethylene diisocyanate (HDI) grafted the prepolymers to the hydroxyl of the pretreated wood fibers, which were subsequently blended with acetylated pretreated sawdust to create the composite. The composite contained 67% wood fibers, possessed good tensile strength, and exhibited Young’s moduli of 18 MPa and 484 MPa. It was water-resistant with a contact angle of 92° and had a low water absorption of 32%, and it maintained a wet tensile strength of 5.71 MPa. The composite offers several advantages, including UV protection and thermal stability. This high-performance wood waste composite provides an alternative green production option for producing plastic materials.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Lingtun Hao,Maofeng Ding,Song Song,Yong You,Xingang Li
Photocatalytic amino acid synthesis from biomass is a promising and renewable method, yet the synthesis efficiency remains suboptimal. Here, we report a novel strategy for synthesizing 2D/2D CdS/1T-MoS 2 heterojunctions by leveraging 1T-phase MoS 2 with distorted octahedral coordination and sulfur-rich edges to promote the formation of large contact areas and abundant interfacial sulfur vacancies in combination with CdS. CdS/1T-MoS 2 displays exceptional photocatalytic performance for amination of biomass-derived α-hydroxy acids to α-amino acids, achieving an alanine formation rate of 23.3 mmol·g -1 ·h -1 from lactic acid, which is 4.4 and 1.6 times higher than those of CdS and CdS/2H-MoS 2 , respectively. Detailed characterizations reveal that CdS/1T-MoS 2 possesses abundant interfacial sulfur vacancies at the 2D/2D heterojunction interface compared to CdS and CdS/2H-MoS 2 . These vacancies create numerous Lewis acids sites, significantly enhancing the adsorption and activation of hydroxyl groups in lactic acid, thereby promoting the dehydrogenation step. Moreover, CdS/1T-MoS 2 facilitates the condensation of pyruvic acid with ammonia and promotes the desorption of alanine from the catalyst surface, effectively improving the reductive amination step. Additionally, CdS/1T-MoS 2 exhibits superior charge carrier separation and migration efficiency, further boosting its photocatalytic amination activity. This study provides a novel strategy for synthesizing 2D/2D heterojunctions with abundant interfacial vacancies for efficient photocatalytic biomass valorization.
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高影响因子
危险品化学品经营许可证（带存储）