RSC Advances
·
2014
·Vol. 4
·期 92
·50708-50712
·
IF 3.708
Yunhua Yang,Qingshan Shi,Jin Feng,Xiulin Shu,Jing Feng
Synthesis and activation of nanosized colloidal carbon spheres (CS) for adsorption of a quaternary phosphonium salt as a new antibacterial material is reported. CS (400–500 nm in diameter) were synthesized via simple hydrothermal treatment of glucose solution. The surface of nonporous CS after being activated by steam possessed a high surface area (2325 m2 g−1). The activated CS (ACS) exhibited a high adsorption capacity for the quaternary phosphonium salt (QPS) and have demonstrated excellent antibacterial properties. The QPS on ACS were more stable than the QPS itself, resulting in long-term antibacterial effects. The excellent adsorption performance and reusability of the steam activated CS reported here could represent a new type of low-cost and efficient adsorbent nanomaterial for antibacterial materials.
研究领域:
材料科学
·
微生物学
·
化学工程
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产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2012
·
IF 2.307
Chun Li,Yuan Liu,Qiu-Yuan Zeng,Ning-Jian Ao
Natural rubber was commonly endowed with antimicrobial activity by adding low molecular weight biocidal agents . Herein we report a new antimicrobial rubber prepared by chemical modification. Quaternary phosphonium salt (QPs) groups were covalently immobilized onto the molecular chains of epoxidized natural rubber (ENR) using halogenated acid as an intermediary. The structures of modified rubbers were confirmed while the antimicrobial activity of QP modified ENR was investigated. Results show that the ring-opening ENR and the QP modified ENR are successfully prepared. The proliferation of microorganisms tested can be effectively inhibited by using QP modified ENR. Meanwhile, the modified ENR illustrates better antimicrobial activity toward Gram-negative E. coli than Gram-positive S. aureus . This method can provide potential applications in preparing permanent antimicrobial rubbers.
研究领域:
材料科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Zhongwen Su,Yonggang Peng,Ying Yu,Yujing Zhong,Junyue Zeng,Yikai Chen,Sekar Vijayakumar,Yangfan Mao,Lin Wang,Meihua Xin,Mingchun Li
Chitosan, a renewable resource, is increasingly studied for its food packaging applications. In this study, chitosan (CS) was used as a raw material to synthesize two derivatives—dodecyl chitosan quaternary ammonium salt (DMDBC) and triphenyl chitosan quaternary phosphonium salt (TPPBC). These were combined with polyvinyl alcohol (PVA) to develop a multifunctional food packaging material with enhanced physical, antibacterial, and antioxidant properties. The resulting composite films exhibited excellent homogeneity and biocompatibility. Strong intermolecular hydrogen bonding among DMDBC, TPPBC, and PVA was confirmed, contributing to the amorphous structural characteristics of the films. Among the various formulations, the film containing 6 % tartaric acid (6 % TA-C12) demonstrated the best mechanical strength, water vapor barrier, and oxygen barrier properties. Incorporation of DMDBC and TPPBC endowed the films with remarkable bioactivities, achieving DPPH and superoxide radical scavenging rates of 81.2 % and 35.6 %, respectively, along with inhibition zone diameters of 32.3 mm ( S. aureus ) and 29.5 mm ( E. coli ). Compared to commercial polyethylene (PE) films, the developed films effectively delayed spoilage and extended the shelf life of strawberries by up to nine days. These high-performance composite films hold strong potential as sustainable alternatives to conventional PE packaging materials in the field of fruit preservation.
研究领域:
高分子材料
·
食品科学
·
包装工程
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生物医学工程
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可持续材料
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产品关联
DOI
PubMed
高影响因子
Journal of Chemistry
·
2013
·
IF 0
Yubing Xiong,Feng Bai,Zipeng Cui,Na Guo,Rongmin Wang
Polymer-supported quaternary phosphonium salt (PS-QPS) was explored as effective catalyst for the coupling reaction of carbon dioxide with epoxides. The results indicated that cyclic carbonates with high yields (98.6%) and excellent selectivity (100%) could be prepared at the conditions of 5 MPa CO2, 150°C, and 6 h without the addition of organic solvents or cocatalysts. The effects of various reaction conditions on the catalytic performance were investigated in detail. The catalyst is applicable to a variety of epoxides, producing the corresponding cyclic carbonates in good yields. Furthermore, the catalyst could be recovered easily and reused for five times without loss of catalytic activity obviously. A proposed mechanism for synthesis of cyclic carbonate in the presence of PS-QPS was discussed. The catalyst was characterized by thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and Fourier transform infrared (FT-IR) spectrum. It is believed that PS-QPS is of great potential for CO2 fixation applications due to its unusual advantages, such as easy preparation, high activity and selectivity, stability, low cost, and reusability.
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Xiangmei Ruan,Puwang Li,Chao Wang,Zuyu He,Yunhao Liu,Chuang Zhou,Liqing Du,Shuhui Song,Ziming Yang
Chitosan (CS) is a natural marine polysaccharide with good biocompatibility and biodegradability . But its poor water solubility and antibacterial activity limit its application in fruits preservation. In this study, based on the advantage of quaternary phosphonium salt (QP) and salicylic acid (SA) with good antibacterial activities and different antibacterial mechanisms, a novel antibacterial coating material was synthesized by grafting QP and SA onto CS. With the grafting of SA and QP onto CS, not only the crystallinity of CS molecules decreased and the water solubility improved, but also the antibacterial activity of CS-QP-SA against Escherichia coli and Staphylococcus aureus , and Colletotrichum gloeosporioides (anthracnose) improved by the synergistic effect of QP and SA. After 20 days storage, the mango fruits treated by CS-QP-SA had a weight loss rate of 12.86 %, the fruit decay incidence was 52.00 ± 1.70 %. Hence, the CS-QP-SA films effectively extending the storage time of mango fruits to a certain extent. The results of this study indicated that CS-QP-SA might be a promising preservative for fruits and vegetables.
研究领域:
食品科学
·
材料科学
·
农业科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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