FOOD CHEMISTRY
·
2024
·
IF 8.5
Wangkun Lai,Lin Wang,Yu Pang,Meihua Xin,Mingchun Li,Lulu Shi,Yangfan Mao
Chitosan quaternary phosphine salts (NPCS) were synthesized with enhanced antimicrobial properties using a two-step method. Composite films (CNSP) were prepared by incorporating NPCS and polyvinyl alcohol (PVA) as the base material, citric acid as the crosslinker and functional additive, exhibiting antibacterial and UV-blocking properties. The composite film showed a maximum tensile strength of 20.4 MPa, an elongation at break of 677%, and a UV light barrier transmittance of 70%. Application of these composite membranes in preserving strawberries demonstrated effectiveness in maintaining freshness by preventing water loss, inhibiting microbial growth , and extending shelf life. In addition, the composite film demonstrated biosafety. These results indicate that CNSP composite films holds significant promise for safe and sustainable food packaging applications.
研究领域:
食品科学
·
材料科学
·
生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER BULLETIN
·
2014
·Vol. 71
·期 10
·2543-2557
·
IF 1.491
Li Chun,Liu Yuan,Cao Ping,He Jia,Lin Zhongshi,Ao Ningjian,Chu Bin
Herein we endow epoxidized natural rubber with antimicrobial activity by chemical modification. The rubber is firstly ring-opened by bromoacetic acid and then modified by antimicrobial group quaternary phosphonium salt. Using the hydrogen nuclear magnetic resonance spectroscopy ( 1 H NMR) and the ICP atomic emission spectrometry (ICP-AES), the degree of epoxidation, the convert ratio of epoxy groups, and the phosphorus content of the products are measured, and then the effects of reaction time on the structure of products are investigated. The possible reaction mechanism and side reactions in ring-opening procedure are discussed through the comparison of data with different reaction time, and the ring-expansion reaction is supposed to be dominated in the side reactions. The thermal properties of modified rubbers and the structural factors behind are also investigated using differential scanning calorimeter and thermogravimetric analyzer. Antimicrobial activities of modified rubbers with different ring-opening reaction time toward Escherichia coli are studied, and the activity may increase with the content of quaternary phosphonium salt groups. This research may have the benefit for optimizing the structure of chemically modified antimicrobial rubbers.
研究领域:
材料科学
·
化学工程
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Wenzhuang Cui,Yujie Liu,Ying Yue,Jun Wang,Xianhua Meng,Zhizhou Yang,Chu Gong,Jun-Li Yang
The development of novel antibacterial agents is urgently needed to tackle bacterial infection, the major global issue menacing human health. Among them, polymeric quaternary phosphonium salts are worth noticing owing to their strong antibacterial activities and other merits including low bacterial drug resistance. Herein, pullulan modified with quaternary phosphonium salts (PQP) was synthesized using esterification reactions of pullulan and (5-carboxypentyl)triphenylphosphonium bromide (CPTPPB) mediated by N,N′‑carbonyldiimidazole (CDI), and was evaluated as novel antibacterial agents for treating wound infection for the first time. The chemical structures, chemical bonding, elemental compositions, crystalline properties and thermostability of PQP were systematically investigated. PQP exhibited in vitro antibacterial activities against Staphylococcus aureus ( S. aureus ) and Escherichia coli ( E. coli ), which were unveiled by the spread plate method and possibly resulted from the damage of bacterial cell walls/membranes mediated by electrostatic and hydrophobic interactions according to preliminary mechanism studies. Weak cytotoxicity and excellent hemocompatibility of PQP at the effective bactericidal concentration were observed. Moreover, in the infected wound model of mice, PQP was capable of disinfecting the wound and accelerating the healing. We opine PQP in this work is promising for antibacterial applications and will inspire the synthesis of novel antibacterial agents derived from natural polymers.
研究领域:
药学
·
材料科学
·
生物医学工程
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yingpeng Gu,Yue Sun
Nitrate (NO 3 − ) has become a global issue in the field of water treatment due to its extensive distribution in the natural waterbody and industrial process. Quaternary ammonium (R 4 N + ) strong based anion exchangers are still the main product used for NO 3 − remediation. However, the quaternary phosphonium groups (R 4 P + ) with stronger polarization and anionic affinity have not been adequately studied. This work employed triphenylphosphine (PPh 3 ) and tributylphosphine (TBP) to quaternize chloromethylated macroporous polystyrene resin (PS-Cl), and prepared novel strong anion exchangers (PS-PPh 3 and PS-TBP) for the selective adsorption of NO 3 − . These exchangers exhibited good adsorption performance for NO 3 − in the broad-spectrum pH range of 2.0–11.0. The adsorption capacities of PS-PPh 3 and PS-TBP fitted by Langmuir isotherm were approximately 20.14 and 25.53 mg NO 3 − -N/g, respectively. The adsorption processes of these exchangers could be fitted using pseudo-second-order (PSO) kinetic curves. Both selectivity experiments and density functional theory (DFT) indicated the superior NO 3 − selectivity of quaternary phosphonium exchangers, and demonstrated that the effect of charge distribution density of the exchanger on NO 3 − selectivity was greater than that of steric hindrance and hydrophobicity, which emphasized the importance of enhancing anionic affinity of functional group at low charge density. After five cycles of adsorption–desorption cycles with NaCl desorption solution, these two exchangers still maintained above 90 % of adsorption capacities for NO 3 − . The column experiment and benefit assessment also indicated that quaternary phosphonium exchangers had the good application value and potential to become a substitute for quaternary ammonium anion exchangers when facing extremely complex water matrix.
研究领域:
环境科学
·
水处理
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Lin Wang,Meihua Xin,Mingchun Li,Wenfeng Liu,Yangfan Mao
N -(4- N′, N′, N′ -trimethylphosphonium chloride) benzoyl chitosan (TMPCS), N -(4- N′, N′, N′ -triphenylphosphonium chloride) benzoyl chitosan (TPPCS), and N- (4- N′, N′, N′ -trimethylmethanaminium chloride) benzoyl chitosan (TMACS) were synthesized. The structures of the products were characterized by Fourier transform infrared spectroscopy, Nuclear magnetic resonance spectroscopy and ultraviolet-visible spectroscopy. Their antibacterial activities against Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ) were investigated in vitro using the antibacterial rate, minimal inhibitory concentration (MIC) and minimum bactericidal concentration (MBC), the antibiofilm activity was investigated by crystal violet assay. The antibacterial assessment revealed that the chitosan quaternary phosphonium salts of similar structure had superior antibacterial activity than chitosan quaternary ammonium salt. The antibacterial rate of CS, TMPCS, TPPCS and TMACS against E. coli at 0.5 mg/mL was 10.4 %, 42.0 %, 58.5 % and 21.6 % respectively. At the same concentration, the antibacterial rate of TMPCS, TPPCS and TMACS against S.aureus was all up to 100 %. The biofilm inhibition rate of CS, TMPCS, TPPCS and TMACS at a half of MIC against E.coli was 28.4 %, 33.9 %, 56.6 % and 57.6 % respectively, and against S.aureus was 30.8 %, 53.8 %, 62.2 % and 58.5 % respectively. The biofilm removal rate of CS, TMPCS, TPPCS, TMACS against E.coli at 2.5 mg/mL was 20.6 %, 46.4 %, 48.9 % and 41.6 % respectively, and against S.aureus at 2.5 mg/mL was 41.5 %, 60.4 %, 69.9 % and 59.01 % respectively.
研究领域:
材料科学
·
生物技术
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）