Foods
·
2024
·Vol. 13
·期 20
·3295
·
IF 4.7
Kok Bing Tan,Meixia Zheng,Junyan Lin,Yujing Zhu,Guowu Zhan,Jianfu Chen
Loquat leaf extract (LLE) was added to guar gum and pullulan as an environmentally friendly packaging film (GPE) to preserve Chinese water chestnuts (CWCs). The effect of the amount of LLE on the guar gum/pullulan composite film was investigated. The optimal amount of LLE was 4% (GPE4), with lower water vapor permeability (WVP) and greater mechanical strength, antioxidant, and comparable antibacterial performance than many pullulan-based films. Upon packing the CWCs for 4 days, the weight loss rate of GPE4 was only 1.80 ± 0.05%. For GPE4, the POD activity, the soluble solid content, and the vitamin C (Vc) content of the CWCs were 21.61%, 36.16%, and 26.22% higher than those of the control sample, respectively. More importantly, GPE4 was effective in preserving the quality of CWCs after 4 days of storage, better or at least comparable to non-biodegradable plastic wrapping (PE). Therefore, it can be concluded that GPE films hold significant promise as a sustainable alternative packaging material for preserving fruit-based foods like CWCs, potentially replacing PE in the future.
研究领域:
食品科学
·
包装工程
·
植物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 10
·4088
·
IF 4.6
Feng Li,Wenzhi Lv,Dena Huang,Chenglu Zeng,Runping Wang
The molecular weight of lignin extracted from lignocellulosic biomass is an important factor in determining its valorization in industrial processes. Herein, this work aims to explore the extraction of high molecular weight and bioactive lignin from water chestnut shells under mild conditions. Five kinds of deep eutectic solvents were prepared and applied to isolate lignin from water chestnut shells. The extracted lignin was further characterized with element analysis, gel permeation chromatography, and Ultraviolet-visible and Fourier-transform infrared spectroscopy. The distribution of pyrolysis products was identified and quantified with thermogravimetric analysis—Fourier-transform infrared spectroscopy and pyrolysis-gas chromatograph-mass spectrometry. The results showed that choline chloride/ethylene glycol/p-toluenesulfonic acid (1:1.8:0.2 molar ratio) exhibited the highest fractionation efficiency for lignin (84.17% yield) at 100 °C for 2 h. Simultaneously, the lignin showed high purity (90.4%), high relative molecular weight (37,077 g/mol), and excellent uniformity. Furthermore, the aromatic ring structure of lignin remained intact, consisting mainly ofp-hydroxyphenyl, syringl, and guaiacyl subunits. The lignin generated a large number of volatile organic compounds during the depolymerization process, mainly composed of ketones, phenols, syringols, guaiacols, esters, and aromatic compounds. Finally, the antioxidant activity of the lignin sample was evaluated with the 1,1-diphenyl-2-picrylhydrazyl radical scavenging assay; the lignin from water chestnut shells showed excellent antioxidant activity. These findings confirm that lignin from water chestnut shells has a broad application prospect in valuable chemicals, biofuels and bio-functional materials.Keywords:deep eutectic solvent;lignin;water chestnut shell;antioxidant activity;pyrolysis
研究领域:
化学工程
·
材料科学
·
生物技术
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POSTHARVEST BIOLOGY AND TECHNOLOGY
·
2023
·
IF 7
Yali Fan,Jialin Duan,Zhiyan Xu,Yunmin Shi,Lanxiang Jiang,Yulin Li,Ming Ni
Yellowing and quality loss shorten the shelf life of fresh peeled water chestnuts (FPWCs). The purpose of this study was to elucidate the mechanism by which the combination of 3’,4’,5,7-tetrahydroxy isoflavone (3’,4’,5,7-THIF) and active modified atmosphere packaging (AMAP) prolonged the shelf life of FPWCs. FPWCs were treated with 1.0% 3’,4’,5,7-THIF, AMAP (18.3% O 2 , 81.7% N 2 ), and a combination of 1.0% 3’,4’,5,7-THIF and AMAP (18.3% O 2 , 81.7% N 2 ). The yellowing extent, mass loss rate, enzymatic activities, yellowing substance concentrations, quality, and microorganisms of FPWCs were analyzed. The results showed that the three treatments all inhibited the increase in the mass loss rate and activity of peroxidase and lowered the eriodictyol concentration. AMAP (18.3% O 2 , 81.7% N 2 ) and the combination of 1.0% 3’,4’,5,7-THIF and AMAP (18.3% O 2 , 81.7% N 2 ) inhibited the respiration of FPWCs and increased the total soluble solids, titratable acidity, and ascorbic acid concentrations. The three treatments had no significant effects on the activities of polyphenol oxidase and phenylalanine lyase and naringenin concentration. 3’,4’,5,7-THIF (1.0%), AMAP (18.3% O 2 , 81.7% N 2 ), and the combination of 1.0% 3’,4’,5,7-THIF and AMAP (18.3% O 2 , 81.7% N 2 ) prolonged the shelf life of FPWCs by 6, 6, and 12 d, respectively. The combination of 1.0% 3’,4’,5,7-THIF and AMAP (18.3% O 2 , 81.7% N 2 ) was optimal among the three treatment methods. These results suggested that the combination of 1.0% 3’,4’,5,7-THIF and AMAP (18.3% O 2 , 81.7% N 2 ) might be used to extend the shelf life of FPWCs in practice.
研究领域:
食品科学
·
植物化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）