共查询到20条相似文献,搜索用时 109 毫秒
1.
2.
壳聚糖涂膜保鲜杨桃的研究 总被引:2,自引:2,他引:0
研究了不同组成的壳聚糖涂膜保鲜剂对杨桃的保鲜效果。结果表明:壳聚糖涂膜剂对杨桃具有较好的保鲜效果,浸涂保鲜剂的杨桃在贮藏期间其水分、总酸和维生素C的含量均高于对照,而还原糖含量低于对照。壳聚糖涂膜保鲜剂较适宜的配方为:壳聚糖2.5%,乙酸1.5%,甘油1.0%,单硬脂酸甘油酯0.3%,水94.7%。 相似文献
3.
4.
5.
6.
7.
本文采用壳聚糖和茶粉为保鲜剂,以菌落总数、酸价(AV值)、过氧化值(POV值)作为月饼保鲜评价指标,研究月饼在常温保存时的品质变化规律。结果表明,经过壳聚糖涂膜和茶粉添加处理的广式豆沙月饼菌落总数、AV值、POV值均明显低于对照实验组。壳聚糖和茶粉对广式豆沙月饼的保鲜有协同增效作用,最佳保鲜效果的复配组合为:浓度为1. 5%相对分子质量为4 k Da的壳聚糖与浓度为2. 0%相对分子质量为200 kDa壳聚糖的混合配比分别为45%、55%,茶粉添加量为3. 5%。 相似文献
8.
以壳聚糖为成膜保鲜剂、复配防腐剂山梨酸钾和抗氧化剂抗坏血酸,制成了一种荔枝复合涂膜保鲜剂,考察了其在室温(30~35℃)和低温[(6±1)℃]下对荔枝的保鲜效果。结果表明,与对照相比,无论是室温还是低温贮藏,经由1.0%壳聚糖、0.5%山梨酸钾和1.0%抗坏血酸组成的复合涂膜处理,可以显著抑制荔枝发生褐变,明显降低荔枝果实的失重率,减少可溶性固形物、可滴定酸、维生素C等营养物质的消耗,提高了荔枝的好果率,在室温下可使荔枝在6d内保持100%的好果率,而对照在第2d就只有90%的好果率;低温贮藏20d,对照的好果率仅为20%,而处理组的好果率为100%,低温贮藏30d,处理组的好果率仍高达90%。 相似文献
9.
10.
壳聚糖保鲜涂膜纳米SiO_x修饰工艺优化的研究 总被引:2,自引:1,他引:1
为了提高壳聚糖涂膜的力学性能和降低其透水率,实验先以十二烷基磺酸钠(SDS)活化纳米SiOx,随后将其加到壳聚糖乙酸溶液中,并用流延法制得分散比较均匀的壳聚糖纳米复合膜.此外采用二次回归旋转正交组合试验设计方法,优化了壳聚糖/纳米SiO(CTS/SiOx)复合涂膜的制备工艺条件,并通过红外(IR),X射线衍射(XRD)和电镜透射(TEM)手段对CTS/SiOx.复合涂膜的性能和结构进行袭征.优化结果表明,当壳聚糖(CTS)、活化纳米SiOx和单甘酯(Glyc)添加量分别为1.547 g、0.028 g和0.015 g时,CTS/SiOx,复合涂膜的性能达到最优,其拉伸强度和撕裂强度分别为54.85MPa和51.77kN·m-1,分别比未修饰壳聚糖单膜提高了63%和12%,而透水率却下降了73%.将制备的CTS/SiOx复合涂膜用于果蔬室温保鲜,保鲜质量和保鲜时间比对照组均有明显提高. 相似文献
11.
Cristina Ardean Corneliu Mircea Davidescu Nicoleta Sorina Neme Adina Negrea Mihaela Ciopec Narcis Duteanu Petru Negrea Daniel Duda-Seiman Virgil Musta 《International journal of molecular sciences》2021,22(14)
The biomedical and therapeutic importance of chitosan and chitosan derivatives is the subject of interdisciplinary research. In this analysis, we intended to consolidate some of the recent discoveries regarding the potential of chitosan and its derivatives to be used for biomedical and other purposes. Why chitosan? Because chitosan is a natural biopolymer that can be obtained from one of the most abundant polysaccharides in nature, which is chitin. Compared to other biopolymers, chitosan presents some advantages, such as accessibility, biocompatibility, biodegradability, and no toxicity, expressing significant antibacterial potential. In addition, through chemical processes, a high number of chitosan derivatives can be obtained with many possibilities for use. The presence of several types of functional groups in the structure of the polymer and the fact that it has cationic properties are determinant for the increased reactive properties of chitosan. We analyzed the intrinsic properties of chitosan in relation to its source: the molecular mass, the degree of deacetylation, and polymerization. We also studied the most important extrinsic factors responsible for different properties of chitosan, such as the type of bacteria on which chitosan is active. In addition, some chitosan derivatives obtained by functionalization and some complexes formed by chitosan with various metallic ions were studied. The present research can be extended in order to analyze many other factors than those mentioned. Further in this paper were discussed the most important factors that influence the antibacterial effect of chitosan and its derivatives. The aim was to demonstrate that the bactericidal effect of chitosan depends on a number of very complex factors, their knowledge being essential to explain the role of each of them for the bactericidal activity of this biopolymer. 相似文献
12.
综述了壳聚糖及其衍生物在废水治理方面除汞的最新进展,介绍了壳聚糖及其衍生物在不同条件下的吸附能力。其中,壳聚糖对Hg(Ⅱ)离子的吸附能力在430~1 127mg/g之间,而壳聚糖衍生物能增加吸附的稳定性和选择性。此外,磁性吸附技术是近年来研究的热点。 相似文献
13.
壳聚糖及其衍生物的制备和保湿吸湿性能评价 总被引:6,自引:0,他引:6
简要介绍了壳聚糖及其衍生物的制备方法和物化性质。以甘油、山梨醇和透明质酸为参照物,在一定相对湿度下考察了壳聚糖、羧甲基壳聚糖、N—羧丁基壳聚糖等几种保湿剂的保湿吸湿性能。结果显示,羧甲基壳聚糖和N—羧丁基壳聚糖的保湿吸湿性能最优,完全可以替代透明质酸,作为多种化妆品的保湿剂。 相似文献
14.
15.
甲壳素与甲壳胺纤维 3.纤维的化学改性 总被引:2,自引:2,他引:0
作为天然高分子材料,甲壳素和甲壳胺有许多优良的物化和生物活性。通过化学改性,甲壳素和甲壳胺可以获得更多的性能。总结了甲壳素和甲壳胺的化学衍生物和各种复合材料。 相似文献
16.
壳聚糖季铵盐研究进展 总被引:2,自引:0,他引:2
壳聚糖是应用广泛的天然多糖,资源丰富,壳聚糖化学改性后得到的衍生物改善了壳聚糖的功能,并保留了壳聚糖本身的可生物降解性、生物相容性等优点.其中壳聚糖的季铵盐改性明显提高了其抑菌、抗氧化等活性,并增强了壳聚糖的水溶性,近年来研究较多,介绍了壳聚糖季铵盐的化学改性及应用研究进展,这些化学改性方式均在一定程度上提高了壳聚糖的... 相似文献
17.
18.
壳聚糖作为一种天然碱性多糖,具有高附加值、可再生资源、抑菌、无毒、易成膜、可生物降解、螯合重金属等优点。文章综述了壳聚糖在食品工农业方面的应用研究进展情况,详细介绍了壳聚糖、改性壳聚糖和复合壳聚糖在果蔬保鲜、植物诱导、防止微生物生长、果汁澄清、添加剂和食品工业废水方面的应用性能,并对壳聚糖在食品中应用的未来发展进行展望。 相似文献
19.
甲壳素与甲壳胺纤维4.纤维在生物医药领域中的应用 总被引:3,自引:2,他引:1
甲壳素和甲壳胺是广泛存在于动物和植物中的天然高分子材料。近年来,这两个高分子的生物相容性、生物可降解性、对伤口愈合的促进性能和其它一些优异性能在生物医药领域引起了重视。甲壳素和甲壳胺纤维既具有天然高分子的生物活性,又有纤维材料的特性,在手术缝合线、医用敷料、人工皮肤、硬组织修复材料、人工肾膜、抗菌材料、保健内衣面料、药物缓释等材料中得到了广泛的应用。 相似文献
20.
Cotton fabrics treated with a crosslinking agent, epicholorohydrin, in the presence of chitosan (CEC) provide many possible reactive sites for reactive dyes and antimicrobial properties of the grafted chitosan to the cellulose structure. This process was applied by means of the conventional mercerizing process. The chitosan finishing and durable press finishing of the cotton fabrics occurred simultaneously in the mercerization bath. ECH is expected to react with hydroxyl groups in cellulose and chitosan or with amino groups in chitosan to form alcohol crosslinking by the Belfast process. The fixed chitosan content in the CEC was calculated by the nitrogen percentage of an Elemental Analyzer. The color strength (K/S) of the reactive dyes of the treated cotton fabrics did not significantly change with an increase of chitosan; however, the degree of swelling of the treated cotton fabrics decreased with an increase of chitosan and ECH. These performances were retained through 20 washing and tumble drying cycles. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010 相似文献