壳聚糖的粘流性及织物表面固着的研究

探讨了壳聚糖乙酸胶液在不同状态下的粘度特征,分析了其流体动力学的稳定性,比较了超声波、加热、微波等物理方法促进壳聚糖固着时对织物透气性的影响,确定了壳聚糖向织物组织内部渗透并固着的工艺条件。     

壳聚糖澄清梨汁的研究

采用1%的壳聚糖溶液作用于梨汁,研究了壳聚糖对梨汁的澄清效果。进行正交实验后,获得壳聚糖对梨汁澄清的最适工艺条件:添加0.2g/L壳聚糖,在35℃下澄清60min,梨汁的最高透光率达92.97%。     

低分子量壳聚糖改性棉织物染色动力学研究

采用低分子质量壳聚糖对棉织物进行改性处理,用活性黑染料对其进行染色,讨论了壳聚糖改性对棉织物染色性能的影响,测定了其染色动力学参数。实验发现,通过壳聚糖改性后的棉织物,其平衡上染百分率可提高7.89%,染色扩散系数均得到提高(平均可至少提高了8.2%),扩散活化能下降了48.9%,表明壳聚糖改性可提高活性染料的染色性能。色度学参数值及K/S值结果表明,壳聚糖改性棉织物在活性黑染料中的增深效果明显,但对色光影响较小。     

壳聚糖对Nisin抑菌稳定性的影响研究

研究了壳聚糖对乳酸链球菌肽（Nisin）抑菌稳定性的作用,并利用红外光谱仪和差式扫描量热仪（DSC）分析了壳聚糖对Nisin保护作用的机理。结果表明：壳聚糖可以显著提高Nisin的抑菌稳定性,在不同的温度及pH范围内,其保护效果有所差异;壳聚糖浓度在1％时效果最好;红外光谱和DSC图谱研究显示,壳聚糖能与Nisin形成氢键,稳定Nisin的空间结构,并能提高Nisin的热稳定性,从而改善了其抑菌稳定性。     

Effects of initial albumen quality and mineral oil–chitosan emulsion coating on internal quality and shelf‐life of eggs during room temperature storage

Effects of mineral oil (MO) and mineral oil–chitosan emulsion (MO:CH = 25:75) as coatings on internal quality and shelf‐life of eggs were evaluated during 5‐week storage at 25 °C. Eggs with three different initial albumen qualities [Haugh unit (HU): H = 87.8, M = 75.6 and L = 70.9] were evaluated. As storage time increased, HU and yolk index values decreased whereas weight loss increased. Coating with MO and/or 25:75 MO:CH emulsion could preserve the internal quality for at least 4 more weeks for H‐eggs and at least 3 more weeks for M and/or L‐eggs, all with weight losses <0.92%. All coated eggs had >70% positive purchase intent, and their colour differences at week 0 could not be detected by naked human eye (ΔE^* < 3.0, noncoated eggs as reference). Consumers significantly differentiated freshly MO‐coated from noncoated eggs on overall surface appearance. This study demonstrated that MO and 25:75 MO:CH emulsion coatings could preserve internal quality and prolong shelf‐life of eggs.     

壳聚糖涂层法固定化脂肪酶的研究

研究了壳聚糖涂层在纤维素滤纸上成膜后再固定化猪胰脂肪酶的最佳条件。结果表明,当戊二醛浓度为５％,活化１２ｈ,与ｐＨ７．６的酶的磷酸盐缓冲溶液于室温（１５℃）交联１２ｈ,获得的固定化酶活最高,为０．２６Ｕ／ｃｍ２。固定化酶最适温度４０℃,比游离酶提高了５℃;最适ｐＨ８．５,与游离酶相比,向碱性偏移了０．５个ｐＨ     

茶多酚-壳聚糖纳米共悬液的制备及性质研究

利用离子交联法制备了茶多酚壳-聚糖纳米共悬液。全面研究了影响共悬液中茶多酚-壳聚糖颗粒粒径分布及茶多酚包封率的因素,结果显示:pH值、搅拌速度、反应温度、壳聚糖浓度、茶多酚添加量、三聚磷酸钠与壳聚糖质量比以及超声处理对粒径分布与包封率均有不同程度的影响,进而优化了制备工艺,并对最佳工艺条件下制备的茶多酚-壳聚糖纳米共悬液的性质做了研究。     

甲壳素脱乙酰酶的研究进展

甲壳素脱乙酰酶(CDA)是一种可以将甲壳素转化为壳聚糖的酶类,而壳聚糖在食品、医药、化工等领域有着广泛的应用,它的生物制备技术是目前国际关注的焦点问题。就CDA的产生菌、酶的作用机理、酶的生物学功能等方面进行了综述,并对CDA潜在的应用价值进行了展望。     

提高细旦涤纶仿真丝织物的透气性研究

研究了细旦涤纶仿真丝绸的前处理和后整理对织物透气性的影响,实验证明织物经碱减量前处理后透气性提高,但随之断裂强力也下降,在保证一定强力的前提下选择碱减量工艺。织物经碱减量后再经壳聚糖整理,织物的透气性进一步提高。