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低聚乳果糖的初步提纯 总被引:2,自引:0,他引:2
采用粉末状活性炭对低聚乳果糖酶反应液进行脱色,研究了活性炭用量、脱色温度和脱色时间对低聚乳果糖反应液脱色的情况,实验结果表明:当活性炭用量为3%,温度60℃,吸附时间45min,低聚乳果糖反应液的脱色效果明显,低聚乳果糖的损失率仅为3.33%。 相似文献
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通过水解角蛋白分子量、氨基酸含量、脱色效果的测试,研究了角蛋白水解条件及其产物在不同脱色条件下的脱色能力。结果表明,水解角蛋白经适当改性,对大多数种类的染料具有良好的脱色效果。 相似文献
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大孔吸附树脂脱色乳酸的研究 总被引:3,自引:0,他引:3
本文提出并研究了大孔吸附树脂脱色乳酸的新工艺,选出了合适的吸附树脂及其再生方法,并进行了交换柱脱色实验。结果表明,H103和NKA-2具有较好的脱色效果,其中以H103脱色效果更好。在交换柱中进行乳酸脱色,单批处理量为10ml/g树脂时,H103的脱色率在70%以上。 相似文献
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研究了菌株XC6对直接、分散、活性、酸性和碱性5大类染料的脱色性能。结果表明,最易脱色的为分散、直接和酸性染料,最难脱色的为碱性染料阳离子黄;而对于活性染料,有些极易脱色,有些却很难脱色。说明染料在生长茵体上的脱色取决于染料的结构与性质。对其脱色机理进行了初探。结果表明,菌株XC6在脱色过程中,染料先被吸附到茵体表面,然后富集到茵体内,在酶的作用下降解;活性绿还与机体内的某些成分发生反应。 相似文献
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以钛酸四丁酯为钛源,采用溶胶法制备FeSO4掺杂的光催化剂TiO2,并将光催化剂负载于活性炭,然后将活性炭填装于冷电弧-光催化-吸附集成装置中,用该装置对木瓜多糖进行脱色。以木瓜多糖的脱色率和糖保留率为指标,研究脱色时间、加载电压、活性炭填充率及木瓜多糖初始质量浓度4个因素对指标的影响。在单因素试验的基础上,利用二次回归正交旋转组合设计优化木瓜多糖的冷电弧-光催化-吸附脱色工艺,建立回归模型并确定最佳脱色工艺条件。结果表明,在脱色时间22.7min、电压24.0kV、活性炭填充率41.4%及木瓜多糖质量浓度3.7mg/mL条件下,脱色率和多糖保留率分别达为73.2%和76.6%。 相似文献
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为寻求一种理想的活性染料氧化脱色技术,用二氧化氯(ClO2)对存在于染料废水及有色纺织品中的3种不同结构的活性染料进行脱色处理,分别用紫外可见光谱仪和测色配色仪对染料废水和织物中的染料进行脱色性能测试。结果表明:在常温常压下,ClO2对以这2种形式存在的染料均有较好的处理效果;染料废水中的3种染料经脱色处理1 h后脱色率均达到95%以上;有色纺织品中的3种染料经剥色处理1 h后K/S值明显下降,为有色纺织品的剥色提供了一种新思路。 相似文献
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为研究乌龙茶多糖(oolong tea polysaccharides,OTPS)聚酰胺柱层析脱色脱蛋白的效果,首先采用单因素试验,以脱色率、脱蛋白率和多糖保留率为评价指标,从上样量、上样体积、吸附平衡时间以及洗脱速率4 个方面确定了聚酰胺柱层析的洗脱条件。然后通过脱色率、脱蛋白率、多糖保留率、产品得率和抗氧化活性5 个方面,比较了OTPS聚酰胺柱层析与常用的Sevag-H2O2联用法脱色脱蛋白的效果。结果表明:OTPS聚酰胺柱层析法脱色脱蛋白的最佳工艺条件为4 mg OTPS/mL聚酰胺,2/5 倍柱体积去离子水溶解上样,吸附平衡20 min,3 mL/min速率洗脱;聚酰胺柱层析对OTPS的脱色率和脱蛋白率略低于Sevag-H2O2联用法,但多糖保留率、产品得率和抗氧化活性显著高于Sevag-H2O2联用法,而且方法简单,无环境污染,是一种较好的OTPS脱色脱蛋白方法,也可应用于其他多糖的脱色脱蛋白。 相似文献
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Bao-Lin He Li-Qiong Guo Qian-Wang Zheng Shuo-Xin Lin Jun-Fang Lin Tao Wei Zhi-Wei Ye 《International Journal of Food Science & Technology》2019,54(5):1741-1751
The aim of this study was to develop an effective one-step decoloration and deproteinisation method using macroporous resin for Cordyceps militaris polysaccharide (CMP) extraction. Performances of different resins were compared, and the structures and bioactivities of CMP recovered using this one-step method were evaluated and compared with traditional methods. The results showed that NKA-9 resin exhibited the highest adsorption capacity for pigment and free protein than other tested resins. Under the optimised condition, NKA-9 resin adsorption exhibited high decoloration ratio (80.69%), deproteinisation ratio (62.51%) and polysaccharide recovery ratio (78.08%). Furthermore spectroscopic analysis revealed that the structure of CMP remained unchanged after adsorption, but some reagent residues can be detected using traditional methods. Compared with traditional methods, the antioxidant activity of CMP extracted using a one-step method was significantly higher, without negative impact on cell viability. Thus, this novel technique is a promising alternative method for CMP separation and purification. 相似文献
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Oxygen uptake of a model system containing β-carotene was measured by a method capable of determining headspace oxygen and entrapped oxygen, both at low concentrations. β-Carotene was determined colorimetrically at 460 nm. A first-order mechanism was found for this reaction with respect to β-carotene concentration as measured by color. The values of the rate constants were functions of the oxygen concentrations in the headspace of samples; they increased as these concentrations increased. Up to seven molecules of oxygen were consumed as each molecule of β-carotene was discolored. This high oxygen consumption was not related to the oxidized products. A mathematical model was developed, based on the experimental data, to predict β-carotene decoloration by measuring oxygen uptake or to determine oxygen uptake from decoloration. A computer program was developed to make these predictions. Samples with known histories had linear correlations between oxygen uptake and β-carotene decoloration. The results for 1% and 2% headspace oxygen concentrations agreed with experimental values, presenting a standard deviation compatible with the experimental methods used. An important corollary is the suitability of a simple colorimetric test for monitoring oxygen uptake in a dehydrated system. 相似文献
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探讨芒果皮渣多糖纯化过程中蛋白质和色素的脱除方法。以蛋白质脱除率和多糖保留率为评价指标,比较三氯乙酸法、三氯乙酸-正丁醇法、Sevage法、HCl法、木瓜蛋白酶法、三氯乙酸+Sevage法、木瓜蛋白酶+三氯乙酸法、木瓜蛋白酶+Sevage法和木瓜蛋白酶+三氯乙酸-正丁醇法对芒果皮渣多糖的脱蛋白效果;以脱色率和多糖保留率为评价指标,在单因素实验的基础上,通过正交实验优化活性炭对脱蛋白后多糖溶液的脱色工艺。结果表明:三氯乙酸-正丁醇法脱蛋白效果最佳,其条件为三氯乙酸-正丁醇与样液体积比2:1、三氯乙酸与正丁醇体积比1:20、振荡时间2 h,此时蛋白质脱除率为90.08%,多糖保留率率为94.40%;活性炭脱色最佳工艺条件为:样液pH3.0,活性炭添加量1.5%,脱色温度50℃,脱色时间75 min,此条件下脱色率为70.98%,多糖保留率为92.77%。本实验筛选的方法切实可行,可用于芒果皮渣多糖的脱蛋白和脱色。 相似文献