共查询到18条相似文献,搜索用时 140 毫秒
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粗淀粉酶酸法生产液体葡萄糖新工艺的研究 总被引:3,自引:0,他引:3
以粗淀粉原料直接投料,用酶液化、离交酸化糖化工艺生产液体葡萄糖,比传统的酶酸法工艺生产的产品质量好,比常用的双酶法工艺生产过滤快,产量高,效益好。 相似文献
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以直接投料粗淀粉,用酶液化、离交酸化糖化工艺生产液体葡萄糖,比传统的酶酸法生产的产品质量好,比双酶法生产过滤快,产量高,效益好。 相似文献
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酶法提取金樱子总黄酮的研究 总被引:3,自引:1,他引:3
对金樱子黄酮类化合物的酶法提取工艺进行了研究.采用单因素实验考察了纤维素酶、果胶酶、木瓜蛋白酶、复合酶(纤维素酶+果胶酶+β-葡聚糖酶+半纤维素酶+木瓜蛋白酶)对总黄酮提取率的影响及酶解温度,酶解液pH值,酶解时间和酶用量对总黄酮产量的影响,通过正交试验设计确定了酶法提取金樱子总黄酮的最佳提取工艺条件:酶解温度为50℃,酶解液初始pH=4.5,酶解时间为120min,酶的用量为0.35mg/mL的复合酶(纤维素酶+果胶酶+β-葡聚糖酶+半纤维素酶+木瓜蛋白酶).实验结果表明:在一定条件下,复合酶的酶解效果比单一酶好,纤维素酶酶解效果比果胶酶好,木瓜蛋白酶在单独使用时基本没有效果.根据正交实验确定的最佳酶提取工艺条件与传统的直接醇提取工艺相比,金樱子总黄酮产量提高了26.2%. 相似文献
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用碱、漆酶、精练酶通过正交设计实验对竹原纤维进行纤细化处理,测定了处理后的竹原纤维细度变化率、木质素含量及强度。结果表明:精练酶去除木质素的效果比碱和漆酶处理好,木质素含量从原来的18.98%降为7.27%,处理后竹原纤维强度几乎没有损伤;碱去除木质素的效果比漆酶好,但强度损伤比漆酶处理大;生物酶脱胶方法有望成为竹原纤维脱胶加工的实际生产方法。 相似文献
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利用单因素实验、正交实验分别确定水提取法、乙醇提取法、酶解法制备速溶普洱茶的最佳工艺参数。实验结果表明,水浸提法制备速溶普洱茶的最佳工艺参数为料液比(m/v)为1∶8、浸提温度为80℃、浸提时间为60min,产品得率为12.16%;乙醇浸提法的最佳工艺参数为料液比(m/v)为1∶12、浸提温度为80℃、浸提时间为60min,产品得率为17.14%;酶解法的最佳工艺参数为复合纤维素酶∶果胶酶∶蛋白酶=1∶1∶1,酶添加量为0.75%,酶解温度为45℃,酶解60min,茶水比(m/v)为1∶12,浸提2次,产品平均得率为26.23%。将三种工艺进行比较分析可知,酶解法生产速溶普洱茶产品得率最高,且普洱茶中茶可溶性多糖、游离氨基酸含量高于水浸提法与乙醇浸提法。乙醇浸提法生产速溶普洱茶的茶多酚含量最高,产品得率次之。综合考虑选择酶解法生产速溶普洱茶。 相似文献
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The accuracy of several commonly used methods for glucose measurement in the presence of tea polyphenols (TPLs) was investigated since TPLs (as a representative of bioactive polyphenols) and glucose often co-exist in experiments exploring TPLs’ effect on carbohydrate metabolism. The results from a model system containing only glucose and TPLs showed a TPLs’ amount-dependent variation of measured glucose concentration with a relative error (RE) of 5.0% to 35.5% when a dinitrosalicylic acid (DNS) method was used, and for glucose oxidase/peroxidase assay, the results showed a decreased content of glucose with a RE from 56.7% to 102.7%. When a hexose/kinase (HK) method was employed to quantify the glucose content, the accuracy (RE from 0.57% to 4.7%) was comparable to the result obtained by a high performance liquid chromatography (HPLC) method (RE = 0.7–3.0%) that was used as the standard control. Starch digestion experiment further demonstrated the invalidity of DNS method and the accuracy of HK method. Thus, the HK method with its accuracy and convenience is the preferred method for glucose measurement in the presence of TPLs or other bioactive polyphenols. 相似文献
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荔枝核提取物及其阳离子树脂分离物体外降血糖作用 总被引:1,自引:0,他引:1
研究荔枝核乙醇提取物(LSE)和其阳离子树脂分离物(FCE)体外降血糖作用。采用高糖和高胰岛素所致的两种HepG2细胞模型,在模型培养中添加不同浓度的LSE与FCE,以葡萄糖试剂盒测定,MTT法等进行对HepG2细胞葡萄糖消耗作用的研究。结果表明:在高糖环境下,LSE和FCE均能促进HepG2细胞的葡萄糖消耗,而FCE的促进作用显著高于相近浓度的LSE,提示离子交换树脂分离物贡献了荔枝核提取物的降糖作用;此外,FCE还可与低剂量胰岛素协同增加细胞的葡萄糖消耗。在胰岛素抵抗模型中,FCE能显著降低胰岛素抵抗,增加细胞的葡萄糖消耗。荔枝核提取物和其阳离子树脂分离物具有体外降血糖作用。 相似文献
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Arlindo I. Teixeira Lucas F. Ribeiro Sebastião T. Rezende Everaldo G. Barros Maurílio A. Moreira 《Food chemistry》2012
The sucrose content of soybean seeds affects the final flavor of soy-derived products. The aim of this work was to develop a simple, low-cost, spectrophotometric method for sucrose quantification in soybean seeds. To achieve this goal, we combined the action of invertase, an enzyme that hydrolyses sucrose into fructose and glucose, with glucose oxidase, an enzyme widely used for glucose quantification. This system was adapted to ELISA plates, making large-scale analyses possible at low cost, with potential application in routine analyses. To validate this method, sucrose content was determined in seeds of 14 soybean cultivars by this new method, as well as by HPLC and the enzymatic method of Stitt. The correlation coefficients were high and significant between the results obtained with the new method and the HPLC method (r = 0.9766) and the Stiff method (0.9461). 相似文献
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制成了固定化酶化学发光型葡萄糖传感器,此传感器可用于对葡萄糖的在线快速检测。用MCM-41介孔分子筛固定葡萄糖氧化酶(GOD),制成GOD酶柱,并用于流动注射化学发光分析。酶柱的使用条件为:柱温40℃,葡萄糖溶液pH=6.0,流速3 r/min。测定的线性范围为1~200 mg/L,检出限为0.2 mg/L,10次测定的RSD为1.8%,回收率在97.81%~102.0%。测定结果与国标方法的测定结果无显著性差异。 相似文献
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酶法测定大麦提取物β-葡聚糖含量研究 总被引:2,自引:0,他引:2
目前国际认可β-葡聚糖含量测定方法是酶法,此法测定成本高,我国目前多采用苯酚- 硫酸法测定,但测定结果准确性较差。该研究在国际β-葡聚糖酶法测定基础上用纤维素酶代替昆布多糖水解酶水解β-葡聚糖,用苯酚-硫酸法代替葡萄糖试剂盒法测定β-葡聚糖酶解后得到葡萄糖含量,设计适于我国应用的β-葡聚糖酶法测定方法。此法测定过程为:1.5 ml浓度为60μg/mL 标准β-葡聚糖和一定浓度样品,用浓度为50U/mL纤维素酶0.5 ml酶解60 min;然后用蒸馏水稀释至30 ml,从中吸取0.5 ml到另一试管,再加入浓度为2 U/mL β-葡聚糖酶1ml,作用15 min后,用苯酚-硫酸法测定标准β-葡聚糖和样品酶解液中葡萄糖含量,计算出样品中β-葡聚糖含量。 相似文献