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张军 《国际沙棘研究与开发》2012,(1):1-4,11
沙棘叶SDF提取最佳料液比为1:20。NaOH预处理最佳条件为50目,沙棘叶粉以1:20的比例用蒸馏水调浆,用NaOH调至溶液浓度为0.5%,在50℃条件下预处理2h。纤维素酶提取的最佳工艺条件为:加酶量50uL/g,温度50℃,时间4h,pH7.0。沙棘叶中原水溶性膳食纤维含量为11.38%,采用此工艺提取比原料中提高近2.5倍。H2O2漂白处理的最佳工艺条件为:浓度3%、温度25℃、pH值8.0条件下处理3h。 相似文献
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本文以豆粕为原料,探讨超声水提法和超声结合酶法提取豆粕中水溶性膳食纤维工艺条件,并对其功能性进行研究。结果表明:超声水提取最佳工艺条件为料液比1∶25、超声时间20min和超声功率175W,豆粕中水溶性膳食纤维提取率最高为12.14%;超声结合酶法提取最佳工艺条件为料液比1∶20、加酶量5%、超声时间20min和超声功率125W,豆粕中水溶性膳食纤维提取率为15.68%,比超声水提法提取率提高了29.2%。豆粕中水溶性膳食纤维对·O2-自由基表现出较强的清除能力,其IC50为0.45mg/mL;豆粕中水溶性膳食纤维的持水力为358%,膨胀力为2.43mL/g。 相似文献
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本文以生姜为原料,采用超声水提法和超声结合酶法提取生姜中总膳食纤维,探讨了料液比、超声时间、超声功率和加酶量等对提取率的影响,通过正交试验优化工艺条件,并对其性能进行研究。结果表明:超声水提取最佳工艺条件为料液比1:20、超声时间10min和超声功率150W,生姜中总膳食纤维提取率最高为63.14%;超声结合酶法提取最佳工艺条件为加酶量4%、料液比1:25、超声时间5min和超声功率150W,生姜中总膳食纤维提取率为78.96%,比超声水提法提取率提高了25.1%。生姜中水溶性膳食纤维的持水力为880%,膨胀力为15.02mL/g。 相似文献
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为增加玉米芯资源的附加值,以玉米芯为试验材料,以多糖为研究对象,通过对比分析和L9(34)正交试验设计等研究方法,重点考察不同浸提温度、时间和料液比对玉米芯多糖提取率的影响。结果表明:3因素对多糖得率的影响顺序为:温度〉浸提时间〉料液比;最佳提取工艺条件为浸提温度100℃、时间4h、料液比1:30,多糖平均得率为2.96%。 相似文献
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采用微波辅助法提取低温豆粕中的大豆蛋白,通过单因素试验和L9(33)正交试验研究了微波功率、提取pH值、料液比、微波时间、酸沉pH值对大豆蛋白得率的影响。结果表明:在试验条件范围内各因素对大豆蛋白得率的影响主次顺序为:料液比>微波功率>微波时间;微波提取大豆蛋白的最佳提取条件为:微波功率288W、提取pH值11.5、料液比1:30g/mL、微波提取时间300s、蛋白质酸沉pH值4,在此条件下蛋白得率为65.3%,产品中的蛋白质含量高达90.1%。 相似文献
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浸提法提取黑米色素的工艺研究 总被引:1,自引:0,他引:1
本文以黑米为原料,在充分把握天然黑色素稳定性的基础上,对黑米色素的提取方法进行了分析研究,分别考察了温度、时间、酸度、乙醇浓度、料液比等试验条件对提取效果的影响,并通过正交试验确定了成本低、纯度高、工艺简单的乙醇浸提法提取黑米黑色素的最佳条件及精制工艺。乙醇浸提法提取天然黑色素的最佳工艺条件:浸提温度为60℃、浸提时间60min、浸提剂乙醇浓度80%、料液比(g/mL)1:5、浸提剂pH值为3、提取级数1级,在535nm下吸光度A为0.514,提取率达到2.35%。 相似文献
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以水为提取剂进行山药多糖的提取,利用正交法确定山药水溶性多糖的最佳提取条件为:粉碎程度100目、料液比1︰45、提取温度45℃、提取时间2.5h。此条件下多糖得率最高,是提取山药多糖较理想的工艺条件。山药水溶性多糖提取液经透析纯化,干燥后为深黄色固体,得率为2.97%。 相似文献
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为探讨油茶籽糖蛋白的最优提取工艺及抗氧化活性,在单因素试验基础上采用响应面法对提取油茶糖蛋白的关键参数进行了优化。同时以维生素C作为对照,采用4种不同方法考察了油茶籽糖蛋白的抗氧化性能。结果表明,油茶籽糖蛋白的最佳提取工艺条件为:浸提时间8.81 h、提取盐浓度0.12 mol/L、pH值8.77和液料比11.62 mL/g,在此条件下蛋白得率为8.76%,糖得率为10.14%。抗氧化试验表明,油茶籽糖蛋白能显著清除DPPH、羟基自由基和超氧阴离子自由基,具备一定的还原能力。 相似文献
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《Journal of Agricultural Engineering Research》1998,69(3):249-254
A model to represent the discolouration of dried powder of carrots as a function of temperature was developed. Two types of carrots, Asian and European, containing large amount of lycopene and β-carotene, respectively, were tested. The dried powder was stored under an atmosphere with O2and at three different temperatures, 5,20 and 35°C. The surface colour of the powder was monitored during storage by a Hunter colour ratioa/b. In the proposed model, the rate of oxidation was assumed to be represented by the product of the fraction of concentration of oxidized pigment at arbitrary time and a specific rate of oxidation of pigment. The rate parameters in the proposed model were calculated by fitting the experimental data with smooth curves by trial and error at the end of the induction period but before discolouration took place. The frequency constant and activation energy, expressing the temperature dependence of the rate parameters, were expressed by the Arrhenius relation. The simulation results of a Hunter colour ratioa/bof dried powder at 25°C showed good agreement with the experimental data, suggesting that the proposed model was effective for the prediction of discolouration of dried powder of both types of carrot. The use of the induction period in the manner described may enable the shelf life of dried powder to be predicted. 相似文献
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感官检验棉花的品级,这是农村常见的一种检测手段.它的一个主要特点就是存在不确定性.这是由于检验员的品级检验水平存在一定的差异,其中有很多因素制约着检验的结果.文章对影响感官检验结果的因素进行了系统的分析. 相似文献
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The fractional outflow rate of water from the rumen, measured as the rate of disappearance of the chromium complex of ethylenediamine tetra-acetic acid, was related to a number of dietary factors. A multiple regression equation was derived which expressed fractional outflow rate as a function of the intakes of dry matter, ash, acid-detergent fibre and crude protein.The data analysed consisted of 243 observations for sheep on 59 diets, including forage, concentrate and mixed diets. The ranges covered by the data were: fractional outflow rate 0.7–3.6 day?1; dry matter intake 560–1400g/day; ash 4–30%, acid-detergent fibre 7–41%, crude protein 5–26 % of dry matter; there were no observations for sheep of less than 34 kg liveweight.The equation accounted for 56·3 % of the total variance. Between-sheep variance could not be calculated for the whole of the data but was undoubtedly substantial since, for a sixth of the data, it was known to account for 38 % of the total variance. 相似文献
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从灾害经济学的角度探讨了城镇供水优化调度的必要性和可能性,认为在缺水不可避免的情况下,对供水进行优化调度可以减小缺水带来的损失,产生较好的减灾效益,特别是可以大大减小严重干旱的灾害效应。并根据水资源的特性,提出了缺水损失的计算模式以及优化调度的原则和方法。 相似文献