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利用树脂D392进行低聚木糖提取液脱色的研究 总被引:1,自引:0,他引:1
研究采用阴离子交换树脂D392对低聚木糖粗糖浆进行脱色,采用单因素实验,分别用静态吸附和动态吸附法确定脱色的最佳工艺参数.结果表明:温度50℃、脱色时间3 h、糖浆pH 8.0条件下的静态吸附,脱色率为90.72%;动态脱色试验结果为:最佳流速为1.0 mL/min,低聚木糖粗糖浆与树脂的体积比为13:1,脱色率为89.26%;最佳的解吸条件为ω(NaOH)=10%水溶液和无水乙醇的混合溶液,Ⅴ[ω(NaOH)10%水溶液]:Ⅴ[无水乙醇]=1:1,解吸率达93.13%. 相似文献
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水苏糖液脱色树脂的筛选及其工艺优化 总被引:1,自引:0,他引:1
对DA201-C、D280、AB-8、D301R、001×7及D113这6种树脂进行水苏糖提取液的脱色研究,经过静态吸附实验选出了3种树脂:DA201-C、AB-8和D301R。采用正交实验对脱色条件进行优化,确定了水苏糖提取液脱色的最佳条件为:AB-8树脂、pH5.0、温度30℃,此时提取液的脱色率达86.7%,水苏糖的保留率83.4%。最后对选定的脱色树脂采用不同工艺参数研究其对水苏糖提取液脱色的影响,确定AB-8树脂脱色的最佳洗脱流速为1.5BV/h。 相似文献
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比较不同类型的大孔树脂对熟地多糖提取液脱色效果的影响,并确立其脱色的最佳工艺参数。通过静态吸附,比较HP20、DM130、X-5、S-8、D-101、NKA-II 6种不同极性的大孔吸附树脂对多糖提取液脱色效果与含量影响,在相同实验条件下筛选出脱色效果最好的一种树脂并采用正交试验优化其脱色参数,以时间(A),温度(B),药料比(C),振荡时间(D)为考察因素,多糖脱色率(%)和多糖剩余率(%)为指标进行L9(43)正交试验。6种大孔吸附树脂中,DM130大孔吸附树脂对熟地多糖提取液脱色效果最好。通过正交试验发现DM130吸附多糖的最佳参数为:温度30℃,多糖液与树脂体积比4∶1,振荡3 min,反应5 h,脱色效果为74.68%,多糖损失率26.21%。采用DM130型大孔树脂对熟地多糖提取液进行脱色,具有最优的效果。 相似文献
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《食品科技》2017,(1)
采用混合离子交换树脂对玉米芯低聚木糖提取液脱盐脱色工艺进行优化,并利用薄层层析和高效液相色谱对提取的玉米芯低聚木糖组分进行分析。结果表明,玉米芯低聚木糖混合离子交换树脂脱盐脱色最佳工艺为:D301和001×7离子交换树脂混合比例1:1,反应温度50℃,反应时间120 min,还原糖浓度为0.570 mg/m L,p H5.0,在该条件下低聚木糖溶液的脱盐率为98%,脱色率为76%,还原糖保留率为65%。组分分析表明,玉米芯低聚木糖提取液中主要为木糖、木二糖、木三糖和木四糖,经混合离子交换树脂脱盐脱色后各成分的保留率分别为21.3%、31.4%、5.3%、3.8%。 相似文献
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影响鲜切果蔬外观品质最主要因素之一是变色。变色不仅影响鲜切果蔬外观品质,而且会影响其营养价值、风味等。本文主要概述了鲜切果蔬主要变色现象,包括褐变、黄化、白变和脱绿等,阐述了几种变色的机制及极易出现这几种变色现象的鲜切果蔬种类,同时还综述了目前控制鲜切果蔬变色的技术,主要包括化学方法(如化学护色剂处理、可食性涂膜、天然植物提取液处理等)、物理方法(如低温贮藏、热处理、气调贮藏、超声波处理等)和综合处理方法,以期为以后相关研究者提供参考借鉴。 相似文献
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Phenoloxidase (PO), pro-PO [1] and pro-PO [2], isolated from cuticular extracts of early premolt spiny lobster, resolved into doublets of molecular weights 156, 151, and 96.0, 93 kD, respectively. Trypsin-activated forms of pro-PO [1] and pro-PO [2] were 123 and 83.6 kD, respectively. Apparently melanosis of shell and hyperdermal tissue in lobsters was related to stage of molt. The pro-PO forms were activated in vitro by extracts of molting fluid which is secreted into the cuticle just before molt, and the activated PO co-migrated in SDS-PAGE with the endogenously activated PO. The molting fluid was hypothesized to be the source of the natural activator(s) of pro-PO. 相似文献
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The effects of light type, exposure and intensity, storage temperature, pH, fat content, and age and source of colorant were evaluated on stability of annatto colorants in cheese. Exposure to cool white fluorescent lighting resulted in a decrease in Hunter b values and hue throughout storage. Decreased temperature reduced the loss of a and b values after 2 days of light exposure. As time of exposure increased, reduction of a and b also increased. As pH changed from 5.4 to 4.8, b values were reduced at a faster rate than a values resulting in an intense pink color. Commercial cheese colorants extracted from annatto seeds were variable in color stability. 相似文献
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大枣多糖脱色的工业化试验 总被引:6,自引:0,他引:6
讨论了大枣多糖的脱色最佳条件,正交试验确定双氧水脱色的最佳工艺:双氧水添加量为多糖溶液体积的40%,调节pH8·8,40℃水浴4h,脱色率可达95·4%,多糖的损失率仅为4·8%。AB-8树脂脱色率可达74·48%,多糖损失率为5·6%,两种方法工艺简单,适用于工业化生产。 相似文献
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The effects of cooking temperatures, cooling rates, pH, types of emulsifying salts, age of cheese, and sources of colorant were evaluated. Annatto emulsions showed less stability during continuous heating than annatto solutions or suspensions. Increased cooking temperatures resulted in slight decreases in Hunter a and b values, and overall decreases in hue angles. Emulsifying salt blends with increased amounts of sodium citrate resulted in decreased hue angles. Process cheeses made with more than 25% colored cheese showed lower hue angles than those samples made with uncolored cheese only. Whey powder as a source of added solids in process cheese food promoted discoloration, with acid whey resulting in the most pinking. 相似文献