共查询到20条相似文献,搜索用时 78 毫秒
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针对含水醇类、较高温度和较小料液比时以粉末磷脂为原料浸出醇溶性磷脂,浸出过程中常有磷脂分散不好的情况,采用分散剂分散粉末磷脂来提高醇溶性磷脂的传质效率,考察了不经分散剂分散和经分散剂分散的磷脂浸出动力学行为,并分别得到了它们的动力学方程:-dq/dt=0.00719e -0.055t(不加分散剂),-dq/dt=0.00491e -0.0742t(砂-100为分散剂),-dq/dt=0.02208e-0.0522t(糊精为分散剂).研究结果表明,经分散剂分散的磷脂可大大提高醇溶性磷脂的浸出速率和有效浸出时间. 相似文献
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花生磷脂制取工艺的研究 总被引:1,自引:0,他引:1
对花生磷脂的制取工艺进行研究,研制出高等级的花生磷脂产品.花生油的生产采用静电处理和冷冻过滤等工艺,得到质量较好的、不含水的毛磷脂胶质副产品,采用超临界萃取技术对毛磷脂进行提纯,利用二氧化碳在临界高压下对非极性的油类具有溶解性而对极性的磷脂难以溶解的特性,达到将磷脂从含油胶质中提取分离的目的.磷脂产品外观为淡黄色,磷脂质含量大于90%. 相似文献
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Antonia Heredia Ana Jiménez Rafael Guillén Juan Fernández-Bolaños 《Zeitschrift für Lebensmitteluntersuchung und -Forschung A》1996,202(3):228-232
A comparative study of methods for isolating cell wall material from olives (variety Hojiblanca) was performed. Treatment with cold (T-1) or hot (T-2) ethyl alcohol was followed by extraction into cold or hot water (water-soluble fraction). The insoluble residues were delignified. Hemicelluloses A and B were isolated and the neutral sugar composition and protein content of the different fractions were determined. In the delignified fractions following treatments T-1 and T-2, hemicelluloses A were composed of 87.35% and 87.37% xylose, respectively, indicating the presence of a pure xylan. In the non-delignified fraction, the content of hemicelluloses B was higher than in the delignified fraction and its predominant sugar was glucose, although significant amounts of xylose, galactose and arabinose were also found. The study suggests that treatment T-1 gives better results than T-2 and that a higher degree of purification of hemicelluloses A is obtained from the delignified cell wall material, as well as a decrease in the proteins bound to the fractions. 相似文献
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The biological activities of Angelica gigas Nakai can be improved using water extraction at 60°C with ultra-sonication. Conventional water extraction at 100°C can destroy heat labile active compounds in medicinal herbs. A high frequency (200 kHz) (actual intensity, 210 W/m2) minimally affected the extraction yield at 40°C. A low frequency (40 kHz) (50 W/m2) at 60°C produced better results. A. gigas Nakai extracts produced using a low frequency showed a 50% increase in human immune cell growth and IL-6 secretion, compared to conventional water extraction extracts. Extracts produced using 40 kHz and 60°C produced more immune B and T cell growth than 40°C extracts. These results were confirmed using similar HPLC chromatogram peak patterns at input intensities of 50 and 210 W/m2. A better than 50% extraction yield and cytokine secretion increase, and better immune cell growth, was achieved in ultrasonication extracts produced at low temperatures. 相似文献
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简述了超声波作用的基本原理,综述了超声波技术在天然产物活性物质提取中的应用情况,得出了超声波技术提取天然产物活性物质有着提取率高、速度快且不改变有效成分等优点。讨论了超声波提取中应注意的问题。 相似文献
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超声波技术在天然产物提取中的应用 总被引:9,自引:0,他引:9
简述了超声波作用的基本原理,综述了超声波技术在天然产物活性物质提取中的应用情况,得出了超声波技术提取天然产物活性物质有着提取率高、速度快且不改变有效成分等优点。讨论了超声波提取中应注意的问题。 相似文献
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不同的提取工艺对鸡骨素出品率的影响 总被引:5,自引:1,他引:5
通过正交试验,研究了不同工艺参数对鸡骨素出品率的影响.结果表明:提取温度为135℃,提取时间为60min,在4min之内将压力从0.32MPa降至0.10MPa,然后继续升温,每35min泄压一次,即在60min的时间内泄压一次半(第二次泄压完后不再升温,直接压抽)时,鸡骨素出品率能够达到最好的水平. 相似文献
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《食品与发酵工业》2019,(11):268-273
海洋磷脂因其独特的结构和生物活性引起人们的关注。海洋磷脂广泛存在于水产品中,由于多不饱和脂肪酸含量高,在加工和储运过程中易发生脂质氧化反应、非酶促褐变反应等,这一系列反应生成的产物一方面引起水产品的酸败,降低食品的品质;另一方面适当的磷脂氧化,提供了脂质来源的风味前体物质,是水产品特征香气物质产生的关键。在水产品的挥发性风味物质中已鉴定出醇、醛、2-戊基呋喃、苯甲醛等特征香气成分,此类风味物质的形成来源于脂质氧化以及非酶褐变等反应,受这些反应共同作用的影响,形成了食品独特诱人的品质和风味。该文综述了海洋磷脂氧化及其在食品风味中的作用,为深入理解食品特征风味物质形成提供参考。 相似文献