共查询到20条相似文献，搜索用时 125 毫秒
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本实验对西藏大蒜晒制干粉提取大蒜素进行了三种常规提取和超临界提取的比较实验,并对未经提取的大蒜干粉、提取物、超临界CO2提取剩余干粉进行了大蒜素的含量检测.结果表明:(1)大蒜晒制干粉中每克干粉含活性成分(含硫化合物)0.0341g,超临界CO2萃取后的大蒜干粉中每克干粉含大蒜素为0.77g,超临界CO2萃取的效率理论值为77.6%,(2)超临界CO2萃取实验中实际得到的大蒜素远低于理论值,只有0.0012g每克大蒜干粉,其原因可能是超临界系统容积大损耗大;(3)通过水煮-有机溶剂萃取法、有机溶剂浸泡提取法以及乙醇浸泡提取法三个实验的比较,表明,无论在大蒜油得率、大蒜素纯度以及大蒜素含量方面,水煮-有机溶剂萃取法均比其他两种方法有优势,乙醇浸泡提取法大蒜粗提物多,杂质含量也很最高. 相似文献
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选用１０种常用食品香料与罂粟壳混合,经酸化加热水解,碱化等步骤后,用常法萃取和搅拌透析,提取罂粟壳残留物进行了比较,薄层层析定性定量的结构表明,常法萃取下罂粟残留提取完全,可达９７％－９８％以上,检出含吗啡,可待因等５个组分。结果也表明了二种提取方法均不影响多种香料共存时罂粟壳中残留的吗啡,可待因组分的检出。 相似文献
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研究沙棘果实中总黄酮的最佳提取工艺。方法:采用正交试验的方法,选择乙醇浓度,料液比,提取时间,提取次数,进行四因素三水平的正交试验。结果:用60%乙醇回流提取3次,每次1小时,温度为75℃,料液比为1∶8(W/V)。结论:该提取工艺为沙棘果实中总黄酮的最佳提取工艺。 相似文献
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根据多糖溶于水而不溶于乙醇的性质,用乙醇作为沉淀剂对北五味子多糖进行提取,所提取的多糖总伴有蛋白类物质的存在,可用Sevage法将其除去,结果表明提取的平均含量为6．57％,且方法简便。 相似文献
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BackgroundJuglone is a naphthoquinone currently obtained by chemical synthesis with biological activities including antitumor activity. Additionally, juglone is present in the green husk of walnut, which suggests evaluating the effect of GH extracts on carcinogenic cell lines.ResultsWalnut green husk ethanolic extract was obtained as 169.1 mg juglone/100 g Green Husk and antioxidant activity (ORAC) of 44,920 μmol Trolox Equivalent/100 g DW Green Husk. At 1 μM juglone in HL-60 cell culture, green husk extract showed an antiproliferative effect, but pure juglone did not; under these conditions, normal fibroblast cells were not affected. A dose-dependent effect on mitochondrial membrane potential loss was observed. Apoptosis of HL-60 was detected at 10 μM juglone. Despite high ORAC values, neither purified juglone nor the extract showed protective effects on HL-60 cells under oxidative conditions.ConclusionsGreen husk extract generates an antiproliferative effect in HL-60 cells, which is related to an induction of the early stages of apoptosis and a loss of mitochondrial membrane potential. The normal cells were not affected when juglone is present at concentrations of 1 μM, while at higher concentrations, there is loss of viability of both cancerous and healthy cells.How to cite: Soto-Maldonado C, Vergara-Castro M, Jara-Quezada J, et al. Polyphenolic extracts of walnut (Juglans regia) green husk containing juglone inhibit the growth of HL-60 cells and induce apoptosis. Electron J Biotechnol 2019;39. https://doi.org/10.1016/j.ejbt.2019.02.001. 相似文献
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Jerry Joseph Emanuel Dickson M. B. Kadam P. K. Joseph 《Indian journal of clinical biochemistry : IJCB》1991,6(1):27-29
Rats were fasted for 8 hours and then fed 3 ml of 25% (v/v) ethanol per 100g body weight and subsequently sacrificed 18 hours
later. The levels of triacylglycerols and total cholesterol were significantly raised in serum and liver of alcohol fed rats.
However, when rats were fed on aqucous extract of onions (300 mg per 100g body weight) with 25% ethanol, no rise in serum
and liver lipids was observed. Alcohol fed to the fats with or without onion extract had no effect on serum, AST, ALT and
alkaline phosphatase levels. The increase in serum urea in ethanol-fed rats was not altered in rats fed a mixture of alcohol
and onion extracts. Values of liver MDA was lower in rats fed ethanol with or without onion extract compared to controls.
Onion extract seemed to show a hypolipidemic effect in alcohol fed rats. 相似文献
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M. I. Akpanabiatu I. B. Umoh E. O. Udosen A. E. Udoh E. E. Edet 《Indian journal of clinical biochemistry : IJCB》2005,20(2):29-34
Aqueous extract of the leaf and root ofNauclea latifolia Sm. (Rubiaceae) is used in Nigerian folk medicine for the treatment of hypertension. This work is carried out to investigate
the effect ofNauclea latifolia leaf extract on lipid profile and cardiovascular activity of rats. Normal and 10% coconut oil fed rats were treated with
the water-soluble fraction of the ethanol extract ofNauclea latifolia leaf for 2 weeks. Forty-eight mature male albino rats of the Wistar strain were divided into two experiments of four groups,
each group having 6 animals. Experiment I animals were treated with the water-soluble fraction of the ethanol extract whilst
experiment II animals were fed 10% coconut oil meal before treatment with the water-soluble fraction of the ethanol extract.
A single oral dose ofNauclea latifolia was 170, 340 and 510 mg/kg body wt/day of the extracts respectively for 2 wks. There was no significant change in the lipid
profile of the experimental animals as compared with the controls. There was about 40% relaxation on contracted thoracic aorta
that was pre-contracted with 2 μM phenylephrine. The viability of the tissue was tested against 10 μM of acetylcholine. There
was no significant (P>0.05) change in Na+ concentration in the serum. However, the K+ concentration in the serum of the experimental animals showed a significant increase. The study shows that ethanol extract
ofNauclea latifolia has vasodilator action on the aorta and that lipid profiles of experimental rats were not affected. Furthermore, the increase
in the K+ may be contributing to the vasodilator effect ofNauclea latifolia. 相似文献
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Arun Ray Susri Ray Chaudhuri Biswajit Majumdar Sandip K. Bandyopadhyay 《Indian journal of clinical biochemistry : IJCB》2002,17(2):44-51
Oral administration of ethanol extract of the rhizome ofPirorhiza kurroa at a dose of 20mg/kg body weight, for 10 consecutive days, was found to enhance the rate of healing on Indomethacin-induced
gastric ulcer in rats, compared to the ulcerated group without treatment. The level of peroxidised lipid, in terms of thiobarbituric
acid reactive species (TBARS), in gastric tissue, was increased in ulcerated rats which was restored to near normalcy on treatment
with ethanol extract. The specific activity ofin vivo antioxidant enzymes, viz SOD and catalase and total tissue sulfhydryl (thiol) group, which were markedly decreased in ulcerated
group, were found to be significantly elevated (p<0.05), on treatment with the above extract, at the specified dose, compared
to the indomethacin—induced ulcerated group without any supporting treatment. The present study thus suggests that the ethanol
extract of rhizome ofPicrorhiza kurroa, at the dose of 20mg/kg body weight, accelerated the healing of stomach wall of indomethacin induced gastric ulcerated rats
by anin vivo free radical scavenging action. 相似文献
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自青霉素菌菌种应用于青霉素生产以来，米孢子的制备一直是青霉素发酵生产的一个重要环节。我们现行工艺生产青霉菌米孢子时，因其补充氮源的不足，导致孢子质量下降长势偏弱，影响了青霉素发酵生产。我们经定性分析与大量实验数据表明，利用F—蛋白作氮源更有利于孢子的形成和生产种子内在质量的提高。最终提高发酵生产菌的生产能力。 相似文献
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探索催化剂的最佳制备条件及合成反应的最佳工艺条件,从而使C02和乙醇反应合成乙酸乙酯具有较高的选择性和收率。结果表明：用氢氧化钠作沉淀剂,采用共沉淀法制备Cu／Zn／A1／Co催化剂,沉淀时PH值为11,Cu、Zn、AI物质的量之比为9：8：15,加入Co的量为Cu、Zn、Al物质量总和的15％时制备所得的催化剂活性最好;在反应温度400℃,反应压力0．6MPa,乙醇与二氧化碳进料体积比为1：150,乙醇进料速度为0．3mL／min时合成反应最佳,此时乙醇的转化率为53．33％,乙酸乙酯的产率为9．77％,乙酸乙酯的选择性为18．33％。 相似文献
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Vishnu Kumar A. K. Khanna M. M. Khan Ranjana Singh Sushma Singh Ramesh Chander Farzana Mahdi J. K. Saxena Shweta Saxena V. K. Singh R. K. Singh 《Indian journal of clinical biochemistry : IJCB》2009,24(1):65-69
The present study was carried out to evaluate the hypoglycemic, lipid lowering and antioxidant activities in root extract
of Anthocephalus indicus (A indicus) in alloxan inducd diabetic rats. Oral administration of ethanol extract of root (500mg/
kg body weight) for 21 days resulted in significant decrease in the levels of blood glucose, triglycerides, total cholesterol,
phospholipid and free fatty acids. Furthermore, the root extract (100–400μg) inhibited the generation of superoxide anions
and hydroxyl radicals, in both enzymic and non-enzymic systems, in vitro. The result of the present study demonstrated hypoglycemic,
lipid lowering and antioxidant activities in root extract of A indicus, which could help in prevention of diabetic dyslipidemia
and related diseases. 相似文献
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Subbiah Pugazhenthi P. Suryanarayana Murthy 《Indian journal of clinical biochemistry : IJCB》1995,10(1):19-22
A new method was developed to purify partially an orally active hypoglycemic fraction from the unripe fruits ofMomordica charantia Linn. The residue after centrifugation of the fruit juice was extracted with ethanol and the concentrated ethanolic extract was further extracted with diethyl ether. In normal rabbits after oral administration, the ether extract at a dose of 0.75 g/kg body wt decreased the fasting blood glucose by 26% (P<0.01). It was compared with charantin, the isolation procedure of which led to loss of hypoglycemic activity many times. Our new method of isolation is simple and the hypoglycemic effect is retained more consistently after purification. 相似文献
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目的:以白桦树皮为原料,研究了白桦树皮中白桦脂醇提取和纯化的工艺,并使此工艺适合药用放大生产。方法:使用乙醇提取,使用乙酸乙酯和不同浓度的乙醇进行精制。结果:所得到的精制品经过高效液相检验含量在98%以上。结论:白桦脂醇的提取纯化过程中使用的都是常规的可操作方法,适合放大生产。 相似文献
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《Electronic Journal of Biotechnology》2014,17(1):14-18
BackgroundAlgae offer many advantages as biofuel sources including: high growth rates, high lipid content, the ability to grow on non-agricultural land, and the genetic versatility to improve strains rapidly and produce co-products. Research is ongoing to make algae biofuels a more financially attractive energy option; however, it is becoming evident that the economic viability of algae-based fuels may hinge upon high-value co-products. This work evaluated the feasibility of using a co-product, algae extract, as a nutrient source in cell culture media.ResultsAlgae extract prepared from autolysed Chlamydomonas reinhardtii was found to contain 3.0% protein, 9.2% total carbohydrate, and 3.9% free α-amino acid which is similar to the nutrient content of commercially available yeast extract. The effects of algae extract on the growth and metabolism of laboratory strains of Escherichia coli and Saccharomyces cerevisiae were tested by substituting algae extract for yeast extract in LB and YPAD growth media recipes. Complex laboratory media supplemented with algae extract instead of yeast extract showed markedly improved effects on the growth and metabolism of common laboratory microorganisms in all cases except ethanol production rates in yeast.ConclusionsThis study showed that algae extract derived from C. reinhardtii is similar, if not superior, to commercially available yeast extract in nutrient content and effects on the growth and metabolism of E. coli and S. cerevisiae. Bacto™ yeast extract is valued at USD $0.15–0.35 per gram, if algae extract was sold at similar prices, it would serve as a high-value co-product in algae-based fuel processes. 相似文献