石油醚

The carbohydrate,fats,protein and amino acid content before and after leather corrosion was analyzed with the following methods:the anthrone color method and the potassium ferricyanide law,the benzine,the Kjeldahl nitrogen determination and the salicylic acid color method,the sole indicator formol titration method.

为了弄清楚霉菌对皮革侵蚀前后，皮革成分变化及其霉菌产生危害的机理，利用蒽酮比色法、石油醚萃取法、凯氏定氮法与水杨酸比色法、甲醛滴定法，分别对侵蚀前后的皮革样品中糖、脂肪、蛋白质和游离氨基酸含量进行了分析。

Proceeding from the considerations of environmental protection,we choose petroleum ether other than Freon.

从保护环境的角度出发，应放弃氟利昂，选择石油醚。

Methods Galangin was extracted with ethanol, degreased with ligarine, and extracted with chloroform.

方法采用乙醇提取，石油醚脱脂，氯仿萃取，上聚酰胺柱得到高良姜素。

Method IV is an effective process to purify the ethanol-extracts of gromwell in scale.

含水乙醇-石油醚萃取法较适于工厂生产中紫草乙醇浸膏的精制。

The contents of alt and ast in the serum were determined by chromatometry 16hr after administration of ccl4. resultsthe five kinds of extracts extracted by different heteropolarity dissolvents but ligarine extract, the free and conjugated anthraquinones significantly decreased the activities of aminopherase.

结果以不同极性溶剂提取的5种决明子提取物中，除石油醚部分外，其余各组均有显著降低转氨酶活性的作用；游离型和结合型蒽醌均有显著的降低转氨酶活性作用；决明子的生、炒两类炮制品也同样有显著的降酶作用，但生品略优。

By using this new method the optimum extraction condition was obtained as follows extraction time 19.39 hours impregnant capacity 18.90mL and percent of petroleum ether 46.26%.

结果表明，脂质提取的优化工艺条件为2.00g海藻粉、提取时间19.39h、溶剂的量18.90mL石油醚百分含量46.26%。

Use indene respectively solution of 3 ketone acetone, indene solution of 3 ketone Freon, indene solution of aether of 3 ketone oil, solution of alkyl of 3 ketone age makes indene the experiment is compared.

分别采用茚三酮丙酮溶液，茚三酮氟利昂溶液，茚三酮石油醚溶液，茚三酮庚烷溶液作试验比较。

The invention discloses a 3, 5-2-0-(4-chlorobenzene chlorobenzene)-2-deoxidising- D-red-furanoside that contains alpha body and beta body. The method includes the following steps: dissolving chlorine indicant into tetrahydrofuran, quickly adding to alcoholic solutioin, whisking and reacting, after reacting, vacuuming and steaming solvent to gain mixture of alpha body and beta body, taking separation by column chromatography to gain separated alpha body and beta body.

本发明公开了一种3、5-二-O-(4-氯苯甲酰基)-2-脱氧-D-赤-呋喃糖苷，它具有式表示的α体和式表示的β体，制备方法采用在室温下，将氯糖苷溶于四氢呋喃中，然后快速加入到醇溶液中，搅拌下进行反应；反应结束，减压蒸掉溶剂，得到白色固体，将该固体用石油醚溶解，过滤除去不溶物，再次减压蒸去溶剂，得到白色α体和β体的混合物，用柱色谱法进行分离，得到单独的α体和β体。

The compound of the invention is produced by drying 5Kg of malaytea scurfpea fruit seeds, and cold soaing and extracting for four times by 70% industrial alcohol, decompressing and concentrating lixivium to obtain alcohol extract, mixing by adding a right amount of water and extracting by using Sherwood oil and ethyl acetate.

本发明化合物是干燥补骨脂种子5Kg，用70％工业乙醇冷浸提取四次，浸出液减压浓缩得乙醇提取物，加适量水混溶，依次用石油醚、乙酸乙酯萃取。

The effects of circumfluence temperature were also studied. The result showed that it was optimal to extract motionlessly 60-mesh-sieved rubber seed for 1h using petroleum ether. The yield of solvent extraction was 10% higher than that of three or four times machine-squeezed oil.

结果表明：橡胶籽仁含油率为46.72%；从橡胶籽油的成本、操作安全和劳动生产效益考虑，在橡胶籽仁粉能过60目筛、橡胶籽仁粉与溶剂为10：75、常温常压下，以石油醚为提取溶剂、静置提取方式、提取时间1h最佳，溶剂提取橡胶籽油达35.18%，比经3～4次机械压榨提取橡胶籽油高10%左右。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。