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黑豆馏油化学成分气相色谱-质谱联用分析 总被引：1，自引：0，他引：1
为研究黑豆馏油的化学成分,通过GC-MS检索,人工解析质谱与标准质谱对照的方法,鉴定黑豆馏油的化学成分.从黑豆馏油中分析鉴定了29个化学成分,确定了白色晶体的组成为碳酸氢铵和碳酸铵.实验结果为进一步分析黑豆馏油的有效成分提供了参考. 相似文献
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本文分析了油断路器的常见故障、处理方法,油断路器产生火灾及爆炸的原因。主要包括油断路器油位异常现象,试验及调整方面的原因,运行方面的原因等。 相似文献
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张益胜 《中学化学教学参考》2007,(12):34
现在,市场上的食用油种类繁多,菜籽油、色拉油、花生油、调和油、葵花籽油、玉米油、麻油等,让消费者目不暇接,不知如何选购。那么,什么样的油更好吃、更健康呢?要回答这个问题,就必须对食用油的化学成分和生产过程有个大致了解。一、食用油的营养成分食用油是甘油和各种脂肪酸所组成的甘油三酯的混合物,根据脂肪酸的成分可分为饱和脂肪酸油酯(如猪油和牛油)、单不饱和脂肪酸油酯(如菜籽油和花生油)、多不饱和脂肪酸油酯(如豆油和麻油)。有些脂肪酸人体可利用体内的糖来合成,但 相似文献
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“甜点区/段”的评价和预测是致密油勘探开发的重点和难点。致密储层甜点分类评价和开发方式的优选至关重要。为探索致密油藏有效开发方式,以南堡凹陷典型致密油富集区G断块Es33Ⅴ油组油藏为研究对象,以砂体结构和经济评价为约束,建立储层甜点分类评价标准,将储层纵向上划分为5套甜点段,平面上划分为Ⅰ、Ⅱ、Ⅲ类甜点区,其中Ⅰ、Ⅱ类为重点甜点区。通过理论研究、室内实验和矿场试验,采用长水平井大规模体积压裂衰竭开发,适时转为二氧化碳吞吐提高储量动用程度,后期通过二氧化碳重力驱提高采收率,兼顾碳驱油碳埋存“双碳”目标。力争实现南堡凹陷致密油藏的规模有效动用,同时也为致密油藏甜点分类评价和高效开发提供技术借鉴。 相似文献
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《小学阅读指南(3-6年级)》2015,(3):42
游戏DIY1准备:一个空酒瓶一瓶醋一瓶油1准备一个酒瓶子,先在里面倒上半瓶醋,然后在里面倒上半瓶油。2过一会儿,可以清楚地看到,瓶子里的液体分成了上下两层,油比醋轻,上半层是油,醋比油重,下半层全是醋。游戏中的科学这是因为醋的密度比油的大,所以醋沉在了底下。如果你先倒油,那么只需把瓶子慢慢倾斜,使得油流出来就行 相似文献
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钟远清 《中山大学学报论丛》1990,(1)
同时采用高锰酸钾法和重铬酸钾法测定河水水样的化学需氧量(COD),结果表明,用重铬酸钾法所测得的COD值较高,因此,不能把两种方法所测定的结果互相混用。 相似文献
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根据目前润滑油抗乳化性研究最新进展与国家标准,设计了创新研究型的润滑油抗乳化性能研究实验。该实验模拟实际工况条件,改变油水比,设计单次乳化以及多次连续乳化实验,除采用传统的分水率、分水速度、油水外观和界面齐整度以及乳化层厚度等抗乳化性评价指标外,还利用紫外分光光度法测定了水相含油量,利用微量水分全自动测定仪测定了油相含水量,从而对润滑油抗乳化性能进行了综合评价。此外,还可将实验内容进行拓展,通过测试油水的界面张力、界面膜强度以及乳液粒径分布和光谱稳定性来分析润滑油抗乳化性能的微观作用机制。 相似文献
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Cytotoxicity and enhancement activity of essential oil from Zanthoxylum bungeanum Maxim. as a natural transdermal penetration enhancer简 总被引：2，自引：0，他引：2
Yi Lan Qing Wu Ying-qiu Mao Qiong Wang Jing An Yan-yan Chen Wen-ping Wang Bo-chen Zhao Na Liu Ye-wen Zhang 《Journal of Zhejiang University. Science. B》2014,15(2):153-164
The aim of this present study is to investigate the effect of Zanthoxylum bungeanum oil (essential oil from Z. bungeanum Maxim.) on cytotoxicity and the transdermal permeation of 5-fluorouracil and indomethacin. The cytotoxicity of Z. bungeanum oil on dermal fibroblasts and epidermal keratinocytes was studied using an MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay. The rat skin was employed to determine the percutaneous penetration enhancement effect of Z. bungeanum oil on hydrophilic and lipophilic model drugs, i.e., 5-fluorouracil and indomethacin. The secondary structure changes of the rat stratum corneum (SC) were determined using attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR), and saturated solubilities and SC/vehicle partition coefficients of two model drugs with and without Z. bungeanum oil were also measured to understand its related mechanisms of action. It was found that the half maximal inhibitory concentration (IC50) values of Z. bungeanum oil were significantly lower in HaCaT and CCC-ESF-1 cell lines compared to the well-established and standard penetration enhancer Azone. The Z. bungeanum oil at various concentrations effectively facilitated the percutaneous penetration of two model drugs across the rat skin. In addition, the mechanisms of permeation enhancement by Z. bungeanum oil could be explained with saturated solubility, SC/vehicle partition coefficient, and secondary structure changes of SC. 相似文献
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Qian Jun-qing 《浙江大学学报(A卷英文版)》2001,2(2):209-213
Water extraction of soybean oil was studied to find the optimal conditions for recovery of oil preenriched protein and for
aqueous extraction of soybean oil. Orthogonal tests were employed in the procedures of oil pre-enrichment and aqueous extraction.
Soybeans were crushed to pass a 40 mesh sieve, soaked under the optimum conditions (solid/water=1/5(w/v), 40°C, pH 10, 3 h)
and water-ground to 100 mesh, stirred in 65 °C water for 20 min, and centrifuged at 1400 g to separate oil pre-enriched protein.
The protein yield was 17.8 g from 100 g soybeans, which contained 62.8% oil. The oil yield was 69.0%. Optimum conditions for
the aqueous extraction procedure were: solid-to-water ratio 1∶2, pH 9.0, time 30 min, stirring in boiling water bath, stationary
time 10 min, centrifuge at 3600 g for 10 min. Experimental values showed that the oil yield after aqueous extraction from
oil pre-enriched protein reached 88.3%, so the total oil extraction rate was 60.8%. 相似文献
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以花椒为样品,对不同浸泡时间提取挥发油作用的影响进行了研究。通过样品不同浸泡时间对其挥发组分个数、挥发组分检出率及挥发油提取率进行了实验。结果表明,样品浸泡时间对挥发油的提取作用有较大影响。 相似文献
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针对解决《土工试验方法标准》三轴试验中,黏性土抗剪强度指标出现的变异问题,提出一种黏性土试样组合方法,准确测定黏性土抗剪强度指标值在原有的一组相同物理性质(含水率,液塑限,级配)黏性土三轴试样的基础上,增加一组或两组相同物理性质试样,通过系统软件对试样进行完备组合,重新形成黏性土抗剪强度指标值样本基数,取其样本数的平均值为黏性土抗剪强度指标.通过试验验证了试样组合方法能有效避免三轴试验中出现的互不包容的莫尔圆,或黏聚力c出现负值试验结果,并在不增加试样数量的前提下,扩大了黏性土抗剪强度指标的样本基数,从而可准确测定抗剪强度指标值组合方法的提出为黏性土抗剪强度指标的测定提供一定的参考价值. 相似文献
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INTRODUCTION Ensuring the integrity and safe operation of oil pipelines network is critical for ensuring the trans- portation of one of the most important forms of en- ergy. An inspection vehicle, called intelligent pig, which employs ultrasonic non-destructive testing technique is often used to inspect oil transmission pipelines (Okamoto et al., 1999; Reher et al., 2002). The ultrasonic detection principle involves the fun- damental concept that a propagating wave will be reflected and/o… 相似文献