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Zhihui Zhao Hui Dai Xiangmei Wu Haitao Chang Xiaoming Gao Mengjun Liu Pengfei Tu 《Chemistry of Natural Compounds》2007,43(4):374-376
A pectic polysaccharide was isolated from the fruits of Ziziphus jujuba Mill. cv. jinsixiaozao Hort. and its structure was characterized by acid hydrolysis, methylation, and NMR spectroscopies.
The purified fraction Ju-B-7 had a molecular mass of over 2000 kDa. Chemical and spectroscopic analyses indicated that Ju-B-7
is composed mainly of α-1,4-linked D-galactopyranosyluronic acid and 1,2-linked L-rhamnose with a molar ratio of 8.1:1. It can significantly stimulate
spleen cell proliferation in vitro (P<0.01, 10 μmg/mL).
Published in Khimiya Prirodnykh Soedinenii, No. 4, pp. 311–312, July–August, 2007. 相似文献
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CHEN Wen-Sen South China Institute of Botany Chinese Academy of sciences Guangzhou Guangdong ChinaYAO Zhu-Jun ZHANG Yi-Bin XU Yong-Zhen WU Yu-LinState Key Laboratory of Bio-organic & Natural Products Chemistry Shanghai Instutute of Organic Chemistry Chinese Academy of Sciences Fenglin Lu Shanghai China 《中国化学》1995,13(3):263-266
Atemoyacin A, a new annonaceous acetogenin was isolated from the alcoholic extract of the seeds of Annona atemoya Hort (Annonaceae). Its structure and relative configuration were elucidated on the basis of the spectral analysis. 相似文献
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川芎中有毒重金属元素镉含量超过国家GAP标准,严重影响其出口创汇,也成为制约川芎走向现代化和国际化的瓶颈。介绍了目前对川芎的消化及重金属元素镉的检测方法,并对各方法的利弊进行了分析,从而为准确、高效地检测药材中重金属元素镉的含量提供了有力的参考依据。 相似文献
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川芎和抚芎的多糖和重金属含量分析 总被引:3,自引:1,他引:3
为提高川芎质量,控制重金属含量,采用苯酚-硫酸法测定了川芎和抚芎中的多糖含量,采用原子吸收光谱法测定了其中重金属含量。结果表明,川芎和抚芎多糖含量分别为(25.35±0.23)和(23.52±0.51)mg/g,重金属铅、汞、镉的含量分别为(1.28±0.12)、(0.21±0.22)、(0.25±0.11)μg/g和(2.24±0.21)、(0.16±0.22)、(0.35±0.20)μg/g。苯酚-硫酸法简单、快速、准确度高,重现性好,用于测定川芎和抚芎多糖结果可靠。川芎汞含量有一定超标,抚芎镉含量超标,应引起注意。 相似文献
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A GC-MS fingerprinting technique based on the essential oil components has been developed for the discrimination of chuanxiong against Chinese Angelica (Angelica sinensis (Oliv.) Diels) or other herbs with similar compositions. The analytical performance of four different extraction methods for the separation of essential oil components have been compared and these include: ultrasound-assisted extraction (UAE), supercritical fluid extraction (SFE), Soxhlet extraction (SHE) and hydro-distillation extraction (HDE). The results showed that UAE was the most effective extraction method, and the operational parameters of UAE were optimized. 3-Butylphthalide, Z-butylidenephthalide, senkyunolide I, senkyunolide H, E-butylidenephthalide, senkyunolide A, neocnidilide, Z-ligustilide and E-ligustilide were tentatively identified in chromatograms of chuanxiong based on their GC-EI-MS data. Similarity coefficient calculations based on correlation methods have been performed on the GC-MS fingerprints. Using an authentic standard Chuanxiong as the reference, the similarity coefficients between the standard and all other chuanxiong samples ranged from 0.90 to 1.0 (with 1.0 being the perfect match), which as a group can be readily separated from the Angelica samples for which the similarity index against the chuanxiong standard ranged from 0.75 to 0.77. Conversely, when an authentic Angelica standard was used as the reference, the respective similarity coefficients fall in the range of 0.70-0.75 and 0.98-1.00 for the chuanxiong and Angelica sample groups. Our results thus demonstrate that the fingerprinting technique developed in the study can indeed discriminate the two herbs with high reliability. 相似文献
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优化了舒胸片处方中红花与川芎超声提取工艺.以红花中羟基红花黄色素A (Hydroxysafflor yellow A.HsYA)、川芎中阿魏酸(Ferulic acid,FA)的提取率为考察指标,应用正交试验,考察乙醇浓度、物料比、超声时间和超声次数对提取效果的影响.最终得到川芎和红花药材提取工艺如下,加入12倍50%乙醇超声提取2次,每次30min,能最大限度的提取红花与川芎药材中的有效成分.建立的优化工艺能有效克服川芎、红花药材有效成分热不稳定的缺点,提取转移率较高,可为工业生产提供参考. 相似文献
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Optimization of an accelerated solvent extraction dispersive liquid–liquid microextraction method for the separation and determination of essential oil from Ligusticum chuanxiong Hort by gas chromatography with mass spectrometry 下载免费PDF全文
In this study, an accelerated solvent extraction dispersive liquid–liquid microextraction coupled with gas chromatography and mass spectrometry was established and employed for the extraction, concentration and analysis of essential oil constituents from Ligusticum chuanxiong Hort. Response surface methodology was performed to optimize the key parameters in accelerated solvent extraction on the extraction efficiency, and key parameters in dispersive liquid–liquid microextraction were discussed as well. Two representative constituents in Ligusticum chuanxiong Hort, (Z)‐ligustilide and n‐butylphthalide, were quantitatively analyzed. It was shown that the qualitative result of the accelerated solvent extraction dispersive liquid–liquid microextraction approach was in good agreement with that of hydro‐distillation, whereas the proposed approach took far less extraction time (30 min), consumed less plant material (usually <1 g, 0.01 g for this study) and solvent (<20 mL) than the conventional system. To sum up, the proposed method could be recommended as a new approach in the extraction and analysis of essential oil. 相似文献