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ChengBinCUI ChiXU QianQunGU ShiDongCHU HaiHongJI GangJING 《中国化学快报》2004,15(10):1191-1194
26-O-β-D-Glucopyranosyl-furost-5(6),20(22)-dien-3β,26-diol 1, a new furostanol saponin, was isolated from the water-extract of Dioscorea nipponica Mak., the raw material of a traditional Chinese herbal medicine Wei Ao Xin. The structure of 1 was determined on the basis of its spectral data especially by NMR spectroscopy. The result provides the first example of naturally occurring furostanol saponins with a single saccharide chain at the C-26 position. 相似文献
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罗媛媛 《浙江大学学报(理学版)》1998,25(3):81-84
本文测定了 5 种温度条件下日本医蛭的耗氧量和耗氧率.结果表明: 各种温度条件下, 日本医蛭耗氧 量与体重均呈极显著的线性回归关系. 20℃和 25℃时日本医蛭耗氧率与体重均呈倒数回归关系,相关性 也极为显著.求出了耗氧量 X0(μ l ·h-1) 、耗氧率 Q0(μ l ·mg-1·h-1)与体重 W(mg)、温度 T 的二元回归方 程,方程为: X0=-10. 6274+0. 0500W+0. 6135T ,Q0 =0. 0325-0. 00014W +0. 0031T .由此建议, 人工 饲养时,在溶解氧较少( 1~ 2mg·h-1)的水体中,每 m3 养殖 0. 5g~ 1. 0g 的成蛭 5000~ 10000 条. 相似文献
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Three new pteridines, hirudinoidines A – C ( 1 – 3 , resp.), with novel structural features were isolated from Hirudo nipponica Whitman , and their structures were elucidated on the basis of extensive spectroscopic analyses and by comparison of their spectral data with those of related metabolites. The configuration of 1 was unequivocally confirmed by single‐crystal X‐ray diffraction (Fig. 2). 相似文献
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利用超临界CO2萃取技术从穿山龙中提取薯蓣皂甙元,建立了反相高效液相色谱法测定穿山龙中薯蓣皂甙元的方法.采用Shim-pack CLC-ODS(150 mm×4.6 mm,5 μm)色谱柱,流动相为V(甲醇):V(水)=99:1,流速为1.0mL/min,UV检测波长为206 nm.在0.2~2.0 mg/mL范围内,薯蓣皂甙元峰面积与其质量浓度呈良好的线性关系,r=0.9997.进行了高、中、低3个不同浓度的加标回收率测定,相应的回收率分别为101.5%,99.88%,98.45%,平均值99.94%,RSD为1.7%. 相似文献
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