排序方式: 共有7条查询结果,搜索用时 15 毫秒
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优化了黄皮叶中提取生物碱的工艺条件。在超声波辅助条件下,采用响应面分析法,以超声时间(A)、料液比(B)、溶媒浓度(C)等为主要影响因素,获得最佳提取工艺条件。结果表明:在超声时间49 min,料液比1∶14,溶媒浓度5.67%的条件下,黄皮叶中生物总碱的提取率为:0.3560%。最佳提取工艺条件可用于指导生产中黄皮叶生物总碱的提取,其超声时间(A)、料液比(B)、溶媒浓度(C)等对生物总碱提取率的相互影响关系式为:Y=-1.31604+0.047721A+0.0377930B+0.083515C-1.85000E-005AB-1.24000E-004AC-4.46000E-004BC-4.73500E-004A2-1.25900E-003B2-6.27200E-003C2。 相似文献
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A reliable ultrasound-assisted extraction (UAE) method combined with HPLC-UV for quantification of eight active alkaloids in fruits of Macleaya cordata (Willd) R. Br. was developed. The optimization conditions of UAE were obtained by using Box-Behnken design of response surface methodology. Chromatography was carried out using a Kromasil C18 column by gradient elution with 0.1% phosphoric acid aqueous solution for HPLC-UV. All calibration curves showed good linear correlation coefficients (R2>0.999 6) and recoveries (from 97.3% to 104.9%) were acceptable. l,l-diphenyl-2-picrylhydrazyl (DPPH) method was employed to test the antioxidant activity of the extract from the samples. The proposed method was successfully applied to quantifying eight components in nine samples of M.cordata, and significant variations of alkaloid contents and antioxidant activity of the samples from different habitats were demonstrated. It presents a powerful proof for the selection of the best sources to extract eight kinds of alkaloids. 相似文献
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马来海松酸系列衍生物的合成 总被引:6,自引:1,他引:5
用松香和马来酸酐合成了马来酐海松酸,马来酐海松酸分别与对甲基苯脲(Ⅱa)、苯脲(Ⅱb)、对氯苯脲(Ⅱc)在熔融下直接化合生成相应的N-(取代苯氨基氧代甲酰基)马来海松酰胺酸Ⅲa、Ⅲb和Ⅲc,产率分别为91%、93%和90%;马来酐海松酸与SOC l2反应得到马来海松酸酰氯(Ⅳ),Ⅳ与KSCN、苯胺反应生成松香马来酸单硫脲(Ⅴ),产率为37%;Ⅳ与水合肼、水杨醛反应生成松香马来酸二酰腙(Ⅵ),产率为73%。所得终产物均经元素分析、红外、核磁共振进行了表征。 相似文献
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