薄荷总黄酮提取工艺研究

目的:优选薄荷中总黄酮的提取工艺。方法:以薄荷为原料,以芦丁为标准品,以乙醇为溶剂,通过正交实验对薄荷黄酮的提取进行研究,并用分光光度法测定黄酮类物质的含量。结果:影响薄荷总黄酮提取效果的主次因素为:乙醇浓度>提取时间>固液比>提取温度。结论:黄酮最佳提取工艺为乙醇浓度95%,固液比1:15,提取时间1h,提取温度80℃。     

Mentha longifolia syrup in secondary amenorrhea: a double-blind,placebo-controlled,randomized trials

Background

Amenorrhea is defined as the cessation of menses. Hormone therapy is the most common treatment. Due to the contraindications and side effects of it and the increasing demand for alternative medicine substitutes, Mentha longifolia L. was used in this study. Mentha longifolia L. is a known medication in Iranian traditional medicine to induce menstrual bleeding in women with secondary amenorrhea and oligomenorrhea.

Methods

A double-blind, randomized, placebo-controlled, multicenter study was conducted in 120 women with secondary amenorrhea and oligomenorrhea. Treatment consisted of sequential oral syrup, 45 ml (15 ml three times a day) for 2 weeks. If the patients did not have menstruation after 2 weeks of taking the medication, we would wait for two more weeks. If the patients had menstruation at each stage of using the drug, we started it one week after the end of menstruation. But if the patients had not menstruate after four weeks (two-week using of drug and waiting for two more weeks), the previous steps were repeated. The drug and placebo were repeated in three cycles of menstruation. Bleeding was documented by the patient on diary cards. The primary outcome variable was the occurrence (yes/no) of bleeding during the first treatment cycle. The secondary efficacy outcome was the regularity of bleeding pattern during the three cycles of the study.

Results

The number of women with bleeding during the first cycle were higher in the drug group as in the placebo group (68.3% vs. 13.6%; p < 0.001). The regularity of bleeding throughout the study was markedly better in the drug group compared with those given placebo (33.3% vs. 3.3%; p < 0.001). No notable complication or side effect was reported in relation to Mentha longifolia L. syrup.

Conclusion

In conclusion, Mentha longifolia L. syrup is a safe, well-tolerated, and effective choice in inducing bleeding and maintaining regular bleeding in women with secondary amenorrhea and oligomenorrhea.     

薄荷总黄酮提取工艺研究

目的：优选薄荷中总黄酮的提取工艺。方法：以薄荷为原料,以芦丁为标准品,以乙醇为溶剂,通过正交实验对薄荷黄酮的提取进行研究,并用分光光度法测定黄酮类物质的含量。结果：影响薄荷总黄酮提取效果的主次因素为：乙醇浓度〉提取时间〉固液比〉提取温度。结论：黄酮最佳提取工艺为乙醇浓度95%,固液比1：15,提取时间1h,提取温度80℃。     

灰薄荷精油化学成分研究

目的 研究灰薄荷(Mentha vagans Boriss.)精油的化学成分.方法 通过水蒸汽蒸馏法提取灰薄荷精油,并利用GC-MS对精油化学成分进行了分析.结果 从灰薄荷精油中分离鉴定出20种化学成分,占总精油的97.1％.其中含量较高的为辣薄荷烯酮氧化物(Piperitenone oxide,68.5％)、桉树脑(...     

薄荷的化学成分和临床药理作用

本文主要针对薄荷的化学成分及其临床药理作用的研究进展进行综述,为进一步开发和应用薄荷在临床应用上提供更新的科学依据。     

薄荷化学成分与药理作用研究新进展

通过对薄荷在近几年国内外化学研究、药理作用方面相关文献的查阅,以及现代临床应用等方面的研究情况进行了总结,为进一步合理开发利用薄荷提供理论依据。     

薄荷总酚酸大孔吸附树脂纯化工艺优选

目的:优选大孔吸附树脂纯化薄荷总酚酸的工艺条件.方法:以总酚酸含量和吸附-解吸率为指标,考察5种不同大孔吸附树脂对总酚酸的吸附能力,确定最佳树脂型号,并优化其纯化工艺条件.结果:选用HPD-400型大孔吸附树脂,最佳工艺条件为上样液质量浓度0.1 g·mL-1,上样液pH 3,上样量6 BV,树脂柱径高比1:9,2 BV 20％乙醇洗脱除杂,流速2BV·h-1,3 BV 70％乙醇以4 BV·h-1流速洗脱,收集洗脱液,薄荷总酚酸纯度可达53％.结论:所建立的工艺分离效果良好,操作简单,重复性好,可用于分离富集薄荷总酚酸.     

HPLC-MS/MS法同时测定薄荷药材中4种黄酮苷的含量

目的 建立HPLC-MS/MS同时测定薄荷药材中橙皮苷、香叶木苷、香蜂草苷、蒙花苷4种黄酮苷含量的方法.方法 采用Inertsil ODS-3色谱柱(4.6×150 mm,5μm),柱温30℃,流动相为甲醇-0.1％甲酸水,以0.5 mL/min的流速梯度洗脱,进样量2μL;质谱条件:采用电喷雾离子源进行正离子模式检测,多反应监测模式(MRM)用于定量测定.结果 薄荷药材中4种成分橙皮苷、香叶木苷、香蜂草苷和蒙花苷能完全分离;峰面积与浓度呈良好的线性关系.平均回收率(n=6)分别为99.40％、98.63％、99.08％、98.62％,RSD分别为2.5％、2.7％、2.6％、2.4％.结论 该方法简便、快速、准确、专属性高,适用于薄荷药材中橙皮苷、香叶木苷、香蜂草苷、蒙花苷含量的同时测定.     

Two new lignans from Mentha spicata L.

Two new lignans named spicatolignan A (1) and spicatolignan B (2) have been isolated from the whole herbs of Mentha spicata L.