大豆异黄酮提取及纯化分离工艺探索

通过溶剂提取、浓缩、离心，然后进行层析分离，从大豆原料中提取及纯化分离大豆异黄酮，大豆异黄酮质量分数由原料中的0．0955％增加为提取液的0．582％，层析分离后达到8．23％，含量测定用HPCL法。     

异黄酮类化合物的微波合成及其生物活性研究

研究表明:异黄酮化合物能改善脑循环和冠脉循环,具有明显的抗缺氧和抗心律失常作用;能够诱导细胞分化,抑制癌细胞的增长;尤其是作为一种植物雌激素,可广泛用于骨质疏松症的治疗,同时又能解决绝经后妇女因预防或治疗骨质疏松而长期服用雌激素类药物可能诱发乳腺癌及子宫内膜癌的     

Effects of soy isoflavone extracts on the growth of estrogen-dependent human breast cancer (MCF-7) tumors implanted in ovariectomized nude mice

In this study, we explored the effects of soy isoflavone extracts on the growth of estrogen-dependent human breast cancer (MCF-7) tumors implanted in ovariectomized athymic mice. The ovariectomized athymic mice were implanted with MCF-7 cells. They were fed with low, moderate and high doses of soy isoflavone extracts, at dietary concentrations of 6.25, 12.5 and 25 g/kg, respectively. The expression of ki-67 was detected by immunohistochemistry. The pS ₂ expression in tumors was analyzed by real-time PCR. Estrogen level in the serum was measured by chemiluminescence enzyme immunoassay. Compared with the control group, dietary soy isoflavone extracts had a significant stimulatory effect on MCF-7 tumor growth in mice (P < 0.05). The ki-67 and pS ₂ mRNA expressions in tumors were significantly increased by 6.25 and 12.5 g/kg dose of soy isoflavone extracts (P < 0.05). And, estrogen level in serum of 6.25 and 12.5 g/kg dose groups was higher than that of control group (P > 0.05). In conclusion, in the tested dietary concentration range soy isoflavone extracts had a stimulatory effect on tumor growth. 6.25 and 12.5 g/kg doses of soy isoflavone extracts can increase the cell proliferation in tumors and induce estrogen-responsive pS2 expression. Supported by National Natural Science Foundation of China (Grant No. 30572133)     

甘草中黄豆黄苷的分离鉴定及其α-葡萄糖苷酶抑制活性

 为掌握甘草中化合物的类型及确定药效成分,对甘草中化学成分进行分析研究。采用超声波方法提取甘草,对甘草水提液进行石油醚、乙酸乙酯萃取,通过硅胶柱色谱分离乙酸乙酯萃取物,采用高效液相色谱、红外光谱、质谱、核磁共振氢谱、核磁共振碳谱进行结构分析鉴定,并对分离产物进行α-葡萄糖苷酶抑制率测定,计算IC₅₀值。经结构鉴定,从甘草的乙酸乙酯萃取物中得到1 个异黄酮类化合物黄豆黄苷。该化合物为首次从甘草属植物中得到。体外检测表明,该化合物对α-葡萄糖苷酶的IC₅₀为0.5646 mg·mL^-1,抑制活性高于对照组阿卡波糖。     

大豆异黄酮的测定方法及其评价

大豆异黄酮的测定可采用单波长法、三波长法和液相色谱法.单波长法（ y=7.431 7     

4′-氯-7-\[2-(哌嗪-l-基)乙氧基\]异黄酮的合成及分析方法的建立

为解决天然大豆苷元（daidzein,DAI）抗肿瘤活性不足的问题，对DAI的4′位和7位进行结构修饰。首先，以间苯二酚和对氯苯乙酸为起始原料，经傅克酰基化、增碳关环反应制备4′-氯-7-羟基-异黄酮，将4′-氯-7-羟基异黄酮依次与二溴乙烷、哌嗪通过取代反应制备目标化合物4′-氯-7-\[2-(哌嗪-l-基)乙氧基\]异黄酮（3-(4-chlorophenyl)-7-\[2-(piperazin-l-yl)ethoxy\]-4H-chromen-4-one,CPEO-43），采用柱层析方法实现目标产物与杂质的分离。其次，通过FT-IR，MS，¹H-NMR及¹3C-NMR确证结构。再次，通过MTT实验评价化合物CPEO-43对A549肺癌细胞和HCT116结肠癌细胞的抑制作用。最后，建立CPEO-43血浆样品的超高效液相色谱（ultra high performance liquid chromatography，UPLC）分析方法。结果表明，通过FT-IR，MS，¹H-NMR及 ¹3C-NMR确证了所合成的化合物与目标化合物结构一致。10 μmol/L DAI对A549肺癌和HCT116结肠癌细胞的抑制率分别为4.421%和5.601%；而相同浓度的CPEO-43对A549肺癌细胞和HCT116结肠癌细胞抑制率分别为58.43%和72.03%，IC₅₀值分别为2.51 μmol/L和0.87 μmol/L。建立的UPLC方法无内源性物质干扰，在0.5~10 μg/mL范围内线性关系良好，日内精密度及日间精密度均小于10%，化合物CPEO-43的低、中、高浓度的血浆样品的回收率为92.98%~100.10%。化合物CPEO-43的抗肿瘤活性显著高于DAI，UPLC分析方法能简便快速地测定血浆中CPEO-43的含量，结果准确可靠，可为提高DAI的抗肿瘤效果提供理论依据，为药物临床检测提供方法基础。