Influence of Dietary Isoflavonoids on Stability of Egg Yolk Lipids

An experiment was conducted to investigate the influence of dietary tea polyphenol (TP) and daidzein (DA) on lipid stability of egg yolk. Two-hundred and seventy 27-week-old Hisex Brown laying hens were divided into nine groups, fed a diet supplemented with 0, 5, 10, 20, 40 mg kg-1 TP and 5, 10, 20, 40 mg kg- 1 DA respectively for a period of 8 weeks ad libitum. The dietary addition of TP and DA both could reduce egg yolk LPO content significantly at the end of 4-week experiment (P ＜ 0.05) and keep egg yolk lipid stable at the supplemental dose of 10 mg kg- 1 diet respectively. A significant liner reduction in egg yolk LPO content was found with the increasing of dietary TP and DA. The egg yolk LPO content was decreased by 23.1 and 27.0% (P＜ 0.05) with the supplementation of TP and DA respectively at 40 mg kg-1 diet. The LPO contents in liver, plasma and egg yolk were decreased significantly with the dietary addition of TP or DA respectively ( P ＜ 0.05). There was no significant difference between the effects of TP and DA on improvement of layers‘ antioxidative capacity. The dietary TP and DA both could improve the bird‘s antioxidative level directly irrelevant to SOD and GSH-Px actiVities.     

New constituents from Gliricidia sepium

The heart wood of Gliricidia sepium stem yielded stigmastanol glucoside (1) and 3',4'-dihydroxy-trans-cinnamic acid octacosylester 2, along with three other known constituents.     

超声-微波辅助提取葛根异黄酮工艺研究

[目的]探讨超声-微波辅助技术提取葛根异黄酮的最佳工艺条件。[方法]以乙醇作为提取溶剂,句容葛根作为原料,通过采用超声-微波辅助技术进行提取,以异黄酮得率为指标,考察微波功率、提取时间、料液比等因素对提取效果的影响,确定最佳的提取工艺参数。[结果]超声-微波辅助技术提取葛根异黄酮的最佳工艺条件为:提取时间31.2 min,料液比1∶30 g/ml,微波功率98 W,超声功率50 W,在此条件下,葛根异黄酮得率为8.92%。[结论]超声-微波提取法不仅缩短了提取时间,而且提高了葛根异黄酮的得率,是一种适合葛根异黄酮的高效提取方法。     

大孔树脂纯化葛花总异黄酮的工艺条件研究

以葛花总异黄酮含量及回收率为考察指标,选用大孔树脂对葛花总异黄酮进行分离纯化。结果表明,X-5树脂对葛花总异黄酮有较好的吸附和解吸效果,最佳工艺条件为:洗脱剂为70%乙醇;洗脱剂用量为3倍树脂体积;流速为2 mL/min;葛花总异黄酮上样液的质量浓度为2 mg/mL,速率为2 mL/min;冲洗杂质用水体积为20 mL。试验表明,该法简单可行,分离效果好,经X-5处理后的葛花异黄酮含量可达54%。     

类黄酮对蛋鸡脂类代谢的影响

270只31周龄海赛克斯褐壳蛋鸡，随机分为9个处理。试验2－5组日粮分别添加5mg/kg、10mg/kg、20mg/kg、40mg/kg茶多酚，试验6－9组日粮分别添加5mg/kg、10mg/kg、20mg/kg、40mg/kg大豆黄酮。试验为期8周。研究茶多酚（多酚类黄酮）、大豆黄酮（二酚类黄酮）对蛋鸡生产性能的影响，并从脂类代谢角度探讨类黄酮对蛋鸡的作用柚是及其可能的作用途径。结果表明：（1）茶多酚和大豆黄酮均显著地降低蛋黄甘油三酯，降低最大幅度分别为14.7%和16.7%（P＜0.05）。（2）40mg/kg茶多酚或10mg/kg大豆黄酮有降低血浆总胆固醇、甘 一酯、LDL－C的趋势。（3）茶多酚和大豆黄酮均显著升高了蛋鸡血浆雌二醇和胰岛素的水平。（4）茶多酚和大豆黄酮有提高产蛋率的作用，尤其添加10mg/kg大豆黄酮，产蛋率显著提高7.2%（P＜0.05）。     

合水粉葛根异黄酮含量分布与组成的HPLC指纹图谱

[目的]研究合水葛根异黄酮含量的HPLC指纹图谱,为合理开发利用其资源提供理论依据。[方法]采用高效液相色谱法,以葛根素为标准品,对合水粉葛块根的头、中、尾、表皮、皮下部分和须根的总异黄酮、葛根素含量和异黄酮成分构成进行了分析研究。[结果]合水粉葛块根表皮的总异黄酮和葛根素含量都高于皮下部分,块根尾部总异黄酮和葛根素含量较头部和中部低;须根的总异黄酮含量高于块根,但须根中葛根素占总异黄酮含量的比例低于块根,并且存在一种含量仅次于葛根素的未知异黄酮物质。[结论]合水粉葛块根不同部分和须根的总异黄酮、葛根素含量和异黄酮成分构成不同。     

蚜虫取食和机械损伤对大豆真叶中异黄酮的诱导作用

采用高效液相色谱法,通过测定大豆真叶异黄酮含量的变化,探讨大豆蚜虫取食和机械损伤与大豆真叶异黄酮含量之间的化学诱导关系。结果表明:蚜虫取食诱导的异黄酮合成反应速度较快,而机械损伤处理诱导的异黄酮合成反应速度相对较慢;蚜虫取食引起大豆真叶内大豆黄素和染料木素苷元含量的同时增加,而机械损伤处理提高黄豆黄素苷元含量却降低了大豆黄素苷元含量;蚜虫取食能在相当长的时间内维持异黄酮含量的增加,而机械损伤处理只能在短时间内引起异黄酮含量的变化。因此,蚜虫取食和机械损伤处理所诱导的异黄酮含量变化的规律不同,蚜虫取食和机械损伤所诱导的大豆抗性不是完全对等的。     

外源茉莉酸对大豆异黄酮的影响

摘下生长8天的大豆子叶,在不同浓度茉莉酸溶液中浸泡一定时间,用甲醇提取大豆异黄酮,经高压液相色谱(HPLC)测定,研究子叶表面伤口、浸泡时间以及茉莉酸浓度对大豆异黄酮的影响.结果显示:在对照组(0.1%乙醇),子叶表面的伤口不影响异黄酮的分配比例;而用茉莉酸浸泡组,健康子叶中几乎不存在游离型的大豆甙元和染料木黄酮;丙二酰大豆甙和丙二酰染料木甙所占比例随着浸泡时间的延长而下降,大豆甙元和染料木黄酮所占比例随浸泡时间的延长而增加,大豆甙和染料木甙所占比例不随浸泡时间而变化;20μM茉莉酸溶液浸泡的子叶中异黄酮总量最低.     

Polyprenylated isoflavanone and isoflavonoids from Ormosia henryi and their cytotoxicity and anti-oxidation activity

A rare naturally-occurring polyprenylated isoflavanone, designated ormosinol (1), and a new isoflavonoid glycoside, named ormosinoside (2), along with 21 known compounds were isolated from the root bark of Ormosia henryi Prain. The structures of compounds 1 and 2 were determined as 5,7,2′,4′-tetrahydroxyl-6,8,5′-tri-(γ,γ-dimethylallyl)isoflavanone and isoprunetin-7-O-β-d-xylopyranosyl-(1 → 6)-β-d-glucopyranoside on the basis of a combination of 1D-, 2D-NMR and mass spectroscopic measurements. Compound 1 showed significant anti-oxidation activity against DPPH radicals (IC₅₀ 28.5 μM) and cancer cell line (A549, LAC, and HepG2) growth inhibitory activity with IC₅₀ ranging from 4.25 to 7.09 μM, while compound 2 found to be inactive to both testing systems.