Extraction and separation of total flavonoids from Flos Puerariae and its antioxidant activity

Objective To study the optimum extraction and separation process of total flavonoids in the flowers of Flos Puerariae and its antioxidative activity.Methods The total flavonoids were extracted with assistance of ultrasonic wave and the content was determined at 265 nm wavelength by Spectrophotometric method.Orthogonal experiment L9(34)was carried out to investigate the effects of concentration of solvent,the ratio of material to liquid,time length of extraction,and frequency of extraction on extraction results of total flavonoids from Flos Puerariae.The extracted solution was purified by petroleum ether and ethanol sequently.Under these conditions,the total flavonoids was eluted gradiently with mixed mobile phase of methanol-chloroform solution in the silica gel column system,and then determined by UV scanning and HPLC.Fenton reaction was used to produce and detect hydroxyl radicals(·OH),and pyrogallol system was used to produce and detect the superoxide radical anion(O2-·).Results The optimum conditions were as follows;using 40%(V/V)methanol as extractor with the ratio of material to liquid at 1∶30,and extracting for 2.5 h a time for 3 times.The extraction yield of total flavonoids was 13.6%.Six isoflavone compounds were isolated from the flowers of Flos Puerariae by the method of silica gel column chromatography.Antioxidative test results showed good performance of flavonoid scavenging capacity in both hydroxyl radical system and superoxide radical system and its IC50 was 7.65 μg·mL-1 and 0.18 mg·mL-1,respectively.Conclusions This study provided scientific basis for further development and utilization of Flos Puerariae and make preparation for later pharmacological research.

Optimization of Extraction Process of Total Flavonoids and Chlorogenic Acid from Flos Lonicerae by Orthogonal Experiment

[Objectives]To explore the process of simultaneous extracting total flavonoids and chlorogenic acid from Flos Lonicerae by pressure assisted extraction.[Methods]Based on the single factor experiment,orthogonal experiments were carried out to investigate the effects of solvent concentration,solid-to-liquid ratio,extraction pressure,extraction time and extraction temperature on the extraction rate of total flavonoids and chlorogenic acid.[Results]The results showed that the extraction pressure had a significant effect on the extraction of two kinds of chemical constituents from F.Lonicerae.The optimum process conditions were as follows:solvent concentration was 60%,solid-liquid ratio was 1∶20(g/mL),extraction pressure was 2 MPa,extraction time was 30 min,extraction temperature was 70℃.The process conditions are stable,and the extraction efficiency is higher than that of ultrasonic assisted extraction method.Under the test conditions,the extraction rates of total flavonoids and chlorogenic acids were respectively 15.66%and 3.89%.[Conclusions]This study provides a new theoretical basis for the development and utilization of F.Lonicerae.

Extraction Technology of Total Flavonoids from Pueraria lobata (Willd.) Ohwi and Content Determination of Pueraria lobata (Willd.) Ohwi at Different Altitudes

[Objectives]To optimize the extraction technology of total flavonoids from Pueraria lobata( Willd.) Ohwi. [Methods]The ultraviolet-visible spectrophotometry was used to determine the content of total flavonoids in Pueraria lobata( Willd.) Ohwi. With the puerarin as index,the reflux extraction and single factor test were employed to investigate the effects of temperature,time,ethanol concentration and solid-liquid ratio on the content of total flavonoids in Pueraria lobata( Willd.) Ohwi,respectively. Under the optimal extraction technology,the content of total flavonoids in Pueraria lobata( Willd.) Ohwi at different altitudes was determined.[Results] The optimum extraction process was as follows: 70%ethanol; solid-liquid ratio of 1∶ 30; 1 h reflux extraction. Under these conditions,the extraction rate of flavonoids in Pueraria lobata( Willd.) Ohwi was 11. 48%,the total flavonoids content of different kudzu parts was in the order of roots > stems > leaves,and the total flavonoids content of the sample at about an altitude of 1000 m was significantly higher than at the altitudes of 1400 m and 1700 m.[Conclusions]It was suggested that the Pueraria lobata( Willd.) Ohwi should not be cultivated as medicinal plant in too high mountains,and the stems and leaves of Pueraria lobata( Willd.) Ohwi could be used as raw materials for extracting total flavonoids.

Effects of Ethanol Condensation Reflux Extraction and Ultrasound-assisted Extraction on the Content of Total Flavonoids of Pueraria edulis

With Pueraria edulis from different habitats in Yunnan Province,Guangdong Province and Guangxi Zhuang autonomous region as materials,the medicinal materials of P.edulis were extracted by ethanol condensation reflux extraction and ultrasound-assisted extraction,and the effects of different extraction methods the contents of total flavonoids in P.edulis from different areas were compared.The results showed that the best extraction time for P.edulis in Yunnan Province was 20 min,and that for Guangdong and Guangxi Zhuang Autonomous Region was 30 min.The yield of total flavonoids from P.edulis extracted by the condensation reflux extraction method was relatively better.The content of total flavonoids in P.edulis in Yunnan was the highest with an average content of 0.2557%,while the average content of total flavonoids in P.edulis in Guangdong was the lowest with an average content of 0.2108%.

野菊花不同溶剂提取物的体外抗氧化活性研究

目的 探讨野菊花不同溶剂提取物的体外抗氧化活性,并采用硝酸铝显色法测定其总黄酮含量。方法 检测石油醚、乙酸乙酯、正丁醇、残渣萃取、原浸膏提取物对1,1-二苯-2-苦基肼(DPPH)自由基和2,2′-联氨-(3-乙基苯并噻唑啉-6-磺酸)二氨盐(ABTS)自由基的清除能力,以评价其不同溶剂提取物的抗氧化活性;以芦丁为对照品,采用硝酸铝显色法测定各提取物的总黄酮含量。结果 野菊花上述5种溶剂提取物清除DPPH自由基的半数抑制浓度(IC_(50))分别为(312.2±10.29)μg/mL、(3.21±0.05)μg/mL、(40.60±1.73)μg/mL、(254.85±3.65)μg/mL、(114.57±3.75)μg/mL,清除ABTS自由基的IC_(50)分别为(112.05±2.00)μg/mL、(19.56±0.92)μg/mL、(24.03±0.77)μg/mL、(88.13±3.26)μg/mL、(53.78±1.19)μg/mL。野菊花上述5种溶剂提取物的总黄酮含量分别为(14.08±0.42)%,(42.43±1.63)%,(18.13±0.58)%,(5.17±0.085)%,(16.26±0.71)%。结论 野菊花不同溶剂提取物均有很强的抗氧化活性,其中乙酸乙酯提取物的抗氧化活性最强,且乙酸乙酯提取物的总黄酮含量也最高,野菊花中的黄酮类成分可能是其抗氧化的主要活性成分。该研究为从野菊花中提取天然抗氧化剂研究提供了参考。

微波辅助流动萃取槐花中的黄酮类成分

Microwave-assisted dynamic extraction of the total flavonoids, rutin and quercetin from Flos Sophaoae was studied. The dynamic extraction with household microwave oven was applied, and at the same time was compared with Soxhlet extraction and the method of bath extraction with special microwave oven. The results indicated that comparing with Soxhlet extraction this method not only needed a shorter time, but also simplified the procedure, and made higher yield of the extraction, and comparing with bath extraction with special microwave oven, this method have the advantage of cheap, safe and being helpful to investigating the extraction process.

葛根提取方法的比较研究及其工艺条件优化

采用水提法、回流法、渗漉法、索氏提取法、微波辅助萃取法、超声提取法等不同的方法提取葛根药材,以干浸膏得率、总黄酮得率及葛根素粗品得率为考察指标,对6种提取方法进行比较,并对其中一种最优方法进行工艺优化。结果表明,传统水提法提取葛根药材的效果最好。通过正交试验获得最佳提取工艺条件为8倍量溶剂,提取3次,每次1.5 h,其中溶剂倍量和提取次数为显著影响因素。水提法提取葛根药材,方法简便,有效成分的提取率高。

微生物酶解破壁提制葛根黄酮的工艺

采用生物酶促发酵降解葛根废渣的植物组织,有效提取葛根黄酮,通过高效液相色谱法测定黄酮的含量,优选出发酵菌种,对比葛渣不同处理方式,对接种量、培养基质和不同工艺参数等进行优化,并采用超声波萃取得到葛根黄酮粗品。结果表明:黑曲霉好氧发酵处理葛根废渣3.5g、添加辅料豆粕1.0g、葛根废渣质量与水的体积比1:20(g/mL)、黑曲霉接入量5%、pH5、在30℃发酵60h,测得葛根黄酮含量为3.769μg/mL;经超声波协同处理5min后,葛根黄酮质量浓度为5.204μg/mL,经分离、蒸馏后获得葛根黄酮粗品2.974mg/g。

葛花总黄酮的含量测定及体外抗氧化作用研究

确定葛花中总黄酮提取的优化工艺条件,并对提取物进行含量测定和体外抗氧化作用研究。通过正交试验,确定葛花中总黄酮的最佳工艺条件为:50%甲醇溶液,料液比为1∶30(g/mL),在70℃温度下,超声提取2.0 h,葛花中总黄酮的含量为17.48%。以ABTS.+、DPPH、NO等检测其清除自由基活性。结果表明,葛花总黄酮具有一定的清除DPPH、NO、O2-.能力和一定的抗氧化能力。

蒙药小秦艽花总黄酮超声波提取工艺及其抗氧化研究

采用超声波提取方法,优选小秦艽花总黄酮的最佳提取工艺,并对其抗氧化活性进行研究.通过正交试验考察了提取溶剂、料液比、提取时间3个因素对小秦艽花总黄酮提取率的影响,采用DPPH自由基清除法评价其抗氧化活性.实验结果表明,最佳提取条件为100倍量70%乙醇,提取时间30min,小秦艽花总黄酮显示出较强的清除DPPH自由基能力.

正交试验法优化忍冬叶中总黄酮的提取工艺

目的:确定提取忍冬叶总黄酮的最佳工艺条件。方法:采用正交试验法,分别考察乙醇冷浸、回流和超声提取对提取率的影响,并与乙醇索氏提取以及水提取最佳工艺比较。用分光光度法测定总黄酮含量。结果:在不同的乙醇提取工艺中,总黄酮含量高低顺序为回流法≈索氏提取法>超声法≈冷浸法。在不同的水提取工艺中,总黄酮含量高低顺序为回流法>超声法≈碱水冷浸法>冷浸法。结论:提取忍冬叶总黄酮的最佳条件为:12倍量60%乙醇,水浴回流提取2次,每次1.5h。

野葛花黄酮和花青素的提取及抗氧化性研究

为更好开发利用野葛,研究野葛花黄酮和花青素的超声辅助乙醇浸提工艺,以及黄酮和花青素提取物的抗氧化性。结果表明:野葛花黄酮的最佳工艺条件为料液比为1∶30(g/mL)、提取温度为40℃、提取时间为110 min,葛花黄酮得率为2.84%;野葛花花青素的最佳提取工艺条件为乙醇浓度60%,料液比1∶30(g/mL),提取时间120 min,提取温度60℃,花青素得率为2.17%;野葛花黄酮和花青素对羟自由基的清除效果明显优于抗坏血酸。试验结果可为综合开发利用葛根资源,延长葛根加工的产业链提供一定参考依据。

葛粉总黄酮的提取及其清除DPPH·自由基的研究

研究微波辅助处理方法从葛粉中提取总黄酮,从微波处理时间、微波强度、浸取时间、乙醇体积分数和固液比等因素对葛粉总黄酮提取量的影响进行实验。研究结果表明:用微波中火对葛粉进行辅助处理20s后,选用体积分数为75%的乙醇,固液比为1∶20,浸取8h,得到的葛粉总黄酮提取量为最佳。同时研究其对DPPH.的清除作用,表明葛粉总黄酮具有较强的抗氧化作用,是一种天然抗氧化剂。

葛根总黄酮提取工艺的研究

目的:筛选提取葛根总黄酮的最佳工艺条件。方法:采用单因素和正交试验对提取葛根总黄酮的工艺条件进行优化;利用紫外可见分光光度计测量葛根总黄酮的含量;利用高效液相色谱仪测量葛根素的含量;分别以葛根素和葛根总黄酮的含量为指标进行最优工艺的评价。结果:最佳工艺条件是以9倍量的30%乙醇提取3次,每次1h。结论:该提取工艺简单,成本低,适合于生产应用。

葛花总黄酮的抗氧化作用研究

为研究葛花总黄酮的体外抗氧化作用,以70%乙醇为溶剂,微波方法提取葛花中的总黄酮,用比色法测定其含量为4.72%;通过还原能力的测定、Fenton反应体系、DPPH法以及邻苯酚自氧化体系等评价葛花总黄酮体外抗氧化能力.结果显示,葛花总黄酮在还原力测定以及对三种自由基的清除上,表现出了不同程度的抗氧化能力.对O2-.和DPPH.及.OH 3种自由基具有明显的的清除作用,其EC50分别为:0.095mg/ml、0.114mg/ml、0.700mg/ml.葛花总黄酮具有较强的还原力,在清除自由基方面其清除率与其浓度存在着明显的量效关系.

葛花总黄酮对糖尿病小鼠视网膜MDA、SOD的影响

目的探讨葛花总黄酮(TFF)对糖尿病小鼠视网膜抗氧化损伤的作用。方法 40只C57BL/6J小鼠随机分为5组:正常对照组、糖尿病(DM)模型组、TFF小剂量组(TFFⅠ)、中剂量组(TFFⅡ)和大剂量组(TFFⅢ)。DM、TFFⅠ、TFFⅡ和TFFⅢ组造模成功后第5周开始给药,给药10周,于第15周测定小鼠血糖和体重,处死小鼠取眼球,测定各组小鼠视网膜过氧化终产物丙二醛(MDA)含量和超氧化物歧化酶(SOD)活性。结果与模型组(血糖20.98±5.57 mmol/L,体重21.55±1.67g)比较,给予TFF中剂量组血糖(13.51±6.09 mmol/L)和大剂量组血糖(9.66±2.86 mmol/L)显著下降(P<0.01),大剂量组(体重24.50±1.58g)可明显改善体重的下降(P<0.01)。与模型组(MDA含量:12.10±1.06nmol/mgprot,SOD活性:8.45±0.95 U/mgprot)相比,TFF小、中、大剂量组MDA含量均明显降低(MDA含量分别为:7.98±0.40、5.75±0.63、5.24±0.48 nmol/mgprot,P<0.01),SOD活性均明显升高(SOD活性分别为:13.10±0.90、17.28±0.94、17.79±1.21U/mgprot,P<0.01)。结论 TFF能增强糖尿病小鼠视网膜抗氧化能力,减轻视网膜的氧化损伤,从而对糖尿病视网膜病变起一定保护作用。

葛根总黄酮的提取精制及含量测定方法研究

目的选择葛根总黄酮的最佳提取工艺及溶剂法纯化总黄酮的方法。方法用不同浓度乙醇回流法提取葛根;采用萃取法、回流法精制纯化总黄酮,采用高效液相色谱法优选葛根药材质量,采用紫外分光光度法测定提取和纯化后的总黄酮含量。结果与结论 95%乙醇回流法总黄酮得率最高,乙酸乙酯萃取法纯化总黄酮达到要求。

超声波辅助提取葛根中总黄酮及其体外抗氧化性的研究

利用超声波辅助乙醇浸提法探索提取葛根中总黄酮的最佳条件,并进一步考察葛根总黄酮提取物的体外抗氧化性。结果表明,葛根中总黄酮最佳提取工艺为:温度60℃,提取固液比为1∶15(g/m L),70%体积分数的乙醇溶液,提取25 min。在此条件下,葛根中总黄酮的提取率可达2.91 mg/g。葛根黄酮提取物对DPPH·、羟基自由基有明显的清除作用。

湿式超微粉碎提取怀菊花总黄酮的研究

采用湿式超微粉碎工艺提取怀菊花中总黄酮。在单因素试验的基础上,采用L9(34)正交试验对提取工艺进行优化,考察胶体磨磨隙、乙醇体积分数、提取温度、提取时间对总黄酮得率的影响。结果表明,适宜的提取条件为胶体磨磨隙20μm、乙醇体积分数75%、提取温度70℃、提取时间20min,总黄酮得率可达3.45%。湿式超微粉碎提取方法得率高,提取时间短,是一种提取怀菊花中总黄酮的适宜方法。

响应曲面法优化葛根总黄酮的提取工艺研究

目的 :研究响应曲面法乙醇提取葛根总黄酮的工艺。方法 :在单因素试验的基础上,采用响应曲面法研究乙醇浓度、固液比和提取时间对葛根总黄酮提取率的影响。结果 :醇法提取葛根总黄酮的最佳工艺为乙醇浓度68.30%、固液比1:25和提取时间71.98 min时,此时葛根总黄酮的提取率达12.05%。结论 :响应曲面法建立的模型预测性良好,适用于葛根总黄酮提取工艺的优化。