朝鲜淫羊藿中性多糖与酸性多糖的理化特征及抗氧化活性的比较

对朝鲜淫羊藿多糖(EFPC)进行分离纯化,并对其理化性质及抗氧化活性进行研究.采用水提醇沉法获得朝鲜淫羊藿粗多糖,通过除蛋白,经DEAE-52纤维素色谱柱(0.5 mol/L NaCl溶液洗脱),得到中性多糖(EFPN)和酸性多糖(EFPA).EFPC、EFPN和EFPA糖含量分别为79.59％、87.14％和91.4...     

人参多糖的分离纯化及其单糖组成分析

以人参为原料,研究人参多糖分离纯化方法得到均一多糖,并对其相对分子质量、单糖组成、红外光谱(Infrared,IR)进行分析。利用三氯乙酸法(Trichloroacetic Acid,TCA)除蛋白,再经DEAE-Cellulose-52柱和HW-55F凝胶柱分离纯化获得均一组分PGS1-1。采用凝胶柱层析法测定其相对分子质量,高效液相色谱与蒸发光散射检测器联用及IR研究PGS1-1的单糖组成及基本结构。研究表明三氯乙酸除蛋白最佳工艺条件为料液比1∶2,三氯乙酸(TCA)浓度12%,作用时间60 min,此条件下测得蛋白脱除率与多糖保留率综合得分87.80。分离纯化得到PGS1-1组分,其相对分子质量为2.8×104Da,主要由葡萄糖、半乳糖、鼠李糖、阿拉伯糖组成,物质的量比为0.34∶0.27∶1.44∶0.42,IR证明PGS1-1具有吡喃型β-糖苷键的多糖特征峰,为人参多糖的分离纯化及单糖组成提供了理论依据。     

黄芪多糖的分离纯化及药理作用研究进展

目的:介绍黄芪多糖的分离纯化及药理作用研究进展。方法:检索近几年关于黄芪多糖分离纯化及药理作用的研究报道,进行归纳总结。结果:黄芪多糖具有抗氧化、抗肿瘤、降糖、抗菌、心血管保护等药理活性;黄芪多糖分离纯化方法主要有大孔吸附树脂分离技术、凝胶柱层析法、DEAE纤维素柱层析法、分级醇沉法等。结论:黄芪多糖药理及分离技术研究广泛,为其深入研究奠定基础,具有良好的发展前景。     

管花肉苁蓉药渣中多糖提取工艺及体外抗氧化活性研究

在单因素实验的基础上,通过正交实验优化了管花肉苁蓉药渣中多糖的提取工艺,并对其体外抗氧化活性进行了初步研究。结果表明,最佳提取工艺条件为:提取温度90℃、料液比1∶50(g∶mL)、提取时间2.0 h,在此条件下,管花肉苁蓉多糖提取率为5.76%;管花肉苁蓉多糖具有较高的抗氧化活性,其对DPPH自由基、羟基自由基具有清除能力,对铜离子有较强的还原能力。该提取方法简便易行,节能环保,适用于管花肉苁蓉多糖的提取。     

烷基糖苷在三种液相色谱柱中的色谱对比

对C1214烷基糖苷在ODS-BP柱、氨基柱、凝胶过滤色谱柱三种液相色谱柱中的色谱行为进行比较研究,结果表明烷基糖苷在三种色谱柱中的保留性质各有侧重,特点明显:ODS-BP柱对C12和C14烷基单苷的分离能力较强,对烷基多苷分离能力较弱;氨基柱对不同聚合度的烷基糖苷分离能力较强,对同聚合度不同烷基链的烷基糖苷分离能力较弱;凝胶柱对不同聚合度和不同烷基链的烷基糖苷皆有分离能力,但分析时间长。三种色谱柱的分析结果略有差异。     

薤白多糖的提取及体外抗氧化活性研究

用热水浸提法提取薤白中的生物多糖,采用响应面法对提取条件进行优化,并研究了薤白多糖的体外抗氧化活性。结果表明,最佳提取条件为:提取温度72℃,提取时间1.5 h,液料比20∶1 m L/g,薤白多糖提取率(5.26±0.014)%。薤白多糖具有一定的体外抗氧化能力,但活性低于同浓度的Vc,其中薤白多糖对羟基自由基的清除能力相对较强,IC50值为1 591.7μg/m L;对超氧阴离子自由基的清除能力及对Fe3+的还原能力较弱。     

响应面法优化鹿茸胶原蛋白制备抗氧化肽的水解条件

以鹿茸中下段胶原蛋白为酶解底物,用木瓜蛋白酶酶解制备小分子抗氧化肽,以清除1,1-二苯基-2-苦基肼基(DPPH?)自由基的能力为指标,采用响应面法优化酶水解条件。结果表明,最优实验条件为时间56 min,酶添加量1.40wt%,pH=5.60,温度60℃。该条件下所得抗氧化肽对DPPH?自由基的清除率为83.09%。用超滤膜、半制备色谱柱和超高效液相色谱?质谱联用仪分级分离获得分子量0.2?0.6 kDa的具有最高抗氧化活性的多肽,其具有与头段类似的保健功效,更易被人体吸收,且易进一步加工和储存。     

紫花苜蓿根部多糖的结构表征及其体外活性研究

选取紫花苜蓿根为研究对象，利用热水回流法提取紫花苜蓿根多糖，采用Sevage法和酶法联合去蛋白，脱色后采用DEAE纤维柱和凝胶柱层析分离得到纯化苜蓿根多糖（DAPS-1）。采用高效液相凝胶色谱测定DAPS-1的相对分子质量为26.95 kDa，通过红外光谱对多糖的结构表征，结果显示DAPS-1是一类α-吡喃型糖。体外清除自由基实验表明DAPS-1是具有抗氧化活性多糖。以HepG2细胞为模型，考察了DAPS-1对油酸诱导的非酒精性脂肪肝细胞模型的干预作用，结果表明DAPS-1可显著降低油酸诱导的HepG2细胞内脂质的累计，具备一定的降脂效果。     

金银花多糖抗氧化活性研究

目的:探讨金银花多糖的体外抗氧化活性。方法:采用水提后Sevage法纯化得金银花多糖,用苯酚—硫酸法测定多糖含量,并采用还原/抗氧化能力、清除DPPH自由基、ABTS+自由基能力检测金银花多糖的抗氧化能力。结果:金银花多糖的含量为75.8%,金银花多糖具有较强的抗氧化活性,在还原/抗氧化能力检测中,其FeSO4当量为1.23 mmol/L,对DPPH自由基、ABTS+自由基的半清除率浓度IC50分别为0.7mg/mL和0.8 mg/mL。结论:结果表明金银花多糖具有较强的抗氧化活性,可作为抗氧化剂应用。     

薤白多糖的提取及体外抗氧化活性研究

用热水浸提法提取薤白中的生物多糖,采用响应面法对提取条件进行优化,并研究了薤白多糖的体外抗氧化活性。结果表明,最佳提取条件为:提取温度72℃,提取时间1.5 h,液料比20∶1 m L/g,薤白多糖提取率(5.26±0.014)%。薤白多糖具有一定的体外抗氧化能力,但活性低于同浓度的Vc,其中薤白多糖对羟基自由基的清除能力相对较强,IC50值为1 591.7μg/m L;对超氧阴离子自由基的清除能力及对Fe3+的还原能力较弱。     

茯苓多糖的纯化及分子量测定

通过水提醇沉的方法得到茯苓粗多糖,精制后采用离子交换柱层析对多糖进行分离纯化,用高效凝胶过滤色谱法(HPGFC)测定多糖分子量.结果表明,茯苓粗多糖用Sevag法脱蛋白效果较好,获得了精制茯苓多糖(TAP);经DEAE-650C层析柱纯化,得到中性多糖(TAP1)和酸性多糖(TAP2),高效凝胶过滤色谱法测定其分子量分...     

夏枯草降糖成分提取工艺的优化

文章介绍夏枯草中降糖成分提取条件的优化研究,以熊果酸为指标物。采用乙醇加热回流法,检测方法采用紫外分光光度法,检测波长为206nm。用石油醚洗涤去除大部分杂质。选择乙醇浓度,料液比,提取温度,提取时间为考察因素。确定夏枯草中熊果酸最佳工艺条件为80%乙醇为溶剂,料液比1︰20,在80℃恒温下,水浴回流110min。该方法简单易行。     

伤寒Vi多糖柱层析纯化工艺的优化

目的优化伤寒Vi多糖柱层析纯化工艺,以替代传统苯酚抽提、乙醇分级沉淀法。方法采用DEAE离子交换层析柱,分别在缓冲液(20 mmol/L Tris-Cl)pH值为6.0、7.0和8.0的条件下纯化1批伤寒Vi多糖粗糖,并与传统苯酚抽提、乙醇分级沉淀法进行比较。按《中国药典》三部(2010版)要求检测纯化样品的蛋白质含量、核酸含量、O-乙酰基含量、分子大小及内毒素含量,并计算样品的多糖回收率。采用优化的DEAE柱层析纯化工艺纯化3批伤寒Vi多糖粗糖,验证该工艺的稳定性。结果 DEAE离子交换柱缓冲液(20 mmol/L Tris-Cl)pH值为7.0和8.0时,可有效将伤寒Vi多糖的杂质与纯化产物分离,多糖回收率分别为36.52%和38.35%,明显高于传统工艺的多糖回收率(15.52%),且纯化产物的内毒素含量(10 EU/μg)明显低于传统工艺(200 EU/μg)。以优化工艺(pH 7.0)纯化3批伤寒Vi多糖粗糖获得的6批精糖的蛋白质含量、核酸含量、O-乙酰基含量、分子大小、内毒素含量及多糖回收率差异较小,标准偏差均小于5%。结论优化了伤寒Vi多糖柱层析的纯化工艺,该工艺稳定性良好,可替代传统苯酚抽提、乙醇分级沉淀法,应用于伤寒Vi多糖的纯化。     

High efficiency preparation of standard grade γ-tocopherol and its antioxidant activity

Natural standard grade γ-tocopherol is of great interest due to its good antioxidant activity and special pharmacological functions. This study separated and purified γ-tocopherol from mixed tocopherols using eco-friendly and low toxicity solvents. γ-Tocopherol (0.28 g) was obtained per performance with a purity of (98.89 ± 0.68)% and a recovery rate of (93.23 ± 0.89)%. The purification conditions were as follows: elution solvent n-hexane/ethyl acetate 94.5:5.5 (v/v), sample load 0.5 g, a column height to diameter ratio of 16:1 (length and diameter, 60 × 3 cm) and an elution rate of 2 ml/min. The purity and structure of γ-tocopherol was confirmed by high-performance liquid chromatography, gas chromatography/mass spectrometry and nuclear magnetic resonance. The adsorption isotherm of γ-tocopherol on silica gel (200–300 mesh) fitted the Langmuir isotherm model well. The antioxidant activity analysis showed that γ-tocopherol had the strongest antioxidant activity followed by δ-tocopherol and α-tocopherol. This study provides an economically attractive solution for the production of natural standard grade γ-tocopherol.     

Characterization and Antihyperglycemic Activity of a Polysaccharide from Dioscorea opposita Thunb Roots

A polysaccharide DOTP-80 from Dioscorea opposita Thunb was obtained by using the method of acid water-extraction and ethanol-precipitation. After being purified by chromatography, the structure characteristics of DOTP-80 were established. Based on the calibration curve obtained with standard dextrans, the molecular weight of the polysaccharide fraction DOTP-80 was calculated to be 123 kDa. The results of Infrared spectrum (FT-IR) indicated that the polysaccharide contained the α-configuration of sugar units. GC-MS analysis revealed that DOTP-80 was mainly composed of mannose and glucose. Alloxan-induced diabetic rats and mice models were developed to evaluate the in vivo hypoglycemic activity of the polysaccharide. The results indicated that a high dose DOTP-80 (400 mg/kg) had strong hypoglycemic activity. Moreover, DOTP-80 could increase the level of antioxidant enzymes (SOD) activity in alloxan-induced diabetic mice and stimulate an increase in glucose disposal in diabetic rats. Therefore, the polysaccharide DOTP-80 should be evaluated as a candidate for future studies on diabetes mellitus.     

Purification of wedelolactone from Eclipta alba and evaluation of antioxidant activity

A hybrid chromatography-crystallization process to purify wedelolactone obtained from Eclipta alba was developed. The crude extract was obtained by microwave-assistant extraction and purified by silica gel column chromatography in which dichloromethane–methanol–acetic acid solution was used as the eluent. Dilution crystallization was employed to perform the final purification. To optimize the processing parameters, single factor analysis and response surface methodology were employed. The results indicated that the purification yield and purity of wedelolactone could reach 77.66% and 99.46%, respectively. Antioxidant assays showed that the products had strong antioxidant and free radical scavenging activity which was close to oligomeric proantho cyanidins.     

油茶叶多糖的闪式提取工艺优化及其抗氧化活性

在单因素试验基础上用响应面法对油茶叶多糖的闪式提取工艺进行优化,并对较优条件下提取的多糖的抗氧化活性进行测试.研究结果表明:油茶叶多糖闪式提取的较佳工艺条件为料液比1:30 (g:mL),提取温度81℃,提取时间75 s,此条件下,油茶叶多糖得率为8.43％.油茶叶多糖对DPPH·、·ABTS+、OH·都有很强的清除能...     

Candida sp.脂肪酶的纯化及其性质

采用简单的两步法-离子交换层析和疏水层析法,对Candida sp. 99-125脂肪酶进行了纯化,比活提高了10.0倍,达到27200 U/mg,回收率为35.5%. SDS-PAGE电泳分析显示该酶的分子量约为38 kDa. 酶学性质研究表明,该酶最适反应温度为40℃,最适反应pH值为8.5,在室温下具有良好的稳定性. 钙离子和Tween80能够促进提高脂肪酶的活性,而铁离子、铜离子和SDS对其有明显的抑制作用.     

淡豆豉中多糖的分离纯化及结构特征研究

以中药淡豆豉为原料,采用超声法提取淡豆鼓多糖,硫酸-苯酚法检测总多糖含量。通过透析、醇沉、酶解蛋白、H2O2脱色,并经Sephadex G-100凝胶柱层析进一步纯化,得到多糖组分SPSS和SPSSII。利用凝胶渗透色谱(GPC)对其进行相对分子质量分析,红外光谱检测主要结构特征。结果表明,淡豆豉中总多糖含量为0.91%,SPSSI和SPSSII为均一性多糖,相对分子质量分别约为9500和7000,其结构具有多糖类物质的典型特征。     

Separation and purification of Porphyra haitanensis polysaccharide and its preliminary structural characterization

Porphyra haitanensis polysaccharide was separated and purified by microwave-assisted extraction with sequential DE-52 anion-exchange chromatography and Sephadex G-100 size-exclusion chromatography. The maximal yield of polysaccharide was 3.6% by microwave-assisted extraction. After purification, three polysaccharide components (PY1, PY2, and PY3) were obtained. PY1 had α-glycosidic bonds, whereas PY2 and PY3 had the β-amide pyranose. Sulfate groups and 3,6-anhydrogalactose were presented in three purified polysaccharide components. PY1 contained galactose and a little of xylose and arabinose. PY2 contained galactose and a little of arabinose, xylose, glucose, and mannose. The contents of sulfate groups, 3,6-anhydrogalactose, and galactose were also determined.