不同纯化方法对花生多糖抗氧化活性的影响

以冷榨花生饼为原料,经提取得到花生多糖粗液,分别采用双酶水解和DEAE-52纤维素柱层析的方法进行纯化得到花生多糖PPS-a、PPS-2组分,并研究二者的抗氧化能力。研究表明:两个组分具有一定的清除羟基自由基、超氧阴离子、DPPH、还原力和抗脂质过氧化能力,且其清除效果随着浓度增加而增加,其中PPS-a的抗氧化活性较PPS-2强。与VC相比,PPS-a和PPS-2的浓度大于5 mg/mL时,两种多糖对羟基自由基清除能力均高于VC;从清除超氧阴离子和DPPH自由基及抗脂质过氧化方面来看,其抗氧化能力均低于VC;两种多糖的还原力最差,仅达到VC的16%左右。     

灰毡毛忍冬提取纯化物抗氧化性研究

目的:研究灰毡毛忍冬提取纯化物的抗氧化性.方法:采用超氧阴离子自由基体系、羟基自由基体系和Oyaizu法,对灰毡毛忍冬提取纯化物的抗氧化活性进行研究,并与抗坏血酸(VC)进行比较.结果:灰毡毛忍冬提取纯化物对几种自由基均有不同程度的清除作用,其对超氧阴离子清除作用不明显,比抗坏血酸要弱,最大清除率只有47.71%,并没有超过50%,而灰毡毛忍冬提取纯化物对羟自由基的清除能力以及对Fe3 的还原能力均要明显强于抗坏血酸,分别达到了82.41%(清除率)和0811(吸光度).结论:灰毡毛忍冬提取纯化物对羟自由基具有较强的清除能力,对Fe3 具有较好的还原作用.清除作用和还原能力与绿原酸的浓度呈正相关性.除对O2-·的清除能力比VC稍弱外,在清除·OH能力和还原力方面均较VC的能力强.     

蓝孔地花菌多糖的体外抗氧化活性

采用水提醇沉法提取蓝孔地花菌子实体多糖,并通过DE-52和Sephadex G-100柱色谱进行纯化,得纯化多糖(ACP1)。以还原能力、清除DPPH自由基、羟自由基、超氧阴离子能力和螯合铁离子能力为指标,评价了ACP1的抗氧化活性。结果表明ACP1具有较强的体外抗氧化活性,其活性大小与浓度呈正效应,ACP1的总还原力、清除DPPH自由基、羟自由基、超氧阴离子能力和螯合铁离子能力的IC50分别为0.09、0.27、0.64、0.42、0.62mg/m L。说明蓝孔地花菌多糖可以作为天然的抗氧化剂应用于食品和药品行业。     

广东淮山水溶性多糖的分离纯化及体外抗氧化活性的研究

广东淮山经热水提取、乙醇沉淀得粗多糖，再经脱脂、脱蛋白、脱色、两次Sephadex G-75柱层析纯化得多糖精品，经纸层析、旋光度测定、紫外光谱鉴定为均一多糖。在体外设计产生超氧阴离子自由基、羟基自由基和脂质自由基等3个体系，分别加入广东淮山不同浓度的多糖粗品和精品，结果表明，广东淮山多糖粗品及精品对超氧阴离子自由基和羟自由基均有较高清除作用，但对脂质自由基的清除能力较弱，而且经纯化精制后的广东淮山多糖对超氧阴离子自由基和羟自由基的清除作用均小于其粗品。     

海英菜多糖提取工艺的响应面法优化及其体外抗氧化作用

以单因素试验为基础,选择提取温度、提取时间、液料比三因素三水平进行Box-Behnken组合试验,对野生海英菜粗多糖提取工艺参数进行优化分析。结果表明海英菜粗多糖水浸提的最佳工艺条件为提取温度87℃、提取时间3.5h、液料比31.5:1(mL/g),在此条件下海英菜粗多糖得率达到2.028%。以VC和叔丁基对苯二酚为对照,测定脱蛋白海英菜多糖的体外抗氧化作用,结果表明海英菜多糖的还原能力、对超氧阴离子自由基和羟自由基的清除能力均表现出较好的效果,清除超氧阴离子自由基和羟自由基的IC50分别为0.841mg/mL和0.712mg/mL,其抗氧化能力低于VC,与叔丁基对苯二酚相近。     

醇提山茱萸皂甙的体外抗氧化活性研究

以山茱萸为原料,从中提取、纯化总皂甙.采用超氧阴离子自由基、过氧化氢自由基、羟基自由基、烷基自由基引发的亚油酸氧化体系及DPPH(二苯代苦味酰肼自由基)自由基对醇提山茱萸皂甙的体外抗氧化活性进行研究, 并同VC进行比较.结果表明,醇提山茱萸皂甙对这几种自由基均有不同程度的清除作用,其中对超氧阴离子自由基、烷基自由基的清除能力较好,且在一定浓度范围内清除能力远远高于VC;对DPPH自由基的清除能力略高于VC.对羟基自由基的清除能力与VC相当,对过氧化氢自由基清除能力低于VC.因此山茱萸皂甙是一种较好的天然抗氧化剂.     

宁夏野生锁阳多糖的提取工艺及体外抗氧化活性研究

通过传统的热水浸提取方法对宁夏野生锁阳多糖进行提取,在单因素基础之上采用响应曲面法优化提取工艺,得到最佳提取工艺参数为:料液比1∶25g/m L,提取时间2.5h,提取温度90℃,在此条件下锁阳多糖的得率为:22.32%。此外,体外抗氧化性实验采用总还原能力、DPPH自由基的清除能力、超氧阴离子自由基的清除能力、羟自由基的清除能力作为锁阳多糖的体外抗氧化作用评价的指标,并与VC进行了比较。表明锁阳多糖具有一定的总还原能力及清除自由基的作用,锁阳是一种具有抗氧化活性的天然中药材。     

植物乳杆菌胞外多糖的分离纯化及其抗氧化性研究

对一株分离自鲊辣椒的植物乳杆菌的胞外多糖进行提取,采用DEAE Cellulose DE-52和Sephadex G-200进行纯化,得到一种中性多糖(EPS-1)和一种酸性多糖(EPS-2)。凝胶过滤法测得EPS-1相对分子质量为1.26×105,EPS-2相对分子质量为6.76×104。对EPS-1、EPS-2及胞外粗多糖进行体外抗氧化性检测,结果表明,三种多糖均具有较强自由基清除能力;无论对于羟自由基、超氧阴离子自由基及DPPH自由基的清除,还是还原能力,酸性多糖EPS-2均表现出最高活性。因此选择EPS-2,模拟胃肠道环境,研究人工胃液及肠液对其抗氧化性的影响,结果表明,EPS-2对DPPH自由基的清除能力在人工胃液及肠液中均保持稳定;对羟自由基及超氧阴离子自由基的清除能力随着人工胃液及肠液作用时间延长,均有一定增强。     

百合籽多糖的制备及其抗氧化活性研究

采用热水浸提法提取百合籽多糖,并用苯酚–硫酸法测定其含量,采用红外光谱鉴定多糖的结构。测定清除超氧阴离子自由基、羟自由基和还原能力来研究百合籽多糖的抗氧化活性。研究表明,百合籽的多糖含量为64.42%,其具有清除超氧阴离子自由基和羟自由基的活性,并具有一定的还原能力。     

野生仙人掌多糖抗氧化性研究

从野生绿仙人掌中采用超滤浓缩醇沉法提取并纯化多糖,用55%和80%浓度的乙醇分段醇析分离得两种粗多糖OMHP1和OMHP2。用分光光度法研究了仙人掌多糖在不同体系中对超氧阴离子、羟自由基、DPPH自由基的清除作用。结果表明,仙人掌多糖能够有效地清除超氧阴离子、羟自由基、DPPH自由基,粗多糖OMHP2的作用效果明显强于OMHP1。     

Molecular Structural Characteristics of Polysaccharide Fractions from Canarium album (Lour.) Raeusch and Their Antioxidant Activities

The objective of this study was to investigate the multiple relations between the preliminary molecular structural characteristics and antioxidant activities of polysaccharides from Canarium album (Lour.) Raeusch (CPS). Three polysaccharide fractions, CPS1, CPS2, and CPS3, were isolated from CPS by column chromatography. CPS1 and CPS3 were mainly composed of neutral polysaccharides linked by α‐ and β‐glycosidic linkages while CPS2 was pectin polysaccharides mainly linked by β‐glycosidic linkages. According to the SEC‐MALLS‐RI system, the molecular weight of CPS1 was greater compared to CPS2 and CPS3, and the molecular weight and radius of CPS did not display positive correlation. The chain conformation analysis indicated CPS1 and CPS2 were typical highly branched polysaccharides while CPS3 existed as a globular shape in aqueous. Furthermore, the antioxidant activity of CPS2 was better than that of CPS3, while that of CPS1 was the weakest. The antioxidant activities of polysaccharide fractions were affected by their monosaccharide composition, glycosidic linkage, molecular weight, and chain conformation. This functional property was a result of a combination of multiple molecular structural factors. CPS2 was the major antioxidant component of CPS and it could be exploited as a valued antioxidant product.     

蜜环菌水溶性多糖的抗氧化活性研究

目的:通过蜜环菌水溶性多糖对·OH、O2-·和DPPH·三种自由基清除作用,评价其抗氧化性能,为蜜环菌药物制剂的活性研究及其产品的质量检测标准提供重要参考。方法:经热水浸提、除蛋白等步骤分离纯化到水溶性多糖,以抗坏血酸和TBHQ为对照,采用分光光度法评定其抗氧化特性。结果:蜜环菌水溶性多糖对三种自由基均有不同程度的清除活性,对三种自由基的清除能力是DPPH·>·OH>O2-·,当清除率达到90%以上时,清除DPPH·、·OH和O2-·的所需的多糖浓度分别为1.0、5.0、6.0mg·mL-1,蜜环菌多糖的清除能力显著。结论:蜜环菌水溶性多糖在体外具有较明显的抗氧化活性,在实验浓度范围内,抗氧化效果与浓度呈显著的线性相关。作为一种重要的天然活性物质,蜜环菌多糖的抗氧化活性和抗衰老作用将具有较高的应用价值。     

Immunizing effects of cocultures of H22 hepatocarcinoma cells and cartilage polysaccharide on murine H22 hepatocarcinoma

Hepatocarcinoma is a malignant cancer, which is threatening human lives. In order to disclose the immunizing effects of the cells and cartilage polysaccharide (CHCP) on liver cancer, murine H22 hepatocarcinoma model was set up. The survival time, life span, and survival rate of the CHCP group were better than model group or other groups which was immunized with cartilage short-chain polysaccharide (CPS) only or H22 cell lysate only. A series of experiments were proceeded and the results confirmed that the humoral immunity and cellular immunity were strengthened. HE staining, TUNEL assay, and Alcian staining were used to research the mechanism of the tumor specific antigen production which may be related to the apoptosis of H22 hepatocarcinoma cells induced by CPS or some new polysaccharide compound emerged. The animal experiment testified the relationship between H22 hepatocarcinoma cell apoptosis induced by CPS and the effect of murine H22 hepatocarcinoma immunoprophylaxis. Our data demonstrated that the coculture of cartilage polysaccharide and cancer cells may serve as a novel source of antihepatocarcinoma agent that may play an important role in future liver cancer immunoprophylaxis.     

Chemical characteristics and antioxidant activities of polysaccharide purified from the seeds of Plantago asiatica L.

BACKGROUND: A water‐soluble polysaccharide from the seeds of Plantago asiatica L. (P. asiatica L. polysaccharide, PLP) was extracted with hot water and purified by gel filtration chromatography. The chemical characteristics of PLP were determined by high‐performance gel permeation chromatography (HPGPC) and Fourier transform infrared (FTIR) spectroscopy. In addition, the antioxidant activities of PLP in vitro were evaluated using various test systems, including scavenging of 1,1‐diphenyl‐2‐picryl‐hydrazyl (DPPH) radicals, scavenging of superoxide radicals generated by 1,2,3‐phentriol autoxidation, scavenging of hydroxyl radicals and inhibition of lipid peroxidation. RESULTS: The molecular weight of PLP was determined by HPGPC to be about 1894 kDa. PLP contained 29.2 g kg^?1 protein and 145.8 g kg^?1 uronic acid. The FTIR spectrum of PLP also revealed typical characteristics of a polysaccharide containing protein and uronic acid. Moreover, the results showed that PLP possessed antioxidant activities, but lower than those of ascorbic acid. CONCLUSION: PLP is an acid protein‐bound polysaccharide of high molecular weight, but its structure needs further study. The present results suggest that PLP could potentially be used as a natural antioxidant. Copyright © 2009 Society of Chemical Industry     

青天葵多糖的分离纯化、结构表征及其抗氧化活性分析

对水提醇沉获得的青天葵粗多糖进行分离纯化,并对多糖组分进行分析表征和体外抗氧化活性评价。结果表明,用DEAE-52纤维素及葡聚糖凝胶G-100柱色谱分离纯化出的多糖组分NFP-2分子质量为1150 kDa,总糖含量为82.64%,糖醛酸含量为16.65%,蛋白质含量为6.38%。NFP-2由半乳糖、阿拉伯糖、甘露糖、葡萄糖、鼠李糖、半乳糖醛酸组成,摩尔比为21.27:13.21:5.26:3.02:2.82:1,其为不含三螺旋结构的酸性多糖,糖苷键构型为β-构型。体外清除自由基试验结果显示,NFP-2对羟基自由基（IC₅₀ 7.95 mg/mL）和超氧阴离子自由基（当浓度为0.5 μg/mL时,清除率为60%）均有明显清除作用;当NFP-2浓度为10 mg/mL时,ABTS阳离子自由基的清除率为35.44%;当NFP-2浓度为120 μg/mL时,DPPH自由基清除率为17%。     

蒲公英多糖乙酰化修饰、体外抗氧化及抑菌作用研究

目的:以蒲公英多糖为原料,使用乙酸酐法修饰得到乙酰化蒲公英多糖,对其结构特征、体外抗氧化性以及抑菌效果进行研究.方法:采用水提醇沉法等制备蒲公英纯化多糖,选择乙酸酐法修饰得到乙酰化蒲公英多糖.利用红外光谱、扫描电镜、X-射线粉末衍射等测定蒲公英纯化多糖和乙酰化蒲公英多糖的结构特征.在此基础上,应用体外化学模型法评估多糖...     

化橘红多糖的提取纯化及抗氧化活性研究

对化橘红粗多糖及其纯化组分的抗氧化活性进行研究。化橘红粉末经热水提取、乙醇沉淀、sevage法脱蛋白、透析得到粗多糖,粗多糖经DEAE-52纤维素阴离子交换层析柱分离,得到2个纯化组份ECP1和ECP2。采用化学法分别测定了粗多糖及其纯化组分的体外清除自由基(DPPH.,.OH,ABTS.+)能力、还原能力。粗多糖的多糖含量为74.29%,经DEAE-52纯化的组分ECP1和ECP2的多糖含量分别为83.39%和85.77%。结果表明粗多糖及其两个纯化组分均具有较好的抗氧化清除自由基的能力,并且抗氧化能力与多糖浓度之间存在良好的相关性。其中ECP2的抗氧化清除自由基能力强于ECP和ECP1,但是低于对照VC。     

Rhizobium trifolii capsular polysaccharide: a novel biopolymer with striking physical properties

The physical properties of the capsular polysaccharide of Rhizobium Trifolii (CPS) were investigated. Viscosity measurements provided information about the hydrodynamic volume of single coils, the perturbation of solvent flow and the shear-thinning behaviour of concentrated solutions. Changes in chain geometry and the development of an intermolecular network as a function of temperature were monitored using the techniques of optical rotation and dynamic oscillation. Finally, analysis of calorimetric thermograms elucidated the type of interactions between CPS and the bacterial levan. Overall, the Rhizobium polysaccharide was found to form thermally-reversible gels at an extremely low 'minimum critical gelling concentration' (c_o∼ 0.35gl^-1). At temperatures above the gel melting point (∼ 48°C), however, the compact polymer coils entangled at comparatively high concentrations (about 60 times higher than c_o). In the presence of a highly branched levan, the thermal stability of ordered CPS structures increased as a consequence of thermodynamic incompatibility between the two polymers.     

茶新菇水溶性多糖的提取及其对氧自由基清除效果的研究

本文以茶新菇为原料提取水溶性多糖,同时在体外进行多糖对氧自由基的效应实验,实验结果表明,当为NaOH浓度为0.77 mol/L,提取时间为2.71 h,料液比为1:88.22(m/v)时,水溶性多糖的最高提取率为2.950 %,茶新菇水溶性多糖对氧自由基具有清除效果,其EC50为1.5 mg/mL.     

竹荪多糖提取工艺及其抗氧化性

以竹荪为原料,采用水提法提取竹荪多糖,比较了提取温度、pH、料液比和提取时间对竹荪多糖得率的影响,并且在单因素实验的基础上,采用正交实验,确定了水提法提取竹荪多糖的最佳工艺参数,即提取温度为90℃、pH为8.0、料液比为1:70 g/mL,时间为2.5 h。在上述提取条件下,提取竹荪多糖得率可达到13.09%。抗氧化实验结果表明,0.6 mg/mL的竹荪多糖对ABTS自由基的清除率可达92.76%,25 mg/mL的竹荪多糖对DPPH自由基的清除率可达70.55%。竹荪多糖提取工艺合理、可行,所提多糖具有较强的抗氧化性。