重组乙肝疫苗纯度高效液相色谱法的研究与应用

[目的]建立检测重组乙肝疫苗(汉逊酵母)纯度的高效液相色谱法(HPLC)。[方法]采用TSK gel G5000PW色谱柱,优化流动相、流速、柱温及p H等参数,确定最佳试验条件;并与TSK gel G3000SW色谱柱检测乙肝纯度的方法进行比较。[结果]确定了最佳试验条件:流动相为0. 01 mmol/L PB(磷酸缓冲液),流速为0. 6 m L/min,柱温为室温(20℃),p H为7. 0,检测波长280 nm;乙肝表面抗原(HBs Ag)在色谱柱TSK gel G5000PW和TSK gel G3000SW的保留时间分别为8. 5 min、17. 5 min;检测时间分别为20 min、40 min。[结论]建立的HPLC方法专属性、重复性良好,更省时、高效,可用于HBs Ag的纯度检测。     

反相高效液相色谱法检测白喉毒素无毒突变体CRM197蛋白纯度

目的 建立反相高效液相色谱法(reverse phase high performance liquid chromatography, RP-HPLC)检测白喉毒素无毒突变体CRM197蛋白纯度。方法 利用Agilent AdvanceBio RP-mAb SB-C8(100 mm×2.1 mm)分析柱和Agilent1260高效液相色谱系统,以含0.1%三氟乙酸水溶液-异丙醇(98∶2)为流动相A,以含0.1%三氟乙酸乙腈溶液为流动相B,进行梯度洗脱,体积流速为0.5 mL/min,检测波长为280 nm,柱温为65℃,进样体积为10μL,采用面积归一法检测CRM197蛋白纯度,并对方法的适用性、专属性、重复性、中间精密度、线性、灵敏度和耐用性指标进行考察。用建立的方法检测CRM197蛋白酸处理供试品溶液、碱处理供试品溶液及3批原液的纯度。结果 建立的方法系统适用性良好;专属性验证表明空白溶液在目标峰积分范围内无干扰峰,热处理CRM197蛋白目标峰与其他杂质峰分离度>1.5;6次重复进样目标峰面积相对标准偏差(relative standard deviation,RSD)为...     

高效液相色谱法检测UV-1164的含量

建立了用高效液相色谱法测定UV-1164含量的方法,用标准品建立工作曲线,采用外标法定量。UV-1164在50mg.L-1~1000 mg.L-1范围内呈良好线性关系,r=0.999,方法的RSD是2.0%,平均回收率是99.8%。     

分子排阻高效液相色谱法检测促胰岛素分泌肽融合蛋白纯度

目的 建立检测促胰岛素分泌肽融合蛋白(Exendin-4-Fc fusion protein,简称E4F4)纯度的分子排阻高效液相色谱法(size exclusion high performance liquid chromatography,SEC-HPLC),并对该方法进行验证.方法 使用Waters 515系列...     

高效液相色谱法同时检测棉花根中的多种植物激素

目的：探寻高效液相色谱同时检测棉花根中多种植物激素含量的方法。方法：采用WatersC18反相色谱柱（4.6×250mm,5μm）,在柱温为35℃、流速为1mL.min-1的条件下,以乙腈和三乙胺溶液为流动相梯度洗脱,在每种物质的保留时间附近切换至最大吸收峰（GA3除外）波长作为检测波长,并与254nm同一波长检测多种植物激素含量的方法进行比较,分离和检测棉花根中的玉米素（Z）、玉米素核苷（ZR）、赤霉酸（GA3）、生长素（IAA）和脱落酸（ABA）的含量。结果：切换波长法检测5种植物激素的灵敏度和回收率均较高,检出限均较低。回收率为：Z 96.82%、ZR 94.14%、GA3 92.75%、IAA 93.38%、ABA 95.57%;检出限为：Z 0.1μg.mL-1、ZR 0.1μg.mL-1、GA3 0.5μg.mL-1、IAA 0.3μg.mL-1;ABA 0.05μg.mL-1,能准确检测出棉花根中Z、ZR、GA3、IAA和ABA的含量。结论：采用Waters C18反相色谱柱（4.6×250mm,5μm）,在柱温为35℃、流速为1mL.min-1的条件下,以乙腈和三乙胺溶液为流动相梯度洗脱,结合切换波长法能同时检测出植物组织中多种植物激素含量。     

高效液相色谱法检测果蔬汁中五种添加剂

目的：运用高效液色谱法对果蔬汁中苯甲酸、安赛蜜、脱氢乙酸、糖精钠以及山梨酸添加剂进行检测。方法：色谱柱：Kromasil 100-5 C18（250mm×4.6mm,5μg）;流动相：甲醇∶0.02mol/L乙酰胺溶液=5∶95（V∶V）;流速：1.0mL/min;进样量：20μL;柱温：30℃;波长：230nm。结果：苯甲酸、安赛蜜、脱氢乙酸、糖精钠以及山梨酸在0.00~0.1mg/mL浓度范围内,均表现为良好的线性关系（r=0.97、r=0.98、r=0.96、r=0.98、r=0.98）。山梨酸、安赛蜜、糖精钠、苯甲酸、脱氢乙酸RSD分别为1.13%、1.01%、1.51%、1.05%、1.18%;平均回收率分别为98%~99%。结论：在液果蔬汁添加剂检测中,高效液相色谱法快速准确,且灵敏度较高,可满足检查需要。     

高效液相色谱法测定月饼中的苯甲酸

关于月饼的苯甲酸检测没有明确的处理和检测方法,按照国标GB/T5009.29-2008的要求第一法气相色谱法和第二法液相色谱法进行检测。气相色谱法前处理涉及有机溶剂的重复萃取,操作时间较长,比较麻烦,液相色谱法也没有明确月饼的前处理方法。本文结合液相色谱法中的试样处理中的方法,对月饼的检测,采用了样品粉碎均匀称样后90度水浴30分钟的方法,加蛋白质沉淀剂定容过滤后直接进样,缩短了检测的时间,提高了工作的效率,适合大批量处理样品。     

高效液相色谱法测定水中草甘膦

文章研究利用高效液相色谱法测定水中草甘膦这一分析方法的有效性。用C₁₈（4.6 mm×250 mm,5μm）色谱柱,以磷酸盐缓冲液、乙腈为磷酸盐缓冲液（35∶65,V/V）为流动相,流速为1.0m L/min,用高效液相色谱法进行测定;检测波长为302 nm。该方法检出限为0.063μg/L,相对标准偏差为0.10%。对于试验中草甘膦的回收率表现出了高度准确性,回收率范围达到了97.6%～100.1%。在10μg/L目标物本底质量浓度下进行加标试验,回收率表现为97.57%;而在100μg/L目标物本底质量浓度下的加标试验中,回收率则显著提高至99.8%;150μg/L目标物本底质量浓度的加标回收率达到了99.2%。该方法检测结果准确、可靠,且回收率较高,适用于检测水中草甘膦。     

用高效液相色谱法检测天然水体中的微囊藻毒素

由于大量氮、磷等物质释放到水体中,导致水体富营养化加剧,水华的发生已成为全球性环境问题。在长江、黄河、松花江等主要河流和太湖、滇池、巢湖等每年都有水华发生。因此建立快速、灵敏、可靠、简便可行的蓝藻毒素检测方法以对毒素进行早期检测和预报是保护水生生态系统和人类健康的关键措施之一。     

重组乙肝疫苗纯度高效液相层析(HPLC)测定方法的改进

为建立重组汉逊酵母乙肝疫苗HPLC检定方法,应用TSK－G5000PW检测系统测定汉逊酵母重组乙肝疫苗表面抗原的纯度,对不同样品处理液的配比浓度和处理时间分别进行了探讨,作者选用DTT／Tween-80作为样品处理效果优于DTT＋Tween-20,1:50Tween-80与0.1mol/L等量混合为样品处理液的适宜浓度。样品处理液与等量样品混匀时间介于35s-2min时,HPLC分离效果好,结果稳定。该处理液及处理时间对CHO细胞及Merck酿酒酵母重组乙肝疫苗表面抗原的HPLC纯度测定无影响。结果表明：现有的HPLC检测系统用0.1mol/L DTT与1：50 Tween-80等量混合处理后能有效地检测不同类型重组乙肝疫苗表面抗原的纯度。     

分散蓝102标准品的制备研究

将商品化的分散蓝102以二甲基甲酰胺溶解,运用制备高效液相色谱制备分散蓝102标准品,纯度大于99%。制备型色谱柱为Waters Xbridge C18柱(5μm,30 mm×150 mm);流动相为10 mmol.L-1碳酸氢铵水溶液和乙腈;流速为30 ml.min-1;检测波长为254 nm;柱温为室温。该方法所得分散蓝102纯度高,可用作分析方法的对照品。     

Inhibition of ribonucleotide reductase by naturally occurring quinols from spores of Agaricus bisporus

gamma-L-glutaminyl-4-hydroxybenzene, a stable phenol found in high concentrations in the gill tissue of the common mushroom, Agaricus bisporus, was shown to be capable of selectively inhibiting DNA synthesis in L1210 leukemia cells. Studies with isolated enzymes and permeabilized L1210 cells revealed that this compound inhibits ribonucleotide reductase ( RNR ) but has no effect on DNA polymerase. The results indicated a good correlation between the inhibition of DNA synthesis and the ability of this compound to inhibit RNR . The concentration of glutaminyl-4-hydroxybenzene required to elicit these inhibitory effects has physiological relevance to the gill tissue during the prodromal period of sporulation.     

The chemistry and biogenesis of the S-containing metabolites of vinyl chloride in rats.

In order to determine whether vinyl chloride yields chloroethylene oxide in vivo, the biogenesis of the various urinary S-containing metabolites in rats has been investigated.N-Acetyl-S-(2-hydroxyethyl)cysteine is a major vinyl chloride metabolite in rats, but according to the method of protective esterification that is used, so either N-acetyl-S-(2-chloroethyl)cysteine or N-acetyl-S-(2-hydroxyethyl)cysteine may be isolated from the body fluids. N-Acetyl-S-vinylcysteine is a second related metabolite. These S-containing vinyl chloride metabolites are not mutagenic in S. typhimurium. Neutral methanol methylates N-acetyl-S-(2-hydroxyethyl)cysteine. N-Acetyl-S-(2-methoxyethyl)cysteine plus N-acetyl-S-vinylcysteine degrade to give the volatile S-(2-methoxyethyl)(prop-1 or 2-enyl)sulphide.Administration of several vinyl chloride metabolites and closely related compounds to rats shows that chloroacetaldehyde and S-(carboxymethyl)cysteine, but not chloroacetic acid, lie on a pathway or pathways connecting vinyl chloride with thiodiglycollic acid. The fact (a) that chloroacetaldehyde affords both thiodiglycollic acid and N-acetyl-S-(2-hydroxyethyl)cysteine in the animal and (b) that S-(carboxymethyl)cysteine has been identified amongst the hydrolytic products from an hepatic extract prepared from vinyl chloride-treated animals is consistent with the formation of chloroacetaldehyde, and with the reaction of chloroethylene oxide or chloroacetaldehyde with glutathione in the presence of a glutathione S-epoxide transferase to give the identified S-containing metabolites.     

六味地黄汤乙醚提取物的初步研究

六味地黄汤为滋阻补肾的群方之魁。为探讨该方滋补作用的物质基础,采用乙醚、氯仿,正丁醇码种不同溶媒提取其不同有效部位。报道了用薄层层析,柱层析、LC－MS法对乙醚萃取部位进行的初步研究。     

Asymmetric bioreduction of racemic 5,6,7,8-tetrahydro-8-methyl-1,3-dimethoxynaphthalen-6-one to the corresponding chiral β-tetralols

The synthesis of racemic 5,6,7,8-tetrahydro-8-methyl-1,3-dimethoxynaphthalen-6-one 1 was performed and the bioreduction to the corresponding β-tetralols was studied with respect to the stereochemical course and optical purity of the products; in particular the 6S,8S enantiomer corresponding to the dimethyl derivative of the natural compound feroxidin was isolated. The biomass of: Aspergillus niger, Cladosporium cladosporioides, Candida lypolitica, Bacillus megatherium, Rhodotorula minuta, R. flava, R. rubra, Beauveria bassiana and Baker's yeast were used as biocatalysts. Relative and absolute configurations of the obtained β-tetralols were established by comparison with those of the natural feroxidin.     

Soluble expression and purification of the functional interleukin-30 protein in Escherichia coli

Interleukin-30 (IL-30), or IL-27p28, is the α subunit of IL-27 constructed by Epstein–Barr virus-induced gene 3 (EBI3) and IL-27p28 binding via noncovalent bonds. IL-30 can be independently secreted and function independently of IL-27. Recent studies demonstrated IL-30 could concurrently antagonize T helper 1 (Th1) and Th17 responses and might have therapeutic implications for controlling autoimmune diseases. However, no reports have stated an efficient method to generate a relatively large quantity of IL-30. In this study, an Escherichia coli expression system for the rapid expression of the mouse IL-30 is developed. For the first time, IL-30 was expressed in a form of soluble fusion protein and purified using a method of simple affinity chromatography. In order to avoid the impact of minor codons on expressing eukaryotic protein in E. coli and to improve the expression quantity, the nucleotide sequence of IL-30 was optimized. The optimized gene sequence was then subcloned into the pET-44a(+) vector, which allowed expression of IL-30 with a fusion tag, NusA. The vector was transformed into E. coli and the expressed fusion protein, NusA-IL-30, was purified by Ni chromatography. Then the fusion tag was removed by cleavage with thrombin. The purity of purified IL-30 was identified using sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) as well as high-performance liquid chromatography (HPLC) and the purity was up to about 92%. The yield of IL-30 was 8.95 mg from 1 L of bacterial culture. Western blot confirmed the identity of the purified protein. The recombinant IL-30 showed its biological activity by inhibiting Th17 differentiating from naive CD4⁺ T cells. Therefore, this method of express and purifying IL-30 provides novel procedures to facilitate structural and functions studies of IL-30.     

New application of Bacillus strains for optically pure l-lactic acid production: general overview and future prospects

Members of the genus Bacillus are considered to be both, among the best studied and most commonly used bacteria as well as the most still unexplored and the most wide-applicable potent bacteria because novel Bacillus strains are continuously being isolated and used in various areas. Production of optically pure l-lactic acid (l-LA), a feedstock for bioplastic synthesis, from renewable resources has recently attracted attention as a valuable application of Bacillus strains. l-LA fermentation by other producers, including lactic acid bacteria and Rhizopus strains (fungi) has already been addressed in several reviews. However, despite the advantages of l-LA fermentation by Bacillus strains, including its high growth rate, utilization of various carbon sources, tolerance to high temperature, and growth in simple nutritional conditions, it has not been reviewed. This review article discusses new findings on LA-producing Bacillus strains and compares them to other producers. The future prospects for LA-producing Bacillus strains are also discussed.