变色酸-分光光度法测定丝氨酸含量

建立了变色酸-分光光度法测定丝氨酸含量的方法。丝氨酸在一定的pH条件下经高碘酸钠氧化后能与变色酸发生发应,产物在570 nm处有最大吸光值,且吸光值与丝氨酸的含量呈一次线性关系。结果表明,丝氨酸在0-1.0 g.L-1范围内呈良好的线性关系(r=0.9973),平均加样回收率为100.30%,RSD为1.11%。将测量结果与高效液相测量结果做比较,两种方法的相符率达到99%至101%。变色酸-分光光度法操作简便,结果准确。     

L-天冬氨酸-α-脱羧酶的重组表达、定点突变及高通量检测方法的建立

将枯草芽孢杆菌L-天冬氨酸-α-脱羧酶基因进行了克隆和异源表达,并通过定点突变构建了2个突变体。针对该酶活力检测时存在的检测通量低、周期长和成本高等缺点,旨在建立一种简单高效的酶活力高通量检测方法。采用氯酚红(CPR)指示剂和4-吗啉乙磺酸(MES)缓冲液体系,并对检测条件进行优化,提高检测的准确性和灵敏性,建立了基于比色法的微孔板高通量检测方法,然后以L-天冬氨酸-α-脱羧酶及其突变体作为模型酶,对高通量检测方法进行了验证。优化后的酶活检测条件为MES缓冲液2 mmol/L,CPR指示剂75 μmol/L,L-天冬氨酸75 mmol/L,pH 6.5,温度37℃,反应时间10 min,检测波长为567 nm。采用3种模型酶对微孔板高通量检测方法进行了验证,结果显示该方法与HPLC法测得的结果一致。高通量检测方法具有操作简便易行、灵敏度高等优点,能够用于L-天冬氨酸-α-脱羧酶的快速检测。该方法的建立将为L-天冬氨酸-α-脱羧酶进行定向进化及突变体的高通量筛选奠定基础。     

一种测定蛹虫草中虫草酸含量的酶标仪微量反应方法

研究和建立一种基于酶标仪-96孔板高通量测定虫草酸含量的检测方法,并对该方法进行性能评价。以酶标仪为检测仪器,在96孔板内按照设定反应条件微量加入样品和试剂进行显色反应,利用酶标仪测定吸光度值并计算虫草酸含量。通过检测精密度、重复性、回收率,并与分光光度计法进行比较,综合评价该方法的准确度、精确度。结果表明,测定数据具有较高的精密度(样品CM1的RSD值0.829%;样品CM2的RSD值1.772%)、重复性(标准样品B40的RSD值2.061%;样品CM2的RSD值1.599%)、回收率(平均回收率99.24%,RSD值3.666%),测定结果与分光光度法检测结果无显著差异(P>0.05)。结果表明,酶标仪微量法测定准确、重复性好,并可大大减少样品和试剂的用量,该方法方便、快捷、高效,可以替代分光光度法用于虫草酸含量的测定。     

静脉注射人免疫球蛋白中IgG含量的测定方法的比较

目的:对IgG的检测方法———紫外分光光度法和免疫单扩散方法进行比较。方法:采用紫外分光光度法和免疫单扩散法对样品进行IgG含量测定,然后对结果进行分析。结果:两种方法测定的结果差异无显著性(P>0.05)。紫外分光法操作更方便、快捷,准确。     

基于SYBR Green I的双链DNA定量方法

摘要 基于SYBR Green I荧光染料与双链DNA（dsDNA）结合产生荧光的原理,建立一种高精度、高通量的双链DNA 定量方法。将梯度稀释后的基因组DNA及已知浓度的?DNA与等体积的SYBR Green I（4×）充分混合后,利用荧光定量PCR仪采集荧光信号,以ROX（1×）作为校正染料进行定量分析;同时利用紫外分光光度计对样品进行平行测定,比较该方法与紫外分光光度法的检测限与准确度。紫外分光光度法的检测限为2 ng/?l,而SYBR Green I荧光定量法的检测限可达到0.015 ng/?l,并且在0.015~2 ng/?l范围内,SYBR Green I荧光强度与?DNA浓度呈线性关系（R2=0.9999）,比紫外分光光度法灵敏100倍以上,并可准确定量低纯度的DNA样品。此方法具有重复性好、高通量的特点,仅需少量的生物样本即可满足定量要求,为分子生物学研究及临床检验等多个领域提供了一种可靠的dsDNA定量方法。     

微生物法生产L-丝氨酸代谢工程研究进展

L-丝氨酸是生物体内一种重要的中间代谢产物,为甘氨酸等多种氨基酸、核苷酸、胆碱、磷脂的合成前体,现已广泛应用于医药、食品、化妆品等领域。L-丝氨酸的生产方法有蛋白质水解提取法、化学合成法、转化法及微生物发酵法,其中微生物发酵法具有原料廉价、环境污染小、产物纯度高等优点。系统综述了微生物发酵法生产L-丝氨酸所涉及的代谢工程策略,包括微生物合成L-丝氨酸的各种代谢调控机制及相应采取的改造措施和效果,并探讨了L-丝氨酸育种技术未来的发展趋势。     

紫外可见分光光度法测定杜仲绿原酸含量的方法研究

目前,测定绿原酸含量的方法很多,常采用毛细管电泳法、ＨＰＬＣ法、可见分光光度法和纸层析-紫外可见分光光度法等[1,2,3,4]。但样品处理均采用索氏回流提取,后经层析分离洗脱等步骤,时间长、效率低。本文采用紫外可见分光光度法测定绿原酸含量,只需超声波提取一小时,不经...     

测定血中亚硝酸盐的荧光分光光度法

目的:建立检测血中亚硝酸盐的荧光分光光度法.方法:采用硫酸-磷钨酸去蛋白预处理的方法排除血红蛋白等对测定的干扰,以2,3-二氨基萘与亚硝酸盐反应生成荧光化合物,用荧光分光光度法测定.结果:血标本以硫酸-磷钨酸去蛋白预处理2次,2,3-二氨基萘浓度为0.63 mmol·L-1,反应液和终止反应后pH值各为1.60和1.70,20℃水浴15 min是较适测定条件.检出限24.27 nmol·L-1.健康人血清亚硝酸盐含量为(10.91±2.38)μmol·L-1,95%分布范围为(6.24～15.57)μmol·L-1.结论:本法较为敏感、特异、简便,对一氧化氮的研究有一定价值.     

青海蚕豆中原花青素和左旋多巴的含量测定和品种间差异的比较

目的：建立青海蚕豆中左旋多巴和原花青素含量测定方法,测量22批样品的含量。方法：采用紫外分光光度法测量原花青素的含量,检测波长为554nm。采用HPLC法检测蚕豆中L-多巴含量：色谱柱：汉邦ODS-2（250mm×4-6mm,5μm）,流动相：甲醇-0-1mol/L冰醋酸溶液（5∶95）;流速：0-8 mL/min;测定波长：280 nm;柱温：25/3℃;进样量：20μL。结果：原花青素在75~375μg/mL范围内线性良好、L-多巴在75~375μg/mL范围内线性良好。结论：青海蚕豆中左旋多巴和原花青素含量测定方法稳定可靠。     

基于微孔板的高通量筛选6-羟基烟酸转化菌方法的建立

建立了一种基于96孔板-酶标仪的双波长紫外分光光度法高通量筛选6-羟基烟酸转化菌的方法.实验以251nm为测定波长、231nm为参比波长测定转化样品的6-羟基烟酸含量,6-羟基烟酸与△A251-231在0.5～11 μg/mL浓度范围内有良好的线性关系,服从朗伯-比尔定律,平均回收率为99.11%～100.81%.利用96孔板-酶标仪,每天筛选量可达到2000～5000个反应,达到高通量筛选要求.     

Antibody-based fluorescence detection of kinase activity on a peptide array

Peptide-based microarrays allow for high-throughput identification of protein kinase substrates. However, current methods of detecting kinase activity require the use of radioisotopes. We have developed a novel fluorescence-based approach for quantitative detection of peptide phosphorylation on chip using fluorescently-labeled anti-phosphoserine and anti-phosphotyrosine antibodies. This method is sensitive, specific and extremely fast, presenting obvious advantages and may find wider uses in high-throughput kinase screenings.     

Effects of L-serine supplementation on the daily rhythms of growth hormone and corticosterone concentrations in mice

The impact of L-serine on the daily rhythms of growth hormone (GH) and corticosterone remains unknown. We explored whether the daily rhythms of these hormones were affected by L-serine supplementation as well as the supplementation time. The results showed that plasma GH concentration at Zeitgeber time (ZT)4 and 8 were significantly increased by L-serine supplementation at ZT22, while the diurnal rhythms peaks of plasma corticosterone at ZT12 were suppressed by L-serine supplementation at ZT10. After the supplementation was stopped, the effects of L-serine on the diurnal rhythms of plasma GH and corticosterone lasted for 2 days then they were fading on day 4. L-serine concentrations in plasma and hypothalamus after supplementation at ZT22 was lower than those after supplementation at ZT10. In conclusion, L-serine modulates the daily rhythms of GH and corticosterone depending on its supplementation time. The modulation effect might be association with the daily rhythms of L-serine metabolism.     

Dependency on serine concentration of the activity of tryptophan synthase. Cooperative properties

The activity of the enzyme tryptophan synthase from Escherichia coli was tested as a function of the concentration of L-serine which serves as a substrate in the indole to tryptophan reaction as well as for the L-serine deaminase activity. L-Serine binding was found to follow the pattern of negative cooperativity both by kinetic and by equilibrium methods. The enzyme kinetic data support the view that a rapid equilibration model for the enzyme . substrates complex formation is not strictly obeyed.     

Enzymatic synthesis of L-tryptophan from hair acid hydrolysis industries wastewater with tryptophan synthase

An effective method for production of L-tryptophan from hair acid hydrolysis wastewater (HHW) containing L-serine was developed by recombinant tryptophan synthase. This study provides us with an alternative HHW utilization strategy. Tryptophan synthase could efficiently convert L-serine contained in HHW to L-tryptophan at pH 8.0, 40°C and Tween-80 of 0.04%. The enzyme also showed high tolerance to ammonium chloride, a component in HHW. In a scale up study, L-serine conversion rate reach 95.1% with a final L-tryptophan concentration of 33.2 g l(-1).     

High-throughput DNA isolation method for detection of Xylella fastidiosa in plant and insect samples

We report an inexpensive, high-throughput method for isolating DNA from insect and plant samples for the purpose of detecting Xylella fastidiosa infection. Existing methods often copurify inhibitors of DNA polymerases, limiting their usefulness for PCR-based detection assays. When compared to commercially available kits, the method provides enhanced pathogen detection at a fraction of the cost.     

微生物高通量快速检测技术研究进展

微生物在大自然中广泛存在,特别是食源性致病菌是引发食源性疾病的主要因素,传统的检测技术已难以适应疾病预防控制和基层监管执法的需求,因此更加快速灵敏的高通量检测技术成为研究的热点。在对微生物快速准确识别方面,主要包括双功能抗体、核酸适配体筛选和噬菌体鉴定等方法。在多目标检测方面,主要包括多重PCR、基质辅助激光解吸电离飞行时间质谱和生物芯片等方法。本文对每种方法的原理、优缺点及应用研究现状进行了较为系统的介绍,以期为今后微生物高通量检测技术的快速发展提供参考。     

甲基营养型L-丝氨酸产生菌的选育

以甲基营养型假单胞菌J-12为出发菌株,经硫酸二乙酯（DES）和亚硝基胍（NTG）诱变处理,D-丝氨酸结构类似物平板和高浓度甘氨酸平板定向筛选,获得1株三-丝氨酸高产菌N-13,其发酵液中L-丝氨酸产量较出发菌株提高97．9％。在含有20g/L甘氨酸和7mL／L甲醇的培养基中,L-丝氨酸积累可达4．81g／L。     

From RNA-seq reads to differential expression results

Many methods and tools are available for preprocessing high-throughput RNA sequencing data and detecting differential expression.     

甲基营养菌Methylobacterium sp.MB200中与L-丝氨酸耐受性相关基因的克隆与分析

甲基营养菌MB200,能利用非C-C键低碳化合物生长并合成L-丝氨酸,对L-丝氨酸耐受浓度低,提高其在静息细胞反应系统中对L-丝氨酸的耐受能力可更好的提高L-丝氨酸的产量.利用质粒转座子pTnMod-RKm'构建了甲基营养菌MB200的突变体库,往培养基中添加20 mg/mL L-丝氨酸对突变体库中的突变体进行平板筛选...