A new method for the assay of purine metabolic enzymes.
摘要:
我们建立了新的比色法用于检测血清中的腺苷脱氨酶、嘌呤核苷磷酸化酶和鸟氨酸酶的活性,基于黄嘌呤氧化酶作为偶联酶与氢 peroxide 的生成。[化学式] 该方法被发现精确且方便。在检测条件下,正常受试者血清中腺苷脱氨酶、嘌呤核苷磷酸化酶和鸟氨酸酶活性的平均水平分别为5.8±2.2 I. U./L、3.7±2.1 I. U./L和0.5±0.3 I. U./L。
Enzymatic Synthesis of the Ribosylated Glycyl-Uridine Disaccharide Core of Peptidyl Nucleoside Antibiotics
作者:Zheng Cui、Xiaodong Liu、Jonathan Overbay、Wenlong Cai、Xiachang Wang、Anke Lemke、Daniel Wiegmann、Giuliana Niro、Jon S. Thorson、Christian Ducho、Steven G. Van Lanen
DOI:10.1021/acs.joc.8b00855
日期:2018.7.6
Muraymycins belong to a family of nucleoside antibiotics that have a distinctive disaccharide core consisting of 5-amino-5-deoxyribofuranose (ADR) attached to 6′-N-alkyl-5′-C-glycyluridine (GlyU). Here, we functionally assign and characterize six enzymes from the muraymycin biosynthetic pathway involved in the core assembly that starts from uridine monophosphate (UMP). The biosynthesis is initiated
The main aim of this work is to develop and validate two spectrophotometric methods for the quantitativeanalysis of rabeprazole sodium in commercial dosage forms. Method A is based on the reaction of drug with 3-methyl-2-benzothiazolinone hydrazone hydrochloride (MBTH) in the presence of ammonium cerium(IV) nitrate in acetic acid medium at room temperature to form red-brown product which absorbs maximally
这项工作的主要目的是开发和验证两种用于定量测定商业剂型中雷贝拉唑钠的分光光度法。方法A是基于药物与3-甲基-2-苯并噻唑啉酮盐酸盐(MBTH)在硝酸铵铈(IV)的存在下于室温在乙酸介质中反应生成的红棕色产物,该产物在470吸收最大纳米 方法B利用雷贝拉唑钠与1-氯-2,4-二硝基苯(CDNB)在二甲基亚砜(DMSO)中在45 +/- 1摄氏度下反应形成黄色的迈森海默络合物。有色复合物具有在420nm处达到峰值的特征带。在优化的反应条件下,根据ICH指南验证了建议的方法。在14-140和7的浓度范围内遵守比尔定律。5-165微克ml(-1),线性回归方程为A = 6.041 x 10(-4)+1.07 x 10(-2)C和A = 1.020 x 10(-3)+5.0 x 10(-3) C分别代表方法A和B。方法A和B的检出限分别为1.38和0.75 microg ml(-1)。两种方法均已成
A new method for the assay of xanthine oxidase activity.
A colorimetric method for the assay of xanthine oxidase activity, based on the production of hydrogen peroxide, is described. [chemical formula] The precision, accuracy, sensitivity and specificity of the method were found to be satisfactory for the rapid and reliable determination of xanthine oxidase activity.
A slender single crystal based on azine exhibits controllable plastic bending and fluorescence enhancement upon UV light irradiation or acid vapor fuming, as well as elastic bending under external force and mechanoresponsive fluorescence. This is the first smart single crystal exhibiting fluorescence lit up upon bending triggered by UV light irradiation and exposure to acid.