A new method for the determination of antithrombotic activity of egg white protein hydrolysate (EWPH) was developed using a microplate reader. Reaction was carried out at 37℃and pH 7.2 with fibrinogen concentration...A new method for the determination of antithrombotic activity of egg white protein hydrolysate (EWPH) was developed using a microplate reader. Reaction was carried out at 37℃and pH 7.2 with fibrinogen concentration 0.1%. Microplate reading was conducted at 405 nm. Inhibition rate of EWPH on thrombin activity showed linearity (R2 = 0.9971), when the inhibition rate was in the range of 10-90%. The lower limit of detection (LLD, at 99.7% probability) and the biological limit of detection (BLD, at 99.7% probability) of the method were 10.643 and 40 mg/mL, respectively. The repeatability standard deviation (R.S.D.) was 1.08%. The standard deviation of the method was ±0.027 AT-U.展开更多
为了提高植物中γ-氨基丁酸的检测效率和准确性,对用酶标仪测定麦苗中γ-氨基丁酸含量的方法进行了提取方式、反应试剂用量、波长选取和测定时间等参数的优化研究,并对检测结果进行了分析。结果表明,酶标仪测量γ-氨基丁酸的最佳条件为...为了提高植物中γ-氨基丁酸的检测效率和准确性,对用酶标仪测定麦苗中γ-氨基丁酸含量的方法进行了提取方式、反应试剂用量、波长选取和测定时间等参数的优化研究,并对检测结果进行了分析。结果表明,酶标仪测量γ-氨基丁酸的最佳条件为:55℃超声波提取30 min,当待测液为1 m L时,需2 mol·L-1氯化铝0.4 m L,1 mol·L-1氢氧化钾1.0 m L,0.2 mol·L-1p H值10.0的缓冲液1.0 m L,6%重蒸酚1.5 m L,5%次氯酸钠1 m L,最适测量波长为635μm,测定时间为反应后100~160 min。该检测方法稳定性高,重现性好。展开更多
本实验利用3,5-二硝基水杨酸(DNS)比色法对番茄果实总糖含量进行了测定,并初步建立了微型化DNS比色法测定总糖含量的实验方法和DNS比色法测定番茄总糖含量的最佳条件,对影响测定结果的因素:测定波长、显色剂用量、显色时间进行了单因素...本实验利用3,5-二硝基水杨酸(DNS)比色法对番茄果实总糖含量进行了测定,并初步建立了微型化DNS比色法测定总糖含量的实验方法和DNS比色法测定番茄总糖含量的最佳条件,对影响测定结果的因素:测定波长、显色剂用量、显色时间进行了单因素试验。结果表明,540 nm波长、0.2 m L DNS、沸水浴4 min为最佳测定条件。该最佳测定条件下,葡萄糖含量在20~200μg与吸光值呈良好的线性关系。利用得到优化方法对4个番茄品种的总糖含量进行了测定,结果表明测定样品在1.5 h内的吸光值较为稳定,RSD为2.19%~2.88%。本研究得到番茄果实总糖含量测定的优化方法,是一种稳定、高效可行的测定方法,为番茄高糖品种的鉴定和筛选提供了依据。展开更多
文摘A new method for the determination of antithrombotic activity of egg white protein hydrolysate (EWPH) was developed using a microplate reader. Reaction was carried out at 37℃and pH 7.2 with fibrinogen concentration 0.1%. Microplate reading was conducted at 405 nm. Inhibition rate of EWPH on thrombin activity showed linearity (R2 = 0.9971), when the inhibition rate was in the range of 10-90%. The lower limit of detection (LLD, at 99.7% probability) and the biological limit of detection (BLD, at 99.7% probability) of the method were 10.643 and 40 mg/mL, respectively. The repeatability standard deviation (R.S.D.) was 1.08%. The standard deviation of the method was ±0.027 AT-U.
文摘为了提高植物中γ-氨基丁酸的检测效率和准确性,对用酶标仪测定麦苗中γ-氨基丁酸含量的方法进行了提取方式、反应试剂用量、波长选取和测定时间等参数的优化研究,并对检测结果进行了分析。结果表明,酶标仪测量γ-氨基丁酸的最佳条件为:55℃超声波提取30 min,当待测液为1 m L时,需2 mol·L-1氯化铝0.4 m L,1 mol·L-1氢氧化钾1.0 m L,0.2 mol·L-1p H值10.0的缓冲液1.0 m L,6%重蒸酚1.5 m L,5%次氯酸钠1 m L,最适测量波长为635μm,测定时间为反应后100~160 min。该检测方法稳定性高,重现性好。
文摘本实验利用3,5-二硝基水杨酸(DNS)比色法对番茄果实总糖含量进行了测定,并初步建立了微型化DNS比色法测定总糖含量的实验方法和DNS比色法测定番茄总糖含量的最佳条件,对影响测定结果的因素:测定波长、显色剂用量、显色时间进行了单因素试验。结果表明,540 nm波长、0.2 m L DNS、沸水浴4 min为最佳测定条件。该最佳测定条件下,葡萄糖含量在20~200μg与吸光值呈良好的线性关系。利用得到优化方法对4个番茄品种的总糖含量进行了测定,结果表明测定样品在1.5 h内的吸光值较为稳定,RSD为2.19%~2.88%。本研究得到番茄果实总糖含量测定的优化方法,是一种稳定、高效可行的测定方法,为番茄高糖品种的鉴定和筛选提供了依据。