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
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
[Objectives] To screen the optimal extraction conditions of flavonoids from leaves of Paliurus ramosissimus( Lour.) Poir.,measure the content of flavonoids in leaves of P. ramosissimus. using the Microplate Reader,and...[Objectives] To screen the optimal extraction conditions of flavonoids from leaves of Paliurus ramosissimus( Lour.) Poir.,measure the content of flavonoids in leaves of P. ramosissimus. using the Microplate Reader,and provide experimental basis for the development of medicinal resources of P. ramosissimus. [Methods] The ultrasonic extraction method was adopted and orthogonal design was carried out to study the effects of ethanol concentration( A),ultrasonic time( B),the solid-to-liquid ratio( C) on the extraction of flavonoids from leaves of P. ramosissimus. The Microplate Reader was used to measure the content of flavonoids in leaves of P. ramosissimus. in different extraction conditions,P. ramosissimus. and the optimal extraction conditions were used to measure the content of flavonoids from leaves of P. ramosissimus.[Results]Effects of the ultrasonic extraction method on the extraction rate of flavonoids from leaves of P. ramosissimus: extraction times >ethanol concentration > Ultrasound time > solid-liquid ratio. The screened optimal extraction process was: ethanol concentration of 65%,the solid-to-liquid ratio of 1∶ 25,ultrasonic time of 2 h and extraction times Under this condition,the extraction rate of total flavonoids in leaves of P. ramosissimus. was 2. 56%. [Conclusions] This method is simple and feasibility,reliable,and suitable for rapid measurement with large samples.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
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。
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.
基金Supported by Project of Sichuan Provincial Health Department(120385)Project of Sichuan Provincial Science and Technology Department(14JC0137)Project of Luzhou City Department of Science and Technology(2015LZCYDS09(2/8))
文摘[Objectives] To screen the optimal extraction conditions of flavonoids from leaves of Paliurus ramosissimus( Lour.) Poir.,measure the content of flavonoids in leaves of P. ramosissimus. using the Microplate Reader,and provide experimental basis for the development of medicinal resources of P. ramosissimus. [Methods] The ultrasonic extraction method was adopted and orthogonal design was carried out to study the effects of ethanol concentration( A),ultrasonic time( B),the solid-to-liquid ratio( C) on the extraction of flavonoids from leaves of P. ramosissimus. The Microplate Reader was used to measure the content of flavonoids in leaves of P. ramosissimus. in different extraction conditions,P. ramosissimus. and the optimal extraction conditions were used to measure the content of flavonoids from leaves of P. ramosissimus.[Results]Effects of the ultrasonic extraction method on the extraction rate of flavonoids from leaves of P. ramosissimus: extraction times >ethanol concentration > Ultrasound time > solid-liquid ratio. The screened optimal extraction process was: ethanol concentration of 65%,the solid-to-liquid ratio of 1∶ 25,ultrasonic time of 2 h and extraction times Under this condition,the extraction rate of total flavonoids in leaves of P. ramosissimus. was 2. 56%. [Conclusions] This method is simple and feasibility,reliable,and suitable for rapid measurement with large samples.
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。
