[Objectives] To establish a determination method for the content of total lignanoids in Tangjiangshenkang granules. [Methods] Two-wavelength ultraviolet spectrophotometry (TWBS) was used to scan arctiin control soluti...[Objectives] To establish a determination method for the content of total lignanoids in Tangjiangshenkang granules. [Methods] Two-wavelength ultraviolet spectrophotometry (TWBS) was used to scan arctiin control solution, chlorogenic acid control solution and Tangjiangshenkang granule test solution in the range of 200-400 nm. In the ultraviolet scanning diagram of arctiin reference solution, the maximum absorption wavelength of 280 nm was determined as the determination wavelength λ 1, the detection wavelength in the ultraviolet scanning diagram of chlorogenic acid reference solution ( λ 1=280 nm) was determined, and 350 nm was the reference wavelength λ 2;the content of total lignosides in Tangjiangshenkang granules was determined with arctiin as the reference substance. [Results] The precision, accuracy, and durability of this method were fine. The concentration of arctiin was linearly correlated with the absorbance difference in the range of 0.007 95-0.071 55 mg/mL ( r =0. 999 9). The average recovery of arctiin was 100.8%, and the RSD value was 1.04% ( n =6). Calculated as arctiin, three batches of Tangjiangshenkang granules contain no less than 20% of total lignosides. [Conclusions] The method has the advantages of simple operation, good accuracy, precision and reliable stability. It can be used as the content determination and quality control method of total lignosides in Tangjiangshenkang granules.展开更多
A new dual-wavelength dual-indicator catalytic kinetic spectrophotometric method for the determination of trace Ru(III)was studied.This method was based on Ru(III)-catalyzing oxidation of Arsenazo I and indigo carmine...A new dual-wavelength dual-indicator catalytic kinetic spectrophotometric method for the determination of trace Ru(III)was studied.This method was based on Ru(III)-catalyzing oxidation of Arsenazo I and indigo carmine by potassium bromate in sulfuric acid.The absorbances of the catalytic and noncatalytic systems were measured at 510 and610 nm,respectively.Under the optimum conditions,the linear range of determination is 0–0.12 lgáml-1and the detection limit is 1.21 9 10-4lgáml-1.The method was applied for the determination of trace Ru(III)in ore samples with satisfactory results.展开更多
Due to the wide application of UV-A(320 nm–400 nm)and UV-C(200 nm–280 nm)photodetectors,dual-wavelength(UV-A/UV-C)photodetectors are promising for future markets.A dual-wavelength UV photodetector based on vertical(...Due to the wide application of UV-A(320 nm–400 nm)and UV-C(200 nm–280 nm)photodetectors,dual-wavelength(UV-A/UV-C)photodetectors are promising for future markets.A dual-wavelength UV photodetector based on vertical(Al,Ga)N nanowires and graphene has been demonstrated successfully,in which graphene is used as a transparent electrode.Both UV-A and UV-C responses can be clearly detected by the device,and the rejection ratio(R254 nm/R450 nm)exceeds35 times at an applied bias of-2 V.The short response time of the device is less than 20 ms.Furthermore,the underlying mechanism of double ultraviolet responses has also been analyzed systematically.The dual-wavelength detections could mainly result from the appropriate ratio of the thicknesses and the enough energy band difference of(Al,Ga)N and Ga N sections.展开更多
[Objective]The aim was to find a way to measure the cholesterol content in deserted oil.[Method]Dual-wavelength spectrophotometry method was used for the determination of cholesterol in edible oil.630 nm and 720 nm we...[Objective]The aim was to find a way to measure the cholesterol content in deserted oil.[Method]Dual-wavelength spectrophotometry method was used for the determination of cholesterol in edible oil.630 nm and 720 nm were set as target band and reference band in this method,respectively.The result was compared to liquid chromatography method.[Result]The relative standard deviation(RSD)was at 1.26% and recovery was between 101.9% and 110.7%.Linear range was 8.0-40.0 μg/ml.The tested result was close to the result of liquid chromatography.[Conclusion]It was proved that this method was easy,fast and accurate.The disturbance of sitosterol was eliminated without isolation.It can be used for fast identification of the authenticity of waste fat.展开更多
Three—layer back—propagation neural networks were used for processing the information provided by the ultraviolet spectra of five—component mixtures, affecting the simultaneous determination of the components with ...Three—layer back—propagation neural networks were used for processing the information provided by the ultraviolet spectra of five—component mixtures, affecting the simultaneous determination of the components with satisfactory results.展开更多
为建立一种脱色评价的方法,以样品吸光度曲线的曲线下面积(area under the curve,AUC)作为脱色率计算依据,将AUC应用于枸杞多糖的脱色工艺考察中,探究枸杞多糖的最佳脱色工艺条件。采用紫外-可见分光光度计,在200~760 nm处对3种色素(原...为建立一种脱色评价的方法,以样品吸光度曲线的曲线下面积(area under the curve,AUC)作为脱色率计算依据,将AUC应用于枸杞多糖的脱色工艺考察中,探究枸杞多糖的最佳脱色工艺条件。采用紫外-可见分光光度计,在200~760 nm处对3种色素(原花青素、叶绿素铜钠、β-胡萝卜素)的溶液分别进行全波长扫描,采用Origin软件统计脱色前后样品液的AUC,用于计算脱色率。将AUC脱色计算方式引入到枸杞多糖的脱色工艺考察,筛选不同类型大孔树脂的脱色效果,并通过单因素与正交试验确定最佳脱色条件。结果表明:上述3种色素分别在0.98~31.25、3.92~125.00、0.39~12.50μg/mL范围内线性关系良好,R2≥0.998 6,平均加标回收率分别为101.86%、100.08%、100.68%,相对标准偏差(relative standard deviation,RSD)分别为2.66%、2.27%、2.55%。采用AUC脱色率计算方法,枸杞多糖粗品采用S8大孔树脂脱色,最佳脱色工艺条件为每100 mg多糖粗品使用S8树脂量为7.5 g、粗品浓度为3.0 g/L、在35℃下脱色时间为60 min。在该脱色工艺条件下,脱色率的平均值为73.01%,RSD为1.01%,说明稳定性良好。展开更多
基金Supported by Major Science and Technology Project"Major New Drug Innovation".
文摘[Objectives] To establish a determination method for the content of total lignanoids in Tangjiangshenkang granules. [Methods] Two-wavelength ultraviolet spectrophotometry (TWBS) was used to scan arctiin control solution, chlorogenic acid control solution and Tangjiangshenkang granule test solution in the range of 200-400 nm. In the ultraviolet scanning diagram of arctiin reference solution, the maximum absorption wavelength of 280 nm was determined as the determination wavelength λ 1, the detection wavelength in the ultraviolet scanning diagram of chlorogenic acid reference solution ( λ 1=280 nm) was determined, and 350 nm was the reference wavelength λ 2;the content of total lignosides in Tangjiangshenkang granules was determined with arctiin as the reference substance. [Results] The precision, accuracy, and durability of this method were fine. The concentration of arctiin was linearly correlated with the absorbance difference in the range of 0.007 95-0.071 55 mg/mL ( r =0. 999 9). The average recovery of arctiin was 100.8%, and the RSD value was 1.04% ( n =6). Calculated as arctiin, three batches of Tangjiangshenkang granules contain no less than 20% of total lignosides. [Conclusions] The method has the advantages of simple operation, good accuracy, precision and reliable stability. It can be used as the content determination and quality control method of total lignosides in Tangjiangshenkang granules.
基金supported by the National Natural Science Foundation of China (No. 51273172)
文摘A new dual-wavelength dual-indicator catalytic kinetic spectrophotometric method for the determination of trace Ru(III)was studied.This method was based on Ru(III)-catalyzing oxidation of Arsenazo I and indigo carmine by potassium bromate in sulfuric acid.The absorbances of the catalytic and noncatalytic systems were measured at 510 and610 nm,respectively.Under the optimum conditions,the linear range of determination is 0–0.12 lgáml-1and the detection limit is 1.21 9 10-4lgáml-1.The method was applied for the determination of trace Ru(III)in ore samples with satisfactory results.
基金the National Key Research and Development Program of China(Grant No.2018YFB0406602)Natural Science Foundation of Jiangsu Province,China(Grant No.BK20180252)+6 种基金Key Research Program of Frontier Sciences,CAS(Grant No.ZDBS-LY-JSC034)the National Natural Science Foundation of China(Grant Nos.61804163,61875224,and 61827823)the Key Research and Development Program of Jiangsu Province,China(Grant No.BE2018005)Natural Science Foundation of Jiangxi Province,China(Grant No.20192BBEL50033)Research Program of Scientific Instrument,Equipment of CAS(Grant No.YJKYYQ20200073)SINANO(Grant Nos.Y8AAQ21001 and Y4JAQ21001)Vacuum Interconnected Nanotech Workstation(Grant Nos.Nano-X and B2006)。
文摘Due to the wide application of UV-A(320 nm–400 nm)and UV-C(200 nm–280 nm)photodetectors,dual-wavelength(UV-A/UV-C)photodetectors are promising for future markets.A dual-wavelength UV photodetector based on vertical(Al,Ga)N nanowires and graphene has been demonstrated successfully,in which graphene is used as a transparent electrode.Both UV-A and UV-C responses can be clearly detected by the device,and the rejection ratio(R254 nm/R450 nm)exceeds35 times at an applied bias of-2 V.The short response time of the device is less than 20 ms.Furthermore,the underlying mechanism of double ultraviolet responses has also been analyzed systematically.The dual-wavelength detections could mainly result from the appropriate ratio of the thicknesses and the enough energy band difference of(Al,Ga)N and Ga N sections.
基金Supported by National Quality Inspection Bureau(KJ092102,2009QK146)
文摘[Objective]The aim was to find a way to measure the cholesterol content in deserted oil.[Method]Dual-wavelength spectrophotometry method was used for the determination of cholesterol in edible oil.630 nm and 720 nm were set as target band and reference band in this method,respectively.The result was compared to liquid chromatography method.[Result]The relative standard deviation(RSD)was at 1.26% and recovery was between 101.9% and 110.7%.Linear range was 8.0-40.0 μg/ml.The tested result was close to the result of liquid chromatography.[Conclusion]It was proved that this method was easy,fast and accurate.The disturbance of sitosterol was eliminated without isolation.It can be used for fast identification of the authenticity of waste fat.
基金Project supported by National Natural Science Foundatlon of China.
文摘Three—layer back—propagation neural networks were used for processing the information provided by the ultraviolet spectra of five—component mixtures, affecting the simultaneous determination of the components with satisfactory results.
文摘为建立一种脱色评价的方法,以样品吸光度曲线的曲线下面积(area under the curve,AUC)作为脱色率计算依据,将AUC应用于枸杞多糖的脱色工艺考察中,探究枸杞多糖的最佳脱色工艺条件。采用紫外-可见分光光度计,在200~760 nm处对3种色素(原花青素、叶绿素铜钠、β-胡萝卜素)的溶液分别进行全波长扫描,采用Origin软件统计脱色前后样品液的AUC,用于计算脱色率。将AUC脱色计算方式引入到枸杞多糖的脱色工艺考察,筛选不同类型大孔树脂的脱色效果,并通过单因素与正交试验确定最佳脱色条件。结果表明:上述3种色素分别在0.98~31.25、3.92~125.00、0.39~12.50μg/mL范围内线性关系良好,R2≥0.998 6,平均加标回收率分别为101.86%、100.08%、100.68%,相对标准偏差(relative standard deviation,RSD)分别为2.66%、2.27%、2.55%。采用AUC脱色率计算方法,枸杞多糖粗品采用S8大孔树脂脱色,最佳脱色工艺条件为每100 mg多糖粗品使用S8树脂量为7.5 g、粗品浓度为3.0 g/L、在35℃下脱色时间为60 min。在该脱色工艺条件下,脱色率的平均值为73.01%,RSD为1.01%,说明稳定性良好。