Dear Editor,Globally,approximately two billion people suffer from micronutrient deficiencies(Tulchinsky,2010;Myers et al.,2014).Soil micronutrient availability is of great importance for the evaluation of soil fertili...Dear Editor,Globally,approximately two billion people suffer from micronutrient deficiencies(Tulchinsky,2010;Myers et al.,2014).Soil micronutrient availability is of great importance for the evaluation of soil fertility and the determination of appropriate measures for improving crop quality and human health.The diethylenetriamine-penta-acetic(DTPA)extraction method is used for the simultaneous measurement of available iron(Fe),manganese(Mn),copper(Cu),and zinc(Zn)in near-neutral and calcareous soils(Lindsay and Norvell,1978),and the procedures involve soil preparatioru grinding,and extraction.展开更多
Glucose is an indispensable nutrient for metabolism in living organisms and is widely used in food,industry,and medical fields.Glucose is often added as a sweetener in food and often used in industry as a reducing age...Glucose is an indispensable nutrient for metabolism in living organisms and is widely used in food,industry,and medical fields.Glucose is often added as a sweetener in food and often used in industry as a reducing agent for various products.In medical treatment,glucose is added to many drugs as a nutritional additive,and it is also an indicator that diabetics need to pay attention to at all time.Therefore,the market has a great demand for low-cost,high-sensitivity,fast,and convenient glucose sensors,and the industry has always attached great importance to the work of creating new glucose sensor devices.Therefore,we proposed a SnO_(2)nanofibers/Au structure multimode-single-mode-multimode(MSM)fiber surface plasmon resonance(SPR)glucose sensor.SnO_(2)nanofibers were fixed to a single-mode fiber core that had been plated with the Au film by electrospinning.When the glucose concentration increased at 5 vol%intervals,the corresponding resonance wavelengths had different degrees of redshifts.Comparing the two structures,as the glucose concentration range increased from 0 vol%to 60 vol%,the sensitivity increased from 228.7 nm/vol%in the Au structure to 337.3 nm/vol%in the SnO_(2)nanofiber/Au structure.At the same time,the linear correlation between the resonant wavelength and the refractive index of the two structures was greater than 0.98.Moreover,the SnO_(2)nanofibers/Au structure significantly improved the practical application performance of SPR sensors.展开更多
基金supported by the National Key Research and Development Program of China(No.2018YFD 0200401)the China Agricultural Research System of MOF and MARA(CARS-03)+1 种基金the Science and Technology Innovation Fund Program of Shanxi Agricultural University,China(No.2020BQ72)the Incentive Funding Research Program for Doctor Graduates Working in Shanxi Province,China(No.SXBYKY2021030)。
文摘Dear Editor,Globally,approximately two billion people suffer from micronutrient deficiencies(Tulchinsky,2010;Myers et al.,2014).Soil micronutrient availability is of great importance for the evaluation of soil fertility and the determination of appropriate measures for improving crop quality and human health.The diethylenetriamine-penta-acetic(DTPA)extraction method is used for the simultaneous measurement of available iron(Fe),manganese(Mn),copper(Cu),and zinc(Zn)in near-neutral and calcareous soils(Lindsay and Norvell,1978),and the procedures involve soil preparatioru grinding,and extraction.
基金support from the Natural Science Foundation of Liaoning Province,China(Grant No.2021-MS-082).
文摘Glucose is an indispensable nutrient for metabolism in living organisms and is widely used in food,industry,and medical fields.Glucose is often added as a sweetener in food and often used in industry as a reducing agent for various products.In medical treatment,glucose is added to many drugs as a nutritional additive,and it is also an indicator that diabetics need to pay attention to at all time.Therefore,the market has a great demand for low-cost,high-sensitivity,fast,and convenient glucose sensors,and the industry has always attached great importance to the work of creating new glucose sensor devices.Therefore,we proposed a SnO_(2)nanofibers/Au structure multimode-single-mode-multimode(MSM)fiber surface plasmon resonance(SPR)glucose sensor.SnO_(2)nanofibers were fixed to a single-mode fiber core that had been plated with the Au film by electrospinning.When the glucose concentration increased at 5 vol%intervals,the corresponding resonance wavelengths had different degrees of redshifts.Comparing the two structures,as the glucose concentration range increased from 0 vol%to 60 vol%,the sensitivity increased from 228.7 nm/vol%in the Au structure to 337.3 nm/vol%in the SnO_(2)nanofiber/Au structure.At the same time,the linear correlation between the resonant wavelength and the refractive index of the two structures was greater than 0.98.Moreover,the SnO_(2)nanofibers/Au structure significantly improved the practical application performance of SPR sensors.
