[Objectives]A high performance liquid chromatography-tandem mass spectrometry(HPLC-MS/MS)method was established for the determination of 14β-receptor agonist residues in mutton.[Methods]Samples were hydrolyzed byβ-g...[Objectives]A high performance liquid chromatography-tandem mass spectrometry(HPLC-MS/MS)method was established for the determination of 14β-receptor agonist residues in mutton.[Methods]Samples were hydrolyzed byβ-glucuronidase and extracted with 5%acetic acid-acetonitrile(1:99,V/V)solution.An Eclipse plus C 18 column was used for separation,and the MRM mode was used for qualitative analysis,and the external standard method was used for quantitative analysis of matrix standard solutions.[Results]Under the optimal conditions,the retention time of the 14 kinds ofβ-receptor agonists ranged from 1.0 to 9.5 min.When the mass concentration was in the range of 0.05-0.50μg/ml,the linear relationship ofβ-receptor agonists was good,with correlation coefficients(r)≥0.9992.The detection limits of the method were in the range of 0.04-0.87μg/kg,and the quantitative limits were in the range of 0.35-1.86μg/kg.The average recovery values were in the range of 82.8%-108.9%,with RSDs(n=6)in the range of 1.9%-6.7%.[Conclusions]The method is simple,sensitive,reproducible,accurate,and can be used for simultaneous determination of the 14 kinds ofβ-receptor agonist residues in mutton.展开更多
In recent years,the problem of pesticide residues in Chinese chives has attracted widespread attention from society.This paper comprehensively analyzed the production and planting situation,quality and safety status a...In recent years,the problem of pesticide residues in Chinese chives has attracted widespread attention from society.This paper comprehensively analyzed the production and planting situation,quality and safety status and changes in pesticide standards of Chinese chives,and deeply discussed the main quality and safety problems of Chinese chives and their causes.On this basis,it was proposed to improve the quality and safety level of Chinese chives from three aspects:improving limit standards,promoting green production prevention and control techniques,and strengthening supervision on input products.展开更多
[Objectives]The differences in indices of different peanut oil were found out by analyzing the quality of peanut oil obtained by different oil-making processes.[Methods]The effects of different oil-making processes on...[Objectives]The differences in indices of different peanut oil were found out by analyzing the quality of peanut oil obtained by different oil-making processes.[Methods]The effects of different oil-making processes on the quality of peanut oil were analyzed and compared through the determination of the main physicochemical indices,V_(E) contents and fatty acid compositions of peanut oil obtained by cold pressing,hot pressing and leaching and refining.[Results]The leached refined peanut oil had the lightest color and the lightest fragrance;the hot-pressed peanut oil had the highest V_(E) content;the refractive index,relative density and main fatty acid compositions of the three kinds of peanut oil had no significant differences;and there were trans-fatty acids in the leached refined peanut oil,and the trans-fatty acid contents in the leached refined fresh and aged peanut oil were 1.90%and 4.39%,respectively.The trans-fatty acid content is expected to be a characteristic index to distinguish pressed peanut oil from leached refined peanut oil.[Conclusions]This study can provide a theoretical basis for distinguishing and identifying peanut oil obtained from different oil-making processes.展开更多
基金Supported by The Fourth Batch of High-end Talent Project in Hebei ProvinceTangshan Science and Technology Entrepreneurship and Innovation Leading Talent Project(21130243A).
文摘[Objectives]A high performance liquid chromatography-tandem mass spectrometry(HPLC-MS/MS)method was established for the determination of 14β-receptor agonist residues in mutton.[Methods]Samples were hydrolyzed byβ-glucuronidase and extracted with 5%acetic acid-acetonitrile(1:99,V/V)solution.An Eclipse plus C 18 column was used for separation,and the MRM mode was used for qualitative analysis,and the external standard method was used for quantitative analysis of matrix standard solutions.[Results]Under the optimal conditions,the retention time of the 14 kinds ofβ-receptor agonists ranged from 1.0 to 9.5 min.When the mass concentration was in the range of 0.05-0.50μg/ml,the linear relationship ofβ-receptor agonists was good,with correlation coefficients(r)≥0.9992.The detection limits of the method were in the range of 0.04-0.87μg/kg,and the quantitative limits were in the range of 0.35-1.86μg/kg.The average recovery values were in the range of 82.8%-108.9%,with RSDs(n=6)in the range of 1.9%-6.7%.[Conclusions]The method is simple,sensitive,reproducible,accurate,and can be used for simultaneous determination of the 14 kinds ofβ-receptor agonist residues in mutton.
基金Supported by The Fourth Batch of High-end Talent Project in Hebei ProvinceHebei Provincial Science and Technology Innovation Leading Talents(21130243A)+1 种基金Special Project of the Central Government in Guidance of Local Science and Technology Development(226Z5504G)Tangshan Talent Project(A202202005).
文摘In recent years,the problem of pesticide residues in Chinese chives has attracted widespread attention from society.This paper comprehensively analyzed the production and planting situation,quality and safety status and changes in pesticide standards of Chinese chives,and deeply discussed the main quality and safety problems of Chinese chives and their causes.On this basis,it was proposed to improve the quality and safety level of Chinese chives from three aspects:improving limit standards,promoting green production prevention and control techniques,and strengthening supervision on input products.
文摘[Objectives]The differences in indices of different peanut oil were found out by analyzing the quality of peanut oil obtained by different oil-making processes.[Methods]The effects of different oil-making processes on the quality of peanut oil were analyzed and compared through the determination of the main physicochemical indices,V_(E) contents and fatty acid compositions of peanut oil obtained by cold pressing,hot pressing and leaching and refining.[Results]The leached refined peanut oil had the lightest color and the lightest fragrance;the hot-pressed peanut oil had the highest V_(E) content;the refractive index,relative density and main fatty acid compositions of the three kinds of peanut oil had no significant differences;and there were trans-fatty acids in the leached refined peanut oil,and the trans-fatty acid contents in the leached refined fresh and aged peanut oil were 1.90%and 4.39%,respectively.The trans-fatty acid content is expected to be a characteristic index to distinguish pressed peanut oil from leached refined peanut oil.[Conclusions]This study can provide a theoretical basis for distinguishing and identifying peanut oil obtained from different oil-making processes.
