The status of PCDDs and PCDFs content in retail foods from a certain area by Isotope Dilution HRGC-HRMS was surveyed and the local population PCDD/Fs exposure from diverse foods and health risk was evaluated.PCDD/Fs w...The status of PCDDs and PCDFs content in retail foods from a certain area by Isotope Dilution HRGC-HRMS was surveyed and the local population PCDD/Fs exposure from diverse foods and health risk was evaluated.PCDD/Fs was extracted from samples by Soxhlet extraction,concentrated and purified by FMS column chromatograph,carbon column enrichment.Confirmation and quantitative analysis at pg/g level of PCDD/Fs was performed by HRGC/HRMS using multiple ion detection mode(MID).TEQ concentration was calculated by WHO-TEF multiplying by concentration of seventeen PCDD/Fs congener.Median of PCDD/Fs concentration for fish,livestock,poultry,egg,vegetable oil,milk,vegetable totally 100 samples for ten diverse foods didn’t exceed the limit standards by EU.The level of PCDD/Fs for different food in the certain area was lower or comparable to the data reported by developed country in the world.The total weekly intake and monthly intake for local population or national population was 3.44,14.8 WHO-TEQ/kg BW and 1.5,6.42 pg WHO-TEQ/kg BW respectively,the value was lower than the Tolerable Weekly Intake of 14 pg WHO TEQ/kg BW for PCDDs,PCDFs and dioxin-like PCBs established by EU Scientific Committee for Food.The dietary PCDD/Fs intake for local people was higher than national population.And animal food was the dominant contributor to the total dietary intake,which accounted for more than 70 percent.These levels of consumption of diverse food containing typical levels of PCDD/Fs doesn’t present a risk to the health of the local population.But integrative dietary intake could be evaluated including of PCBs intake for population in the future.展开更多
Chinese dwarf cherry(Ouli)is a native shrub in northwest China with high ecological value,but the nutritive potential remains to be explored.In this study,the total content of polyphenols,flavonoids,proanthocyanidins,...Chinese dwarf cherry(Ouli)is a native shrub in northwest China with high ecological value,but the nutritive potential remains to be explored.In this study,the total content of polyphenols,flavonoids,proanthocyanidins,and anthocyanins of Ouli from 30 germplasms were measured,and the antioxidant activities were evaluated by FRAP and ABTS assays.The polyphenol profile was determined by ultra-high-performance liquid chromatography-high resolution mass spectrometry.Grey relational analysis and partial least squares were utilized to build chemometrics models for selecting antioxidant compounds.The contents of total flavonoids,proanthocyanidins,phenols and total anthocyanidins of 30 germplasms of Ouli were 119.92-668.76 mg/100 g fresh weight(FW),90.81-555.44 mg/100 g FW,148.42-390.43 mg/100 g FW,0.02-17.26 mg/100 g FW,respectively.A total of 61 compounds were identified,including 40 flavonoids(26 flavonols,4 anthocyanins,6 dihydroflavonols,2 dihydrochalcones,and 2 flavones),12 proanthocyanidins,6 phenolic acids,and 3 types of other class compounds(one stilbene and two phenols).The proanthocyanidin compounds in Ouli contributes most to the total antioxidant capacity with the antioxidant rank that procyanidin trimer>tetramer>dimer≈monomer.Catechin and procyanidin B1 were the most abundant compounds and were 18.45-162.50μg/g FW and 30.52-149.42μg/g FW,respectively.Shanxi(SX)2 and SX10 could be considered as potential germplasms,and proanthocyanidins could be chosen as a characteristic nutrient evaluation index of Ouli.This study not only takes a key step to lay the groundwork for further research of Ouli but also provides a reference for the discovery of the functional ingredients of other foods.展开更多
文摘The status of PCDDs and PCDFs content in retail foods from a certain area by Isotope Dilution HRGC-HRMS was surveyed and the local population PCDD/Fs exposure from diverse foods and health risk was evaluated.PCDD/Fs was extracted from samples by Soxhlet extraction,concentrated and purified by FMS column chromatograph,carbon column enrichment.Confirmation and quantitative analysis at pg/g level of PCDD/Fs was performed by HRGC/HRMS using multiple ion detection mode(MID).TEQ concentration was calculated by WHO-TEF multiplying by concentration of seventeen PCDD/Fs congener.Median of PCDD/Fs concentration for fish,livestock,poultry,egg,vegetable oil,milk,vegetable totally 100 samples for ten diverse foods didn’t exceed the limit standards by EU.The level of PCDD/Fs for different food in the certain area was lower or comparable to the data reported by developed country in the world.The total weekly intake and monthly intake for local population or national population was 3.44,14.8 WHO-TEQ/kg BW and 1.5,6.42 pg WHO-TEQ/kg BW respectively,the value was lower than the Tolerable Weekly Intake of 14 pg WHO TEQ/kg BW for PCDDs,PCDFs and dioxin-like PCBs established by EU Scientific Committee for Food.The dietary PCDD/Fs intake for local people was higher than national population.And animal food was the dominant contributor to the total dietary intake,which accounted for more than 70 percent.These levels of consumption of diverse food containing typical levels of PCDD/Fs doesn’t present a risk to the health of the local population.But integrative dietary intake could be evaluated including of PCBs intake for population in the future.
基金supported by the Beijing Natural Science Foundation[grant number 5212014]Key Research and Development Program in the Ningxia Hui Autonomous Region,PR China[grant number 2020BBF02027].
文摘Chinese dwarf cherry(Ouli)is a native shrub in northwest China with high ecological value,but the nutritive potential remains to be explored.In this study,the total content of polyphenols,flavonoids,proanthocyanidins,and anthocyanins of Ouli from 30 germplasms were measured,and the antioxidant activities were evaluated by FRAP and ABTS assays.The polyphenol profile was determined by ultra-high-performance liquid chromatography-high resolution mass spectrometry.Grey relational analysis and partial least squares were utilized to build chemometrics models for selecting antioxidant compounds.The contents of total flavonoids,proanthocyanidins,phenols and total anthocyanidins of 30 germplasms of Ouli were 119.92-668.76 mg/100 g fresh weight(FW),90.81-555.44 mg/100 g FW,148.42-390.43 mg/100 g FW,0.02-17.26 mg/100 g FW,respectively.A total of 61 compounds were identified,including 40 flavonoids(26 flavonols,4 anthocyanins,6 dihydroflavonols,2 dihydrochalcones,and 2 flavones),12 proanthocyanidins,6 phenolic acids,and 3 types of other class compounds(one stilbene and two phenols).The proanthocyanidin compounds in Ouli contributes most to the total antioxidant capacity with the antioxidant rank that procyanidin trimer>tetramer>dimer≈monomer.Catechin and procyanidin B1 were the most abundant compounds and were 18.45-162.50μg/g FW and 30.52-149.42μg/g FW,respectively.Shanxi(SX)2 and SX10 could be considered as potential germplasms,and proanthocyanidins could be chosen as a characteristic nutrient evaluation index of Ouli.This study not only takes a key step to lay the groundwork for further research of Ouli but also provides a reference for the discovery of the functional ingredients of other foods.
