We measured the concentrations of organophosphorus pesticide chlorpyrifos-methyl, pirimiphos-methyl and fenitrothion residues in domestic and imported commercial wheat products flour, noodles, cookies collected from 2008 to 2016. Chlorpyrifos-methyl and fenitrothion in domestic flour samples were detected in 16 out of 34 samples at levels of 0.001 to 0.016 ppm, and in 14 out of 34 samples at levels of 0.001 to 0.004 ppm. Chlorpyrifos-methyl was detected in 22 out of 38 domestic cookies at levels of 0.001 to 0.054 ppm median: 0.001 ppm . Relatively high concentrations of chlorpyrifos-methyl 0.005 to 0.054 ppm were found in six domestic cookies containing wheat bran. Pirimiphos-methyl was detected in 32 out of 68 cookies from foreign countries at levels of 0.001 to 0.11 ppm. Pirimiphos-methyl was detected frequently in products imported from Europe.
S-421 is a synergist of pyrethroid and organophosphorus pesticides, which are used as termiticides or household insecticides. S-421 is stable and ubiquitous in the environment. Here we describe the concentrations of S-421 in domestic and imported commercial fish collected from 2009 to 2016. Samples were extracted with acetone/hexane and S-421 was purified on a silica gel column. Quantitative analysis was performed by GC-ECD. S-421 was detected in 78 of 116 samples of domestic fish and shellfish at levels of <0.2 to 2.6 ng/g (mean: 0.4 ng/g), and in 69 of 102 imported samples at a level of <0.2 to 1.5 ng/g (mean: 0.4 ng/g). The concentrations of S-421 in fish were lower than those of p,p'-DDE and similar to those of β-HCH.
Ana t t e mp t t ome a s u r ea c e t y l c h o l i n e s t e r a s ei n h i b i t o r ya c t i v i t yo f o r g a n o p h o s p h o r u sf l a mer e t a r d a n t sa n da c e t o n ee x t r a c t f r o m h o u s ed u s t Mi k a k oNOGUC HI 1 ) , Ak i MI Z US HI MA 1 ) , Yo k oYAMADA( NAKAS HI MA) 1 ) , S h o k oF UKUDA 2 ) a n dS e i s a k uYOS HI DA 2 ) * 1 ) F o o dS c i e n c ea n dNu t r i t i o nMa j o r , Gr a d u a t eS c h o o l o f Hu ma nE n v i r o n me n t a l S c i e n c e s , Mu k o g a waWo me n ' sUn i v e r s i t y , 6 -4 6 , I k e b i r a k i -c h o , Ni s h i n o mi y a6 6 3 -8 5 5 8 , J a p a n 2 ) De p a r t me n t o f F o o dS c i e n c ea n dNu t r i t i o n , F a c u l t yo f Hu ma nE n v i r o n me n t a l S c i e n c e s , Mu k o g a waWo me n ' sUn i v e r s i t y , 6 -4 6 , I k e b i r a k i -c h o , Ni s h i n o mi y a6 6 3 -8 5 5 8 , J a p a n Ke ywo r d s :ハウスダスト( h o u s ed u s t ) ,有機リン系難燃剤( o r g a n o p h o s p h o r u sf l a mer e t a r d a n t ) , アセチルコリンエステラーゼ( a c e t y l c h o l i n e s t e r a s e ) ,阻害( i n h i b i t i o n )
I n s e c t i c i d el e v e l si nh o u s ed u s t c o l l e c t e da r o u n dOs a k af r o m 2 0 1 1t o2 0 1 5 Mi k a k oNOGUC HI 1) , Mi s a k i WAT ANAB E 1) , S h o k oF UKUDA 2) a n dS e i s a k uYOS HI DA 2) * 1)
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