PMID- 31576192
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20201001
IS  - 1348-589X (Print)
IS  - 1349-0923 (Electronic)
IS  - 1348-589X (Linking)
VI  - 44
IP  - 3
DP  - 2019 Aug 20
TI  - Influences of sample homogenization time and standing time before extraction on 
      the determination of incurred pesticide residue levels in grapes.
PG  - 162-170
LID - 10.1584/jpestics.D19-026 [doi]
AB  - To estimate the influence of sample processing with a blender, we conducted a 
      homogeneity test using a bulk sample of pre-harvest grapes. Relative standard 
      deviations (RSDs) were calculated from the concentrations of pesticides in the 
      portions from the top, middle, and bottom of the homogenate with fine and rough 
      particles. The results from adequate sample processing showed that the RSDs of 
      the residue levels of all five pesticides in the fine-particle homogenate were 
      lower than 10%. In contrast, the results under problematic conditions such as 
      short blending times and long standing times after blending showed higher RSDs 
      (>15%). The RSDs of nonpolar pesticides showed greater variabilities under the 
      problematic conditions than those of polar pesticides. Separate analyses of the 
      precipitate and supernatant phases suggested that the distribution bias of skin 
      particles in the homogenate has a major effect on the concentration of nonpolar 
      pesticides because of weighing errors in the extracted portions.
CI  - (c) 2019 Pesticide Science Society of Japan.
FAU - Hikino, Shinobu
AU  - Hikino S
AD  - The Institute of Environmental Toxicology (IET), 4321, Uchimoriya-machi, 
      Joso-shi, Ibaraki 303-0043, Japan.
FAU - Yajima, Tomonari
AU  - Yajima T
AD  - The Institute of Environmental Toxicology (IET), 4321, Uchimoriya-machi, 
      Joso-shi, Ibaraki 303-0043, Japan.
FAU - Sakasai, Michiko
AU  - Sakasai M
AD  - The Institute of Environmental Toxicology (IET), 4321, Uchimoriya-machi, 
      Joso-shi, Ibaraki 303-0043, Japan.
FAU - Kobayashi, Daisuke
AU  - Kobayashi D
AD  - The Institute of Environmental Toxicology (IET), 4321, Uchimoriya-machi, 
      Joso-shi, Ibaraki 303-0043, Japan.
FAU - Iijima, Kazuaki
AU  - Iijima K
AD  - The Institute of Environmental Toxicology (IET), 4321, Uchimoriya-machi, 
      Joso-shi, Ibaraki 303-0043, Japan.
FAU - Ohyama, Kazutoshi
AU  - Ohyama K
AD  - The Institute of Environmental Toxicology (IET), 4321, Uchimoriya-machi, 
      Joso-shi, Ibaraki 303-0043, Japan.
LA  - eng
PT  - Journal Article
PL  - Japan
TA  - J Pestic Sci
JT  - Journal of pesticide science
JID - 101580833
PMC - PMC6753257
OTO - NOTNLM
OT  - blender
OT  - grape
OT  - homogeneity
OT  - pesticide residue
OT  - sample processing
OT  - variability
EDAT- 2019/10/03 06:00
MHDA- 2019/10/03 06:01
PMCR- 2019/08/20
CRDT- 2019/10/03 06:00
PHST- 2019/10/03 06:00 [entrez]
PHST- 2019/10/03 06:00 [pubmed]
PHST- 2019/10/03 06:01 [medline]
PHST- 2019/08/20 00:00 [pmc-release]
AID - 10.1584/jpestics.D19-026 [doi]
PST - ppublish
SO  - J Pestic Sci. 2019 Aug 20;44(3):162-170. doi: 10.1584/jpestics.D19-026.