Abstract
To evaluate the effect of separate analyses and the variation of residues in the different fruit portions, the residue levels of six kinds of pesticides in apples, Japanese pears and pears were determined. Both factors were estimated to compare the residue levels in the two types of size-reduced samples. For one of the size-reduced samples, pesticide residues were directly analyzed when fresh (A). For another sample, residues in both edible (B) and inedible (C) portions were separately analyzed, and then pesticide residue levels were calculated on a whole commodity basis (D). The pesticide residue levels in the inedible portions were equal to or higher than those in the edible portions (C/B: 1.57–2.38). There was no statistical significant difference in the other three residue datasets of the fresh, edible and calculated whole samples (A/B: 1.07–1.24 and A/D: 0.93–1.07). We did not observe the effects of the sample size reduction process or the separate portion analysis.
