Department of Analytical Chemistry and Physical Chemistry, Federal University of Ceará, R. Humberto Monte S/N, Pici, CEP: 60455-700, Fortaleza, Ceará, Brazil.
Industrial Technology Center of Ceará Foundation (Fundação Núcleo de Tecnologia Industrial do Ceará - NUTEC), Rua Rômulo Proença S/N, Campus do Pici, CEP: 60451-970, Fortaleza, CE, Brazil.
Food Chem. 2016 May 15;199:380-6. doi: 10.1016/j.foodchem.2015.12.007. Epub 2015 Dec 5.
"Quick, Easy, Cheap, Effective, Rugged and Safe" (QuEChERS)-GC/MS analytical technique was used to evaluated matrix effect of twenty-two pesticides in guava. Validation parameters (selectivity, linearity, LOD, LOQ, accuracy and precision) were determined for multiresidue analysis. Statistical test (t-student) was applied to the coefficients of the curves obtained for the guava matrix. The matrix effect (ME) for each pesticide was evaluated through the study of slope ratios obtained of solvent and guava matrix curves. Most of the compounds had positive ME. The rates of recovery were satisfactory (73.97-119.38%), with a coefficient of variation (CV) less than 20%. Analysis of commercial guava samples showed the presence of 5 types of pesticides residues at levels ranging from 0.1 to 0.5 mg·kg(-1). The results reveal the presence of unauthorized pesticides for cultivation of guava. This data can assist government agencies to ensure food security.
"快速、简便、廉价、有效、耐用和安全"（QuEChERS）-GC/MS 分析技术被用于评估番石榴中 22 种农药的基质效应。对多残留分析进行了验证参数（选择性、线性、LOD、LOQ、准确度和精密度）的测定。统计检验（t 检验）应用于获得的番石榴基质曲线的系数。通过研究溶剂和番石榴基质曲线的斜率比来评估每种农药的基质效应（ME）。大多数化合物具有正 ME。回收率令人满意（73.97-119.38%），变异系数（CV）小于 20%。对商业番石榴样品的分析表明，存在 5 种农药残留，含量在 0.1 至 0.5mg·kg（-1）之间。结果表明番石榴种植中存在未经授权的农药。这些数据可以帮助政府机构确保食品安全。
