Comparison of Sample Pretreatment and Analytical Method for Nitrate Determination in Vegetables

Different sample pretreatment extraction techniques and analytical methods are often used for nitrate determination in vegetables; however, the effects of these variables have not been properly examined. Therefore, (oven-dried fresh extraction) (colorimetric method (salicylic (SM)) high-performance liquid chromatography (HPLC) were compared Chinese kale (K) morning glory (M) this study. Oven-dried samples (K M) extracted by maceration determined content SM. As a result, contents both oven-dried significantly lower than (p < 0.01). A high correlation between SM HPLC was observed 21 K M. The using Both could be analysis vegetables with an awareness impurities HIGHLIGHTS drying process reduced Temperature demonstrated all dried vegetable Colorimetric Salicylic acid GRAPHICAL ABSTRACT