Abstract
Solid Phase Microextraction-Gas Chromatography Triple Quadrupole Mass Spectrometry (SPME-GC-TQ/MS) was optimized and validated to specifically analyze aldehydes and furans after drying Vitis vinifera grape variety by conventional as well as modern pre-drying technique i.e. pulsed electric field (PEF). Analytical method was validated in terms of linearity (R (2)), recovery (%), relative standard deviation (% RSD), limit of detection (LOD) and limit of quantification (LOQ). Sample pre-treatment with PEF (1 kV/cm) followed by drying at 65°C produced dried product with fewer chemical changes in the composition than convective hot air drying. Meanwhile, nutritional parameters including polyphenolics, amino acids, fatty acids and sugars profiles were also extensively investigated to get deeper insights into the effect of drying treatments on the nutritional quality of dried product. Conclusively, sample pre-treatment on relatively lower PEF voltage, followed by drying at minimum temperature with longer time duration can preserve nutritional quality of product by forming less harmful compounds.