Volatile compounds of a pumpkin (Cucurbita moschata) puree processed by high pressure thermal processing

Abstract

BACKGROUND The changes in the volatile profile of a pumpkin (Cucurbita moschata, Duch.) puree processed by high pressure thermal (HPT) processing at different pressure and initial temperature intensities (300, 600, 900 MPa and 60, 80 degrees C, respectively) was evaluated. Headspace solid-phase microextraction (HS-SPME) technique was used for the extraction and concentration of volatile compounds and the analysis was performed by gas chromatography-mass spectrometry (GC-MS). RESULTS Alcohols were the volatile compounds most abundantly isolated in the headspace of pumpkin puree (control and processed purees had ranges between 43 and 56%), followed by aldehydes (14-28%), hydrocarbons (8-13%) and terpenes (7-10%). Lipid oxidation, Maillard reaction and carotenoids degradation were the main chemical routes of formation of volatile compounds after HPT processing. Initial temperature or pressure intensity of HPT processing, within the ranges tested in this study, did not affect the initial levels of volatile compounds of pumpkin puree. CONCLUSION HPT processing is an effective technology for the preservation of the original aroma of low acid vegetables such as pumpkin. (c) 2020 Society of Chemical Industry