Investigation of changes in non-traditional indices of maturation in Navel orange peel and juice using GC-MS and LC-QTOF/MS.

Abstract Changes in non-traditional indices of maturity, such as flavonoids and volatile compounds, during maturation were studied in Navel orange. Navel oranges were obtained at four stages of maturation, and non-volatile and volatile compounds in the peel and juice were analysed using liquid chromatography coupled with a quadrupole time-of-flight detector (LC-QTOF/MS) and gas chromatography with mass spectrometry and a flame ionisation detector (GC–MS/FID), respectively. Twenty-eight non-volatile and 62 volatile compounds in the peel as well as 22 non-volatile and 11 volatile compounds in the juice were found to have significant changes (p