“…Volatile compounds are synthesized from fatt y acid metabolism, amino acid metabolism, and carbohydrate metabolism (5,63,64), through the following pathways (40): (i) straight-chain aldehydes, alcohols and esters are synthesized from lipids, mainly linolenic and linoleic acids, through β-oxidation and lipoxygenase activity (8,16), (ii) branched-chain aldehydes, alcohols and esters are derived from isoleucine (17,(65)(66)(67), (iii) terpenoids are synthesized via the mevalonate pathway (63,68) and deoxyxylulose phosphate pathway (69), and (iv) phenylpropanoids are synthesized from the phenylpropanoid pathway (70).…”