Impact of thermal processing methods on the composition and content of 4'-O-methylpyridoxine analogues in Ginkgo biloba seeds

This study investigated the effect of thermal processing methods, namely, boiling, microwaving, baking, and frying, on the 4'-O-methylpyridoxine (MPN) analogues of Gingko biloba seeds. All thermal processing methods decreased MPN, pyridoxine, and pyridoxal-5'-phosphate, total MPN (TMPN), and total vitamin B6 (VB6) contents but increased MPN-5'-glucoside and pyridoxamine contents. Baking and frying reduced TMPN content by 46.54%–54.67% and 46.54%–54.67%, respectively. Frying was identified as the optimal thermal processing method that maintains the VB6 compound content of G. biloba seeds at high levels (72.92%–84.62%). Principal component analysis revealed the different effects of thermal processing methods on MPN analogues in G. biloba seeds. The results of this study demonstrate that compared with other thermal processing methods, frying can better reduce the toxic compound content (TMPN) of G. biloba seeds and promote VB6 retention.