This study was aimed to determine the contents and the association of B vitamins from seeds of 10 black
and one yellow soybean (Glycine max (L.) Merr.) varieties with either green or yellow cotyledon.
Thiamine, flavin adenine dinucleotide (FAD), riboflavin and total riboflavin were found highest in
‘Chengjakong’, while flavin mononucleotide (FMN) was greatest in ‘Mirang’. Nicotinic acid and total vitamin
B3 were highest in ‘Shingi’ as a yellow soybean variety but pantothenic acid and pyridoxine contents
were greatest in ‘Tawon’ and ‘Mirang’, respectively. These content variations of B vitamins directly
reflected the wide segregation of soybean varieties on the principal component analysis (PCA) scores plot,
indicating that these 4 soybean varieties appeared to be least associated with other soybean varieties
based on the different responses of B vitamins. The results of cluster and correlation analyses presented
that the cotyledon colour of soybean seed contributed to a variation of B vitamin contents. Overall, the
results suggest that a wide range of B vitamin contents would be affected by genotypic factors alongside
the difference of cotyledon colour