Effect of Grinding Methods, Heating Methods, and
Variety on 2-Pentylfuran in Soymilk. 2-Pentylfuran is a
very unique odor compound. It has a beany odor note as
reported by Belitz et al.As shown
in Table 1, in contrast to other odor compounds, it increased
with heating. According to Bradley and Min,singlet oxygen
could be formed by riboflavin present in soymilk, and 2-
pentylfuran was generated by singlet oxygen action on linoleic
acid via a specific oxidation mechanism.also
found only soy flour stored under light could generate 2-
pentylfuran. Bradley and Min mainly contributed it to the
formation of singlet oxygen induced by chlorophyll, which can
promote the reaction in a similar manner as riboflavin.
In most cases, ambient grinding resulted in significantly (p <
0.05) higher 2-pentylfuran as compared with the other two
grinding methods, between which hot grinding caused much
lower 2-pentylfuran formation than cold grinding. These values
suggest that heat inactivation of lipoxygenases could partly
restrict the generation of 2-pentylfuran to some extent. Soymilk
from traditional stove cooking contained several times higher 2-
pentylfuran than that from the UHT methods. In stove
cooking, continuous stirring and longtime exposure to light and
air could lead to the extensive formation of singlet oxygen.
Among our processing methods, the hot grinding and the UHT
processing were particularly effective in reducing 2-pentylfuran
to that below sensory threshold values