KMID : 1134820150440040540
|
|
Journal of the Korean Society of Food Science and Nutrition 2015 Volume.44 No. 4 p.540 ~ p.548
|
|
Physicochemical Characteristics and Biological Activities of Rice and Amaranth Fermented by Bacillus subtilis KMKW4
|
|
Yang Su-Jin
Lee Rea-Hyun Hong Joo-Heon
|
|
Abstract
|
|
|
This study examined the cultural characteristics and biological activities of fermented rice and amaranth with Bacillus subtilis KMKW4. These samples were made with various amounts of rice and amaranth [100:0 (R100), 90:10 (R90), 80:20 (R80), and 70:30 (R70)]. B. subtilis KMKW4 was used as starter for the fermentation, and its cultures at the lated logarithmic growth were inoculated for final concentration of 2% (v/v). Number of viable cells of fermented R80 (7.67 log CFU/mL) was greater than those of R100, R90, and R70 (7.48 log CFU/mL, 7.38 log CFU/mL, and 7.09 CFU/mL, respectively) during the fermentation period (120 h). Amylase activities of fermented R80 and R100 were 57.77 U/mL and 19.91 U/mL, respectively. Furthermore, amylase activities of fermented freeze-dried powders of R100 and R80 were 24.31 U/g and 9.12 U/g, respectively. Free sugar contents of R100 and R80 increased after fermentation, and that of R80 (5,454.15 mg/100 g) significantly increased compared to that of R100 (4,274.85 mg/100 g). The free amino acid content of R80 was higher than that of R100. DPPH and superoxide radical scavenging activities of 5 mg/mL of fermented freeze-dried powder (R80) were 44.21% and 89.76%, respectively. ACE inhibition rates and ¥á-glucosidase inhibitory activities were significantly higher in R80 than R100. This study suggested that fermentation of R80 might be a new potential source of antioxidant, anti-diabetic, and anti-hypertensive agents applicable to grain enzyme-containing foods.
|
|
KEYWORD
|
|
Bacillus subtilis KMKW4, rice, amaranth, amylase activity, ¥á-glucosidase inhibitory activity
|
|
FullTexts / Linksout information
|
|
|
|
Listed journal information
|
|
|
|