Radical scavenging activity of a purple pigment, hordeumin, from uncooked barley bran-fermented broth.
A novel purple pigment called hordeumin, a type of anthocyanin-tannin pigment, was produced from barley bran-fermented broth. The radical scavenging activity of hordeumin was analyzed by using an electron-spin resonance (ESR) spectrometer. The hordeumin scavenged superoxide radical in a concentration-dependent manner. Superoxide dismutase-like activity values were 118 and 195 units/mg for crude and partially purified hordeumin, respectively. The two types of hordeumins also scavenged the DPPH radical. Furthermore, barley bran-fermented filtrate before pigment formation and extract of barley bran also scavenged the DPPH radical. However, the DPPH radical scavenging activity of a filtrate, fermented over a long period, was stronger than that fermented over a short period. Thus, it was considered that radical scavenging activity of hordeumin resulted from barley bran polyphenol such as proanthocyanidins.
Deguchi
T
T
Department of Applied Microbial Technology, Faculty of Engineering, Kumamoto Institute of Technology, Ikeda, Japan.
Ohba
R
R
Ueda
S
S
D000872:Anthocyanins / Q000302:isolation & purification / Q000494:pharmacology*; D005285:Fermentation; D016166:Free Radical Scavengers / Q000302:isolation & purification / Q000494:pharmacology*; D001467:Hordeum / Q000737:chemistry*; D047348:Hydrolyzable Tannins; D013634:Tannins / Q000302:isolation & purification / Q000494:pharmacology*
D000872:Anthocyanins; D016166:Free Radical Scavengers; D047348:Hydrolyzable Tannins; D013634:Tannins; C408380:hordeumin