title: Antioxidative activity of animal and vegetable dietary fibers.
abstract: Some dietary fibers originated from insects such as silkworm (Sericin) and others along with constituents of several representative seaweeds such as wakame Undaria pinnatifida; hijiki Hizikia fusifome; and kombu Laminaria japonica, were found to have fairly large reaction rates determined by quenching experiments of emission spectra in the near-infrared region lambdamax 1270 nm for singlet oxygen 1O2, Cypridina luminescence method for superoxide, and peroxide value (POV) for autoxidation. The determined reaction rates are between 10(3)-10(5) (g/L)(-1) s(-1) for the insect and the plant dietary fibers; the larger ones are as large as that of ascorbic acid, 1.93 x 10(4) (g/L)(-1) s(-1) for singlet oxygen. Most of these seaweed constituents also showed antioxidative activity against autoxidation and superoxide as well as their immunological enhancing activity. These results suggest a possibility that dietary fibers that are supposed to prevent the large-intestine cancer by their physical properties may prevent the cancer, at least in parts, by their chemical, antioxidative activity.
authors.affiliation: Graduate School of Biosphere Science, Hiroshima University, Higashi-Hiroshima 739-8528, Japan. suzukin@hiroshima-u.ac.jp
authors.forename: Nobutaka
authors.initials: N
authors.lastname: Suzuki
authors.forename: Ayako
authors.initials: A
authors.lastname: Fujimura
authors.forename: Takeshi
authors.initials: T
authors.lastname: Nagai
authors.forename: Iwao
authors.initials: I
authors.lastname: Mizumoto
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Itami
authors.forename: Hideo
authors.initials: H
authors.lastname: Hatate
authors.forename: Takashi
authors.initials: T
authors.lastname: Nozawa
authors.forename: Norihisa
authors.initials: N
authors.lastname: Kato
authors.forename: Tateo
authors.initials: T
authors.lastname: Nomoto
authors.forename: Binkoh
authors.initials: B
authors.lastname: Yoda
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000302:isolation & purification*; D012831:Bombyx; D004043:Dietary Fiber / Q000032:analysis*; D007700:Kinetics; D010047:Ovalbumin / Q000737:chemistry; D047030:Sericins / Q000032:analysis; D026082:Singlet Oxygen / Q000032:analysis; D013481:Superoxides / Q000032:analysis; D014675:Vegetables / Q000737:chemistry*
chemical_list: D000975:Antioxidants; D004043:Dietary Fiber; D047030:Sericins; D013481:Superoxides; D026082:Singlet Oxygen; D010047:Ovalbumin