The amounts of hydrogen peroxide contained in agricultural, stockbreeding and aquatic products and their processed foods.

Tsuji, Sumiko; Nakamura, Yumiko; Tonogai, Yasuhide; Shibata, Tadashi; Uchibori, Nobutake; Kawata, Makoto; Kobayashi, Tateo; Suzuki, Hiroshi; Muroi, Junko; Suzuki, Yukiko; Kaneta, Noboru; Suzuki, E.; Miyamoto, Fumio; Ito, Yoshio

doi:10.3136/nskkk1962.37.111

Cited by 11 publications

(3 citation statements)

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“…The determined sequence was “MNENEKKLTTNQGVPIXDNQ”. This sequence is identical to that of the previously reported EktA except for the undetermined 17th residue [30]. Therefore, it is considered that there is no modification or cutting of the N-terminal sequence of the extracellular catalase in comparison with that of the intracellular catalase.…”

Section: Resultssupporting

confidence: 72%

“…The prepared cell suspension was reacted with 25–80 mM H 2 O 2 and an aliquot of the sample was obtained from the reaction mixture in a time-dependent manner. The H 2 O 2 concentration in the obtained reaction mixture was determined on the basis of previous reports [30], [31] as follows: 0.4 ml of the sample solution was added to 0.4 ml of 5% Ti(SO 4 ) 2 , and its absorbance at 408 nm was determined.…”

Section: Methodsmentioning

confidence: 99%

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Growth-Dependent Catalase Localization in Exiguobacterium oxidotolerans T-2-2T Reflected by Catalase Activity of Cells

et al. 2013

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A psychrotolerant and H2O2-resistant bacterium, Exiguobacterium oxidotolerans T-2-2T, exhibits extraordinary H2O2 resistance and produces catalase not only intracellularly but also extracellularly. The intracellular and extracellular catalases exhibited the same enzymatic characteristics, that is, they exhibited the temperature-dependent activity characteristic of a cold-adapted enzyme, their heat stabilities were similar to those of mesophilic enzymes and very high catalytic intensity. In addition, catalase gene analysis indicated that the bacterium possessed the sole clade 1 catalase gene corresponding to intracellular catalase. Hence, intracellular catalase is secreted into the extracellular space. In addition to intracellular and extracellular catalases, the inner circumference of the cells showed the localization of catalase in the mid-stationary growth phase, which was observed by immunoelectron microscopy using an antibody against the intracellular catalase of the strain. The cells demonstrated higher catalase activity in the mid-stationary growth phase than in the exponential growth phase. The catalase localized in the inner circumference can be dissociated by treatment with Tween 60. Thus, the localized catalase is not tightly bound to the inner circumference of the cells and may play a role in the oxidative defense of the cells under low metabolic state.

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Section: Resultssupporting

confidence: 72%

Section: Methodsmentioning

confidence: 99%

Growth-Dependent Catalase Localization in Exiguobacterium oxidotolerans T-2-2T Reflected by Catalase Activity of Cells

et al. 2013

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“…These results suggest that POX in saliva can use not only SCN Ϫ but also quercetin as a substrate to scavenge H 2 O 2 , and that the H 2 O 2 -scavenging function of the POX/quercetin system becomes more important as the concentration of H 2 O 2 is increased from 2 to 50 M. According to a paper by Thomas and Pera (1983), local concentrations of H 2 O 2 in the oral cavity can be increased to 50-500 M when H 2 O 2 is generated by Streptococcus mutans. Concentrations of H 2 O 2 in saliva may also be increased during the chewing of foods, because foodstuffs sometimes contain high concentrations of H 2 O 2 (Tsuji et al, 1990). Leukocytes of saliva may also participate in the formation of H 2 O 2 (Yamamoto et al, 1991).…”

Section: Resultsmentioning

confidence: 99%

Quercetin Glucosides are Hydrolyzed to Quercetin in Human Oral Cavity to Participate in Peroxidase-Dependent Scavenging of Hydrogen Peroxide.

Hirota

Nishioka

Shimoda

et al. 2001

FSTR

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It has been reported that consuming food which contains flavonols is related to the decrease in risks to arteriosclerosis and cancer. One objective of this study was to elucidate the metabolism of quercetin and the glucosides (quercetin 3,4¢-diglucoside and quercetin 4¢-glucoside) present in onion soup, in the oral cavity. Not only quercetin glucosides but also quercetin were found in whole saliva which was collected 15 min after eating onion soup. Quercetin seemed to be formed by deglucosidation of the glucosides. The concentrations of the flavonols were much higher in sediments than in supernatants of the saliva suggesting that the flavonols bound to components of the sediments like detached epithelial cells. Concentrations of quercetin and the glucosides in the oral cavity decreased as a function of time after the intake. The decreases were mainly due to the washing away from this cavity by saliva. In addition, deglucosidation of quercetin glucosides to quercetin was also assumed to contribute to the decrease in the glucosides and oxidation of quercetin by peroxidase (POX) in saliva to the decrease in quercetin. Based on the data that quercetin was oxidized by POX in saliva in the presence and absence of thiocyanate, it is suggested that quercetin as well as thiocyanate can be a substrate for POX in saliva to scavenge H 2 O 2 in oral cavity. Keywords: H 2 O 2-scavenging, metabolism of quercetin and the glucoside, onion (Allium cepa), oral cavity, peroxidase in saliva

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Salivary thiocyanate/nitrite inhibits hydroxylation of 2-hydroxybenzoic acid induced by hydrogen peroxide/Fe(II) systems under acidic conditions: possibility of thiocyanate/nitrite-dependent scavenging of hydroxyl radical in the stomach

Takahama

Oniki

2004

Biochimica et Biophysica Acta (BBA) - General Subjects

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The amounts of hydrogen peroxide contained in agricultural, stockbreeding and aquatic products and their processed foods.

Cited by 11 publications

References 0 publications

Growth-Dependent Catalase Localization in Exiguobacterium oxidotolerans T-2-2T Reflected by Catalase Activity of Cells

Growth-Dependent Catalase Localization in Exiguobacterium oxidotolerans T-2-2T Reflected by Catalase Activity of Cells

Quercetin Glucosides are Hydrolyzed to Quercetin in Human Oral Cavity to Participate in Peroxidase-Dependent Scavenging of Hydrogen Peroxide.

Salivary thiocyanate/nitrite inhibits hydroxylation of 2-hydroxybenzoic acid induced by hydrogen peroxide/Fe(II) systems under acidic conditions: possibility of thiocyanate/nitrite-dependent scavenging of hydroxyl radical in the stomach

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