Showing papers by "Mitsuo Namiki published in 1974"
21 citations
TL;DR: A new phthalide was isolated as a metabolite of Alternaria kikuchiana and identified as 3-carboxymethyl-7-hydroxyphthalide (1a).
Abstract: A new phthalide was isolated as a metabolite of Alternaria kikuchiana and identified as 3-carboxymethyl-7-hydroxyphthalide (1a).
13 citations
TL;DR: Dehydroaltenusin, a metabolite of Alternaria kikuchiana, was coverted from altenus in with homogenated potato and sweet potato extracts.
Abstract: Dehydroaltenusin, a metabolite of Alternaria kikuchiana, was coverted from altenusin with homogenated potato and sweet potato extracts.
8 citations
TL;DR: In this paper, a short time heating of the reaction mixture of dehydroascorbic acid and amino acid was found to give a fairly stable free radical product(s) which could be isolated on tic as a blue fraction and showed the hyperfine esr spectra.
Abstract: A short time heating of the reaction mixture of dehydroascorbic acid and amino acid was found to give a fairly stable free radical product(s) which could be isolated on tic as a blue fraction and showed the hyperfine esr spectra.
6 citations
TL;DR: In this paper, a new radical product of multiplet signal was isolated from tic of the reaction mixture of dehydroasco, in addition to the radical products of a triplet esr signal and a quintet doublet signal.
Abstract: In addition to the radical products of a triplet esr signal (R-A) and a quintet-doublet (R-B), a new radical product of multiplet signal was isolated from tic of the reaction mixture of dehydroasco...
6 citations
TL;DR: Onion bulbs of unirradiated and irradiated with 4.2 and 8.1 Krad by 60Co gamma rays were stored at 4° and 10°C for five months, and the relationship between the sprouting and the amounts of di-n-propyl disulfide (DPDS) developed from the sliced onions was investigated.
Abstract: Onion bulbs of unirradiated and irradiated with 4.2 and 8.1 Krad by 60Co gamma rays were stored at 4° and 10°C for five months, and the relationship between the sprouting and the amounts of di-n-propyl disulfide (DPDS) developed from the sliced onions was investigated. The amount of DPDS increased apparently along with the sprouting. The sprout inhibition with the irradiation was appeared to suppress the development of DPDS.
2 citations
TL;DR: In this article, the radiolysis mechanism of p-bromophenol was elucidated by gas chromatography and polarography, and it was shown that hydrated electrons contribute principally to debromination and then phenylation of the resulting p-hydroxyphenyl radical.
Abstract: In order to elucidate the radiolysis mechanism of p-bromophenol, quantitative determination of the radiolysis products was carried out by gas chromatography and polarography. G(−p · BP) and G(Br−) were 3.86 and 2.58 at neutral pH, and 1.09 and 0.26 at pH 1.0, respectively, This, together with the radical scavenger effects indicated that hydrated electrons contribute principally to the degradation of p-bromophenol through debromination, followed by the formation of dimer and trimer products by phenylation of the resulting p-hydroxyphenyl radical. This chain-like reaction may cause the difference (G-value = 1.28) between G(−p· BP) and G(Br−). The contribution of OH radicals to G(−p· BP) is known to be small as compared with other aromatic compounds, because of the poor yield of hydroxylated products such as hydroquinone, 4-bromocatechol and 4-bromoresorcinol.
2 citations
TL;DR: The results indicate that the reaction is due principally to hydrated electrons, which was demonstrated by the reaction of thymine glycol with chemically-produced electrons.
Abstract: SummaryTo elucidate the mechanism of the reverse reaction from thymine glycol to thymine in aqueous solution by γ-irradiation, the effects of oxygen, pH and various scavengers were studied. These results indicate that the reaction is due principally to hydrated electrons. This was also demonstrated by the reaction of thymine glycol with chemically-produced electrons. The rate constant of the reaction with hydrated electrons was estimated by the competition method. E.s.r. studies in ethylene glycol glass suggested the presence of the anion intermediate. A reaction mechanism involving disproportionate processes in thymine formation is proposed.
2 citations