Rikisaku Suemitsu

Zinnimidine and 5-(3′,3′-dimethylallyloxy)-7-methoxy-6-methylphthalide from Alternaria porri

Abstract The structures of two metabolites, isolated from the culture liquid of Alternaria porri , have been identified as zinnimidine and 5-(3′,3′-dimethylallyloxy)-7-methoxy-6-methylphthalide. The latter is the first reported isolation as a naturally occurring product.

Alterporriol a a modified bianthraquinone from alternaria porri

Abstract The spent growth medium and mycelia of Alternaria porri afforded a novel anthraquinone named alterporriol C, whose structure was determined by spectroscopic methods as well as by degradation to known compounds. Alterporriol C was found to be an α,β′-bianthraquinone derived from macrosporin and altersolanol A.

Production of alterporriols, altersolanols and macrosporin by Alternaria porri and A. solani.

Abstract The production of alterporriols, altersolanols and macrosporin by Alternaria porri and A. solani was examined by means of HPLC. Alterporriol-A, -B and -C were detected from both species, using potato sucrose medium, and from A. porri , using onion decoction medium. They were not detected in either species, using Brians T medium. Altersolanol-A and -B and macrosporin were detected in both species on all three media tested.

Structure of Porriolide, a New Metabolite from Alternaria porri

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Biosynthesis of macrosporin by Alternaria porri

Abstract The biosynthesis of macrosporin, a metabolise of Alternaria porri, was elucidated by incorporation experiments of single and double labelled acetates. 13C NMR assignments were also established.

New synthesis of α-diketones from aldehydes and alkyl iodides using pentacarbonyliron

α-Diketones were prepared under mild conditions in high yields from aldehydes and alkyl iodides using pentacarbonyliron.

Isolation and Identification of 6-(3′,3′-Dimethylallyloxy)-4-methoxy-5-methylphthalide from Alternaria porri

Isolation and Identification of 6-(3′,3′Dimethylallyloxy)-4-methoxy-5-methylphthalide from Alternaria porri Rikisaku Suemitsu, Keiichiro Ohnishi, Masayuki Horiuchi & Yoshiyuki Morikawa To cite this article: Rikisaku Suemitsu, Keiichiro Ohnishi, Masayuki Horiuchi & Yoshiyuki Morikawa (1992) Isolation and Identification of 6-(3′,3′-Dimethylallyloxy)-4-methoxy-5methylphthalide from Alternaria porri, Bioscience, Biotechnology, and Biochemistry, 56:6, 986-986, DOI: 10.1271/bbb.56.986 To link to this article: http://dx.doi.org/10.1271/bbb.56.986

Biosyntheses of alterporriol D and E by Alternaria porri

Abstract The biosyntheses of alterporriol D and E, metabolites of Alternaria porri were elucidated by incorporation experiments of single and double labelled acetates. 13 C NMR assignments were also established.

Transesterification of Ethylparaben by Free and Entrapped Cells of Pseudomonas cepacia

Abstract Ethylparaben was transesterified to methylparaben in the presence of methanol by Pseudomonas cepacia . When the bacterium was incubated in water-methanol solutions of ethylparaben in the range of 0.01 to 2% methanol, the higher the content of methanol, the higher the conversion ratios of ethylparaben. If over 5% methanol was used, the bacterium could not survive and the reaction did not proceed. Transesterifications also proceeded with 1-propanol or benzyl alcohol instead of methanol, though the conversion ratios were low. Conversion ratios were found to be higher throughout the conversion period by entrapping the cells to Ca alginate or polyurethanes than for free cells. The results are presumably due to the higher stability of cells in 10% alcohol in which free cells could not survive. PU-3 and PU-6 are urethane prepolymers consisting of polyetherdiol and phenylisocyanate segments. PU-3 has a high polypropyleneglycol content, while PU-6 is high in polyethyleneglycol (1).

High-performance liquid chromatographic determination of tentoxin in fermentation of Alternaria porri (Ellis) Ciferri

Abstract Tentoxin is an interesting non-specific toxin produced by some Alternaria species, known as pathogenic organisms. The high-performance liquid chromatographic determination of tentoxin by using a YMCA-312 column, a reversed type of octadecylsilica, with 0.05 M ammonium dihydrogenphosphate—acetonitrile (7:3) as the mobile phase is described. The limit of detection is 0.1 μg/ml. One assay can be performed by using culture liquid without any other procedures within 30 min.