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Volume 53, Issue 2
Displaying 1-8 of 8 articles from this issue
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Tunenori INOUE, Rikisaku SUEMITSU1979 Volume 53 Issue 2 Pages 45-50
Published: 1979
Released on J-STAGE: November 21, 2008
JOURNAL FREE ACCESSThe isolation of a mercury compound was attempted from bedsediments of Itomuka pond near the upper stream of Tokoro river locating in the north Hokkaido, into which waste water of the mercurial mine was drained and so the organic mercury compound appears to be generated in the sediments. The mercury compound was extracted with 0.1 N NaOH, salted out with NaCl and isolated by Sephadex G-100 and G-200 gel filtration from the sediment, according to the procedure of extraction of humic substance. The purity of the compound was confirmed by TLC and electrophoresis. The compound was characterized by UV and IR spectra, element analysis, molecular weight estimation and amino acid analysis. The data suggested that the compound is a polypeptide with the molecular weight of 100, 000 daltons and that mercury makes a complex with it.View full abstractDownload PDF (258K) -
Tatsumi UMEHARA, Junji TERAO, Setsuro MATSUSHITA1979 Volume 53 Issue 2 Pages 51-56
Published: 1979
Released on J-STAGE: November 21, 2008
JOURNAL FREE ACCESSEleven artificial food colorings approved by the Food Sanitation Law of Japan and fourteen of those prohibited were examined for their abilities to sensitize the photooxidation of methyl linoleate by incubating under illumination of visible light. Erythrosine, rose bengale, phloxine and eosine were found to act as a sensitizer of photooxidation and gave the 9-, 10-, 12- and 13-hydroperoxide isomers. The proportions of the 9- and 13-isomers were slightly higher than those of the 10- and 12-isomers. The isomeric compositions obtained suggest that these food colorings. generate singlet oxygen.
Twenty natural food coloring preparations were also examined for their abilities to sensitize the photooxidation, and two preparations containing chlorophyll were found to act as a sensitizer of photooxidation.
Photooxidation of triglycerides purified from safflower oil was accelerated with the higher concentration of chlorophyll. Although β-carotene inhibited photooxidation of triglycerides in the presence of chlorophyll, BHT had little influence as an inhibitor.View full abstractDownload PDF (291K) -
Hiromu KAMEOKA, Hideto KISHI1979 Volume 53 Issue 2 Pages 57-60
Published: 1979
Released on J-STAGE: November 21, 2008
JOURNAL FREE ACCESSThis paper deals with the chemical component of the essential oil from Trapa natans L. var. bispinosa M., one of the water plants. Each component was isolated by means of chemical treatment, column chromatography and preparative gas chromatograpy from the oil.
Following compounds were confirmed by gas chromatographical and spectral data; hexyl acetate, cis-3-hexen-1-ol, benzyl acetate, dodecanol, tetradacyl acetate, C18_??_C27 alkanes, guaiacol, phenol, eugenol, iso-eugenol, C10-C18 saturated fatty cids, oleic acid, linoleic acid, linolenic acid and so on.
The acetates, the major constituents are characteristic of this oil.View full abstractDownload PDF (272K) -
Akiko KAWABATA, Shigeru SAWAYAMA, Toshio KAMATA1979 Volume 53 Issue 2 Pages 61-67
Published: 1979
Released on J-STAGE: November 21, 2008
JOURNAL FREE ACCESSAs a means for elucidating the gelling mechanism for pectin, the association of low-methoxyl pectin (LM-pectin) due to Ca2+ was examined from the molecular weights and molecular size, using the one-concentration approximation method in ight scattering measurement over and below the critical concentration.
The critical concentration of the LM-pectin was found to be 0.02g/dl.
10_??_30% Ca2+ based on the amount of pectin was added to the 0.004_??_0.1% LM-pectin in 0.1 M NaCl aqueous solution. Thereafter the weight-average molecular weights (MW) and radius of gyration (RG) were measured up to the reaction time of 240min. The changes in molecular weights and size due to the intra- and intermolecular cross-linkage were found to be dependent on the level of pectin and the amount of Ca2+ added. The behavior of the changes over the critical concentration was different from that below it.
The solution diluted to 1/5 of the critical concentration slightly increased the molecular weights due to the intramolecular cross-linkage, but slightly contracted the molecule due to the intramolecular cross-linkage. As the level of pectin became a little higher, some increase in the molecular weights due to the intermolecular cross-linkage occurred. The intermolecular crosslinkage proceeded with the elapse of time, and the molecules gradually stretched and expanded to the rodlike shape.
Over the critical concentration, the higher the level of pectin or Ca2+ was, the more the intermolecular cross-linkage proceeded and the molecular weights increased. But the cross-linked particles contracted to the size smaller than that of the molecule of the original sample due to the intra- and intermolecular cross-linkage.View full abstractDownload PDF (293K) -
Tomoko TAKAHASHI, Hiromi HOSHINO, Masanao OYA1979 Volume 53 Issue 2 Pages 69-72
Published: 1979
Released on J-STAGE: November 21, 2008
JOURNAL FREE ACCESSCyclodipeptides, diketopiperazine, consisting different amino acids were synthesized by the reac-tion of α-amino acid benzylester p-toluenesulfonates with N-carboxy-α-amino acid anhydrides, except glycine N-carboxy anhydride, where both compounds were stirred, or allowed to stand, at room temperature or at low temperature for about one week or longer. This method was applicable to synthesis of cyclodipeptides with functional side chains.View full abstractDownload PDF (139K) -
Mitsuo MIYAZAWA, Hiraku IKEDA, Hiromu KAMEOKA1979 Volume 53 Issue 2 Pages 73-76
Published: 1979
Released on J-STAGE: November 21, 2008
JOURNAL FREE ACCESSThe constituents of the essential oils of Oenothera grandiflora L'HÉR. ex AIT. and O.erythrosepala BORBAS have been studied. The essential oils were obtained by steam distillation of the herb parts.
Each essential oil as separated into individual components by a combination of chemical method and elution chromatography or preparative gas chromatography. These components were identified from their infrared spectrum, mass spectrum, nuclear magnetic resonance spectrum.
As a result, seventy-nine compounds were identified as the constituents of these oils: α pinene, camphene, β-pinene, β-myrcene, limonene, iso-amyl alcohol, n-amyl alcohol, n-hexanol, cis-3-hexen-1-ol, n-nonyl aldehyde, 1-octen-3-ol, n-heptanol, trans-linalool oxide, furfural, cis-linalool oxide, benzaldehyde, furfuryl acetate, linalool, n-octanol, linalyl acetate, furfuryl alcohol, β-caryophyllene, α-terpineol, benzyl acetate, α-terpinyl acetate, γ-muurollene, benzyl alcohol, δ-cadinene, γ-cadinene, calamenene, β-phenyl ethyl alcohol, n-C10_??_C38 aliphatic hydrocarbons, n-C4_??_C18 aliphatic fatty acids, 2-furan carboxylic acid, benzoic acid, oleic acid, linoleic acid, phenol, o-cresol, p-cresol, thymol, eugenol.
The major component of each essential oil was furan derivative.View full abstractDownload PDF (279K) -
II. Outline, Title, Authorship, Abstract and IntroductionSatoshi HIBI1979 Volume 53 Issue 2 Pages L7-L13
Published: 1979
Released on J-STAGE: November 21, 2008
JOURNAL FREE ACCESSThe abstract should be directly related to the title and state the factual essence of the study. It will most likely be read in an abstracting periodical, such as Biological Abstracts or Chemical Abstracts. It should thus be complete by itself, independent of the text, and written in language that is easily understood. Abstracts for Agric. Biol. Chem. should be of the informative type, not the descriptive type. The abstract should state the purpose of the study if this is not implicit, the specific procedures used, the qualitative and quantitative data and their implications. Vague descriptive statements without factual information should be omitted. Examples of such statements are: “The findings are discussed” and “Further research is necessary.”
There are other faults to avoid. A background review is not necessary. The first sentence should not repeat the title, as the abstract is always read with the title. Tables and figures are not used, and they are not printed by abstracting periodicals. References to the literature, footnotes and unexplained abbreviations should not be included. The abstract content should reflect the text, and points not mentioned in the text should not be stated, and speculations in the text should not be stated as conclusions in the abstract. Summaries are usually read after the text and may refer to the text, graphic data or literature.View full abstractDownload PDF (382K) -
N. Y.1979 Volume 53 Issue 2 Pages N13-N15
Published: 1979
Released on J-STAGE: November 21, 2008
JOURNAL FREE ACCESSDownload PDF (239K)
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