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Volume 26, Issue 3
Displaying 1-7 of 7 articles from this issue
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Fumikatsu TOKIWA, Tetsuya IMAMURA1977 Volume 26 Issue 3 Pages 143-149
Published: March 20, 1977
Released on J-STAGE: October 20, 2009
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Shizuyuki OTA, Etsuji YUKI1977 Volume 26 Issue 3 Pages 150-164
Published: March 20, 1977
Released on J-STAGE: October 20, 2009
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Masayuki NAKAGAKI, Noriaki FUNASAKI1977 Volume 26 Issue 3 Pages 165-168
Published: March 20, 1977
Released on J-STAGE: October 20, 2009
JOURNAL FREE ACCESSThe effect of hydrolysis on the surface tension of aqueous solution of 1-monolaurin was studied. The concentrations of 1-monolaurin, lauric acid, and glycerol were calculated according to the kinetic equation reported in the previous paper, taking the method of the preparation of 1-monolaurin solutions into account. The relation between the surface tension and the composition of solutions was obtained at various total concentrations. It was found that 1-monolaurin is more surface-active than lauric acid. From the equilibrium values of the surface tension of partially hydrolyzed 1-monolaurin solution, it was concluded that the adsorption equilibrium of surface phase was established faster than the chemical equilibrium in the surface phase.View full abstractDownload PDF (613K) -
Comparative Toxicity of Secondary Oxidation Products in Autoxidized Methyl LinoleateL. Raul Tovar, Takashi KANEDA1977 Volume 26 Issue 3 Pages 169-172
Published: March 20, 1977
Released on J-STAGE: October 20, 2009
JOURNAL FREE ACCESSIn previous papers, one of the authors reported that the most toxic compounds in autoxidized methyl linoleate were hydroperoxyalkenals containing 5 to 9 carbon atoms. The 50% lethal dose (LD50) of methyl linoleate hydroperoxyalkenals was determined, however, that of other low molecular weight secondary oxidation products (LMWOP) contained in autoxidized fats were not.
This paper deals with the determination of the LD50 of LMWOP. Methyl linoleate was autoxidized at 60°C by bubbling pure oxygen into the ester. LMWOP was separated by molecular distillation and further fractionated by dry column chromatography. Each of the fractions was tested for toxicity. The results indicated that the toxicity pattern according to functional groups was as follows : hydroperoxy alkenals>hydroxyaldehydes>alkenals>hydroperoxides>alkanals.View full abstractDownload PDF (624K) -
Makio MORITA, Miyoko OSUMI, Yoshiko YOKOYAMA1977 Volume 26 Issue 3 Pages 173-175
Published: March 20, 1977
Released on J-STAGE: October 20, 2009
JOURNAL FREE ACCESSA catalytic activity for autoxidation was observed in the methyl linolenate fraction which had been recovered from an autoxidizing methyl linolenate preparation by column chromatography using silicic acid and hexane. It was suggested that there is some catalytically-active material which is liable to contaminate the methyl linolenate recovered, but is unstable when in contact with silicic acid, and is readily lost on reduction with triphenylphosphine.View full abstractDownload PDF (395K) -
Yoshikazu INOUE, Masahisa ISHIGAMI1977 Volume 26 Issue 3 Pages 176-178
Published: March 20, 1977
Released on J-STAGE: October 20, 2009
JOURNAL FREE ACCESSDisproportionation and cleavage reaction of abietic acid by arylthiol was studied. Bis {1- (2-hydroxynaphthyl)} disulfide (BNDS) was an excellent catalyst among the several catalysts. When BNDS was used as the catalyst, disproportionation reaction of abietic acid proceeded predominantly at high temperatures, but at low temperatures cleavage reaction proceeded and secodehydroabietic acid was mainly produced.
When abietic acid was treated with 1wt% BNDS for 14 h at 200°C, reaction products were secodehydroabietic acid (54.8%), deisopropyldehydroabietic acid (11.7 %), dehydroabietic acid (11.5%), and abietic acid (3.6%). It was found that secodehydroabietic acid was obtained in reasonable yield at low temperature (200°C).View full abstractDownload PDF (470K) -
Triesters as Plasticizers for Poly (vinyl chloride)Kazuo KAWADA, Shoichiro WATANABE1977 Volume 26 Issue 3 Pages 179-181
Published: March 20, 1977
Released on J-STAGE: October 20, 2009
JOURNAL FREE ACCESSTriesters containing two ether linkages were prepared by the acylation of triol, which was synthesized by the reaction of ehtylene glycol with epichlorohydrin. These triesters were evaluated as plasticizers for poly (vinyl chloride) (PVC) by comparison with dioctyl phthalate (DOP) or dioctyl adipate (DOA). They were superior to DOP in low temperature flexibility, and equal to or superior to it in tensile properties. Particularly the low temperature properties of trihexanoate and trioctanoate were better than those of DOA.View full abstractDownload PDF (500K)
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