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Biomedical subjects

Y Mukaiyama

Publications and source records attributed to Y Mukaiyama.

5 recordsLinked to original sources
PubMed1998

[Preparation of optically active succinic acid derivatives. III. Regioselective condensation reactions of optically active 2-substituted succinic acids with diimidazolide].

We investigated the large scale synthesis of monocalcium bis [(2S)-2-benzyl-3-(cis-hexahydroisoindolin-2-ylcarbonyl) propionate] dihydrate (KAD-1229), which has a potent hypoglycemic effect, in a single reaction vessel. (2S)-2-Benzyl-3-(cis-hexahydroisoindolin-2-ylcarbonyl) propionic acid (7) was directly obtainable from (S)-2-benzylsuccinic acid (2) and cis-hexahydroisoindoline (4), without the isolation of intermediates by the method using thionyldiimidazole (9) and/or diimidazolide of the acid 2. Sequential reaction of imidazole with thionyl chloride, 2, and 4, followed by acid catalyzed hydrolysis gave amidecarboxylic acid 7 in 86% overall yield. The acid 7 was treated with 2 N NaOH, followed by the treatment with calcium chloride to give KAD-1229 in 91% yield.

Chemical Phenomena↗
PubMed1989

[Closure of patent ductus arteriosus in elderly cases].

A technique for closure of patent ductus arteriosus in the elderly cases is described. We have operated on eleven adult cases of patent ductus arteriosus cases in 10 years. In five cases cardiopulmonary bypass used and in the other six cases it was not used. The cardiopulmonary bypass was used especially for the patients with pulmonary hypertension (pulmonary artery mean pressure greater than 40 mmHg), or high aged (older than 40 years) patients. No operative death have occurred in both groups, and no complication from air embolism or hemorrhage have been encountered. The technique embodies the profound hypothermia, low flow, and direct suture of the pulmonary end of the ductus arterious through a pulmonary arteriotomy. The ductus has been obstructed by using a Hegar's dilator before core cooling was started. Hegar's dilator is useful for establishing profound hypothermia and satisfactory visualization of the operative field.

Adult↗
PubMed1988

High-performance affinity chromatography of human serum concanavalin A binding proteins.

A high-performance concanavalin A (Con A) affinity column Gelpack GL-L55C (Hitachi Kasei Industries) was successfully used for the fractionation of human serum Con A-binding proteins. Serum proteins that have strong affinity to Con A (ca. 11% of the recovered proteins) could be fractionated within 80 min. By analysing the eluates from the column by micro two-dimensional electrophoresis, followed by blotting and Con A staining, the specificity of the column was effectively visualized. Although the protein-binding capacity of the column gradually decreased during repeated loading of serum or tissue extracts, the specificity of the column to Con A-binding proteins did not change. Serum lipoproteins have been eluted from the column with 6 M urea, suggesting that the capacity decrease is caused by the binding of lipids or lipoproteins to the column.

Chromatography, High Pressure Liquid↗