Lipid Composition of Commercial Bakers' Yeasts Having Different Freeze-tolerance in Frozen Dough

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概要

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• The lipid composition of some commercial bakers' yeasts having different freeze-sensitivity in frozen dough was investigated to clarify the correlation between their lipid composition and freeze-tolerance. The total lipid content including neutral lipid, free fatty acid, sterol, and phospholipid ranged between 23.0 to 32.2 mg/100 mg protein of the yeasts tested. Phosphatidylcholine, phosphatidylethanolamine, phosphatidylinositol, and phosphatidylserine were the main phospholipids found in all yeast strains, but no distinct difference in these components between freeze-tolerant and freeze-sensitive strains was observed. Palmitoleic (C16:1), oleic (C18:1), palmitic (16:0), and stearic (C18:0) acids were the major fatty acids present in total lipid and phospholipid, and unsaturation indices of fatty acid in these lipid components were almost equal by the strains. The molar ratios of sterol to phospholipid of freeze-sensitive strains were higher than those of freeze-tolerant strains. The difference in the sterol-phospholipid ratio that influences the fluidity of plasma membranes in yeast cells was supposed to reflect the difference in freeze-sensitivity of bakers' yeast.

• 1996-11-23

著者

• MURAKAMI Yoko

  Department of Food Science and Nutrition, Nara Women's University

• YOKOIGAWA Kumio

  Department of Food Science and Nutrition, Nara Women's University

• KAWAI Fusako

  Department of Biology, Kobe University of Commerce

• KAWAI Hiroyasu

  Department of Food Science and Nutrition, Nara Women's University

• Kumagai Hidehiko

  Faculty Of Agriculture Kyoto University

• Kumagai Hidehiko

  Res. Inst. For Bioresources And Biotechnology Ishikawa Prefectural Univ.

• Kumagai Hidehiko

  Division Of Integrated Life Sciences Graduate School Of Biostudies Kyoto University

• Kawai F

  Department Of Biology Kobe University Of Commerce

• Murakami Y

  Shizuoka Univ. Shizuoka Jpn

• Kawai Hiroyasu

  Department Of Food Science And Nutrition Nara Women's University

• Kumagai H

  Department Of Agricultural Chemistry The University Of Tokyo

• Kawai Fusako

  Department Of Agricultural Chemistry College Of Agriculture Kyoto University

• Kumagai Hidehiko

  Graduate School Of Biostudies Kyoto University

• Yokoigawa K

  Nara Women's Univ. Nara Jpn

• Yokoigawa Kumio

  Department Of Food Science And Nutrition Nara Women's University

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