The ether-soluble substances of cabbage leaf cytoplasm

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Abstract
CHIBNALL, ALBERT CHARLES, and HAROLD JOHN CHANNON. The ether soluble substances of cabbage leaf cytoplasm. VI. Summary and general conclusions. Biochem. Jour. 23(2): 168-184. 1929.[long dash]These 2 papers are parts of a series presenting some of the relations between P and the fatty substances in plant cells. "Although the higher paraffins have been isolated from a large number of plant sources, no evidence has been forthcoming as to their origin in the plant, and the lack of a reasonable hypothesis for their metabolism made it appear vital that the exact position of the carbonyl group should be established with certainty." The total amount of ether-soluble material in the cytoplasm is about 3.5% of the total leaf solids. Since fat-soluble substances containing Ca and Fe had not been demonstrated previously, the proportion of Ca, P, and Fe of the cabbage-leaf present in the form of Ca phos-phatidate and the Fe compound was calculated roughly. Water-soluble Fe was too small to be determined gravi-metrically. The I value of the glyceride fatty acids is about 200 compared with 137 for the fatty acids present in the phosphatide.

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