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Plant Physiology 1968-Apr

Release of free fatty acids and loss of hill activity by aging spinach chloroplasts.

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Nuoroda įrašoma į mainų sritį
G Constantopoulos
C N Kenyon

Raktažodžiai

Santrauka

The free fatty acid content of spinach chloroplasts, isolated at pH 5.8 to 8.0, has been found to vary between 3.1 and 5.5% of the total chloroplast fatty acids. When chloroplasts were incubated at room temperature for 2 hours, the free fatty acids increased by 42% and the Hill activity decreased by 70%. After 2 hours of incubation at 37 degrees , the free fatty acids increased about 3-fold and the Hill activity decreased to almost 0. The addition of crystalline bovine serum albumin largely prevented the loss of Hill activity at room temperature and at 5 degrees , but had little effect during incubation at 37 degrees . Both the release of free fatty acids and the loss of Hill activity were pH dependent. The losses were the least during incubation at pH 5.8 and the greatest during incubation at pH 8.0. The major free fatty acids released at pH 5.8 were saturated, while those released at pH 7.0 or 8.0 were mainly the unsaturated acids, alpha-linolenic acid and hexadecatrienoic acid.

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