Carotenoid composition of spinach chloroplast grana and stroma lamellae.
Stroma lamellae and grana stacks prepared by French press rupture of spinach (Spinacia oleracea) chloroplasts contain similar amounts of beta-carotene on a protein basis. The grana fraction has considerably more xanthophylls than does the stroma fraction. Total carotenoid to chlorophyll ratios are similar for both fractions.
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Seaver Chemistry Laboratory, Pomona College, Claremont, California 91711.
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