Abstract
Intact chloroplasts were separated from large volumes of spinach brei by continuous-flow zonal centrifugation in the CF-6 rotor in gradients of colloidal silica. Tests with the Z-15/Mark 10 rotor showed that the external membranes of chloroplasts were sensitive to high rotor speeds and especially to the bore of the fluid seal. Enlargement of the CF-6 seal channel diameter to 4 mm resulted in almost complete recovery of the intact chloroplasts.
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