Two simple methods for the removal of small representative samples from carrots are described: (a) in the sector method narrow sectors are out and weighed; (b) in the cylinder method small rods are bored out and measured. The latter method is suitable for sampling in the field; the roots survive and may be replanted and grown on for seed production. A simplified and rapid procedure for the estimation of total carotenoids in the samples is described. The pigments are extracted with cold light petroleum‐acetone, and colorimetric determinations made directly on this solution. Carotene averages M% of the total carotenoids in mature carrots.
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V. H. Booth (1945) studied this question.