The estimation of free chloine in plants

Studies on the storage of potatoes: I. Changes in composition during storage in clamps

“…These changes were analogous to those in the carbohydrate fractions, but began earlier, and like them may be an expression of senescence of the tubers, or may have a direct relation to the process of sprout development. The nitrogen distribution in August corresponds closely with that found by Street, Kenyon & Watson (1946) in sprouted King Edward seed tubers at the end of April.…”

Review of Recent Work on Nitrogen Metabolism

“…Choline has been largely neglected by plant biochemists in recent years. Possibly the methodological work of Street, Kenyon & Watson (19466) may help to repair this omission. It has been shown by earlier workers to be widespread in plants; Street et al (19466) found it in all parts tested of four solanaceous species (except depleted tubers of Solanum tuberosum), and Miiller & Armbrust (1940) in the soy bean.…”

“…Possibly the methodological work of Street, Kenyon & Watson (19466) may help to repair this omission. It has been shown by earlier workers to be widespread in plants; Street et al (19466) found it in all parts tested of four solanaceous species (except depleted tubers of Solanum tuberosum), and Miiller & Armbrust (1940) in the soy bean. Betaines (especially glycine betaine and trigonelline) are other methylated compounds widespread in plants but of unknown metabolic role.…”

Food

“…The ultraviolet absorption maximum (325 µ) for choline reineckate in acetone solution is suggested as the basis for estimation of choline (384). An improvement in the specificity of reineckate methods has been described (350) in which the derivative is treated with dilute alkaline permanganate and converted to trimethvlamine. A high degree of specificity is claimed for this procedure.…”