The vitamin B1 content of foods

Baker, Andrea; Wright, Margaret D.

doi:10.1042/bj0322156

Cited by 10 publications

(4 citation statements)

References 6 publications

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“…andthose " calculated", in thelast two columnsof Table VI, furnishes, we think, further independent evidence of the reliability of the bradyeardia method [see also Baker & Wright, 1938;Lunde et al 1938;Pedersen, 1938].…”

Section: Individual Animals Averagementioning

confidence: 69%

Methods for assessing the level of nutrition of the human subject. Estimation of vitamin B1 in urine by the thiochrome test

Wang

Harris

1939

Biochemical Journal

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IN earlier work [Harris & Leong, 1936; Harris et al. 1938] it was shown that the extent of the body's "reserves" of vitamin B1 might be measured by means of a test on the urine, similar in principle to that previously introduced for vitamin C [Harris et al. 1933; Harris & Ray, 1935]. The urinary output was found to depend on the past intake, being negligible in beri-beri or in "conditioned" deficiencies of vitamin B1 and being lowered in certain other abnormal states.To simplify the procedure, several investigators [e.g.

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Section: Individual Animals Averagementioning

confidence: 69%

Methods for assessing the level of nutrition of the human subject. Estimation of vitamin B1 in urine by the thiochrome test

Wang

Harris

1939

Biochemical Journal

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“…The majority of the biological tests were done by the bradyeardia method [Drury & Harris, 1930;Birch & Harris, 1934;Leong & Harris, 1937;Baker & Wright, 1938], the advantages of which have been discussed by several recent investigators [e.g. Todd & Bergel, 1937;van Veen, 1937;Karrer & Kubli, 1937;Pedersen, 1938;Lunde, 1938;Lunde et al 1938;Leong, 1939, 1, 2;Pannekoek-Westenburg & van Veen, 1939;Yang & Platt, 1939].…”

Section: Biological Comparisonsmentioning

confidence: 99%

Vitamin methods

Harris

Wang

1941

Biochemical Journal

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DURING the past two years a systematic study has been made in this laboratory of the various possible sources of error and the technical difficulties involved in the thiochrome test, based on the now well-known reaction first described by Jansen [1936]. These errors and difficulties are more serious than is generally appreciated. In an earlier paper [Wang & Harris, 1939] a procedure was described for urine, by which-interference from non-specific substances and various other problems of technique were successfully overcome. Our results were controlled by biological tests, and this proof of the reliability of the method applied to urine has been further confirmed since [see accompanying paper, Harris & Wang, 1941]. The present communication describes how the technique used by Wang & Harris mtny be adapted for estimating vitamin B1 in foodstuffs and in animal and plant tissues. As we have again repeatedly checked our results by biological assays, we feel considerable confidence in the method which we are now recommending.

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“…Thiamin was reported present in walnuts to the extent of 0.28 mg. per cent b y De Caro and Franceschini (1939) using a rat-survival method. Employing the rat-growth procedure, Booher and Hartzler ( 1939) found 0.34 mg. per cent thiamin in English walnuts, and Raker and Wright (1935), using the bradycardia method, found 0.45 mg. per cent.…”

Section: Vitamin Content O F Walnutsmentioning

confidence: 95%