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A collaborative study on the determination of cyst(e)ine in feedingstuffs
Author(s) -
Williams Alwyn P.,
Hewitt David,
Cockburn John E.
Publication year - 1979
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740300505
Subject(s) - casein , fish meal , soya bean , variation (astronomy) , zoology , food science , biology , fish <actinopterygii> , mathematics , chemistry , physics , fishery , astrophysics
Work was carried out at eight laboratories to assess the Moore 1 and Spencer and Wold 2 procedures for the determination of cyst(e)ine in casein, fishmeal, extracted leaf protein concentrate, groundnut, soya bean and wheat. Variation between duplicate hydrolyses within laboratories was similar by both methods (mean coefficients of variation 4.3 and 5.0 %) and smaller than the variation between laboratories (mean coefficients of variation 14.8 and 14.3%). Both methods appear to provide a satisfactory means of estimating cyst(e)ine in feedingstuffs with the exception of casein, but the Moore 1 method is preferred because methionine is estimated at the same time.