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An investigation into the physical properties of fibre prepared from several carrot varieties at different stages of development
Author(s) -
Robertson James A.,
Eastwood Martin A.,
Yeoman Michael M.
Publication year - 1980
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.2740310703
Subject(s) - daucus carota , dietary fibre , chemistry , cation exchange capacity , food science , water holding capacity , carrot juice , botany , biology , ecology , soil water
Important physical properties of dietary fibre include water holding capacity (WHC) and cation exchange capacity (CEC). In this investigation fibre prepared from different varieties of the same species, the carrot Daucus carota , have been sampled at different stages of development to determine whether these physical properties were dependent upon variety and the age of the plant. Results for WHC (g g −1 fibre) were dependent on the method of analysis. Differences found between varieties for WHC measured by centrifugation (mean 23.7 g, range 13.4–32.3) were not apparent when measured by filtration of a corresponding sample (mean 27.9 g, range 17.2–45.5). Differences between methods probably reflect structural differences in the fibre influenced by age and variety. Both methods showed carrot fibre to have a relatively high WHC. The CEC (meq g −1 fibre) was found to be similar between varieties but to increase with age within each variety, (mean 1.44 meq, range 1.07–2.42). The type of exchange did not change and the CEC 100 g −1 fresh carrot remained constant between varieties and also within each variety. The pK determined for each sample was between 4.42–5.30 which suggests pectins to be responsible for the CEC.