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Viscosity Behaviour of the Mucilage Extracted from Ruredzo ( Dicerocaryum zanguebarium )
Author(s) -
Benhura Mudadi A. N.,
Marume Maud
Publication year - 1994
Publication title -
starch ‐ stärke
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.62
H-Index - 82
eISSN - 1521-379X
pISSN - 0038-9056
DOI - 10.1002/star.19940460307
Subject(s) - mucilage , viscosity , chemistry , sucrose , zinc , potassium , chromatography , calcium , nuclear chemistry , botany , food science , materials science , organic chemistry , composite material , biology
The concentration of metal ions in the mucilage that is extracted from Ruredzo ( Dicerocaryum zanguebarium ) was determined by atomic absorption spectroscopy. Calcium, magnesium, potassium, iron, copper, lead and zinc were found to occur in concentrations ranging from 0.01 ppm for lead to 15 ppm for calcium. Cations were removed from solutions of the mucilage using Dowex 50W‐X12 resin and the viscosity of the decationized mucilage studied. Addition of CaCl 2 , NaCl and sucrose decreased the viscosity of the decationized mucilage but addition of sucrose resulted in an increase in viscosity. The effect of incubating the mucilage at various temperatures for up to 30 min before measuring the viscosity at 25°C was investigated. No change in viscosity was observed for samples incubated at 40°C and 60°C. 80°C incubation resulted in reduced viscosity. Solutions of the decationized mucilage exhibited maximum viscosity at pH 5.