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HIGH METHOXYL PECTIN/APPLE PARTICLES COMPOSITE GELS: EFFECT OF PARTICLE SIZE AND PARTICLE CONCENTRATION ON MECHANICAL PROPERTIES AND GEL STRUCTURE
Author(s) -
GENOVESE DIEGO B.,
YE AIQAIN,
SINGH HARJINDER
Publication year - 2010
Publication title -
journal of texture studies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.593
H-Index - 54
eISSN - 1745-4603
pISSN - 0022-4901
DOI - 10.1111/j.1745-4603.2010.00220.x
Subject(s) - pectin , particle size , rheology , brittleness , materials science , pulp (tooth) , composite number , composite material , penetration (warfare) , chemistry , food science , mathematics , medicine , pathology , operations research
In order to study the effect of fruit pulp on the structure of fruit jams, they were modeled as composites with a high‐methoxyl pectin (HMP) gel matrix filled with apple particles. The effect of particle concentration (0, 1 and 2 wt%) and particle size (small: < 125 µm, and large: 125–850 µm) on a pectin gel (0.5 wt% HMP, 65 wt% glucose, pH 3.0, 0.1 M citrate buffer) were studied. Rheological measurements showed that increasing concentration of small particles produced a significant increase in the elastic modulus of the composite gels. Penetration tests showed that 1 wt% small particles produced a significant decrease of gel strength, rupture strength, adhesiveness and brittleness. Increasing particle size produced a further decrease of these properties (only significant for gel strength). When concentration of small particles was raised to 2 wt%, these parameters (except brittleness) increased back to the control sample (0% particles) values.PRACTICAL APPLICATIONS Knowledge of the effect of fruit particles on the structure of pectin gels would allow controlling the rheological and mechanical properties of fruit jams in terms of the size and concentration of fruit pulp used in their formulation.