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Effect of the influence of temperature and calcium (Ca 2+) ion concentration on the rheological properties of pectin viz. storage modulus (G′) and loss (G′′) oscillatory moduli of low methoxyl pectin in the presence of varying amounts of Ca 2+ ion. It was observed that upon lowering the temperature in the presence of Ca 2+ , both G′ and G′′ increased immediately, followed by a further slow logarithmic increase with time. It was also noticed that storage modulus (G′) increased with rising calcium ion concentration initially but further raising the calcium ion concentration lowered the value of G′. The frequency sweep curves revealed that at lower concentrations, pectin-Ca 2+ samples exhibited viscoelastic behaviour but at higher concentrations, elastic and well-structured gel-like properties were evident.

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concentrations.