Pectooligosaccharides rich in galacturonic acid produced from Orange Processing Waste by autohydrolysis: Process optimization and kinetic analysis
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2023
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Elsevier
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Pablo Comendador Morales, Alberto García-Martín, Miguel Ladero. Pectooligosaccharides rich in galacturonic acid produced from Orange Processing Waste by autohydrolysis: Process optimization and kinetic analysis. Bioresource Technology Reports, Volume 21, 2023, 101369.
Abstract
Pectooligosaccharides (POS) are notorious for their prebiotics and elicitor activities. In this work, we have
optimized the autohydrolysis of Orange Processing Waste (OPW) to obtain POS fractions via a Taguchi approach,
maximizing homogalacturonan oligosaccharides yield by considering several process variables: particle diameter, stirring speed, liquid-solid ratio and time, determining that only time had a significant effect in the studied
range. 19.38 % w/w POS yield from OPW was obtained in optima conditions. After ensuring no limitation due to
mass transfer, the kinetic analysis assumed that homogalacturonan was converted into high, medium and low
molecular weight oligosaccharides, and galacturonic acid. Moreover, we considered that there is one pseudohomogeneous reaction type combined with three irreversible, elemental, of pseudo first global order (first
order with respect to the reagent which is hydrolysed) reactions in series. The model successfully reproduced
experimental data at constant temperature (150 ◦C–180 ◦C) and pH (3.73).