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- Title
Degradation kinetics of passion fruit pectin in subcritical water.
- Authors
Klinchongkon, Khwanjai; Khuwijitjaru, Pramote; Adachi, Shuji
- Abstract
The degradation of passion fruit pectin by subcritical water treatment in a continuous flow-type reactor was investigated in the temperature range of 80?160 °C at a constant pressure of 5 MPa. Changes in the degree of polymerization and reducing end formation were monitored and modeled by applying the Emsley equation and zeroth-order kinetics, respectively. The results showed that both the pectin degradation rate constant and the change in the amount of reducing end were enhanced by temperature, and that the temperature dependence of these parameters obeyed the Arrhenius relationship. The activation energies for pectin degradation and reducing end formation were 62.8 and 86.9 kJ/mol, respectively. The non-linear relationship between the ratio of broken galacturonic acid units to the total galacturonic acid units and the change in the amount of reducing end indicated that pectin cleavage became easier as hydrolysis progressed. Depolymerization of passion fruit pectin in subcritical water was modeled using the Emsley equation, whereas the formation of reducing end groups was expressed by zeroth-order kinetics.
- Subjects
PECTINS; CHEMICAL decomposition; PASSION fruit
- Publication
Bioscience, Biotechnology & Biochemistry, 2017, Vol 81, Issue 4, p712
- ISSN
0916-8451
- Publication type
Article
- DOI
10.1080/09168451.2016.1277941