Subcritical water extraction of low methoxyl pectin from pomelo (Citrus grandis (L.) Osbeck) peels

Shan Qin Liew; Wen Hui Teoh; Chee Keong Tan; Rozita Yusoff; Gek Cheng Ngoh

doi:10.1016/j.ijbiomac.2018.05.013

Subcritical water extraction of low methoxyl pectin from pomelo (Citrus grandis (L.) Osbeck) peels

Int J Biol Macromol. 2018 Sep:116:128-135. doi: 10.1016/j.ijbiomac.2018.05.013. Epub 2018 May 5.

Authors

Shan Qin Liew¹, Wen Hui Teoh², Chee Keong Tan³, Rozita Yusoff⁴, Gek Cheng Ngoh⁵

Affiliations

¹ Department of Chemical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia. Electronic address: sqliew@siswa.um.edu.my.
² Department of Chemical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia. Electronic address: whteoh@um.edu.my.
³ Department of Chemical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia. Electronic address: tanck@um.edu.my.
⁴ Department of Chemical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia. Electronic address: ryusoff@um.edu.my.
⁵ Department of Chemical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia. Electronic address: ngoh@um.edu.my.

PMID: 29738869
DOI: 10.1016/j.ijbiomac.2018.05.013

Abstract

Low methoxyl (LM) pectin was extracted from pomelo peels using subcritical water in a dynamic mode. The effects of pressure and temperature were analyzed through a face-centred central composite design. Extraction yield and the rate of extraction were found to be predominantly influenced by temperature. Optimization of the subcritical water extraction (SWE) yielded an optimized operating condition of 120°C and 30bar with a predicted pectin yield of 18.8%. The corresponding experimental yield was 19.6%, which is in close agreement with the predicted data. The pectin obtained from the optimized condition was further analyzed for its physicochemical properties. The kinetics of the SWE was also evaluated whereby the one-site kinetic desorption model was found to be in good agreement with experimental data (R²>0.94).

Keywords: Dynamic mode subcritical water extraction; Kinetic and physicochemical properties; Low methoxyl (LM) pectin.

MeSH terms

Citrus / chemistry*
Fruit / chemistry
Kinetics
Pectins / chemistry*
Temperature
Water / chemistry*

Substances

Water
Pectins