Efficient extraction and characterization of pectin from orange peel by a combined surfactant and microwave assisted process.

Affiliation

Hunan Agricultural Product Processing Institute, Hunan Academy of Agricultural Sciences, Changsha 410125, China; Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, China. Electronic address: [Email]

Abstract

Surfactant and microwave assisted extraction (S-MAE) was used for pectin extraction from orange peel. First, we optimized the conditions of microwave assisted extraction (MAE), e.g., irradiation time, liquid-to-solid ratio (LSR), and pH on pectin yield (PY), galacturonic acid (GA) content, and degree of esterification (DE) using a Box-Behnken design. Under optimal conditions (pH 1.2, 7.0 min, and 21.5 v/w LSR), we obtained a PY of 28.0 ± 0.5%, which was close to the predicted value (31.1%). Second, we analyzed the effect of surfactant on microwave extraction of pectin. Among the surfactants investigated, Tween-80 (8 g/L, w/v) increased PY by 17.0%. Compared with conventional solvent extraction, S-MAE is a novel and efficient method for pectin extraction, which generated a higher (p < 0.05) PY (32.8%), GA content (78.1%), DE (69.8%), and Mw (286.3 kDa).

Keywords

Carbazole (PubChem CID: 6854),D-(+)-galacturonic acid (PubChem CID: 152867),D-(+)-glucose (PubChem CID: 5793),Ethanol (PubChem CID: 702),Extraction,Hydrochloric acid (PubChem CID: 313),Microwave assisted extraction,Optimization,Orange peel pectin,Polyethylene glycol (PubChem CID: 174),Sodium dodecyl sulfate (PubChem CID: 3423265),Sodium hydroxide (PubChem CID: 14798),Surfactant,Tween-20 (PubChem CID: 443314),Tween-80 (PubChem CID: 5281955),

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