Optimization study of citrus wastes saccharification by dilute-acid hydrolysis
Artikel i vetenskaplig tidskrift, 2008

The effects of time, acid concentration, temperature and solid concentration on dilute-acid hydrolysis of orange peels were investigated. A central composite rotatable experimental design (CCRD) was applied to study the individual effects of these hydrolysis factors and also their interdependence effects. The enzymatic hydrolysis of the peels by cellulase, β-glucosidase, and pectinase enzymes resulted in 72% dissolution of the peels, including 18.7% galacturonic acid and 53.3% of a total of glucose, fructose, galactose, and arabinose. Dilute-acid hydrolysis up to 210°C was not able to hydrolyze pectin to galacturonic acid. However, the sugar polymers were hydrolyzed at relatively low temperature. The optimum results were obtained at 116°C, 0.5% sulfuric acid concentration, 6% solid fraction, and 12.9 min retention time. Under these conditions, the total sugars obtained at 41.8% dry peels and 2.6% of total hexose sugars were further degraded to hydroxymethylfurfural (HMF). No furfural was detected through these experiments from decomposition of pentoses.

Sugar optimization

Dilute-acid hydrolysis

Experimental design

Orange peel


Farid Talebnia Rowshan

Chalmers, Kemi- och bioteknik, Kemisk reaktionsteknik

Mohammad Pour Bafrani

Chalmers, Kemi- och bioteknik, Kemisk reaktionsteknik

M. Lundin

Högskolan i Borås

Mohammad Taherzadeh Esfahani

Högskolan i Borås


1930-2126 (ISSN) 19302126 (eISSN)

Vol. 3 1 108-122


Organisk kemi

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