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Optimization study of citrus wastes saccharification by dilute-acid hydrolysis

Farid Talebnia (Institutionen för kemi- och bioteknik, Kemisk reaktionsteknik) ; Mohammad Pourbafrani (Institutionen för kemi- och bioteknik, Kemisk reaktionsteknik) ; Magnus Lundin ; M. J. Taherzadeh
Bioresources (1930-2126). Vol. 3 (2008), 1, p. 108-122.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Dilute-acid hydrolysis; Experimental design; Orange peel; Sugar optimization



Denna post skapades 2009-10-16. Senast ändrad 2016-07-25.
CPL Pubid: 100239

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Kemisk reaktionsteknik (2005-2014)

Ämnesområden

Bioorganisk kemi

Chalmers infrastruktur