Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 504095
Title Integration of galacturonic acid extraction with alkaline protein extraction from green tea leaf residue
Author(s) Zhang, Chen; Bozileva, Elvira; Klis, Frits van der; Dong, Yiyuan; Sanders, Johan P.M.; Bruins, Marieke E.
Source Industrial Crops and Products 89 (2016). - ISSN 0926-6690 - p. 95 - 102.
Department(s) Biobased Chemistry and Technology
FBR Sustainable Chemistry & Technology
Biobased Products
FBR Food Technology
Publication type Refereed Article in a scientific journal
Publication year 2016
Keyword(s) Biorefinery - Cellulase - Cost estimation - Experimental design - Leafy biomass - Recycle system

Leaf pectin can be used as a feedstock for galacturonic acid (GA) production, but high extraction costs limit economic feasibility. To improve the extraction efficiency, leaf pectin extraction was integrated with an already cost-effective alkaline protein extraction, focusing on high yield of GA without losses of protein. GA extraction efficiencies in NaOH, HCl, phosphate buffer solution, or with Viscozyme® L were determined using green tea residues (GTR) as model material. Most GA was extracted using Viscozyme® L, mainly due to its cellulase activity. Extraction yielded more than 95% GA with only 5% protein. Alternatively, GA-containing pectin can be extracted in a weak alkaline solution. Here, GA yield is dominated by the ratio of extraction volume to biomass weight. The profits of these two integrated processes can be higher than one step protein extraction. The Viscozyme® L integrated process is suitable for GA production for application in chemicals, and may have a profit of 142$/ton GTR when enzyme cost are sufficiently lowered. The profit of the weak alkaline integrated process is estimated at 118$/ton GTR.

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