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Hydrolysis of Hazelnut Shells as a Carbon Source for Bioprocessing Applications and Fermentation

  • Sibel Uzuner and Deniz Cekmecelioglu EMAIL logo
Published/Copyright: October 30, 2014

Abstract

Hazelnut shells are generated in large amounts from hazelnut processing. Currently, it is used as fuel. However, reuse in bioprocessing can release remarkable content of sugars, which can be used for production of additives such as enzymes widely used in the food industry. Thus, the present study was undertaken to determine the effect of single and combined chemical and enzymatic hydrolysis on the production of fermentable sugars from hazelnut shells. Batch hydrolysis was carried out under various conditions to select optimal conditions. The results revealed that an optimal sugar concentration of about 19.2 g/l was achieved after 3.42% (w/w) dilute acid pretreatment conducted at 130°C for 31.7 min and enzymatic load of 200 U/g for 24 h. The overall sugar yield was calculated as 72.4% (g reducing sugar/g total carbohydrate). Therefore, hazelnut shells can be considered a suitable feedstock to compete with synthetic sugars used in fermentations.

Acknowledgements

Funding for this study was provided by METU Research Fund Project, BAP-03-14-2011-002 at the Department of Food Engineering, Middle East Technical University, Turkey. The authors would like to thank Dr Tamay Seker and Ceren Biler at the Middle East Technical University Central Laboratory, Ankara, Turkey, for assistance with HPLC analyses.

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Published Online: 2014-10-30
Published in Print: 2014-12-1

©2014 by De Gruyter

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