Selective recovery of phenolic compounds and carbohydrates from carob kibbles using water-based extraction

Carob kibbles are an important renewable source of valuable compounds, such as fermentable sugars and phenolic compounds. However, the selective recovery of these compounds is not a trivial task. In this work, a strategy was developed to enable the recovery of both classes of compounds by means of awater-based extraction.One-step extraction recovered only approximately 20% of the phenolic compounds, corresponding to an extraction yield of 0.6 g Gallic acid equivalents (GAE)/100 g dry mass of carob kibbles. The obtained extract contained a significant amount of carbohydrates (110 g/L). The alternative two-step extraction developed enabled higher compound selectivity together with an increase in the yield of the phenolic compounds to about 70%, corresponding to 1.9 gGAE/100 g carob dry matter.The two-step extraction was easily scaled-up and is an effective method to obtain significantly sepa-rated carbohydrates and polyphenol-rich streams that can be further processed, e.g., in biorefineries orfood industries, respectively.

Keywords

Biorefinery Aqueous extraction Fermentation technology Glucose Fructose Phenolic compounds

URI

http://hdl.handle.net/10400.9/2877

Citation

Almanasrah, M.; Roseiro, L.B.; Bogel-Lukasik, R. [et.al.]. - Selective recovery of phenolic compounds and carbohydrates from carob kibbles using water-based extraction. In: Industrial Crops and Products, 2015, Vol. 70, p. 443-450