Evaluation of coffee pulp as substrate for polygalacturonase production in solid state fermentation

  • Rosa Amarilis Rodríguez Frómeta
  • José Laencina Sánchez
  • José María Ros García Department of Food Science & Technology and Human Nutrition, Faculty of Veterinary. University of Murcia, 30100 Murcia, Spain


The purpose of this research is to evaluate the coffee pulp, a by-product of coffee processing, as substrate for polygalacturonase production by solid state fermentation. In addition, it is a way to take advantage of the coffee pulp. Characterization of the coffee pulp revealed a high content of nutrients for fungi growth, such as reducing sugars (5.4% of dry pulp), proteins (9.4% of dry pulp), pectins (20.5% of dry pulp), which are inducers of pectic hydrolases production and source of carbon after degradation, and caffeine (1.4% of dry pulp), among others. The characterization of the cell-wall of coffee pulp revealed, after polysaccharides fractionation, the content in cell-wall pectins (25.5%), hemicelluloses (11.5%) and cellulosic residue (44%). A strain of Aspergillus niger, called van Thiegem, has been selected as a good producer of polygalacturonases (60 U/ml) using the coffee pulp as the growth substrate. During fermentation, reducing sugars, caffeine and phenolic compounds were consumed till almost exhaustion. A partial characterization of the polygalacturonase using high methoxyl pectin as substrate indicates an optimal pH of 4.0 and 45oC as optimal temperature, which are good values for the use of the enzyme in vegetable processing, including coffee processing.

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How to Cite
Frómeta, R. A. R., J. L. Sánchez, and J. M. R. García. “Evaluation of Coffee Pulp As Substrate for Polygalacturonase Production in Solid State Fermentation”. Emirates Journal of Food and Agriculture, Vol. 32, no. 2, Mar. 2020, pp. 117-24, doi:https://doi.org/10.9755/ejfa.2020.v32.i2.2068. Accessed 7 June 2020.
Research Article