Impact of single and mixed cultures of yeasts and lactic acid bacteria in coffee fermentation and cup quality

Author:

Estela‐Escalante Waldir D.1ORCID,Rodriguez‐Portilla Liz M. I.2,Pinillos‐Miñano Ricardo M.3,Rojas‐Ocupa Elton J.3,Lozada‐Castillo Karina L.1,Hatta‐Sakoda Beatriz A.3,Pérez Americo Guevara3

Affiliation:

1. Laboratorio de Bioprocesos y Tecnología de Fermentación, Facultad de Química e Ingeniería Química Universidad Nacional Mayor de San Marcos Lima Perú

2. Escuela de Posgrado, Facultad de Farmacia y Bioquímica Universidad Nacional Mayor de San Marcos Lima Perú

3. Escuela de Posgrad, Facultad de Industrias Alimentarias Universidad Nacional Agraria La Molina Lima Perú

Abstract

AbstractSaccharomyces cerevisiae LBTF 21.3, Pichia manshurica LBTF 21.1, and Leuconostoc lactis LBTF 21.1 were used as single and mixed cultures in coffee fermentations. Fermentations carried out in glass jars with P. manshurica LBTF 21.1/Leuc. lactis LBTF 21.1 showed higher fermentation rates than S. cerevisiae LBTF 21.3/P. manshurica LBTF 21.1 or S. cerevisiae LBTF 21.3/Leuc. lactis LBTF 21.1. The highest cup quality was reached with P. manshurica LBTF 21.1/Leuc. lactis LBTF 21.1 (83.0 points). Full factorial design (22) carried out with P. manshurica LBTF 21.1 revealed that the higher proportion of water added before the fermentation resulted in higher production of acetic acid. A contrary effect of this variable was observed on the production of lactic acid with Leuc. lactis LBTF 21.1. Fermentations conducted in bioreactor evidenced the production of acetaldehyde by P. manshurica LBTF 21.1/Leuc. lactis LBTF 21.1, P. manshurica LBTF 21.1, and Leuc. lactis LBTF 21.1. Additionally, the highest cup quality was reached in fermentations with P. manshurica LBTF 21.1 (82.5 points) followed by Leuc. lactis LBTF 21.1 (81.5 points) and P. manshurica LBTF 21.1/Leuc. lactis LBTF 21.1 (81.0 points). Fermentations of coffee with single and mixed cultures are interesting strategies for the improvement of the sensory quality.

Publisher

Wiley

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