Novel microencapsulated yeast for the primary fermentation of green beer: kinetic behavior, volatiles and sensory profile. (15th March 2021)

• Record Type: Journal Article
• Authors: Benucci, Ilaria; Cecchi, Teresa; Lombardelli, Claudio; Maresca, Diamante; Mauriello, Gianluigi; Esti, Marco
• Is Part Of: Food chemistry. Volume 340(2021)
• Publication Date: 2021-03-15
• Subjects: Calcium alginate–chitosan microcapsules -- Primary alcoholic fermentation -- Green beer -- Kinetic of oxygen consumption -- Volatile compounds -- Sensory profile; Food -- Analysis -- Periodicals; Food -- Composition -- Periodicals; 664
• DOI: 10.1016/j.foodchem.2020.127900
• Languages: English
• ISSNs: 0308-8146

Abstract

Highlights: Brewing yeast was entrapped in chitosan-calcium alginate double layer microcapsule. Two different green beers were produced by microencapsulated or free yeast. Fermentable sugars were consumed more slowly by microencapsulated than free yeast. The green beers were characterized by similar physico-chemical parameters. The green beers significantly differed in volatiles content and sensory profile. Abstract: The development of innovative and more cost-effective approaches of making beer throughout continuous fermentation process remains a challenging problem, which is worthy of serious exploration. The current work focuses on the application of a commercial brewing yeast ( S. cerevisiae Nottingham Ale), entrapped into chitosan-calcium alginate double layer microcapsules, for the production of a Pale Ale beer. During the primary alcoholic fermentation, the consumption rate of fermentable brewing sugars and dissolved O2, estimated by the Gompertz equation, was halved in the beer obtained by encapsulated yeast in comparison with the free cell. The physical–chemical parameters of beer (i.e. pH, alcohol content, color and bitterness) were not remarkably affected by the different yeast-inoculating form. However, the volatile profiles identified by means of HS-SPME-GC–MS analysis, significantly differed in terms of terpenes, esters and alcohols content, thus proving that the yeast-inoculating form may typify the odor and flavor descriptors of the green beer.