EFFECT OF THE ADDITION OF SELECTED HERBS ON THE TECHNOLOGICAL AND SENSORY QUALITY OF BEER

Abstract

The aim of this work was to enhanced functionality of beer with natural materials such as selected herbs from Lamiaceae family (salvia, oregano, wild thyme, lemon balm) and consequently to determine the impact of the addition of herbs on the technological parameters and sensory profile of beer. For purposes of this study a top-fermented beer was produced and herbs: salvia (Salvia officinalis L), oregano (Origanum vulgare L.), wild thyme (Thymus serpyllum L.) and lemon balm (Melissa officinalis L.) were used for beer fortification. The basic qualitative parameters of beer as real extract, alcohol content, pH, colour, total polyphenol content and antioxidant activity were determined. Results showed that in the analysed samples, the values of the actual extract ranged from 3.64 wt.% to 4.02 wt.%. Alcohol content ranged from 3.99 vol.% to 4.46 vol.%. Total polyphenol content was significantly increased by the herbs addition to beer. The content of phenolic substances increased the most in beer with oregano 801.63 mg GAE.g^-1. Moreover, the antioxidant activity in beer samples enriched with herbs was significantly increased; it ranged from 50.30 mg TEAC.g^-1 (control beer) to 78.17 mg TEAC.g^-1 (beer with oregano). Values of antioxidant activity were positively correlated with the content of total polyphenols. Sensory evaluation of beer was conducted using a nine-level hedonic scale. Sensory analyses revealed that the most intense, pleasurable herbal aroma and taste was evaluated in beer with salvia. From the overall impression point of view beer enriched with wild thyme manifested the best performance.