Perceptions of consumer for preparation and consumption of tea and analysis of biologically active compounds of black tea (CROSBI ID 288081)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Nakov, Gjore ; Ivanova, Nastia ; Jukic, Marko ; Koceva Komlenic, Daliborka ; Daniloski, Davor ; Lukinac, Jasmina
engleski
Perceptions of consumer for preparation and consumption of tea and analysis of biologically active compounds of black tea
The aim of this study was to examine the opinion of tea drinkers about the type and the way the tea is prepared, as well as the knowledge of the biologically active substances contained in the black tea. Finally, the influence of the temperature and the method of preparation of black tea on its colour and content of biologically active compounds was determined. The survey found that black tea was the most consumed with 68.80% of the participants and has been also considered to be the healthiest type of tea (80.40%).Moreover, 39.50% of the respondents consumed tea once a month. Based on the results, tea has usually been prepared for a period of 5 min (74.10%) in boiling water at approximately 90°C (47.50%). In addition, 56.70% of the respondents believe that the black tea contains a high amount of caffeine. As the number of macerations increased, the amount of biologically active substances decreased (total polyphenols 134.93±0.04 mg GAE/mL, tannins 19.98±0.19%, flavonoids 232.84±0.07 mg QE/g, caffeine 37.33±0.12 mg/mL and antioxidant activity 551.94±0.41 µM Trolox/g in black tea infusions prepared in 90°C (5 min) after first maceration and 7.53±0.01 mg GAE/mL, tannins 14.92±0.24%, flavonoids 55.88±0.18 mg QE/g, caffeine 2.33±0.05 mg/mL and antioxidant activity 122.32±0.17 µM Trolox/g in black tea infusions prepared in 90°C (5 min) after third maceration. The obtained correlation (p>0.01) showed that the total polyphenols were correlated with other biologically active substances tested (tannins, flavonoids, caffeine and antioxidant activity) and L*, a* and b* colour parameters of black tea infusions.
antioxidant activity ; caffeine ; flavonoids ; polyphenols ; tannins
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
Podaci o izdanju
20 (1)
2020.
389-398
objavljeno
2284-7995
2285-3952
Povezanost rada
Biotehnologija, Farmacija, Nutricionizam, Prehrambena tehnologija