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of golden coffee, which means a total of 6% of ingredients with unique characteristics and likely to hinder the extraction and quality of the beverage.The physical, chemical and sensory characteristics allowed to obtain espresso coffee beverages with high quality, optimized with a higher content of bioactive compounds and peculiar characteristics when compared with other commercial blends (commercial coffee blends in capsules and coffee blends in a sealed package with one-way degassingvalve). The extracted beverages showed variations between the tested machines, being found that afiner grind and a lighter roast increase total polyphenols. The antioxidant activity was enhanced by a higher content of Robusta coffee (contains more caffeine and CGA) subjected to medium–light roast (to protect the phenolic compounds). Arabica coffee was subjected to a medium roasting where the balance between the degradation of the phenolic compounds and the formation of melanoidins was considered. The golden coffee presented itself as anextremely rich source in polyphenols, overcoming the low content of silverskin. With respect to the amount of antioxidants and regardless of the source and process, there was a reasonable variation in all samples analyzed. However, the coffees withfiner grind were those with a higher antioxidant capacity. Compared to the consumer controls (coffee blends in a sealed package with one-way degassing-valve and commercial coffee blends in capsules), the espresso obtained from the functional coffee blend showed a higher content of bioactive compounds of caffeine, trigonelline, chlorogenic acids and theobromine, whereas the DQOOL machine extracted more bioactive compounds than Briel. Thediverse set of tests (preliminary tests offlavors approvals, hedonic evidence and quantitative descriptive analysis) allowed the formulation of thefinal blend, which was validated by the judges and whose acceptability was confirmed by the consumers. The acceptability is considered a positive indicator for implementing the functional coffee blend in the market and its future trading
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