The comparison of biological activity of chocolates made by different technological procedures
Keywords:chocolate, antioxidant activity, polyphenols, flavonoids, theobromine, caffeine
Chocolate is one of the most consumed delicacies in the world. Nowadays, raw chocolates without vanilla or allergens are getting more attention. The aim of this study was to evaluate and compare the biological activity of different types of chocolate - cold processed chocolate and chocolate made by traditional way. Total content of fat, crude fibre, polyphenols, flavonoids, phenolic acids and metylxantines - theobromine and caffeine was evaluated. The antioxidant activity was determined by a method using DPPH radical, reducing power method and phosphomolybdenum method. Both evaluated chocolates had similar content of fat and crude fibre, but sample of chocolate made by traditional way probably due to the higher content of cocoa mass had almost two times higher content of total polyphenols, flavonoids and phenolic acids as cold processed chocolate. Also the content of theobromine and caffeine was slightly higher in chocolate made by traditional way. This sample had the highest antioxidant activity - 93.68 mg TEAC.g-1 determined by phosphomolybdenum method, while in the sample of chocolate made by cold processed way was measeured value 50.82 mg TEAC.g-1. Similarly, reducing power of chocolate made by traditional way was almost two times higher, but antioxidant activity determined with DPPH method was similar in both samples (3.58 and 3.62 mg TEAC.g-1). The antioxidants and metylxantines in chocolates determine its potential to be a significant source of biologicaly active compounds with favorable effects to human health. It can be concluded in this study, that chocolate produced by conventional production technology can have more health-promoting ingredients reserved, but more extensive researches are still needed.
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