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J Food Sci Technol. 2016 Jan;53(1):848-55. doi: 10.1007/s13197-015-2036-4. Epub 2015 Sep 25.

Variation of total aroma and polyphenol content of dark chocolate during three phase of conching.

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Department of Engineering, Gaziantep University, 27310 Gaziantep, Turkey.


Variation in the volatiles, total polyphenol, theobromine and caffein was investigated both qualitatively and quantitatively for all phases of conching with GC/MS/SPME, HPLC, GC/O, and UV-visible spectrophotometry. The volatile compounds being identified during the three phases consisted of aldehydes, ketones, pyrazines, acids, alcohols and esters. The number and concentration of these compounds were observed to be 31-25,681 ppb, 44-34,838 ppb and 44-29,809 ppb in the dry, pasty, and liquid phases respectively. The odor of dark chocolate was described as nutty, sweet, caramel, green and chocolate using olfactometry. The percent decrease in the concentration of total polyphenol, caffein and theobromine was observed to be only 3.0, 11.0, and 32.0 respectively.


Aroma; Caffein; Dark chocolate; Phases of conching; Polyphenol and theobromine

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