Strawberry aroma change

Medas and Simatose [4.13] and Sauvageot and Simatose [4.14] arrived at similar conclusions for strawberries and orange juice. The freezing rate changed the RM and the rehydration differently for different types. Also, the retention of aroma depends not only on the freezing rate but also on the layer thickness of the juice, the original... 

Cyclopentenolones with a planar vicinal enol-oxo configuration are known to be powerful aroma active substances with distinct caramel notes. By methylation of the enolic function, this flavour impression is changed drastically to a sweet, mildew, and mouldy odour in the case of 2,5-dimethyl-4-methoxy-3-[2H]-furanone (2). This so-called mesifurane as well as pineapple ketone (1) were stereodifferentiated with modified cyclodextrin [103], Although (1) and (2) can be stereoanalyzed without any racemization, both compounds were detected in strawberries, pineapples, grapes and wines as racemates (Fig. 6.43). 

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