Differential volatile organic compounds signatures of apple juices from Madeira Island according to variety and geographical origin was written by Medina, Sonia;Perestrelo, Rosa;Santos, Rui;Pereira, Regina;Camara, Jose S.. And the article was included in Microchemical Journal in 2019.Electric Literature of C6H12O2 This article mentions the following:
One of the main food authenticity issues is related to productsâ?false labeling concerning their variety or geog. origin. For this reason, the aim of this study was to establish distinctive characteristics for the discrimination of apple juices according to regional varieties (Rijo, Verde, Ribeiro and Azedo) and geog. origin (Prazeres and Santo da Serra (Madeira Island)) on the basis of their volatile pattern by headspace solid-phase microextraction combined with gas chromatog. mass spectrometry (HS-SPME/GC-MS) combined with chemometric tools. The results obtained revealed a perfect discrimination between the different apple varieties, with Rijo apple juices as samples with the major relative concentration of ethanol, Et butanoate, Et 2-methylbutanoate and Et hexanoate. Moreover, this study allowed a geog. origin-based classification of Azedo apple juices, highlighting Et acetate, 2-methyl-1-propanol, Et hexanoate, and toluene (described for the first time in apple juices) as discriminatory features. This study demonstrated that volatile organic compounds (VOCs) could serve as authenticity indicators to verify variety and geog. origin of apple juices, providing local producers multiple benefits and legal protection against misuse of the products. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5Electric Literature of C6H12O2).
Methyl2-methylbutyrate (cas: 868-57-5) belongs to esters. Volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Electric Literature of C6H12O2
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics