Compositional changes of the floral scent volatile emissions from Asian skunk cabbage (Symplocarpus renifolius, Araceae) over flowering sex phases was written by Oguri, Suguru;Sakamaki, Kensuke;Sakamoto, Hikaru;Kubota, Kikue. And the article was included in Phytochemical Analysis in 2019.Recommanded Product: Isopentyl 3-methylbutanoate This article mentions the following:
Introduction : Flowering of the Asian skunk cabbage (Symplocarpus renifolius, Araceae) shows a sequential expression of female, bisexual and male sex phases. The protogynous thermogenic inflorescence has unpleasant odours, but the contributing chem. composition is poorly understood. Objective : To determine the volatile composition of odor emissions from each S. renifolius flowering phase. Methodol. : The dynamic headspace method was used to collect floral volatiles from six intact S. renifolius inflorescences in their natural habitat. Collected volatiles from the three flowering phases were analyzed using gas chromatog.-mass spectrometry/olfactometry (GC-MS/O). Results : Female-phase inflorescences were characterised by an earthy-rotten-minty odor, while male-phase inflorescences typically exhibited a rotten-oily odor. Approx. 160 compounds were detected in volatiles from the three phases. Common to all phases were 3-methylbutyl 3-methylbutanoate, 1,8-cineole, di-Me disulfide and sabinene, together accounting for 52 to 54% of total volatiles. GC-MS/O revealed that at least 28 volatiles including eight S-containing compounds contributed to the unpleasant odor of S. renifolius. Among them, di-Me disulfide (onion-like), methional (potato-like), and the tentatively identified Me dithioformate (garlic-like) were intense odor-active compounds in each floral phase. Addnl., 2-isopropyl-3-methoxypyrazine (IPMP) was a major contributor to the earthy odor that was characteristic of the female phase. Conclusions : No marked changes were observed in floral volatile compositions over the three flowering phases of S. renifolius. Instead, flower phase-dependent proportional changes of minor components (e.g. IPMP and 2,3-butanedione) altered the odor characteristics between the female and male phases. In the experiment, the researchers used many compounds, for example, Isopentyl 3-methylbutanoate (cas: 659-70-1Recommanded Product: Isopentyl 3-methylbutanoate).
Isopentyl 3-methylbutanoate (cas: 659-70-1) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits. 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. Recommanded Product: Isopentyl 3-methylbutanoate
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