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Annotated GLC/FID traces of the six Daphnandra species run on polar glc columns, a, D. tenuipes; b, D. apatela; c, D. repandula (type 1); d, D. repandula (type 2); e, D. johnsonii; f, D. micrantha; g, D. melasamena.
Source publication
As part of an investigation of the more primitive plant families in Australia the chemical profile of the essential oils from leaves of the six species of the Australian genus Daphnandra have been characterized. Daphnandra apetala gave a sesquiterpenic oil, with β-caryophyllene (9–19%), germacrene-D (15–20%) and bicyclogermacrene (9–12%) constituti...
Contexts in source publication
Context 1
... possible, two individual samples and a bulk sam- ple of an additional three individuals were collected. The The leaf oils of D. repandula, though principally sesqui- terpenic, did present two different types of oils; type 1 in which α-, β-and γ-eudesmol were present ( Figure 1c) and type 2 (Figure 1d), in which they were absent (see Table 1). The percentage of α-pinene present in the oils also varied in these two types. ...
Context 2
... possible, two individual samples and a bulk sam- ple of an additional three individuals were collected. The The leaf oils of D. repandula, though principally sesqui- terpenic, did present two different types of oils; type 1 in which α-, β-and γ-eudesmol were present ( Figure 1c) and type 2 (Figure 1d), in which they were absent (see Table 1). The percentage of α-pinene present in the oils also varied in these two types. ...
Context 3
... oil yield (w/w, fresh weight) was 0.1-0.2%. The second type of oil (Figure 1d) contained β-caryophyllene (12-13%), bicyclogermacrene (22-25%), germacrene-D (8-10%) as its major components and globulol (2-4%), spathulenol (5-7%), caryophyllene oxide (1-2%) and γ-, α- and β-eudesmol (1-2%, 4-5%, 2-5%, respectively) as other components. The principal monoterpene was α-pinene (3-4%), with no other monoterpene being greater than 0.4%. ...
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... johnsonii gave a leaf oil that contained both mono-and sesquiterpenes, though monoterpenes predominated (Table 1, Figure 1e). The principal mono- terpenes identified were α-pinene (31.7%) and camphene (18.6%). ...
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... leaf oil obtained from Daphnandra micrantha was composed mainly of sesquiterpenes (Table 1, Figure 1f). The principal components were cubebol (7.4%), spathule- nol (8.3%) and germacrene-D (6.8%). ...
Context 6
... 1 lists the compounds identified in the leaf essential oils of the various species in the genus Daphnandra. Figure 1 shows representative annotated GLC/FID traces (on a polar column) for the oils listed in Table 1. ...
Context 7
... oil obtained from Daphnandra tenuipes pre- sented a complicated mixture of sesquiterpenes (Table 1, Figure 1a). The principal identified components were ger- macrene-D (16-21%) and germacrene-B (2-10%). ...
Context 8
... apatela gave a largely sesquiterpenoid pro- file in its leaf oil (Table 1, Figure 1b). The principal com- ponents were β-caryophyllene (9-19%), germacrene-D (15-20%) and bicyclogermacrene (9-12%). ...
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Citations
... indicating that these volatiles contributed to the freshness quality of green tea. However, the levels of 1-decanol, 2-hexyl-(flowery), pentadecane, 3-methyl-(alkane), and shyobunol (pungent) were higher in samples at 35 • C than that at 5 • C. Cubebol was reported to be major volatile in the leaves of the genus Daphnandra (Atherospermataceae) (Brophy et al., 2016). The compound benzyl nitrile, derived from glucosinolate precursors (Zhou et al., 2019), is considered a potential primary contributor to fragrant floral aroma found in oolong teas (Wang, Liu et al., 2010). ...
Green tea is renowned for its exceptional freshness; nevertheless, preserving its freshness poses a formidable challenge during storage due to its susceptibility to environmental factors. However, the effect of storage factors on freshness quality of green tea remains unclear, particularly with a lack of research studies regarding aroma quality and associated volatiles. In this study, we investigated the effects of oxygen scavenger, temperature, and packaging materials on freshness quality of packaged green teas during storage. The sensory freshness and corresponding volatile metabolites of the samples were investigated; the sensory‐chemical changes among packaged green teas during storage under different treatments were further explored. The freshness preservation in packaged green teas can be effectively achieved through the implementation of low‐temperature storage, packaging with oxygen scavenger and utilizing packaging with minimal oxygen permeability. A total of 151 volatile compounds were detected in all samples, among which 104 volatiles were identified as key contributors for distinguishing sample groups under 3 different treatments. The presence of volatiles with green, spicy, minty, and vegetable notes was found to be positively correlated with high freshness quality observed in packaged green tea. Conversely, an increase in volatiles characterized by fruity, sweet, fatty, and alkane notes was associated with the freshness deterioration. The volatiles changes that lead to freshness deterioration occurred especially under conditions of elevated temperature and increased oxygen levels, predominantly involving fat degradation, lipid oxidation, the Maillard reaction, carotenoids degradation, and dehydration reactions. The findings provide a theoretical foundation for the advancement of storage technology in packaged green teas.
E)-β-caryophyllene (BCP) is a natural sesquiterpene hydrocarbon present in hundreds of plant species. BCP possesses several important pharmacological activities, ranging from pain treatment to neurological and metabolic disorders. These are mainly due to its ability to interact with the cannabinoid receptor 2 (CB2) and the complete lack of interaction with the brain CB1. A systematic analysis of plant species with essential oils containing a BCP percentage > 10% provided almost 300 entries with species belonging to 51 families. The essential oils were found to be extracted from 13 plant parts and samples originated from 56 countries worldwide. Statistical analyses included the evaluation of variability in BCP% and yield% as well as the statistical linkage between families, plant parts and countries of origin by cluster analysis. Identified species were also grouped according to their presence in the Belfrit list. The survey evidences the importance of essential oil yield evaluation in support of the chemical analysis. The results provide a comprehensive picture of the species with the highest BCP and yield percentages.
