A New Inositol Glycoside, 2-O-β-l-Arabinopyranosyl-myo-inositol, as a Major Tea Component

The First Naturally Occurring 3-Octulose,d-Gluco-l-glycero-3-octulose, as the Main Constituent ofLaurus nobilisFlush

“…4 ) The 13C_ NMR spectral and optical rotational data of 2 coincided well with those of this synthetic This report is, to our knowledge, the first one on the isolation of naturally occurring 3-octulose (1). Only two kinds of octuloses have been isolated so far, each being 2-octuloses: D-glycero-L-galacto-2-octulose from Persea gratissima,5) Primula ojJicinalis 5 ) and Cannabis sativa, 6) and D-glycero-D-manno-2-octulose from P. gratissima 5 ) and Sedum spectabile, 5) and Fabiana imbricata.…”

“…The extract was filtered or centrifuged to give a clear extract, which was subjected to 13C_ NMR measurement in the same manner as previously reported. 1 ) The spectra of several plant extracts were unexpectedly very characteristic and interesting. 3 ) Especially the spectrum of the laurel Laurus nobilis seemed to be that of a nearly pure compound (Fig.…”

“…In the course of our new application of 13C-NMR spectroscopy to the instant classification and evaluation of tea, we discovered a new inositol glycoside, 2-0-p-(L-arabinopyranosyl)-myo-inositol, amounting about 0,8% of made tea (Japanese green tea, black tea, etc,), 1,2) The inositol glycoside was also found in a hot water extract of the fresh flush of Camellia sasanqua, which is closely related to the tea plant C sinensis var. sinensis, by the characteristic 13C-NMR signals,2) suggesting its physiological importance in carbohydrate metabolism in the genus Camellia.…”

2-O-(β-l-Arabinopyranosyl)-myo-inositol as a Main Constituent of Tea (Camellia sinensis)

“…5 ) Another compound giving previously unidentified signals was tentatively named compound y. 6 ) In this paper we describe the details of the isolation and structural elucidation of this new tea constituent.…”

2-O-(.BETA.-L-arabinopyranosyl)-myo-inositol as a main constituent of tea (Camellia sinensis).

“…6) It is noteworthy that 1 is the first example having a rather unusual axial-axial glycosidic linkage among the inositol glycosides so far…”