24 research outputs found
Volatile components and nutritional qualities of Viscum articulatum Burm.f. parasitic on ancient tea trees
Volatile flavor compounds (VFCs) and nutrients in Viscum articulatum Burm.f. parasitic on ancient tea trees (named TM) were studied in this research by headspace solidâphase microextraction (HSâSPME)/gas chromatographyâmass spectrometry (GCâMS) and conventional methods. Sixtyâsix volatile compounds belonging to different classes were identified by GCâMS. The ketones, alcohols, and aldehydes were the principal aroma groups in TM according to principle component analysis (PCA). The most abundant aroma components in TM included benzaldehyde (9.64%), geranylacetone (7.92%), epoxyâβâionone (7.71%), βâlinalool (7.35%), methyl salicylate (6.96%), and hotrienol (6.14%), significantly higher than CKs (p < .05). The positive PC1 and PC2 in TM were correlated with benzaldehyde, hotrienol, methyl salicylate, and geranylacetone. The mistletoes could be differentiated from CKs due to the difference in aroma compounds. Clean and fresh, woody and nutty odor with minor floral scent was the characteristics of TM. Analysis of the nutritional components showed that contents of polyphenols and catechins in TM were at trace levels, significantly lower than CKs (p < .05). The total contents of polyphenols, amino acids, carbohydrates, and caffeine in TM were significantly lower from the total soluble solids (p < .05), indicating that there were still lots of compounds undetected in TM. The sensory test showed that the taste and aroma in TM can be accepted, which indicates TM could be developed into alternative tea drinks in the future
Asymmetric Reductive Amination with Pinacolborane Catalyzed by Chiral SPINOL Borophosphates
The catalytic asymmetric reductive amination of ketones
with pinacolborane
employing chiral SPINOL-derived borophosphates as catalysts has been
realized. A series of chiral amine derivatives bearing multiple functional
groups were obtained in good to excellent yields and enantioselectivities
(up to 97% yield, 98% ee) under mild reaction conditions. Moreover,
the synthetic applicability of the established method has been demonstrated
by the asymmetric synthesis of (R)-Fendiline