Studies on the thermal dehydration of FeC4H4O6 · 2.5H2O and its molecular structure from infrared spectral data
作者:Manoj C. Patel、Arabinda Ray、A. Venkataraman
DOI:10.1016/s0022-3697(96)00182-5
日期:1997.5
compute kinetic parameters from TG studies of FeC4H4O6 · 2.5H2O. A phase boundary reaction mechanism is proposed for the dehydration of the tartrate. The results from dc electrical conductivity have been used to supplement the thermal data. Kinetic parameters are also evaluated employing DTG/DTA technique. Infrared and magnetic susceptibility data are employed to propose the molecular structure of the
Provided is a polyphenol composition derived from
Camellia sinensis
and having reduced harshness. The polyphenol composition according to the invention is derived from
Camellia sinensis
and contains flavonol aglycones and flavonol glycosides. A weight ratio [(B)/(A)] of the following total contents (B) to (A) is from 0.01 to 18:
(A) total content of the flavonol aglycones contained in solids of the polyphenol composition after hydrolysis as measured by high-performance liquid chromatography, and
(B) total content of the polyphenols contained in solids of the polyphenol composition as measured by the ferrous tartrate method.