The AsPLs, however, showed a clear preference for the DCM/methanol mixture which was the most efficient solvent in all cases: the other seven solvent mixtures showed efficiencies of 35 80% relative to DCM/methanol.
Of all the solvent systems tested, ethanol proved to be the most efficient solvent for zerumbone extraction (Table 1).
Therefore it is very important to develop the most efficient solvent with high thermal and chemical stability.
Among the pure solvents, methanol was the most efficient solvent for extraction of antioxidant compounds, followed by water, ethanol and acetone ( see Additional files 1 and 2).
PEG-200 was the most efficient solvent and in combination with DABCO, the medium can be recycled upto three more runs.
Our preliminary study showed that the solvent mixture containing hexane and isopropanol (60 40) was the most efficient solvent for defatting process among all studied solvents (i.e. petroleum ether, hexane, isopropanol and ethanol).
Preliminary trials showed that the solvent mixture containing hexane and isopropanol (60 40) was the most efficient solvent for defatting process among all studied solvents (i.e. petroleum ether, hexane, isopropanol and ethanol).
Thus, it still remains unclear as to what the most efficient solvent system would be for the extraction of free and bound phenolic compounds from litchi pulp.
All eight solvent mixtures showed comparable ability to extract the AsHCs giving values of 80 95% of that obtained for the most efficient solvent mixture (DCM/methanol for AsHC332 and toluene/methanol for AsHC360).
The most efficient mixed solvent consists of water, dimethyl formamide (DMF) and aniline in volume ratio of 20 10 1, and the delignified sample was analyzed to contain 0.87% lignin.
