The results showed variations in extraction yield and composition.
Thus, data concerning the extraction and polyphenolic composition from Hypericum triquetrifolium Turra, a plant with pharmacological potency [2, 3], are very scarce.
These later explanations believe that resource windfalls have a detrimental impact on government behaviors such as the time horizons of policy makers, institutional development, methods of government-revenue extraction, and the composition of government expenditures (Collier and Hoeffler 2004, 2005; Mehlum et al. 2006; Moore 2001, 2004; Torvik 2009).
Samples were divided equally for RNA extraction and ion composition analysis.
Matrix polysaccharide content was determined gravimetrically based on a TFA extraction and its composition was expressed as mol%.
The best extraction conditions for a majority of the anthocyanin peaks were 2.5 g of sample, 99 °C (at 50 bar), 7 min of extraction and a solvent composition of water/ethanol/formic acid (94/5/1, v/v/v).
To achieve the best extraction conditions, the organic membrane composition and stirring rate were optimized separately by one-variable-at-a-time (OVAT) methodology, and the other effective parameters, including extraction time, applied voltage and composition of acceptor/donor phases, were studied by application of response surface methodology (RS M.
The approach was applied to evaluate the impact of several extraction conditions (solvent nature and composition, time and temperature of the treatment, amount of sample, and time and temperature of conservation of the extracts) on the number of significant peaks found in the fingerprints of a medicinal herb (a green tea sample), using Plackett Burman designs.
Due to the fact that metabolites differ greatly in their concentrations, structures, and chemical behaviors, extraction buffer composition, temperature, and period of extraction must all be optimized.
"Feature extraction for art paintings" section describes the proposed feature extraction method, including color features and composition features.
The extraction conditions such as extractant mixture composition, extraction time and extractions number, were optimized and the need of an extract freezing step previous to SPME is discussed.
