(THF) was purchased from Merck and used without further purification.
The obtained sample was transferred to a 15 mL Falcon tube to which 4 mL ethanol and 2 mL tetrahydrofurane
Statistical Analysis System; THF, tetrahydrofurane
; TNF[alpha], tumor necrosis factor alpha.
The extracts were then dried under nitrogen, resuspended with a mixture of acetonitri1e : methanol : tetrahydrofurane
(58.5:35:6.5, vol:vol:vol), and analyzed with the same solvent  by a HPLC Supelco Supelcosil LC18 column (0.46 x 25 cm) (Bellefonte, PA), at a flow rate of 2.5 mL [min.sup.-1].
(THF) as the solvent, the extraction time was decreased four-fold while the fraction extracted was increased thrice at room temperature by using ultrasounds under 20 kHz frequency.
Sodium diphenyl amino-4-sulfonate (>99%; Sigma-Aldrich), ammonium persulfate (98%; Sigma-Aldrich), sodium hydroxide (Fluka), sodium sulfate (Merck), hydrochloric acid (37%; Merck), ammonium hydroxide (Sigma-Aldrich), analytical grade ethanol (Merck), tetrahydrofurane
(Merck), and diethyl ether (Merck) were used in synthesis of the polymers.
When dielectric constant of the co-solvents evaluated in this work, i.e., ethylacetate and tert-Butanol, is compared with the dielectric constant of co-solvents used in different works, i.e., dimethyl ether, iso-propylether, tetrahydrofurane
, hexane and toluene (Guan et al., 2009; Liu et al., 2007; Royon et al., 2007), it is observed that the closer value of the dielectric co-solvent constant to the dielectric constant of the oil or the dielectric constant of the alcohol tends to decrease the methyl ester yields.
The effect of the tetrasubstitution of zinc Pcs on their photophysical and photochemical properties will be evaluated in dimethylsulfoxide (DMSO), dimethylformamide (DMF), and tetrahydrofurane
on a long term cooperation for the development and manufacturing of catalysts for making BDO (1,4-butanediol), THE (tetrahydrofurane
) and GBL (gamma--butyrolactone) from biobased succinic acid.
Indeed, the prepared copolymers are insoluble in dichloromethane, ethanol, tetrahydrofurane
but they can dissolve in dimethylformamide.
Nova-pak C18 column with a particle size of 5 [micro]m (Waters, Millipore, Milford, MA, USA) using 50 mM sodium acetate (pH 6.8), methanol and tetrahydrofurane
as mobile phase (A, 82:17:1; B, 22:77:1) at a flow-rate of 1.0 ml/min.
Dithizone, Merck (Darmstadt, Germany), 1 x [10.sup.-3] mol [L.sup.-1] solution was prepared by dissolving an appropriate amount in tetrahydrofurane
, Merck (Darmstadt, Germany).