نتایج جستجو برای: acetone and ethanol
تعداد نتایج: 16838268 فیلتر نتایج به سال:
the effect of soxhlet and simple immersion extraction methods on the amount and type of bioactive phenolic compounds of c. arizonica woodknots were studied. lipophilic and hydrophilic compounds were soxhlet extracted according to t280 pm-99 standard method with hexane and acetone solvents, respectively. also, in the immersion method woodknot samples were dipped in hexane to remove the lipophil...
Geometrically scaled PS-based structures were fabricated in order to develop gas sensing devices by exploring porous silicon (PS) electrical characteristics. The electrical behavior of PS devices respond to polar organic vapors (as acetone and ethanol) reversibly in a reproducible way. Devices were fabricated with three different perimeters, maintaining a constant area (5.76 mm) and constant PS...
Guayule (Parthenium argentatum) a shrub native to Mexico, is now being acclimated in Europe as a potential crop. The main extractible fractions are polyisoprene (similar to Hevea rubber) for producing tires and allergy-free gloves and resin (GRe). This work deals with valorising this last fraction, after water-based extraction of the latex. To date GRe has not been extensively investigated, in ...
in this thesis, a better reaction conditions for the synthesis of spirobarbiturates catalyzed by task-specific ionic liquid (2-hydroxy-n-(2-hydroxyethyl)-n,n-dimethylethanaminium formate), calcium hypochlorite ca(ocl)2 or n-bromosuccinimide (nbs) in the presence of water at room temperature by ultrasonic technique is provided. the design and synthesis of spirocycles is a challenging task becaus...
asymmetric polyethersulfone (pes) microfiltration flat sheet membranes were composed by the phase inversion method (pim) and were used as supports. composite membranes were fabricated by coating silicone rubber as selective layer. effect of different concentrations of pes and pdms and different solvent such as nmp, dmf and dms effects as pes solvents and support thickness and different coagulat...
State markers of alcoholism can be divided into (1) the indicators connected directly to ethanol metabolism and the substances involved in or by ethanol metabolism, and (2) the indicators that are not associated with actual blood alcohol concentrations, such as GGT, CDT, or MCV. Methanol, acetone, and isopropanol belong to the first group. These substances were detected and proposed as alcoholi...
Undoped TiO(2) and TiO(2) nanoparticles doped with 1-5 at.% Nb were successfully produced in a single step by flame spray pyrolysis (FSP). The phase and crystallite size were analyzed by XRD. The BET surface area (SSA(BET)) of the nanoparticles was measured by nitrogen adsorption. The trend of SSA(BET) on the doping samples increased and the BET equivalent particle diameter (d(BET)) (rutile) in...
BACKGROUND Radix Scutellariae, a few papers reported its pharmacology activities including alleviate small intestines smooth muscles spasm, sedation, antihypertensive effect. However, the inhibition of its different organic extracts on immediate hypersensitivity has not bee researched. MATERIALS AND METHODS To investigate the anti-immediate hypersensitivity of three extracts including ethanol...
Pitaya is a tropical and subtropical plant with various uses. In this study, the maceration method obtained acetone, ethanol, ethyl acetate, dichloromethane, methanol from bark parts of pitaya fruit. The in vitro effects fruit peel extracts on critical metabolic enzyme activities acetylcholinesterase (AChE), butyrylcholinesterase (BChE), human carbonic anhydrase (hCA I hCA II), α-glycosidase, w...
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