scholarly journals Aza-Michael Mono-addition Using Acidic Alumina under Solventless Conditions

Molecules ◽  
2016 ◽  
Vol 21 (6) ◽  
pp. 815 ◽  
Author(s):  
Giovanna Bosica ◽  
Roderick Abdilla
Keyword(s):  
Acidic Alumina

Estimation of Butylated Hydroxyanisole and Butylated Hydroxytoluene in Meat Products

1974 ◽  
Vol 57 (4) ◽  
pp. 804-805
Author(s):  
Joginder Singh ◽  
Michel R Lapointe
Keyword(s):  
Ball Mill ◽  
Meat Products ◽  
Butylated Hydroxytoluene ◽  
Butylated Hydroxyanisole ◽  
Ionization Detector ◽  
Direct Extraction ◽  
Qualitative And Quantitative ◽  
Flame Ionization ◽  
Acidic Alumina

Abstract A procedure is described for the estimation of butylated hydroxyanisole and butylated hydroxytoluene in meat products. It involves direct extraction of the antioxidants from the meat products by using acetonitrile as the solvent in a steel ball mill. Cleanup is carried out on a column of deactivated acidic alumina. Gas chromatography with a flame ionization detector is used for qualitative and quantitative determination of the antioxidants. Average recoveries of antioxidants added to 10 g samples of corned beef and sausages ranged from 61 to 90%.

Characterization of some chemically modified acidic alumina T samples for TLC

2004 ◽  
Vol 17 (100) ◽  
pp. 424-430
Author(s):  
Miuţa Filip ◽  
Virginia Coman ◽  
Rodica Grecu ◽  
Klaus Albert ◽  
Zaharie Moldovan
Keyword(s):  
Chemically Modified ◽  
Acidic Alumina

Fast Screening Method for Detection of Aflatoxin Contamination in Cottonseed Products

1972 ◽  
Vol 55 (5) ◽  
pp. 1114-1119 ◽  
Author(s):  
Alva F Cucullu ◽  
Walter A Pons ◽  
Leo A Goldblatt
Keyword(s):  
Detection Method ◽  
Screening Method ◽  
Aflatoxin Contamination ◽  
Contamination Level ◽  
Fluorescent Band ◽  
Total Analysis Time ◽  
Fast Screening ◽  
Total Analysis ◽  
Acidic Alumina ◽  
Benzene Extract

Abstract The detection method incorporates a 3 min blender extraction of the sample with aqueous acetonitrile, followed by partition of aflatoxins from an aliquot of the extract into benzene to effect a 4-fold concentration of the aflatoxins. A millicolumn (4 mm id × 20 cm long) filled with zones of acidic alumina (1.5 cm) and silica gel (9 cm) is placed in a portion of the benzene extract and the column is developed 5 min in chloroform-acetonitrile-2-propanol. Aflatoxins are detected by the presence of a sharp blue fluorescent band about 1 cm above the alumina zone when the developed column is examined under longwave ultraviolet light. Total analysis time is 15 min, and sensitivity of the method is in the range of 10–20 μg total aflatoxins (B1 + B2)/kg. An indication of the approximate contamination level can be obtained from the intensity of the fluorescent aflatoxin band.

Solvent-free Dehydration of Alcohols using LiCl-acidic Alumina

2012 ◽  
Vol 28 (3) ◽  
pp. 1141-1145
Author(s):  
G. BAGHERI MARANDI ◽  
A. POURJAVADI ◽  
H. HOSSEINZADEH
Keyword(s):  
Solvent Free ◽  
Acidic Alumina

Microwave-assisted solvent-free synthesis and luminescence properties of 2-substituted-4,5-di(2-furyl)-1H-imidazoles

2015 ◽  
Vol 69 (2) ◽  
Author(s):  
Jian Zhang ◽  
Tian-Qi Zhao ◽  
Yao Chen ◽  
Xiao-Dong Chen ◽  
Hai-Kun Chang ◽  
...  
Keyword(s):  
Ammonium Acetate ◽  
Solvent Free ◽  
Luminescence Properties ◽  
Microwave Assisted ◽  
Ft Ir ◽  
Acidic Alumina ◽  
Solvent Free Synthesis ◽  
Microwave Assisted Method

AbstractA solvent-free microwave-assisted method for the synthesis of 2-substituted-4,5-di(2-furyl)-1H-imidazoles was developed. Imidazoles with moderate to good yields were produced by condensation of furil with aldehydes over acidic alumina impregnated with ammonium acetate, and they were characterized by FT-IR, HRMS,

SYNTHESIS AND CHARACTERIZATION OF MICROPOROUS SILICA-ALUMINA THIN FILMS

2010 ◽  
Vol 09 (06) ◽  
pp. 571-574
Author(s):  
CHERAITIA ABDALLAH ◽  
SATHA HAMID ◽  
AYRAL ANDRÉ
Keyword(s):  
Thin Films ◽  
Mixed Oxide ◽  
Sol Gel ◽  
Dip Coating ◽  
Microporous Silica ◽  
Molar Ratios ◽  
Spectroscopic Analyses ◽  
Silica Alumina ◽  
Acidic Alumina

Microporous silica-alumina thin films were prepared by a simple and robust sol-gel method. Tetraethoxysilane was mixed with an acidic alumina hydrosol. Urea was added for the preparation of the alumina hydrosol, for controlling the polycondensation of the mixed oxide network and also as porogen agent. Thin films were deposited by dip-coating on dense substrates. IR and 27 Al NMR spectroscopic analyses showed that for Si/Al molar ratios up to 6/1, a homogeneous mixed oxide is obtained with a random distribution of Al and Si atoms in the oxide lattice based on tetrahedral units. The deposited layers are crack-free as demonstrated by scanning electron microscopy (SEM) observations. Their microporosity was investigated using ellipsoporosimetry (EP) with films supported on flat substrates.

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