A review with 57 refs. [on SciFinder(R)]
N Garti, WELLNER, E, Aserin, A, and SARIG, S. 1983.
“Analysis Of Sorbitan Fatty Acid Esters By Hplc.”. Jaocs, J. Am. Oil Chem. Soc., 60, 6, Pp. 1151–1154.
Sorbitan esters of several fatty acids were analyzed by high-pressure liq. chromatog. (HPLC) using an Lichrosorb RP-18 column (25 cm × 4.6 mm). No derivatization was necessary. Mono-, di- and trisorbitan esters of palmitic, stearic, oleic, isostearic, and sesquioleic acid were sepd. using iso-PrOH-water (85:15, 80:20, or 92:8) as the elution mixt. [on SciFinder(R)]
Brominated Span 80, brominated Tween 80, brominated oleic acid, and brominated linoleic acid function as emulsifiers and weighting agents in castor oil-in-water emulsions and increase the sp. gr. of oil droplets. Stable emulsions are obtained at appropriate concns. of emulsifiers, and downward creaming (sedimentation) occurs when larger concns. of weighting agents-emulsifier are used. The efficiency of the weighting agent-emulsifier depends on the sp. gr., HLB value, and water soly. Brominated oleic and linoleic acids (in presence of triethanolamine) are the most efficient because they are hydrotropic and are adsorbed in the oil-water interface or dissolved in the oil. [on SciFinder(R)]
James F Outlaw Jr., Cozort, James Ray , Garti, Nissim , and Siegel, Samuel. . 1983.
“Dienes As Possible Intermediates In The Catalytic Hydrogenation Of Aromatic Hydrocarbons. 1. Dienes Derived From 1,4-Di-Tert-Butylbenzene And A Rhodium Catalyst.”. Journal Of Organic Chemistry, 48, 23, Pp. 4186–4190. doi:10.1021/jo00171a006.
Product evolution upon hydrogenating 3 diene derivs. of p-(Me3C)2C6H4 (I) is compared with the formation of 1,4-di-tert-butylcyclohexene (II) and cis- (III) and trans-1,4-di-tert-butylcyclohexane from I on a Rh/Al2O3 catalyst to det. which diene(s), upon adsorption on the catalyst, best represent(s) the structure of the intermediate formed in the rate-detg. surface reaction of I. Of the dienes 1,4-di-tert-butyl-1,4- (IV) and -1,3- (V) and 2,5-di-tert-butyl-1,3-cyclohexadiene (VI), VI exhibits best the properties expected if it forms the same absorbed intermediate as I at the same H pressure. Unlike I, however, the dienes do not yield the cis-satd. isomer III as an initial product at low H pressures. Instead cis-3,6-di-tert-butylcyclohexene (VII) is formed, along with II and I; the dienes tend to exclude the cycloalkenes from the catalyst, their effectiveness increasing in the order IV \textless V \textless VI. At low pressures, \textless5% of I is transformed directly to III; instead, II and VII are produced initially. Because the concn. of the intermediate adsorbed dienes remains low during I hydrogenation, the cis ene VIII is converted rapidly to III in the presence of I. [on SciFinder(R)]
JF OUTLAW, COZORT, JR , Garti, N, and SIEGEL, S. 1983.
“Dienes As Possible Intermediates In The Catalytic-Hydrogenation Of Aromatic-Hydrocarbons .1. Dienes Derived From 1,4-Di-Tert-Butylbenzene And A Rhodium Catalyst”. Journal Of Organic Chemistry, 48, 23, Pp. 4186–4190. doi:10.1021/jo00171a006.
S SARIG, Garti, N, AZOURY, R, PERLBERG, S, and WAX, Y. 1983.
“Follow-Up Of Drug Therapy Efficacy To Prevent Recurrence Of Calcium Oxalate Kidney Stone Formation”. The Journal Of Urology, 129, 6, Pp. 1258–1261.
Results of a prospective study of response to phosphate treatment after surgery in a group of kidney stone formers, some of them recurrent are presented. The follow-up, of 1 year duration, was carried out by periodic tests of the stone formers' urine using the Discriminating Index (DI) procedure. In a group of 32 stone formers, 30 individuals showed a remarkable change in the DI value; i.e., the inhibiting potential of their urine was similar to that of normals. Two of the patients did not respond well, and their drug treatment was adjusted accordingly. During this year no recurrency was reported.[on SciFinder (R)]
Reuven Azoury, Randolph, Alan D, Drach, George W, Perlberg, Saul , Garti, Nissim , and Sarig, Sara. . 1983.
“Inhibition Of Calcium Oxalate Crystallization By Glutamic Acid: Different Effects At Low And High Concentrations.”. Journal Of Crystal Growth, 64, 2, Pp. 389–392. doi:10.1016/0022-0248(83)90148-3.
The effects of L-aspartic acid, alanine, and L-glutamic acid on the crystn. of Ca oxalate were followed by 2 methods. Glutamic acid (0-200 ppm) was added to solns. of CaCl2 which were subsequently mixed with solns. of Na2C2O4 to yield CaC2O4 pptn. At relatively high concns. of glutamic acid (20-200 ppm), the pptn. of Ca oxalate is retarded. However, at low concns., 2.5-20 ppm, oxalate pptn. is enhanced. The 2 independent methods yield well-correlated results. Both L-aspartic acid and alanine did not affect the pptn. of Ca oxalate. The results are discussed with respect to renal calculi formation. [on SciFinder(R)]
The effects of reactant ratio and reaction conditions on the compn. of the products are detd. for the esterification of maleic anhydride and monoglycerides of satd. fatty acids. The concn. of monoesters is higher in products prepd. in a closed reactor, compared with products compared in an open reactor. The compn. of the reaction product is varied as desired by appropriate selection of the temp., reaction time, and ratio of reactants. [on SciFinder(R)]
Inversion of multiple W/O/W emulsions into O/W systems was studied as a function of the HLB of the external emulsifier, its concn., and droplet size. Inversion occurs only when droplet size is reduced under crit. size or if the HLB of the total emulsifiers present in the system (weighted HLB) approaches the required HLB of the oil phase. Inversion is independent of the HLB of the external emulsifier by itself (apparent HLB). [on SciFinder(R)]