Oils, drying fatty, analysis

The amount of mmol product was determined according to nitrogen content of dry fatty amides analyzed by the elemental analysis. The amount of mmol fatty acid in the soybean oil was calculated from mmol of potassium hydroxide required to saponify Ig of soybean oil [10],... 

Composition and Analysis. Naturally occurring drying oils are triglycerides. The reactivity of the oils results fiotn the presence of esters of fatty acids with two or mure nonconjugated double bonds separated by single methylene groups. -CH=CHCHiCH=CH hose with two or more conjugated double bonds. Typical compositions of some of the more important oils are listed in Table I... 

For the structural analysis of cyclic fatty acid derivatives (polymerized drying oils, copolymerization products of fatty oils with various hydrocarbons), in principle the same graphical methods can be developed as have been described for the investigation of hydrocarbon mixtures. However, the construction of useful graphical representations is hampered by the fact that reliable data on physical constants are restricted to the normal saturated fatty acids and their methyl and ethyl esters the synthesis of pure unsaturated fatty acids is already extremely difficult, to say nothing of more complicated cyclic or branched compounds. 

Jojoba (Simmondsia chincnsis) This is not actually an oil but a liquid wax. It is good for cosmetic use with moisturizing properties and ideal for dry skin and conditions like eczema and psoriasis. It is similar chemically to sebum and able to dissolve it. The oil keeps well owing to a stable molecular structure and analysis shows both saturated and unsaturated fatty acids, with eicosenoic (71%), oleic (14%), stearic (10%) and palmitic (1.5%). The presence of a compound called myristic acid is thought to confer anti-inflammatory properties. 

Further applications involves the analysis of both free fatty acids and fatty acids as constituents of fats, oils, etc. Tallent and Kleiman [173] analysed products from the lipolysis of oils (in addition to acids also mono-, di- and triglycerides). BSA is more suitable than an HMDS-TMCS mixture for the silylation of these compounds as more uniform products are produced. The reaction is carried out in a reaction vial in which 2—3 mg of dry lipolysis products are placed and 0.2-0.3 ml of the silylation agent (BSA—pyridine,... 

Addition of (SCN)2 to unsaturated acids has a place in the analysis of fats and drying oils. Whereas iodine adds to all C=C bonds, (SCN)2 is only partially added. From the differences between iodine numbers and thiocyanate numbers (see page 114) conclusions can be drawn about, e.g., the composition of fatty acid mixtures containing oleic, linoleic, and linolenic acid. For details of the technique see Kaufmann.785... 

D3725 Fatty Acids in Drying Oils D3760 Standard Test Method for Analysis of Isopropylbenzene (Cumene) by GC... 

Kahlke and Richterich 1965) and plasma lipids of Refsum s (1946) case T. E. (Kahlke 1964 a). Methods and results were identical in both instances although a nuclear resonance spectrum was obtained only in the first case and a complete mass spectrometric analysis only in the second case. Phytanic acid was isolated by preparative gas-liquid chromatography from a mixture of fatty acid methyl esters. Traces of stearic acid were removed as the urea inclusion compound by treatment with a saturated methanolic solution of urea (Cason et al. 1953). After repeated crystallization from acetone at minus 70—80 C and drying under vacuum at minus 10 C, phytanic acid was obtained as a white crystalline powder with a melting point of minus 7—6 C. At room temperature phytanic acid is a colorless, odorless oil. The lack of hydrogen uptake with exhaustive... 

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