Abstract Oleic, linoleic and linolenic acids were autoxidized more rapidly than their corresponding methyl esters. Addition of stearic acid accelerated the rate autoxidation linoleate decomposition hydroperoxides. Therefore, higher oxidative FFA's esters could be due to catalytic effect carboxyl groups on formation free radicals by also soybean oil. This result suggests that particular attention should paid FFA content affects stability oils.

Abstract A method for the stereospecific analysis of triacyl‐ sn ‐glycerols by high‐performance liquid chromatography (HPLC) on a chiral column is described. Triacyl‐ were partially degraded with ethyl magnesium bromide, and monoacylglycerols produced separated as 1‐ 2‐monoacylglycerol fractions thin‐layer boric acid‐impregnated silica gel plates. The 1‐monoacylglycerols resolved into ‐1 ‐3 monoacylglycerol HPLC (Sumichiral OA‐4100) after derivatization 3,5‐dinitrophenyl isocyanate. Fatty...

Abstract Open‐tubular gas chromatographic analysis of fatty acids in the lipids from seeds 20 species Gymnospermae showed that they all contained nonmethylene‐interrupted polyenoic (NMIP) as minor components and palmitic, oleic, linoleic α‐linolenic major components. The NMIP have an additional 5,6‐ethylenic bond ordinary plant unsaturated following C 2 elongation acids: cis ‐5, ‐9‐octadecadienoic acid (5,9–18∶2) (I); 5,9,12–18∶3 (II); 5,9,12,15–18∶4, 5,11–20∶2, 5,11,14–20∶3 (III);...

Abstract Analytical methods to obtain the detailed compositions of fatty acids in oils containing more than one conjugated octadecatrienoic acid by open‐tubular gas liquid chromatography (GLC) and reversed‐phase high performance (HPLC) were established. Effective GLC separations cis,trans,trans ‐9,11,13‐octadecatrienoic ( ctt ‐9,11,13–18∶3), ctc ‐9,11,13–18∶3, ttc ttt ‐8,10,12–18∶3, ‐8,10,12–18∶3 obtained with an opentubular column coated nonpolar phase OV‐1 using instrument having all‐glass...

Abstract Improved procedures of the Swoboda and Lea method for determination peroxide values (POV) fats lipids are presented. After oxidation iodide to iodine with sample 5 min under an inert atmosphere, excess ion is immediately converted cadmium complex protection from atmospheric oxygen. The measured colorimetrically at 358 or 410 nm, POV calculated absorbance. This permits rapid a small amount moderate cost using usual glasswares. For analysis in biological materials food products,...

Lipid classes and fatty acid details of sea urchins Strongylocentrotus droebachiensis harvested in subtidal water near Halifax, deep St. Margaret's Bay, were compared. All samples contained an eicosenoic with 5,6-ethylenic unsaturation two non-methylene-interrupted eicosadienoic acids (NMID) the one 5,6 bond a second either 11,12 or 13,14 positions. Structures identified by combinations ozonolysis, partial hydrazine reduction argentation-TLC mass spectra pyrrolidine derivatives. No...

The refractive index has been determined from a reflectance measurement between photon energies of 0.5 and 1.4 eV at room temperature for Ga1-xInxAs samples with x<0.5 prepared by vapor-phase epitaxy. Dispersion characteristics the below bandgap is analyzed on basis single-oscillator model two parameters, Eo Ed. It seems that both Ed vary linearly x GaAs InAs.

Abstract Background Recently, the occurrence of peri‐implantitis has been increasing. However, a suitable method to debride contaminated surface titanium implants not established. The aim this study was investigate morphologic changes microstructured fixture after erbium laser irradiation, and clarify effects lasers when used remove calcified deposits from implant surfaces. Methods In experiment 1, sandblasted, large grit, acid etched were treated with Er:YAG or Er,Cr:YSGG at 30 60 mJ/pulse...

Stereospecific analysis of fish oil triacyl‐ sn ‐glycerols was carried out by novel high‐performance liquid chromatography on a chiral stationary phase. The positional distributions fatty acids were determined without accumulation errors in particular position and preferential hydrolysis for acid. High‐resolution gas‐liquid an open tubular column detailed the distribution unsaturated acid isomers having olefinic bonds different positions. not independent other acids. long‐chain highly...

Chiral phase high performance liquid chromatographic resolution of sn-1,2(2,3)- and X-1,3-diacylglycerols generated by partial Grignard degradation from natural triacylglycerols was carried out using a chiral column (25 cm x 4.6 mm i.d.) containing (R)-(+)-1-(1-napthyl)ethylamine polymer chemically bonded to 300A wide pore spherical silica (5 microns particles). The diacylglycerols were chromatographed as 3,5-dinitrophenyl-urethanes detected at 226 or 254 nm UV. By an isocratic elution with...

Abstract Open tubular gas liquid chromatographic (GLC) analyses of fatty acids from total lipids 12 species Echinoidea collected at several locations along the Pacific coast Japan showed same unusual cis ‐5‐olefinic in all species, i.e., ‐5‐octadecenoic acid (5–18∶1), ‐5‐eicosenoic (5–20∶1), all‐ ‐5,11‐ and 5,13‐eicosadienoic (5,11‐ 5,13–20∶2), ‐5,11,14‐eicosatrienoic (5,11,14–20∶3) ‐5,11,14,17‐eicosatetraenoic (5,11,14,17–20∶4). The structural analysis partially purified 5,11,14,17–20∶4 was...

Abstract High performance liquid chromatographic separation of monoacylglycerol enantiomers as di‐3,5‐dinitrophenylurethane derivatives was carried out on a chiral stationary phase, N‐( S )‐2‐(4‐chlorophenyl)isovaleroyl‐D‐phenylglycine chemically bonded to v ‐aminopropyl silanized silica. Complete the urethane racemic monoacylglycerols with saturated acyl groups C 12 −C 18 achieved using stainless steel column (25 cm long) packed 5μ particles, an isocratic elution at ambient temperature...

Abstract The fatty acid compositions of lipids from two species Crinoidea and Ophiuroidea have been investigated with open‐tubular gas chromatography. About 5–10% tetracosahexaenoic was found in total acids all the samples, structure determined as all‐ cis ‐6,9,12,15,18,21‐tetracosahexaenoic [24∶6(n−3)] by 13 C‐NMR methyl esters mass spectrometric analyses esters, pyrrolidides ozonolysis products. 24∶6(n−3) concentrated polar rather than neutral lipids. n−3 hexaenoic suggested chain...

Open-tubular gas chromatographic analysis was carried out on fatty acids from the total lipids each of 3 species Chlorophyta (I), and Rhodophyta (II), 6 speices Phaeophyta (III). The specific features polyenoic in class were relatively high percentages 16 : (n-3) (2.27.8%) 4 (16.217.7%) I, 20 (n-6) (60%) or 5 (51%) II, one more 18 (n-3), (n-6), III. percentage Garcilaria verrucosa noticeably as 60% acids, 91% acids. algae belong to II are expected be source for (n-3). 1 (n-7) /18 (n-9)...

Abstract Eicosatrienoic acid, the unique constituent acid of Podocarpus nagi seed oil is characterized as all‐ cis ‐5,ll,14‐eicosatrienoic acid. Bicosadienoic found in same shown to be cis,cis ‐11,14‐eicosadienoic

The Er:YAG laser is currently used for bone ablation. However, the effect of irradiation on healing remains unclear. aim this study was to investigate following ablation by as compared with bur drilling. Rat calvarial ablated using or water coolant. effectively without major thermal changes. In vivo micro‐computed tomography analysis revealed that showed significantly higher repair ratios than Scanning electron microscope more fibrin deposition laser‐ablated surfaces. Microarray followed...

Quantification of free and bound carotenoids in pigmented fruit vegetable matrices has previously been challenging due to carotenoid instability, degradation during extraction, the prevalence predominant esters. The aim present study was develop an optimized extraction procedure that minimises loss by utilising a combination solutions, followed improved saponification process. A mixture hexane, dichloromethane, ethanol water achieved highest efficiency (&gt;97%) from chili/capsicum matrix....

Mango (Mangifera indica L.) cultivars display a wide range of ripe flesh colours, from deep-orange to pale-yellow, largely linked differences in carotenoid profiles. This study examined the relationship between profile and colour across 25 mango cultivars. Flesh was measured using chroma (intensity) hue angle (colour) correlated with content quantified ultra-high performance liquid chromatography diode-array detection (UHPLC-DAD). Chroma displayed second-order inverse polynomial increasing...

Rapid and practical separations of 1,2- 2,3-diacyl- dialkyl-sn-glycerol enantiomers as their 3,5-dinitrophenyl-urethane derivatives were carried out by normal-phase high performance liquid chromatography on a chiral stationary phase, N-(R)-1-(alpha-naphthyl)ethylaminocarbonyl-(S)-valine chemically bonded to gamma-aminopropyl silanized silica. Complete the racemates into achieved for both diacyl- dialkylglycerols within 10 min using stainless steel column (25 cm long) packed with 5-mu...