Factbites
 Where results make sense
About us   |   Why use us?   |   Reviews   |   PR   |   Contact us  

Topic: Triacylglycerols


Related Topics

In the News (Thu 24 Dec 09)

  
  triacylglycerols   (Site not responding. Last check: 2007-09-29)
Triacylglycerol molecules consist of three fatty acid chains attached to a glycerol backbone.
The glycerol molecule has a plane of symmetry and a "stereospecific numbering" (sn) system is used to describe the position of each fatty acid as shown in the figure.
The addition of a third fatty acid results in triacylglycerol which is extremely insoluble and coalesces to form oil droplets.
www.york.ac.uk /org/cnap/oilcrop/cropsind/triacylglycerols.htm   (198 words)

  
 Analysis of triacylglycerols
Triacylglycerols contain three fatty chains which vary in length and degree of unsaturation, thus, forming several molecular species.
An evaluation of the total amount of triacylglycerols in an oil sample can be made by the determination of glycerol as previously described after a saponification step.
The quantification of triacylglycerols is easily made in the µg range after separation by TLC in combination with GLC analysis of fatty acids.
www.cyberlipid.org /ACYLGLYT/acyl0006.htm   (522 words)

  
 Introduction to Lipids   (Site not responding. Last check: 2007-09-29)
Triacylglycerols are used primarily for energy storage in animals.
The processing of glucose to triacylglycerols rather than glycogen, and its reverse, require metabolic energy and one would expect, since energy storage as triacylglycerols is clearly preferred, that there is a major advantage to this form of energy storage.
Moreover, the triacylglycerols are hydrophobic and are stored in nearly anhydrous form by living organisms, while glycogen is hydrophilic; one gram of dry glycogen binds, under physiological conditions, about two grams of water.
www.3rd1000.com /chem301/chem302p.htm   (359 words)

  
 Triacylglycerols (triglycerides - structure, composition, analysis - lipids   (Site not responding. Last check: 2007-09-29)
As was well-known from studies involving hydrolysis with pancreatic lipase, position sn-2 of the triacylglycerols of seed oils is greatly enriched in the polyunsaturated fatty acids (specifically linoleic and linolenic acids), while saturated fatty acids are concentrated in the primary positions, and monoenoic acids are relatively evenly distributed.
With the latter in the liver triacylglycerols, for example, the stearic acid is distributed approximately equally between the three positions, and the oleic acid is present in high concentrations in positions sn-2 and sn-3, thus differing from the depot fats (Table 2).
In the triacylglycerols of Mycobacterium smegmatis, oleic acid is the main component of position sn-1, palmitic acid is the main component of position sn-2, while C18 and longer-chain fatty acids are the principal constituents of position sn-3; indeed 90% of the 24:0 is in position sn-3 [22].
www.lipidlibrary.co.uk /Lipids/TAG   (5731 words)

  
 Dietary Triacylglycerols with Palmitic Acid (16:0) in the 2-Position Increase 16:0 in the 2-Position of Plasma and ...   (Site not responding. Last check: 2007-09-29)
acyl transferase, predominates in the synthesis of triacylglycerols
in the LDL phospholipids, as in the chylomicron triacylglycerols
the LDL cholesteryl esters of piglets fed the synthesized triacylglycerols
www.nutrition.org /cgi/content/full/127/7/1311   (5771 words)

  
 Fatty acid oxidation and ketone bodies
Pancreatic lipase degrades triacylglycerols at the 1 and 3 positions sequentially to generate 1,2-diacylglycerols and 2-acylglycerols.
The triacylglycerol components of VLDLs and chylomicrons are hydrolyzed to free fatty acids and glycerol in the capillaries of adipose tissue and skeletal muscle by the action of lipoprotein lipase.
The blood is the carrier of triacylglycerols in the form of VLDLs and chylomicrons, fatty acids bound to albumin, amino acids, lactate, ketone bodies and glucose.
www.med.unibs.it /~marchesi/fatox.html   (2711 words)

  
 Diabetes: Development of insulin resistance in the JCR:LA... @ HighBeam Research   (Site not responding. Last check: 2007-09-29)
Plasma triacylglycerol concentrations remain at the same level as in lean rats, and neither an elevated muscle triacylglycerol content nor intracellular lipid droplets are found at 4 weeks of age.
The triacylglycerol content of both soleus and gastrocnentius muscle was significantly elevated in cp/cp rats at 4 weeks of age and rose rapidly thereafter.
The accumulation of triacylglycerol within the fibers cannot be explained by increased muscle LPL activity, which was lower in the muscle of cp/cp rats of 1 month of age.
www.highbeam.com /library/doc0.asp?DOCID=1G1:20755172&refid=holomed_1   (6006 words)

  
 Postprandial Triacylglycerols from Dietary Virgin Olive Oil Are Selectively Cleared in Humans -- Abia et al. 129 (12): ...   (Site not responding. Last check: 2007-09-29)
Triacylglycerol concentration in human plasma (A) and in the triacylglycerol-rich lipoprotein (TRL) fraction (B) after the ingestion of the virgin olive oil meal and the control meal after fasting (0 h) and during the 7 h postprandial period.
Percentage of the triacylglycerols present in the triacylglycerol-rich lipoprotein (TRL) fraction and its polarity (expressed as their respective equivalent carbon number, ECN) in humans, plotted as a function of the rate of clearance of the molecular species between 2 and 4 h during the postprandial period (expressed as mmol triacylglycerol/(L · h).
a decrease in the proportion of OOO and an increase in triacylglycerols
www.nutrition.org /cgi/content/full/129/12/2184   (5468 words)

  
 Lipids, lipid analysis, stereospecific analysis of triacylglycerols
For example, as we know the fatty acid composition of the intact triacylglycerols and we have determined that of the 1,2-diacyl-sn-glycerol derivatives, it is simple arithmetic to calculate the composition of position sn-3.
They converted mono- and diacyl-sn-glycerols prepared from triacylglycerols to the 3,5-dinitrophenyl urethane (DNPU) derivatives for resolution by HPLC on columns containing a stationary phase with chiral moieties bonded chemically to a base of silica gel.
Initially, these were isolated by TLC on silica gel impregnated with boric acid, separated into saturated and unsaturated fractions by silver ion chromatography, converted to the dinitrophenylurethane derivatives and then resolved on a chiral column.
www.lipidlibrary.co.uk /topics/stereotg   (1353 words)

  
 Olive Chemistry - The Olive Oil Source
Triacylglycerols (Triglycerides or Fats) are the major energy reserve for plants and animals.
The levels of these acids (present as triacylglycerols) varies during the different maturation stages of the olive, varies with the variety and the growing conditions.
Antioxidants: The flavenoid polyphenols in olive oil are natural anti-oxidants which have been shown to have a host of beneficial effects from healing sunburn to lowering cholesterol, blood pressure, and risk of coronary disease.
www.oliveoilsource.com /olivechemistry.htm   (1392 words)

  
 Fatty acid stucture
Triacylglycerols are highly concentrated stores of energy with the yield for the complete oxidation of fatty acids about 9 kcal/g.
Large globules of triacylglycerols in the adipose cell can take up most of the cytoplasmic space.
Triacylglycerols are stored in a highly hydrated form in adipose cells.
www.dentistry.leeds.ac.uk /biochem/uttb/FASTRUCTURE.HTM   (952 words)

  
 Nutrition Research Newsletter: Clearance Of Postprandial Triacylglycerols From Olive Oil
A recent study was conducted to evaluate the effect of a meal rich in virgin olive oil on triacylglycerol composition of human postprandial TRL, and to assess the role of the triacylglycerol molecular species concentration and polarity on lipoprotein clearance.
At the two and six hour marks, the triacylglycerols in the lipoprotein fraction still resembled the composition of the olive oil, however the proportions of the individual molecular species were altered by the processes leading to their formation.
The proportion of triolein decreased and the proportions of palmitoyl-oleoyllinoleoyl-glycerol and linoleoyl-dioleoyl-glycerol significantly increased compared with the composition of the triacylglycerols in the olive oil.
www.findarticles.com /p/articles/mi_m0887/is_1_19/ai_59017970   (565 words)

  
 Media Portfolio   (Site not responding. Last check: 2007-09-29)
A core of neutral lipids, including triacylglycerols and choleteryl esters, is coated with phospholipids in which apolipoproteins and cholesterol are imbedded.
Because they are essentially insoluble in water, triacylglycerols, cholesterol and cholesteryl esters cannot be transported in the blood or lymph as free molecules.
Th lipase catalyzes the hydrolysis of triacylglycerols to monoacylglycerols and free fatty acids.
cwx.prenhall.com /horton/medialib/media_portfolio/16.html   (624 words)

  
 Instituto de la Grasa (CSIC) Publicaciones   (Site not responding. Last check: 2007-09-29)
The triacylglycerols in the lipoprotein fraction at 2 h generally reflected the composition of the olive oil, however, the proportions of the individual molecular species were altered by the processes leading to their formation.
The fastest conversion of lipoproteins to remnants occurred from 2 to 4 h and was directly related to the concentration of the triacylglycerols in the lipoprotein particle (r = 0.9969, P < 0.05) and not with its polarity (r = 0.1769, P > 0.05).
Abstract: Thermoxidative stability was evaluated in triacylglycerols (TAG) from the oils of the mutant sunflower lines CAS-3, CAS-4 and CAS-8, with high-stearic-acid percentage, and CAS-5, with high-palmitic-acid percentage, all in a standard high-linoleic genetic background, and the mutant sunflower line CAS-12, with high-palmitic-acid percentage in a high-oleic genetic background.
www.ig.csic.es /pub99.html   (13918 words)

  
 Lipid Digestion and Lipoproteins
Dietary triacylglycerols and cholesterol, as well as triacylglycerols and cholesterol synthesized by the liver, are solubilized in lipid-protein complexes.
Chylomicrons are assembled in the intestinal mucosa as a means to transport dietary cholesterol and triacylglycerols to the rest of the body.
The free fatty acids are then absorbed by the tissues and the glycerol backbone of the triacylglycerols is returned, via the blood, to the liver and kidneys.
www.med.unibs.it /~marchesi/lipoprot.html   (2872 words)

  
 Synthesis of Triacylglycerols by the Acyl-Coenzyme A:Diacyl-Glycerol Acyltransferase Dga1p in Lipid Particles of the ...
Triacylglycerols as fatty acid donors for membrane phospholipid biosynthesis in yeast.
Biosynthesis of triacylglycerol in the filamentous fungus Mucor circinelloides.
Triacylglycerol synthesis by an sn-1,2(2,3)-diacylglycerol transacylase from rat intestinal microsomes.
jb.asm.org /cgi/content/full/184/2/519   (4507 words)

  
 570
Analysis of triacylglycerols from oil seeds and other sources are traditionally performed by analysis of the corresponding fatty acid methyl esters using GC.
The dominating triacylglycerols in these oils are O-O-E, O-E-E and E-E-E (O = 18:1; E = 22:1) whereas, as expected, the soya bean and sunflower oils are dominated by triacylglycerols rich in linoleic acid, like L-L-L, L-L-Ln, P-L-L and O-L-L (P = 16:0, L = 18:2, Ln = 18:3).
Identification of the individual triacylglycerols can be done using preparative SFC as illustrated in Figure 3, where the dominating triacylglycerols in Crambe abyssinica oil were fractionated and each fraction identified by GC-analysis after transformation of the triacylglycerols into the fatty acid methyl esters (FAME).
www.regional.org.au /au/gcirc/1/570.htm   (1422 words)

  
 Structural analysis of triacylglycerols
Since no lipase has yet been found that distinguishes between position 1 and 3 of a triacylglycerol molecule, specific chemical and enzymological procedures were devised.
The whole procedure is normally run on two days: the first day diacylglycerols (a mixture of 1,2- and 2,3-sn-isomers) are prepared from the triacylglycerols by a partial hydrolysis with a Grignard reagent.
This enzyme reacts only with the 1,2-diacyl-sn-glycerophosphatides and forms a lysophospholipid containing the fatty acids which were present in position sn-1 of the triacylglycerol molecules while the free fatty acids were released from the sn-2 position.
www.cyberlipid.org /ACYLGLYT/acyl0009.htm   (851 words)

  
 Tramadol, buy tramadol, antibiotics, Weight Loss drugs, weight loss herbs, weight loss herbal formula, weight loss, ...   (Site not responding. Last check: 2007-09-29)
Using mice and a variety of emulsified dietary lipids we found that the absorption of radiolabelled tripalmitin (containing the fatty acid 16:0), but not of triolein (18:1n-9) or tri-gamma-linolenin (18:3n-6), was incomplete from meals rich in esterified palmitate.
These radiolabelled triacylglycerols, which have the same fatty acid in all three positions, may not always be accurate markers of the absorption of dietary triacylglycerols.
Orlistat was more effective at inhibiting the absorption of radiolabelled triacylglycerols with which it was codissolved than those added separately, which indicates that equilibration between lipid phases in the stomach may not always be complete.
altace-online.biz /xenical-online-rx/xenical-online-rx5.10.html   (1091 words)

  
 Use of structured triacylglycerols containing predominantly stearic and oleic acids to probe early events in metabolic ...
Use of structured triacylglycerols containing predominantly stearic and oleic acids to probe early events in metabolic processing of dietary fat -- Summers et al.
Use of structured triacylglycerols containing predominantly stearic and oleic acids to probe early events in metabolic processing of dietary fat
Pufal, D. A., Quinlan, P. T., Salter, A. Effect of dietary triacylglycerol structure on lipoprotein metabolism: a comparison of the effects of dioleoylpalmitoylglycerol in which palmitate is esterified to the 2- or 1(3)-position of the glycerol.
www.jlr.org /cgi/content/full/40/10/1890   (5836 words)

  
 Fasting Lipoprotein and Postprandial Triacylglycerol Responses to a Low-Carbohydrate Diet Supplemented with n-3 Fatty ...
triacylglycerols is associated with a significant increase in
Serum triacylglycerol responses to a high-fat test meal before (closed circles) and after (open circles) an eight-week low-carbohydrate diet supplemented with n-3 fatty acids (upper panel).
a 0.015 mmol/L decrease in serum triacylglycerols [35].
www.jacn.org /cgi/content/full/19/3/383   (4832 words)

  
 Ch08   (Site not responding. Last check: 2007-09-29)
Most dietary fat is supplied in the form of triacylglycerols which must be hydrolyzed to fatty acids and monoacylglycerols before they can be absorbed.
These consist of a core of triacylglycerols and fatty acid esters of cholesterol, and a shell of a single layer of phospholipids interspersed with unesterified cholesterol.
VLDLS are the main carriers of triacylglycerols which are also processed by lipoprotein lipase and supply fatty acids to adipose and muscle tissues.
www.fao.org /docrep/V4700E/V4700E08.htm   (2953 words)

  
 UCR Faculty Listing
The other organelle is the tapetosome, which possesses triacylglycerols and oleosins; only specifically fragmented oleosins will be deposited onto the pollen surface (Figure 2).
At the late stage of anther development before/during/after the tapetum cell lyzes, the tapetosomes undergo selective degradation, and the retained constituents are deposited onto the pollen surface.
All the triacylglycerols are completely degraded, whereas the oleosins are selectively fragmented.
www.facultydirectory.ucr.edu /cgi-bin/pub/public_individual.pl?faculty=599   (998 words)

  
 ARS | Publication request: The Fatty Acid Composition for Triacylglycerols and Phospholipids of the Silverleaf Whitefly   (Site not responding. Last check: 2007-09-29)
Technical Abstract: The internal lipids (triacylglycerols and phospholipids) were extracted from silverleaf whitefly adults and nymphs by sonication in chloroform/methanol (2:1).
Triacylglycerol and phospholipid fractions were recovered from solvent extracts using a silica gel column and fatty acids from the fractions were obtained by alkaline hydrolysis.
Intact triacylglycerols were separated by high performance liquid chromatography (HPLC) and structurally identified by HPLC-MS.
www.ars.usda.gov /research/publications/publications.htm?SEQ_NO_115=128098   (164 words)

  
 [No title]   (Site not responding. Last check: 2007-09-29)
Triacylglycerols are synthesized through two pathways governed by the acyl-CoA diacylglycerol acyltransferase Dga1p and the phospholipid diacylglycerol acyltransferase Lro1p, respectively.
In contrast to neutral lipid formation, mobilization of triacylglycerols and steryl esters in yeast are less characterized at the molecular level.
Only recently, the triacylglycerol lipase Tgl3p was identified as the first yeast enzyme of this kind by function.
www.actabp.pl /html/2_2004/323.html   (236 words)

  
 Omega-3 Forum: Risks from low EPA and DHA
The above triacylglycerol contains 2 saturated fatty acids (C16:0, palmitic acid) and a long-chain polyunsaturated omega-3 fatty acid (C20:5, EPA, eicosapentaenoic acid, at the bottom) which have a different chemical structure.
It is of particular interest that the duodenal uptake rates differ between triacylglycerols and ethyl esters.
Triacylglycerols are rapidly degraded in the duodenum by pancreatic lipase and, in the case of polyunsaturated fatty acids, by carboxylester hydrolase.
www.omega-3-forum.com   (1818 words)

  
 Nutrition For Weight Loss, Issue #003 -- Foods Suspected To Be Functional Foods For Weight Loss
In their review of the literature regarding these four food types, they found that specifically dietary fats may have the most to offer in the fight against obesity, but may only offer benefits in preventing weight gain rather than inducing weight loss.
A weight loss study conducted with both obese men and women found that body weight loss was greater in subjects who consumed foods containing diacylglycerols as opposed to those who consumed triacylglycerols, although the percentage change in the intra-abdominal adipose tissue did not differ.
The researchers attribute this to diacyclglyercerol's ability to increase energy expenditure, fat oxidation and reduce appetite, but concede that the overall effect is very small and will only be effective when used as a part of a rigorous weight loss plan.
www.savvy-fat-burning-food.com /Nutrition_For_Weight_Loss-functional-foods.html   (1371 words)

  
 Lipoproteins
, triacylglycerols are resynthesized from fatty acids and monoacylglycerols.
Lipoprotein Lipase catalyzes hydrolytic cleavage of fatty acids from triacylglycerols from chylomicrons.
With removal of triacylglycerols as well as some proteins, the percentage of weight that is cholesteryl esters increases.
www.rpi.edu /dept/bcbp/molbiochem/MBWeb/mb2/part1/lipoprot.htm   (1630 words)

  
 Source One Global   (Site not responding. Last check: 2007-09-29)
Cholesterol and triacylglycerols were measured with enzymatic timed-endpoint methods by using CHOL Reagent or Triacylglycerol GPO reagent.
To be eligible for participation, individuals had to i) have initial fasting plasma triacylglycerol concentration les than 3.5 mmol/L, ii) be free of thyroid disorders, kidney disease and diabetes, iii) have an alcohol intake of two or less drinks per day.
A significant 28.4% reduction of serum triacylglycerols and a significant 5% increase of apo A1, a structural protein of HDL was observed.
www.source-1-global.com /our_studies_text.html   (964 words)

Try your search on: Qwika (all wikis)

Factbites
  About us   |   Why use us?   |   Reviews   |   Press   |   Contact us  
Copyright © 2005-2007 www.factbites.com Usage implies agreement with terms.