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PubMed2006

Measurement of serum total glycerides and free glycerol by high-performance liquid chromatography.

Serum levels of total glycerides and free glycerol are important indices of lipid metabolism and cardiovascular disease risk. Convenient enzymatic methods of measurement have been available, but they are susceptible to interference. Situations exist in both research and clinical laboratories in which more specific and precise methods are needed. We developed HPLC methods for the measurement of serum total glycerides and free glycerol. For total glycerides, serum was mixed with an internal standard (1,2,4-butanetriol) and treated with alcoholic sodium hydroxide to hydrolyze glycerides to glycerol. After deproteinization with tungstic acid, the glycerol was benzoylated with an optimized Schotten-Baumann reaction and analyzed by HPLC. For free glycerol, serum was equilibrated with the internal standard and deproteinized with tungstic acid to remove the glycerides. The glycerol was benzoylated and analyzed as for total glycerol. Various factors were investigated, and no significant sources of interference were detected. The total coefficients of variation ranged from 0.7% to 2.0% for total glycerides and from 1.7% to 3.2% for free glycerol. The analytical recoveries ranged from 98.5% to 101.6%. In conclusion, simple and reliable HPLC methods for serum total glycerides and free glycerol have been developed. The methods may also be used for the analyses of glycerol or glycerides in other biological samples.

Benzoates↗
PubMed2001

Final report on the safety assessment of Peanut (Arachis hypogaea) Oil, Hydrogenated Peanut Oil, Peanut Acid, Peanut Glycerides, and Peanut (Arachis hypogaea) Flour.

Peanut (Arachis Hypogaea) Oil is the refined fixed oil obtained from the seed kernels of Arachis hypogaea. Hydrogenated Peanut Oil, Peanut Acid, and Peanut Glycerides are all derived from Peanut Oil. Peanut Flour is a powder obtained by the grinding of peanuts. The oils and glycerides function in cosmetic formulations as skin-conditioning agents. The acid functions as a surfactant-cleansing agent, and the flour functions as an abrasive, bulking agent and/or viscosity-increasing agent. In 1998, only Peanut Oil and Hydrogenated Peanut Oil were reported in use. When applied to the skin, Peanut Oil can enhance the absorption of other compounds. Hepatic changes were noted at microscopic examination of rats fed diets containing 15% edible Peanut Oil for 28 days, although no control group was maintained and the findings were also noted in rats fed fresh corn oil. United States Pharmacopeia (USP)-grade Peanut Oil was considered relatively nonirritating when injected into guinea pigs and monkeys. Technical-grade Peanut Oil was moderately irritating to rabbits and guinea pigs and mildly irritating to rats following dermal exposure. This same oil produced reactions in < or = 10% of 50 human males. Peanut Oil was not an ocular irritant in rabbits. Peanut Oil, either "laboratory expressed" or extracted using a food-grade solvent, was not carcinogenic to mice. Peanut Oil exerted anticarcinogenic activity when tested against known carcinogens. Peanuts are the food most likely to produce allergic and anaphylactic reactions. The major allergen is a protein that does not partition into Peanut Oil, Hydrogenated Peanut Oil, Peanut Acid, and Peanut Glycerides. Aflatoxins can be produced in stored agricultural crops such as peanuts, but do not partition into the oils, acids, or glycerides. Manufacturers were cautioned to make certain that the oils, acids, and glycerides are free of aflatoxins and protein. Formulators were cautioned that the oils, acids, or glycerides may enhance penetration and can affect the use of other ingredients whose safety assessment was based on their lack of absorption. The available studies on Peanut Oil supported the conclusion that Peanut Oil, Hydrogenated Peanut Oil, Peanut Acid, and Peanut Glycerides are safe for use in cosmetic formulations. Peanut (Arachis Hypogaea) Flour, however, is sufficiently different from the above ingredients such that its safety can not be supported by studies using the oil. The additional data needed for Peanut (Arachis Hypogaea) Flour are (1) concentration of use; (2) chemical specifications (i.e., aflatoxin and protein levels); (3) method of preparation; and (4) contact urticaria and dermal sensitization at concentration of use. Although data on aflatoxin levels are sought, it is expected that concentrations of aflatoxin should comply with U.S. government stipulations. Absent the additional data, it was concluded that the available data are insufficient to support the safety of Peanut (Arachis Hypogaea) Flour for use in cosmetic products.

Administration, Cutaneous↗
PubMed1975

Studies on the role of insulin in the regulation of glyceride synthesis in rat epididymal adipose tissue.

1. When rat isolated fat-cells were incubated with fructose and palmitate, insulin significantly stimulated glyceride synthesis as measured by either [14C]fructose incorporation into the glycerol moiety or of [3H]palmitate incorporation into the acyl moiety of tissue glycerides. Under certain conditions the effect of insulin on glyceride synthesis was greater than the effect of insulin on fructose uptake. 2. In the presence of palmitate, insulin slightly stimulated (a) [14C]pyruvate incorporation into glyceride glycerol of fat-cells and (b) 3H2O incorporation into glyceride glycerol of incubated fat-pads. 3. At low extracellular total concentrations of fatty acids (in the presence of albumin), insulin stimulated [14C]fructose, [14C]pyruvate and 3H2O incorporation into fat-cell fatty acids. Increasing the extracellular fatty acid concentration greatly inhibited fatty acid synthesis from these precursors and also greatly decreased the extent of apparent stimulation of fatty acid synthesis by insulin. 4. These results are discussed in relation to the suggestion [A.P. Halestrap & R.M. Denton (1974) Biochem. J. 142, 365-377] that the tissue may contain a specific acyl-binding protein which is subject to regulation. It is suggested that an insulin-sensitive enzyme component of the glyceride-synthesis process may play such a role.

Adipose Tissue↗
PubMed1984

Improvement of bioavailability of poorly absorbed drugs. I. Effect of medium chain glyceride base on the rectal absorption of cefmetazole sodium in rats.

The effect of medium chain glyceride on the rectal absorption of cefmetazole sodium is investigated using an in situ experiment in rats. Each glyceride component of medium chain glyceride was separated using a high-performance liquid chromatographic method. The promoting effect of medium chain glyceride was found to be mainly due to glycerylmonocaprylate and dependent on the concentration of glycerylmonocaprylate. When cefmetazole sodium in medium chain glyceride solution was administered into the rectal lumen of rats, rapid absorption of the drug was observed leading to a residual amount of about 45% at 15 min after administration. The promoting effect of medium chain glyceride was found to be more effective in the rectum than in the small intestine.

Animals↗
PubMed1969

The effect of starvation on the incorporation of palmitate into glycerides and phospholipids of rat liver homogenates.

1. Glyceride biosynthesis from glycerol phosphate and [1-(14)C]palmitate was studied in liver homogenates of rats that were fed ad libitum or starved for 36-40hr. The changes in enzyme activity were related to total DNA content or total liver homogenate as these were found to be equivalent and to be the most meaningful parameters. 2. In liver homogenates from fed rats, labelled palmitate was incorporated mainly into phosphatidate (58% of the total incorporation into lipids), diglycerides (25%) and triglycerides (16%), whereas monoglycerides, cholesterol esters and phospholipids other than phosphatidate were labelled only to a small extent. Addition of particle-free supernatant to full homogenates increased the total incorporation of palmitate by 45% and the pattern of incorporation altered to 53% incorporated into triglycerides, 24% into diglycerides and 17% into phosphatidate. This result suggested that, in liver homogenates, phosphatidate phosphohydrolase (EC 3.1.3.4) may be rate-limiting in the biosynthesis of glycerides via the glycerol phosphate pathway. 3. Upon starvation, the amount of palmitate incorporated per liver into total phospholipids plus glycerides was decreased to between 68% and 75% of that observed with fed animals. In homogenates from fed animals 41-44% of the labelled phospholipids plus glycerides was in glycerides; this value increased to between 63% and 75% with starved rats. Of the palmitate incorporated into total phospholipids, between 85% and 86% was found in phosphatidate, independent of the nutritional state of the animal. The ratio of palmitate incorporated into triglycerides/diglycerides rose from 0.7, obtained with fed rats, to 1.0 with starved animals. 4. These results indicate that starvation caused a decrease in the activity (per total liver) of acyl-CoA-glycerol phosphate acyltransferase(s) (EC 2.3.1.15) and an increase in the activity of acyl-CoA-diglyceride acyltransferase (EC 2.3.1.20). The largest change, however, seemed to be related to the increased activity of the phosphatidate phosphohydrolase in the particle-free supernatant. 5. The latter enzyme was assayed in the particle-free supernatant with membrane-bound phosphatidate as substrate. In starvation, the activity per total liver was increased to between 130% and 190% and the specific activity to between 180% and 320% of the values for fed rats.

Acyltransferases↗
PubMed1989

Effect of cholesterol on structural and dynamic properties of tripalmitoyl glyceride. A high-pressure infrared spectroscopic study.

The infrared spectra of tripalmitoyl glyceride confirm the tuning fork configuration previously attributed to trilauroyl glyceride (Small, D. M. 1986. Handbook of Lipid Research. Vol. 4). The acyl chains in solid tripalmitoyl glycerol, either within each molecule or between neighboring molecules, are oriented parallel to each other with the sn-3 acyl chains extended toward the opposite direction of the sn-1 and sn-2 chains. The presence of cholesterol increases the orientational disorder of the tripalmitoyl glyceride molecules in terms of increased reorientational fluctuations and twisting/torsion motions of the acyl chains. In the solid mixture, cholesterol is embedded in the tripalmitoyl glyceride lattice which results in a reorientation of the acyl chains within each molecule from a parallel packing to a nonparallel packing. No evidence was found for hydrogen bond formation between the OH group of cholesterol and any of the three C = O groups of tripalmitoyl glyceride.

Cholesterol↗
PubMed1981

Dissolution of cholesterol ductal stones in the biliary tree with medium-chain glycerides.

In vitro and in vivo experiments were carried out with medium-chain glycerides. In vitro, cholesterol gallstones were rapidly dissolved by medium-chain glycerides; control experiments with saline solution failed to modify the size of the stones. In vivo, medium-chain glycerides were instilled through an intraductal tube in 12 patients with retained bile duct stones. Perfusions lasted 2-10 days. After perfusion, stones disappeared in six cases, were reduced in size in one case, and remained unchanged in five cases. In five cases, nausea, vomiting, diarrhea, or pain were observed. Medium-chain glyceride infusion rapidly dissolves cholesterol gallstones, but is commonly associated with mild to severe side effects.

Cholesterol↗
PubMed1989

Rapid effects of insulin and glucose on the hepatic incorporation of gluconeogenic substrates into glyceride glycerol and glycogen.

1. The hepatic utilization of gluconeogenic substrates was investigated shortly after portal infusion of either insulin or glucose in fasted rats. 2. After 20 min of insulin infusion blood glucose concentration decreased. However, neither glucose generation from precursors such as alanine or pyruvate nor their incorporation into fatty acids was modified. Under these conditions, insulin rapidly increased the incorporation of gluconeogenic substrates into the hepatic glyceride glycerol fraction. Insulin treatment led to a decrease in substrate incorporation into liver glycogen. 3. After 20 min of portal glucose infusion both plasma insulin and glucose concentrations increased and the incorporation of pyruvate into hepatic glyceride glycerol and into glycogen was also stimulated. 4. A close relationship was observed between blood glucose concentrations and the level of incorporation of gluconeogenic substrates into liver glycogen. 5. In conclusion, during fasting insulin stimulates the incorporation of gluconeogenic substrates into the glycerol moiety of hepatic glycerides, which may be the preferential mechanism through which fatty acid esterification is accomplished during refeeding. This effect of insulin is rapid and detected even before other classical modifications induced by the hormone such as gluconeogenesis inhibition or lipogenesis activation. Furthermore, the effect is not related to insulin-induced hypoglycemia since glucose infusion mimics insulin action on glyceride glycerol synthesis.

Alanine↗
PubMed1995

Effects of temperature and glycerides on the enhancement of Agkistrodon piscivorus piscivorus phospholipase A2 activity by lysolecithin and palmitic acid.

The effect of temperature and various glycerides to modulate the ability of lysolecithin and fatty acid to promote high phospholipase A2 activity was studied using dipalmitoylphosphatidylcholine large unilamellar vesicles as substrate. The length of the lag phase prior to the accumulation of sufficient hydrolysis products (lysolecithin and fatty acid) to support high phospholipase activity was shortest at temperatures near the thermotropic phase transition of the phospholipid substrate. A reduction in the lag phase correlated with a reduction in the requirement for hydrolysis products at the phase transition temperature, where the bilayer exists in a state of fluctuating domains of gel and liquid crystal. Dipalmitoylglycerol and tripalmitoylglycerol also reduced the length of the lag phase. This reduction was both concentration-dependent and temperature-dependent relative to the phase transition in the presence of the glycerides. As with the effect of temperature, the ability of di- and triglycerides to decrease the lag time correlated with a decrease in the amount of reaction products necessary to promote high phospholipase activity. This effect coincided with the tendency of the glycerides to form domains in the bilayer. Glycerides that did not form domains either had no effect (monopalmitoylglycerol) or increased the length of the lag phase (dicaprylglycerol). These data suggest that the effect of the reaction products to increase phospholipase A2 activity is aided by the presence of fluctuations in lipid domains within the bilayer.

Agkistrodon↗
PubMed1971

The effect of noradrenaline on glyceride synthesis and oxidative metabolism in vitro in the brown fat of newborn rabbits.

1. The effect of noradrenaline on the synthesis of glyceride from [U-(14)C]glucose and on gas exchange in the brown fat of newborn rabbits in vitro was investigated. 2. The specific radioactivity of l-glycerol 3-phosphate was lower than that of lactate, presumably because glycerol derived from glyceride was rephosphorylated by glycerokinase. 3. In the basal state more than 25% of the total respiration was due to pyruvate oxidation. Noradrenaline stimulated glyceride synthesis and total respiration without changing the proportion of the total respiration due to pyruvate oxidation. 4. The extra ADP released by noradrenaline stimulation of glyceride synthesis could not have supported more than 2% of the observed increase in substrate oxidation if mitochondria from brown-fat-cells remain fully coupled in the stimulated state, but could have supported about one-third of the observed increase if they become uncoupled in the presence of noradrenaline.

Adipose Tissue, Brown↗
PubMed1986

Study on the effect of a high fat diet on diaphragm and liver glycogen and glycerides in the rat.

The present work was undertaken to study the effect of nutritional obesity induced by a high fat diet on the consumption of glycogen and glycerides in rat liver and diaphragm. Groups of rats were fed for five weeks from weaning either a fat-rich-carbohydrate (CHO)-poor diet, or a CHO-rich-fat-poor diet. Basal plasma glucose and free fatty acids (FFA) were significantly increased in the animals adapted to the fat-rich diet. Half of the rats were submitted to a 48-h fast. After fast, basal plasma glucose and immunoreactive insulin (IRI) fell significantly, whereas plasma FFA levels were higher than in the group fed the CHO-rich-fat-poor diet. In the liver, glycogen concentration fell in both groups after fast, with a glycogen breakdown of 1930 +/- 244 mumole glycogen glucose/liver in the fat-fed group vs 4636 +/- 216 mumole/liver in the CHO-fed group. Glycerides fell by 750 +/- 68 mumole glyceride glycerol/liver in the fat-fed rats while remaining unchanged (increased by 82 +/- 57 mumole/liver) in the CHO-fed group. In the diaphragm glycogen concentration also fell in both groups, with a glycogen breakdown of 6.0 +/- 0.3 mumole glycogen glucose/g wet tissue in the fat-fed rats vs 15.2 +/- 1.4 mumole/g wet tissue in the CHO-fed animals. Glycerides fell by 23.1 +/- 4.0 mumole/g wet diaphragm in the CHO-fed animals. The lower breakdown of glycogen in both liver and diaphragm of fat-fed rats demonstrates a decreased utilization of glycogen during fast, with energy consumption originating in larger part from triglycerides.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗
PubMedDate not supplied

Polychlorinated biphenyls: in vivo and in vitro modifications of phospholipid and glyceride biosynthesis.

In vivo administration of Aroclor 1254 (PCB) alters the biosynthesis of glycerides and phospholipids. Different percentages of total radioactivity distribution patterns were observed in microsome, mitochondria, and homogenate preparations from rat liver. (14C)palmitate and (U-14C)sn-glycerol-3-phosphate were differently incorporated when assayed in the same preparation, suggesting compartmentation of the substrates. Acyl CoA sn-glycerol-3-phosphate acyl transferase was inhibited by PCB in vitro. Inhibition was noncompetitive. After 30 days of dietary pretreatment with PCB, acyl CoA sn-glycerol-3-phosphate acyl transferase activity was increased in the liver. In vitro, the total radioactivity incorporated into phospholipids and glycerides was decreased in the presence of PCB. There was, however, no significant change in the percent of total distribution of radioactivity when either (U-14C)sn-glycerol-3-phosphate or (1-14C)palmitate was the substrate. PCB had no significant effect on glycerol kinase activity. PCB initially did not inhibit phosphatidate, but after prolonged incubation there was a small increase or decrease under in vitro and in vivo conditions respectively. Phosphorylase b, but not phosphorylase a, was inhibited by PCB. 2,4,5,2'4',5'-hexachlorobiphenyl inhibited sn-glycerol-3-phosphate acyl transferase, phospholipid biosynthesis, and glyceride biosynthesis. The results indicate that PCB alters biosynthesis of phospholipids and glycerides in vitro and in vivo. Apparent differences between the results obtained under the two conditions are probably due to qualitative and/or quantitative variations in metabolic products formed from PCB in vivo.

Animals↗
PubMed1986

Neutral glyceride synthesis from glucose in human adipose tissue: comparison between growing and mature subjects.

Basal and insulin-stimulated neutral glyceride syntheses from glucose were studied in fat cells of different size (fat cell volume, 0.07-0.20, 0.20-0.60, 0.60-1.00, 1.00-1.50 micron3 X 10(6)) obtained from subcutaneous adipose tissues in 20 subjects aged 3 months to 67 years. In 0.07-0.20 or 0.20-0.60 micron3 X 10(6) fat cells, the basal rate of glucose conversion to neutral glyceride was significantly lower in mature (36 to 67 years old) than in growing (0 to 12 years old) subjects. In 0.60-1.00 or 1.00-1.50 micron3 X 10(6) fat cells, however, basal rate was not significantly different between the two groups. The stimulating effect of insulin on conversion of glucose to neutral glyceride was not significantly different from the basal rate in fat cells of each size taken from the mature subjects, whereas in fat cells from growing subjects, it was significantly different from the basal rate in each fat cell size category. These results indicate that when fat cell size is taken into account, not only is the rate of basal glucose conversion to neutral glyceride higher in growing subjects but also its responsiveness to exogenous insulin, and that insulin insensitivity of large fat cells, reported previously, may be influenced by age.

Adipose Tissue↗
PubMed1977

[Human erythrocyte glycerides].

There are difficulties in measuring red cell glycerides mainly because the amount found in erythrocytes is so differne from that of other lipids in blood cells. The red corpuscles contain only very small quantities of glycerides, about 5mg/1, while the amount of cholesterol and phospholipids is 200 to 500 times higher. The methods currently used for estimating glycerides in serum can be used here only after removing these other lipids. The distribution of glycerides in erythrocytes is ver different from that of serum: serum contains mainly triglycerides while there are diglycerides as well as triglycerides in erythrocytes (on average 3,4 micro mol/1 of triglycerides and 1,7 mumol/1 of diglycerides).

Cholesterol↗
PubMed1981

"In Vitro" utilization of labelled esterified fatty acids and glyceride glycerol from triglyceride-rich lipoproteins in rat adipose tissue.

Triglyceride-rich lipoproteins (chylomicrons and very low density lipoproteins) were labelled "in vivo" by injecting (U-14C)-glycerol and (9-10(n)-3H)-palmitate in female rats. After purification, these lipoproteins contained most of the 3H in esterified fatty acids and the 14C in glyceride glycerol of neutral lipids. This preparation was incubated "in vitro" in the presence of either isolated adipocytes or epididymal fat pad pieces from male rats. With the incubation, a certain proportion of both 3H-esterified fatty acids and 14C-glyceride glycerol disappeared from the medium, the effect being greater when the incubations were performed with adipocytes than with fat pad pieces. Much greater radioactivity appeared in the lipids of adipocytes than in those of fat pad pieces at the end of 60 or 120 min incubation, and the incorporation of 3H being relatively greater than that of 14C. With the latter isotope, the label appeared not only in the glyceride glycerol fraction but also in the free and esterified fatty acids. Although it is known that lipoproteins lipase activity is lower in adipocytes than in fat pad pieces, our results indicate that, in the former preparation, the enzyme may be more accessible for the substrate. These data also demonstrate that glycerol released by the hydrolysis of lipoprotein glycerides may be partially incorporated into lipids by adipose tissue.

Adipose Tissue↗
PubMed1975

Effect of epinephrine on the synthesis of glyceride glycerol in adipose tissue in vitro.

In order to study the effect of epinephrine on the rate of esterification of fatty acids in adipose tissue, pieces of epididymal fat pad were incubated in KRB in the presence of purified albumin, glucose and either 1-14C-glycerol, 1-14C-glucose or 6-14C-glucose. Epinephrine enhances the production of glycerol but reduces the uptake of 1-14C-glycerol by the tissue and its conversion to 14CO2, 14C-fatty acids and 14C-glyceride glycerol. When the change in specific activity of the tracer is taken into account the effect of epinephrine on the utilization of glycerol by the tissue is only observed in the reduction of glyceride glycerol synthesis. When 14C-labelled glucose was used as tracer, epinephrine enhances both the production of 14CO2 from 6-14C-glucose and the synthesis of 14C-glyceride glycerol from 1-14C and 6-14C-glucose. The contrasting effects of epinephrine on the glyceride glycerol formation from glycerol and from glucose can explain the difficulties found in observing any change in the net rate of esterification of fatty acids by adipose tissue.

Adipose Tissue↗
PubMed1993

Effects of nicotinic acid treatment on glyceride formation and lipolysis in adipose tissue of hyperlipidemic patients.

Thirty-one weight-stable patients with different types of hyperlipoproteinemia were treated daily with 4 g nicotinic acid for 6 weeks. Effects of this therapy on adipose tissue metabolism were evaluated. By using biopsy specimens of subcutaneous adipose tissue, fatty acid and glucose incorporation into adipose tissue glycerides were measured in vitro as well as glycerol and fatty acid release, which allowed us to estimate adipose tissue lipolysis. The amount of fatty acids produced by lipolysis and thereafter utilized within adipose tissue without being released (fatty acid retention) was estimated. Fatty acid and glucose incorporation into adipose tissue, glycerol release and fatty acid retention values increased, but serum triglyceride levels decreased (all P < 0.001) after nicotinic acid treatment. The change in fatty acid incorporation was positively correlated with changes in glucose incorporation into adipose tissue (r = 0.53, P < 0.01) and fatty acid retention (r = 0.76, P < 0.001). Although adipose tissue lipolysis, measured as glycerol release, increased, the lipolyzed fatty acids were retained in adipose tissue, suggesting an enhanced synthesis of glycerides both from exogenous and endogenous sources. The increase in fatty acid incorporation into adipose tissue indicates that the decrease in serum triglyceride levels produced by nicotinic acid treatment may partly be due to the fact that this drug promotes incorporation of fatty acids, derived from lipoprotein-carried triglycerides in the blood, into adipose tissue glycerides.

Adipose Tissue↗
PubMed1997

Enzymatic hydrolysis of anchovy oil: production of glycerides enriched in polyunsaturated fatty acids.

In an attempt to produce the polyunsaturated fatty acid (PUFA)-enriched glycerides, commercially available Turkish anchovy oil (PUFA content of 27%), was hydrolyzed with 1,3-specific Rhizomucor miehei lipase. After the hydrolysis, the triglyceride (TG), diglyceride (DG), monoglyceride (MG), and free fatty acid (FFA) composition of the reaction mixture was determined, and fatty acid components of these fractions were analyzed. R. miehei lipase released PUFA extremely slowly, resulting in their accumulation in the TG and DG fractions, especially in TG. The PUFA content in the glyceride mixture (including TG, DG, and MG) increased as hydrolysis progressed. The effects of operational parameters (pH, temperature, time, and enzyme concentration) on the extent of hydrolysis were investigated. Based on these results, optimal reaction conditions were established. At optimal conditions (pH 4.0, 35 degrees C, 3 h, and enzyme concentration of 500 U/g oil), the level of PUFA in the glyceride mixture was raised to 40%. The individual TG and DG fractions contained 45 and 30% PUFA, respectively. Less than 2% of the total PUFA was lost in the FFA fraction.

Fatty Acids, Unsaturated↗