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PubMed1985

Aversion of the cat to dietary medium-chain triglycerides and caprylic acid.

Young, specific-pathogen-free cats were fed purified diets containing different sources of fat. Food intake was depressed and cats lost weight when the diet contained either hydrogenated coconut oil (HCO) or medium-chain triglycerides (MCT). With an MCT preparation enriched in 8:0 (MCT8), cats would not eat after first tasting the diet. When cats were offered a choice of two high-fat diets, they chose the basal diet over a diet containing 30% HCO, by a ratio of 4.5:1. Low levels of MCT8 (5% or 10% by weight) were also rejected, whereas cats did not reject 5% or 15% MCT12. Caprylic acid, at 0.1-1.0% of the diet, was rejected. In other studies, food intake and body weight decreased when HCO was added to a fat-free diet. Cats fed 25% or 35% HCO lost weight. When 5% safflower seed oil was added to the HCO diets, body weights and food intake improved, but were still less than optimal. These studies indicate that the food intake depression in cats fed dietary HCO and MCT is primarily a result of impalatability, and that the fatty acid moiety may be responsible for the aversion.

Animals↗

PubMed1989

Purification of IgG from serum with caprylic acid and ammonium sulphate precipitation is not superior to ammonium sulphate precipitation alone.

Immunoglobulin G (IgG) from bovine serum raised against Aeromonas Salmonicida was purified by ammonium sulphate precipitation (ASP) or caprylic acid treatment followed by ammonium sulphate precipitation (CAAS). Purity of IgG samples prepared by both methods were examined by High Performance Gel Permeation Chromatography, electrophoresis and antibody activity assay. Results suggest that IgG prepared by ASP is better than that obtained by CAAS method in terms of the yield of the IgG monomers and the recovery of the antibody activity.

Aeromonas↗

PubMed1995

Caprylic acid, a medium chain saturated fatty acid, inhibits the sodium inward current in neuroglioma (NG108-15) cells.

The effects of caprylic acid (CA) on ionic currents were investigated, using the whole-cell patch-clamp technique, in differentiated neuroglioma cells. External application of CA reduced the peak amplitude of the inward Na+ current, while outward currents were not affected. CA (1 and 5 mM) reversibly attenuated the peak of the inward Na+ current by 21% (n = 26) and 46% (n = 31), respectively. The inactivation curve in the presence of CA was shifted by 8 mV toward hyperpolarized potentials, with half-inactivation voltage being -47.9 and -55.9 before and after external application of CA (5 mM), respectively. This shift was readily reversed after 5 min wash. The slope remained unchanged (-8.4 and -8.8 mV, respectively, n = 4). The activation process was unaffected (CA 5 mM, n = 8). Under current-clamp conditions, CA 5 mM (but not 1 mM) reversibly reduced the amplitude, and the slope of the rising phase of the action potential. These results agree with the fact that free fatty acids can modulate the activity of ion channels by mechanisms which do not involve enzymatic or membrane disruptive pathways.

Action Potentials↗

PubMed2006

Structured triglycerides containing caprylic (8:0) and oleic (18:1) fatty acids reduce blood cholesterol concentrations and aortic cholesterol accumulation in hamsters.

The effects of structured triglycerides containing one long chain fatty acid (oleic acid, C18:1) and one short chain saturated fatty acid (caprylic acid, 8:0) on lipidemia, liver and aortic cholesterol, and fecal neutral sterol excretion were investigated in male Golden Syrian hamsters fed a hypercholesterolemic regimen consisting of 89.9% commercial ration to which was added 10% coconut oil and 0.1% cholesterol (w/w). After 2 weeks on the HCD diet, the hamsters were bled, following an overnight fast (16 h) and placed into one of three dietary treatments of eight animals each based on similar plasma cholesterol levels. The hamsters either continued on the HCD diet or were placed on diets in which the coconut oil was replaced by one of two structured triglycerides, namely, 1(3),2-dicaproyl-3(1)-oleoylglycerol (OCC) or 1,3-dicaproyl-2-oleoylglycerol (COC) at 10% by weight. Plasma total cholesterol (TC) in hamsters fed the OCC and COC compared to the HCD were reduced 40% and 49%, respectively (P<0.05). Similarly, hamsters fed the OCC and COC diets reduced their plasma nonHDL cholesterol levels by 47% and 57%, respectively (P<0.05), compared to hamsters fed the HCD after 2 weeks of dietary treatment. Although hamsters fed the OCC (-26%) and COC (-32%) had significantly lower plasma HDL levels compared to HCD, (P<0.05), the plasma nonHDL/HDL cholesterol ratio was significantly lower (P<0.05) compared to the HCD for the OCC-fed (-27%) and the COC-fed (-38%) hamsters, respectively. Compared to the HCD group, aortic esterified cholesterol was 20% and 53% lower for the OCC and COC groups, respectively, with the latter reaching statistical significance, P<0.05. In conclusion, the hamsters fed the structured triglyceride oils had lower blood cholesterol levels and lower aortic accumulation of cholesterol compared to the control fed hamsters.

Animals↗

PubMed2005

Investigation of the enhancing mechanism of sodium N-[8-(2-hydroxybenzoyl)amino]caprylate effect on the intestinal permeability of polar molecules utilizing a voltage clamp method.

Oral administration of sodium N-[8-(2-hydroxybenzoyl)amino]caprylate (SNAC) has been reported to increase the bioavailability of various macromolecules. The present study was aimed to study the effect of SNAC on the intestinal tissue permeability of polar charged molecules, using 6-carboxy-fluorescein (6-CF) as a model. The effects of SNAC on rat intestinal permeability was investigated ex vivo by utilizing voltage clamp experiments in a side-by-side diffusion chamber model in comparison with the effect of EDTA (10mM). The intestinal permeability of 6-CF was increased two-fold in the presence of 33-66 mM SNAC, and by 6.5-fold in the presence of 10mM EDTA. The voltage clamp experiments show that the effect of SNAC was particularly on the transcellular 7-folds increase (that was five times larger than the paracellular transport of the model agent). While EDTA affected predominantly paracellular pathway transport, SNAC 33-66 mM had no effect on [(3)H]-mannitol transport or any toxic effect on tissue integrity measured by TEER values. In conclusion, this study demonstrates that SNAC can facilitate passive transport of polar charged molecules through the membrane of epithelial enterocytes. This is noteworthy in view of the very low tendency of a charged molecule to permeate across the lipophilic inter-phase of the enterocytes membrane.

Animals↗

PubMed2003

Fractionation of equine antivenom using caprylic acid precipitation in combination with cationic ion-exchange chromatography.

A combined process of caprylic acid (CA) precipitation and ion-exchange chromatography on SP-Sepharose was studied as a means to fractionate pepsin-digested horse antivenom F(ab')(2) antibody. In the CA precipitation, the optimal concentration for fractionation of F(ab')(2) from pepsin-digested horse plasma was 2%, in which 89.61% of F(ab')(2) antibody activity was recovered in the supernatant with 1.5-fold purification. A significant amount of pepsin was not precipitated and remained active under these conditions. An analytical cation exchanger Protein-Pak SP 8HR HPLC column was tested to establish optimal conditions for the effective separation of IgG, albumin, pepsin and CA from the F(ab')(2) product. From these results, the supernatant from CA precipitation of pepsin-digested plasma was subjected to a SP-Sepharose column chromatography using a linear salt gradient. With stepwise elution, a peak containing F(ab')(2) antibody could be obtained by elution with 0.25 M NaCl. The total recovery of antibody was 65.56% with 2.91-fold purification, which was higher than that achieved by ammonium sulfate precipitation. This process simultaneously and effectively removed residual pepsin, high molecular weight aggregates and CA in the final F(ab')(2) product, and should be suitable for large-scale fractionation of therapeutic equine antivenoms.

Animals↗

PubMed2005

Caprylic acid infusion acts in the liver to decrease food intake in rats.

Hepatic portal vein (HPV) infusion of the medium chain fatty acid caprylic acid (CA; 2.3 mg/min, 40 microl/min) for 90 min beginning at dark onset in 18-h food-deprived male rats reduced the size of the first nocturnal meal about 40% (P < 0.01) and reduced 24-h food intake by about 15% (P < 0.001). Identical infusions into the vena cava affected neither initial meal size nor food intake. HPV CA infusion attenuated the postprandial decreases in plasma free fatty acids (P < 0.01) and beta-hydroxybutyrate (P < 0.01). HPV CA infusions did not significantly reduce nocturnal saccharine intake in a two-bottle conditioned taste aversion test, and there was no association between the saccharine intake on the test day and the feeding-inhibitory effect of CA on the conditioning day. HPV CA infusion did not affect plasma concentrations of corticosterone or of the pro-inflammatory cytokines interleukin-6 and tumor necrosis factor-alpha. HPV CA infusion did not increase plasma concentration of the liver enzyme alanine aminotransferase, but did increase plasma concentration of gamma-glutamyl transferase, although not into the pathophysiological range. These data indicate that CA acts in the liver to produce a signal that inhibits feeding and that this inhibitory effect may be related to increases in hepatic fatty acid oxidation rather than be the result of aversion or toxicity.

3-Hydroxybutyric Acid↗

PubMed2006

Hepatic-portal oleic acid inhibits feeding more potently than hepatic-portal caprylic acid in rats.

In several human and animal studies, medium-chain triglycerides decreased food intake more than did long-chain triglycerides. It is possible that faster uptake and metabolism of medium-chain fatty acids in the liver is responsible for this difference. To test this hypothesis we compared the feeding effects of hepatic portal vein (HPV) infusion of the medium-chain fatty acid caprylic acid (CA) with those of the long-chain fatty acid oleic acid (OA). Contrary to our expectation, six-h HPV infusion of 14 microg/min (50 nmol/min) OA robustly inhibited feeding, whereas infusion of 22 or 220 microg/min (150 and 1500 nmol/min) CA failed to have any effect on feeding. Only a much larger dose of CA, 1100 microg/min (7500 nmol/min) inhibited feeding similarly to 14 microg/min OA. The increased feeding-inhibitory potency of OA did not appear to be due to differences in stimulation of hepatic fatty acid oxidation because equimolar (50 nmol/min) doses of OA (14 microg/min) and CA (7 microg/min) did not differentially affect post-infusion levels of beta-hydroxybutyrate. Stress, inflammation, acute hepatotoxicity or oxidative stress also do not appear to account for the increased feeding-inhibitory potency of HPV OA because plasma concentrations of the stress hormones corticosterone and epinephrine, the pro-inflammatory cytokines interleukin-6 and tumor necrosis factor-alpha, the liver enzymes gamma-glutamyl transferase and alanine aminotransferase and as well as hepatic levels of malondialdehyde and glutathione were all similar after HPV infusion of saline or of 50 nmol/min OA or CA.

Animals↗

PubMed2005

Factors associated with adverse reactions induced by caprylic acid-fractionated whole IgG preparations: comparison between horse, sheep and camel IgGs.

Caprylic acid purification of IgG, currently used in the manufacture of horse-derived antivenoms, was successfully adapted for the preparation of sheep and camel IgG. Sheep IgG had a molecular mass of approximately 150 kDa, whereas camel IgG presented two bands of molecular masses of approximately 160 and 100 kDa, the latter corresponding to heavy-chain IgG, which is devoid of light chains. Horse, sheep and camel IgGs were compared by several parameters aiming at predicting their potential for induction of early and late adverse reactions. Horse and sheep IgGs showed a higher anticomplementary activity than camel IgG, and also elicited a higher anti-IgG response than camel IgG, when injected in mice. Horse IgG agglutinated human type O+ erythrocytes, whereas no such reactivity was observed in sheep and camel IgG preparations. A novel procedure was used for the detection of antibodies in human serum against animal IgGs. It was found that a pool of human sera collected in Costa Rica had a higher titer of antibodies directed against horse and sheep IgGs than against camel IgG. Overall, camel IgG showed the lowest potential for the induction of adverse reactions among the three IgGs tested.

Animals↗

PubMed2006

Efficacy and safety of two whole IgG polyvalent antivenoms, refined by caprylic acid fractionation with or without beta-propiolactone, in the treatment of Bothrops asper bites in Colombia.

The efficacy and safety of two whole IgG polyvalent antivenoms (A and B) were compared in a randomised, blinded clinical trial in 67 patients systemically envenomed by Bothrops asper in Colombia. Both antivenoms were fractionated by caprylic acid precipitation and had similar neutralising potencies, protein concentrations and aggregate contents. Antivenom B was additionally treated with beta-propiolactone to lower its anticomplementary activity. Analysing all treatment regimens together, there were no significant differences between the two antivenoms (A=34 patients; B=33 patients) in the time taken to reverse venom-induced bleeding and coagulopathy, to restore physiological fibrinogen concentrations and to clear serum venom antigenaemia. Blood coagulability was restored within 6-24 h in 97% of patients, all of whom had normal coagulation and plasma fibrinogen levels 48 h after the start of antivenom treatment. Two patients (3.0%) had recurrent coagulopathy and eight patients suffered recurrence of antigenaemia within 72 h of treatment. None of the dosage regimens of either antivenom used guaranteed resolution of venom-induced coagulopathy within 6 h, nor did they prevent recurrences. A further dose of antivenom at 6 h also did not guarantee resolution of coagulopathy within 12-24 h in all patients. The incidence of early adverse reactions (all mild) was similar for both antivenoms (15% and 24%; P>0.05).

Adolescent↗

PubMed2000

Stabilizing effects of caprylate and acetyltryptophanate on heat-induced aggregation of bovine serum albumin.

Acetyltryptophanate (AT) and caprylate (Cap) have been used to stabilize serum albumin against heat treatment. However, the mechanism of stabilization by these additives has never been fully elucidated. Here we used thermal melting to determine the effects of these additives on the melting temperature of bovine serum albumin (BSA) and heat stress at 60 degrees C to follow degradation of the protein in the presence of varying concentrations of AT or Cap. Native polyacrylamide gel electrophoresis was used to examine degradation products generated by heat treatment. Both additives increased the melting temperature of BSA, resulting in an increase by 12 degrees C at 5 mM AT and 3 degrees C at 1 mM Cap. They also conferred stability to BSA against heat stress at 60 degrees C. Complete protection was observed at 5 mM AT and 1 mM Cap. Comparison of AT and Cap in their effects on melting temperature and heat stress-induced degradation showed that a greater protection occurs with Cap which has a weaker effect on melting temperature. Based on this observation it was concluded that the observed protection by AT may be explained by its effects on melting temperature while that of Cap should be ascribed to other mechanisms.

Animals↗

PubMed1986

A rapid colorimetric assay for the extracellular lipase of Pseudomonas fluorescens B52 using beta-naphthyl caprylate.

Conditions necessary for the determination of crude extracellular lipase activity from Pseudomonas fluorescens B52 using beta-naphthyl caprylate (beta-NC), an 8-carbon ester, as the substrate were examined. Maximum enzyme synthesis occurred at 20 degrees C in pyruvate mineral salts medium containing 1 mM-CaCl2. Bile salts were necessary for enzyme activity; 6 mM-Na taurocholate or Na deoxycholate gave maximum activity but the latter compound was inhibitory at higher concentrations. Activity was optimal in N-Tris[hydroxymethyl]methyl-2-aminoethane sulphonic acid buffer pH 8.0 at 40 degrees C. A comparison of beta-NC with beta-naphthyl butyrate (a 4-carbon ester) and beta-naphthyl myristate (a 14-carbon ester) showed that beta-NC was the best substrate; Km values of 0.0415, 0.141 and 0.200 mM and Vmax values of 67.2, 20.1 and 5.28 mumol ml-1 h-1 were obtained for those substrates respectively. The enzyme was inhibited 50% in its activity against beta-NC by 0.009 mM-EDTA, 0.0007% (w/v) mixed alkyltrimethylammonium bromide and 0.00275% (w/v) Triton X-100. The biochemical properties determined using beta-NC as substrate are consistent with those reported for the lipases of other strains of Ps. fluorescens using natural substrates.

Bile Acids and Salts↗

PubMed1986

Determination of the extracellular lipases of Pseudomonas fluorescens spp. in skim milk with the beta-naphthyl caprylate assay.

A method based on the hydrolysis of beta-naphthyl caprylate (beta-NC) has been developed for quantitating extracellular lipase from Pseudomonas fluorescens. The assay was extremely sensitive to skim milk (SM); as little as 0.02 ml raw SM in a 2.0 ml reaction mixture resulted in an apparent loss of 50% of the lipase activity. Activity improved 3-fold when trypsin (50 micrograms/ml) was included in the reaction mixture. When super-simplex optimization was used to determine the optimum levels of beta-NC, Na taurocholate (NaTC), SM/lipase mixture and trypsin for maximum activity, NaTC was found to be unnecessary for activity. Subsequent addition of 15 mM-NaTC resulted in 80% loss of activity. On the other hand, NaTC was required for native lipase activity in the presence of SM. Native lipase was completely inhibited by heating at 70 degrees C for 2 min, while B52 lipase retained 75% of its activity under the same conditions. The assay was able to detect lipase produced by Ps. fluorescens B52 in SM at 5 degrees C when the cell density exceeded 10(8) colony forming units/ml. The presence of butterfat (3.5%) in the SM assay inhibited B52 lipase by 97%. The beta-NC assay gave results comparable to the tributyrin agar diffusion assay using cell-free extracts of ten strains of common dairy psychrotrophs. The results suggest that the beta-NC assay may be useful for determining lipase activity in raw SM.

Animals↗

PubMedDate not supplied

Production of structured lipids by acidolysis of an EPA-enriched fish oil and caprylic acid in a packed bed reactor: analysis of three different operation modes.

Structured triacylglycerols (ST) enriched in eicosapentaenoic acid (EPA) in position 2 of the triacylglycerol (TAG) backbone were synthesized by acidolysis of a commercially available EPA-rich oil (EPAX4510, 40% EPA) and caprylic acid (CA), catalyzed by the 1,3-specific immobilized lipase Lipozyme IM. The reaction was carried out in a packed bed reactor (PBR) operating in two ways: (1) by recirculating the reaction mixture from the exit of the bed to the substrate reservoir (discontinuous mode) and (2) in continuous mode, directing the product mixture leaving the PBR to a product reservoir. By operating in these two ways and using a simple kinetic model, representative values for the apparent kinetic constants (kX) for each fatty acid (native, Li or odd, M) were obtained. The kinetic model assumes that the rate of incorporation of a fatty acid into TAG per amount of enzyme, rX (mole/(h g lipase)) is proportional to the extent of the deviation from the equilibrium for each fatty acid (i.e., the difference of concentration between the fatty acid in the triacylglycerol and the concentration of the same fatty acid in the triacylglycerol once the equilibrium of the acidolysis reaction is reached). The model allows comparing the two operating modes through the processing intensity, defined as mLt/(V[TG]0) and mL/(q[TG]0), for the discontinuous and continuous operation modes, respectively. In discontinuous mode, ST with 59.5% CA and 9.6% EPA were obtained. In contrast, a ST with 51% CA and 19.6% EPA were obtained when using the continuous operation mode. To enhance the CA incorporation when operating in continuous mode, a two-step acidolysis reaction was performed (third operation mode). This continuous two-step process yields a ST with a 64% CA and a 15% EPA. Finally, after purifying the above ST in a preparative silica gel column, impregnated with boric acid, a ST with 66.9% CA and 19.6% EPA was obtained. The analysis by reverse phase and Ag+ liquid chromatography of the EPA-enriched ST demonstrated that the CA was placed in positions 1 and 3 and the EPA was occupying position 2 of the final ST.

Acids↗

PubMed2005

Chemical and physical properties of butterfat-vegetable oil blend spread prepared with enzymatically transesterified canola oil and caprylic acid.

Structured Lipid was synthesized from canola oil and caprylic acid with sn-1,3 specific lipase from Rhizomucor miehei. Cold spreadable butter was made by blending butterfat with the SL at a weight ratio of 80:20. Its chemical and physical properties were compared with pure butter and butterfat-canola oil 80:20 blend spread. The butterfat-SL blend had lower contents of hypercholesterolemic fatty acids (FAs) and the lowest atherogenic index (AI) as compared to the others. Melting and crystallization behaviors of butterfat-SL blend were similar to those of butterfat-canola oil blend above 0 degrees C. It showed solid fat contents (SFCs) similar to butterfat-canola oil blend but lower than pure butterfat. The butterfat-SL blend was shown to crystallize in the beta' form. There were no differences between the hardness of butterfat-SL blend spread and butterfat-canola oil blend spread. Rheological analysis showed that butterfat-SL blend spread lost its elastic behavior at 5 degrees C, a lower temperature than pure butter.

Butter↗

PubMed2005

Modeling of lipase-catalyzed acidolysis of sesame oil and caprylic Acid by response surface methodology: optimization of reaction conditions by considering both acyl incorporation and migration.

Lipase-catalyzed acidolysis in hexane to produce structured lipids (SLs) from sesame oil and caprylic acid was optimized by considering both total incorporation (Y1) and acyl migration (Y2). Response surface methodology was applied to model Y1 and Y2, respectively, with three reaction parameters: temperature (X1), reaction time (X2), and substrate molar ratio (X3). Well-fitting models for Y1 and Y2 were established after regression analysis with backward elimination and verified by a chi2 test. All factors investigated positively affected Y1. For Y2, X1 showed the greatest positive effect. However, there was no effect of X3. We predicted the levels of Y2 and acyl incorporation into sn-1,3 positions (Y3) based on Y1. The results showed that over the range of ca. 55 mol % of Y1, Y3 started to decrease, and Y2 increased rapidly, suggesting that Y1 should be kept below ca. 55 mol % to prevent decrease in quality and yield of targeted SLs.

Acylation↗

PubMed2006

Characteristics of structured lipid prepared by lipase-catalyzed acidolysis of roasted sesame oil and caprylic acid in a bench-scale continuous packed bed reactor.

Structured lipid (SL) was prepared from roasted sesame oil and caprylic acid (CA) by Rhizomucor miehei lipase-catalyzed acidolysis in a bench-scale continuous packed bed reactor. Total incorporation and acyl migration of CA in the SL were 42.5 and 3.1 mol %, respectively, and the half-life of the lipase was 19.2 days. The SL displayed different physical and chemical properties, less saturated dark brown color, lower viscosity, lower melting and crystallization temperature ranges, higher melting and crystallization enthalpies, higher smoke point, higher saponification value, and lower iodine value, in comparison to those of unmodified sesame oil. The oxidative stability of purified SL was lower than that of sesame oil. There were no differences in the contents of unsaponifiables including tocopherols and phytosterols. However, total sesame lignans content was decreased in SL due to the loss of sesamol when compared to sesame oil. Most of the 70 volatiles present in roasted sesame oil were removed from SL during short-path distillation of SL. These results indicate that the characteristics of SL are different from those of original sesame oil in several aspects except for the contents of tocopherols and phytosterols.

Benzodioxoles↗

PubMed1997

Heparin absorption across the intestine: effects of sodium N-[8-(2-hydroxybenzoyl)amino]caprylate in rat in situ intestinal instillations and in Caco-2 monolayers.

PURPOSE: The effects of sodium N-[8-(2-hydroxybenzoyl)amino]caprylate (SNAC) on heparin intestinal absorption were studied using rat in situ ileal and colonic instillations and Caco-2 monolayers. METHODS: The flux of heparin was tested in the following groups: i) heparin alone, ii) heparin in the presence of SNAC, iii) heparin in the presence of propylene glycol (PG), and iv) heparin in the presence of SNAC and PG. Heparin absorption was measured by the APTT assay in the in situ models and by the anti-Factor Xa assay in Caco-2. SNAC and [3H]-SNAC fluxes were assessed by HPLC and by scintillation counting respectively. RESULTS: In the rat ileal and colonic in situ instillations SNAC (17-35 mg) promoted heparin absorption in the presence and absence of PG without damaging the tissue. PG alone did not alter heparin absorption in situ, but it amplified the effect of SNAC. In Caco-2, enhanced heparin fluxes were variable in the presence of non-cytotoxic concentrations of SNAC (< 10 mg/ml) and these effects could not be discriminated from those of PG. Papp values for SNAC alone were 2.2 x 10(-5) cm/s and 2.0 x 10(-5) cm/s in the mucosal-to-serosal and serosal-to-mucosal directions respectively, suggesting a substantial passive transcellular flux. Transport of SNAC was significantly reduced in the presence of heparin and/or PG, perhaps indicating physical association between the agents. CONCLUSIONS: SNAC augmented heparin absorption alone and in combination with PG in the rat in situ models without causing toxicity. Caco-2 had limitations for testing increased heparin absorption due to cytotoxic effects of high concentrations of SNAC and PG. However, SNAC itself was well absorbed across Caco-2 and its mechanism of permeation was determined.

Animals↗