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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 53 for “"Beta-carotene"”.
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Impact of Dietary Composition and Beta-Carotene Isomeric Structure on Bioconversion of Beta-Carotene to Vitamin a in Gerbils
In conclusion, betaC bioconversion to VA was independently and adversely affected by consumption of low dietary fat and citrus pectin. 9-Cis betaC was less and 13cbetaC was more than the currently assigned retinol equivalency of 50% of atbetaC. Thus, the actual contribution of betaC to the VA …
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Dairy ingredients-based emulsions and beta-carotene delivery
… representative lipophilic bioactive nutrient, β-carotene, was encapsulated into these model emulsions. Emulsion properties, and the in vitro digestion, release, bioaccessibility and absorption by enterocytes of encapsulated βcarotene were investigated. Re-dispersible dry forms of these model …
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Absorption, transport, and subcellular distribution of beta-carotene
The search for possible in vivo functions of carotenoids has been complicated by the fact that answers to many basic questions concerning carotenoid absorption, transport, and subcellular distribution are not well defined.
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The relationship of dietary beta-carotene intake and serum beta- carotene levels to the development of oral lesions in smokeless tobacco users
… to assess the relationship of dietary and serum beta-carotene to the development of oral lesions in smokeless tobacco users. Eighty eight smokeless tobacco users without oral lesions and 18 with lesions participated in the study. Dietary intake of beta-carotene, personal health habits and …
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Effect of Chronic Ethanol Consumption on Vitamin a Metabolism (beta-Carotene, Rats)
… This occurred when either retinyl acetate or (beta)-carotene were the dietary source of vitamin A. In comparison to rats fed a moderate fat diet, a greater decrease of liver vitamin A levels occurred in ethanol-fed rats on a high fat diet. Decreased hepatic vitamin A storage resulted despite …
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Investigations of the action of vitamin A and beta carotene on reproductive performance in pigs
The reproductive efficiency of the breeding sow is a major limitation to profitability in the pork industry. Investigations on the treatment of sows with retinol proprionate or retinol palmitate and their effect on reproductive function were undertaken. The objectives of this work were to …
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Effects of oil types and beta-carotene in repeated deep-fat frying of French fries
… This prompted the study of the effect of β-carotene as an antioxidant in deep-fat frying. β-carotene was added to palm olein at a concentration equivalent to the total carotenoids in crude palm oil. With respect to p-Anisidine value, the antioxidant contribution of carotenoids was negligible …
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Photoprotective role of beta -carotene and antioxidant enzymes: A shield against ultraviolet damage in Dunaliella bardawil
… accumulate massive quantities of inter-thylakoid beta-carotene during exposure to stress or high irradiances of photosynthetically active radiation (PAR: 400-700 nm) while Dunaliella salina (UTEX 200) lacks this ability. Cells were cultured in two irradiances (150 and 35 mumol photons …
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The role of Beta carotene in dairy cattle reproduction and its in vivo effect on corpus luteum function
To determine the effects of Beta carotene (B) on reproduction and to define better the role of metabolic hormones during early lactation, seventy-eight Holsteins were alternately assigned at calving to either supplementation with 600 mg synthetic B daily (BC) from day 30 through day 90 of lactation …
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Release, Stability and Functionality of Nanodelivered Hydrophobic (Lutein and Beta-Carotene) and Hydrophilic (Folic Acid) Antioxidants Using Zein Nanoparticles
… protecting antioxidant activity of entrapped -carotene in the presence of milk as food matrix under simulated gastrointestinal environments. Lastly, folic acid modified zein nanoparticles sustained the release of folic acid, showed a good biocompatibility, and diminished the toxic effect of …
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Evaluation of the pre-ruminant calf as a model for the study of beta-carotene metabolism in the human
… of the absorption, transport and metabolism of $\beta$-carotene in the human. The pattern of serum appearance and disappearance of $\beta$-carotene following oral dosing was favorably compared to humans, and kinetic analysis of serum curves resulted in a serum elimination constant (0.006/h) which …
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The Influence of Beta-Carotene and Lycopene on Human Prostate Tumor Cells in Vitro and Human Prostate Tumors in Mice
An overall goal of this research was to investigate the influence of tomatoes, BC and lycopene on prostate carcinogenesis under biologically relevant conditions. To this end, a novel approach for the delivery of carotenoids to cells in culture and a murine model were developed. There was no …
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The effect of beta-carotene vitamin E, and vitamin C supplementation upon work capacity during a protocol of arm curl exercise using the Biodex dyanamometer
… the placebo or antioxidant mixture capsules (beta-carotene, vitamin C, vitamin E). There was a 28 day washout period between the two supplemental stages. Subjects were tested during each stage for an acute effect (one day of supplementation) and chronic effect (twenty-eight days of …
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The consumption levels of fruits and vegetables and antioxidants of college students
… levels of antioxidants vitamin C, vitamin E, and beta carotene and the average number of servings of fruits and vegetables consumed were determined for 217 college students (95 males and 122 females) enrolled in an introductory nutrition class. Nutritional analysis was carried out using the …
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Antioxidants and natural anti-cancer agents in the large bowel and the influence of intestinal microbial fermentation.
… (anaerobes) a protective effect was found for Beta-carotene (P<0.01) with oxygen, but there was NSD in the growth of aerobes. Beta-carotene mitigated the detrimental effects of increased H2O2 production associated with exposure to oxygen. H2O2 production decreased after the addition of …
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Retention of Nutrients and Phytochemicals in Fresh and Processed Broccoli
… affected concentrations of ascorbic acid, $\beta$-carotene, sulforaphane (SF), sulforaphane nitrile (SFN), cyanohydroxybutene (CHB), iberin (I) and iberin nitrile (IN) in fresh and frozen broccoli. The mean initial concentration of ascorbic acid decreased during fresh storage by 13.0% on a …
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PHOTOADAPTIVE RESPONSES IN THE TROPICAL BROWN SEAWEED, LOBOPHORA VARIEGATA (LAMOUR) WOMERS
… when expressed in terms of thallus area. The beta-carotene content of L. variegata was much greater in shallow than in deep-water samples regardless of the pigment units employed. Experimental reduction of the light regime of the shallow population, produced a significant decrease in …
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An investigation of the association of colonic adenomatous polyps and nutritional status of retinol and carotene
… was evaluated that lower dietary consumption of carotene or retinol or lower serum levels of beta carotene or retinol are associated with development of colonic adenomas. To evaluate this hypothesis, selected patients who were to undergo colonoscopy to determine polyps status were asked to …
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Genetic dissection of carotenoid concentration and compositional traits in maize grain
… xanthophyll carotenoids, as well as alpha-carotene, beta-carotene and beta-cryptoxanthin, which are proVitamin A carotenoids. While phenotypic sampling and recombination across diverse maize germplasm has been successful, response to phenotypic selection has not been large enough to satisfy …
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Isolation and characterization of carotenoproteins in higher plant systems
… for the isolation of intact $\alpha$- and $\beta$-carotene binding carotenoprotein from carrot chromoplasts. Initial attempts to isolate and purify this protein from spinach chloroplasts was unsuccessful because of contaminating chlorophyll and chlorophyll proteins.
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