Dream Pharm Mother Nature's Timesless Recipes
Lutein


herbal formula to ward of hair loss and promote hair growth



References online: Lutein




Lutein and Eye Nutrition Center: Home| Lutein and Eye Nutrition Center: What is Lutein ?| Lutein and Eye Nutrition Center: What does Lutein do for us ?| Lutein and Eye Nutrition Center: Are we taking enough lutein ?| Lutein and Eye Nutrition Center: Are there other eye nutritions than Lutein ?| Lutein and Eye Nutrition Center: Research Reports: Role of Carotenoids| Lutein and Eye Nutrition Center: Research Reports: Serum lutein and carotenoid level in response to taking dietary carotenoids| Lutein and Eye Nutrition Center: Research Reports: Lutein and Lung Function| Lutein and Eye Nutrition Center: Research Reports: Lutein and Congestive Heart Failure| Lutein and Eye Nutrition Center: Research Reports: Lutein, Lycopene, and Prostate Cancer| Lutein and Eye Nutrition Center: Research Reports: Lutein, carotenoids, and breast cancer| Lutein and Skin Cancer| Lutein: General Information Page| Lutein and Age-related Macular Degeneration| Lutein improves visual function in age-related cataracts patients| Lutein may be a nutritional factor for protecting lens in age-related cataracts patients| Intakes of antioxidants in coffee, wine, and vegetables are correlated with plasma carotenoids in humans.| Plasma Antioxidant Status, Immunoglobulin G Oxidation and Lipid Peroxidation in Demented Patients: Relevance to Alzheimer Disease and Vascular Dementia.| Photo-oxidative stress in a xanthophyll-deficient mutant of Chlamydomonas.| Application of tristimulus colorimetry to estimate the carotenoids content in ultrafrozen orange juices.| Macular pigment: quantitative analysis on autofluorescence images.| QTL and candidate genes phytoene synthase and zeta-carotene desaturase associated with the accumulation of carotenoids in maize.| Thermal processing of vegetables increases cis isomers of lutein and zeaxanthin.| Serum vitamins and the subsequent risk of bladder cancer.| The relationship between dietary carotenoids and prostate cancer risk in Southeast Chinese men.| Macular pigments: their characteristics and putative role.| The effect of an acute phase response on tissue carotenoid levels of growing chickens (Gallus gallus domesticus).| Resonance Raman measurement of macular carotenoids in retinal, choroidal, and macular dystrophies.| Assessment of carotenoid bioavailability of whole foods using a Caco-2 cell culture model coupled with an in vitro digestion.| Lutein, zeaxanthin, macular pigment, and visual function in adult cystic fibrosis patients.| Serum Carotenoid and Retinol Levels during Childhood Infections.| Chlorophyll, carotenoids and the activity of the xanthophyll cycle.| De-epoxidation of violaxanthin in light-harvesting complex I proteins.| Carotenogenesis during tuber development and storage in potato.

J Agric Food Chem. 2003 Dec 3;51(25):7266-70.
Application of tristimulus colorimetry to estimate the carotenoids content in ultrafrozen orange juices.

Melendez-Martinez AJ, Vicario IM, Heredia FJ.

Department of Nutrition and Food Science, Faculty of Pharmacy, University of Seville, 41012 Seville, Spain.

Tristimulus Colorimetry was applied to characterize the color of Valencia late orange juices. Color measurements were made against white background and black background. The profile of the main carotenoids related to the color of the juices was determined by HPLC. Significant correlations (p < 0.05) between b*, Cab* and h(ab) and the content of beta-cryptoxanthin, lutein + zeaxanthin and beta-carotene were found. The correlations between the color parameters L*, a*, b*, Cab* and h(ab) and the carotenoids content were also explored by partial least squares. The results obtained have shown that it is possible to obtain equations, by means of multiple regression models, which allow the determination of the individual carotenoid levels from the CIELAB color parameters, with R2 values always over 0.9. In this sense, equations have been proposed to calculate the retinol equivalents (1 RE = 1 microgram retinol = 12 micrograms beta-carotene = 24 micrograms alpha-carotene = 24 micrograms beta-cryptoxanthin) of the orange juice analyzed as a function of the color parameters calculated from measurement made against white and black backgrounds. The average RE per liter of juice obtained by HPLC was 51.07 +/- 18.89, whereas employing these equations, average RE values obtained were 51.16 +/- 1.36 and 51.21 +/- 1.70 for white background and black background, respectively.

lutein online source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=14640568&dopt=Abstract lutein

rz.uni-potsdam.de

BACKGROUND: Deficiencies of vitamin A and its precursors, the carotenoids are common problems in developing countries. Plasma levels of these components are used as biomarkers of their availability. The study was conducted to evaluate whether blood plasma obtained from capillaries can be compared with plasma obtained from venous blood with regard to its levels of retinol, carotenoids and alpha-tocopherol and secondly to apply this technique to evaluate the levels of these components in children in a region with possible deficiencies. METHODS: The survey was conducted in a region of Laos in 81 children (age 35 to 59 months). Dietary intake was assessed by a questionnaire. Retinol, carotenoids and alpha-tocopherol were determined by HPLC. Blood plasma was obtained either from capillary blood collected into microcapillaries and for reasons of methodological comparison in 14 adults from venous blood. RESULTS: The comparison between capillary and venous blood revealed that all components except zeaxanthin were 9 - 23 % higher in plasma obtained from capillary blood. Results in Laotian children showed that all investigated components except retinol were significantly lower (P < 0.01) compared to European children of slightly older age. Contrary to children in Europe, most components were significantly lower in boys compared to girls. In children from Laos, lutein was the dominant carotenoid, while in children in Europe, beta-carotene was dominant. Within the Laotian children only a few differences were observed between stunted and non-stunted children and between children from lowland areas and high land areas. CONCLUSIONS: Results show that in consideration of slightly lower levels than in venous blood, capillary blood can be used to evaluate retinol, carotenoids and alpha-tocopherol as biomarkers of intake or status and to evaluate the possible effect of diet on absolute and relative carotenoid composition in children from Europe and Laos. Observed sex related differences might not be related to diet and would need further investigation.

lutein online source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=14641922&dopt=Abstract lutein



Clin Chem. 2003 Nov 13 [Epub ahead of print]
Simultaneous Determination of Tocotrienols, Tocopherols, Retinol, and Major Carotenoids in Human Plasma.

Lee BL, New AL, Ong CN.

Department of Community, Occupational and Family Medicine, Faculty of Medicine, National University of Singapore, Singapore 117597.

BACKGROUND: Epidemiologic evidence suggests that the concentrations of antioxidant vitamins in human plasma may play an important role in numerous chronic diseases, such as cancer and cardiovascular disease. However, methods for simultaneous measurement of these antioxidants are scarce. We developed and validated a new HPLC method for simultaneous determination of these vitamers in human plasma that uses a novel column-switching approach. METHODS: The new method uses liquid-liquid extraction and isocratic separation with two monomeric C18 columns maintained at 35 and 4 degrees C coupled with ultraviolet-visible and fluorometric detection. This method could separate 14 vitamers and 3 internal standards within 27 min. No additional modifier was required; the mobile phase was acetonitrile-methanol (65:35 by volume), and the flow rate was 1 mL/min. RESULTS: For photodiode array detection, the detection limits (signal-to-noise ratio >3) were 0.02 mg/L for beta-carotene, lutein, zeaxanthin, and canthaxanthin; 0.01 mg/L for all-trans-retinol, beta-cryptoxanthin, alpha-carotene, and lycopene; and 0.1 mg/L for all tocopherols and tocotrienols. The detection limit was at least 25-fold lower (0.004 mg/L) when fluorometry was used for measurement of delta-, gamma-, and alpha-tocotrienol and delta-tocopherol compared with ultraviolet detection. The recovery and imprecision of the assay were generally >90% and <10%, respectively. CONCLUSIONS: This new method separates a wide range of fat-soluble antioxidant vitamins in human plasma, including six carotenoids, three isoforms of tocotrienols and tocopherols (delta-, gamma-, and alpha-), and all-trans-retinol. The overall findings suggest that our method is faster, more sensitive, and more comprehensive than existing methods.Copyright 2003 American Association for Clinical Chemistry

lutein online source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=14633921&dopt=Abstract lutein




Clin Chem. 2003 Dec;49(12):2056-66.
Simultaneous determination of tocotrienols, tocopherols, retinol, and major carotenoids in human plasma.

Lee BL, New AL, Ong CN.

Department of Community, Occupational and Family Medicine, Faculty of Medicine, National University of Singapore, Singapore 117597.

BACKGROUND: Epidemiologic evidence suggests that the concentrations of antioxidant vitamins in human plasma may play an important role in numerous chronic diseases, such as cancer and cardiovascular disease. However, methods for simultaneous measurement of these antioxidants are scarce. We developed and validated a new HPLC method for simultaneous determination of these vitamers in human plasma that uses a novel column-switching approach. METHODS: The new method uses liquid-liquid extraction and isocratic separation with two monomeric C(18) columns maintained at 35 and 4 degrees C coupled with ultraviolet-visible and fluorometric detection. This method could separate 14 vitamers and 3 internal standards within 27 min. No additional modifier was required; the mobile phase was acetonitrile-methanol (65:35 by volume), and the flow rate was 1 mL/min. RESULTS: For photodiode array detection, the detection limits (signal-to-noise ratio >3) were 0.02 mg/L for beta-carotene, lutein, zeaxanthin, and canthaxanthin; 0.01 mg/L for all-trans-retinol, beta-cryptoxanthin, alpha-carotene, and lycopene; and 0.1 mg/L for all tocopherols and tocotrienols. The detection limit was at least 25-fold lower (0.004 mg/L) when fluorometry was used for measurement of delta-, gamma-, and alpha-tocotrienol and delta-tocopherol compared with ultraviolet detection. The recovery and imprecision of the assay were generally >90% and <10%, respectively. CONCLUSIONS: This new method separates a wide range of fat-soluble antioxidant vitamins in human plasma, including six carotenoids, three isoforms of tocotrienols and tocopherols (delta-, gamma-, and alpha-), and all-trans-retinol. The overall findings suggest that our method is faster, more sensitive, and more comprehensive than existing methods.

lutein online source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=14633878&dopt=Abstract lutein







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