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Open AccessArticle

Extraction and Analysis by HPLC-DAD of Carotenoids in Human Faeces from Spanish Adults

1
Facultad de Farmacia, Universidad Complutense de Madrid, 28040 Madrid, Spain
2
Institute of Food Science, Technology and Nutrition (ICTAN-CSIC), 28040 Madrid, Spain
3
Facultad de Ciencias Experimentales, Universidad Francisco de Vitoria, 28223 Pozuelo de Alarcón (Madrid), Spain
*
Author to whom correspondence should be addressed.
Antioxidants 2020, 9(6), 484; https://doi.org/10.3390/antiox9060484
Received: 27 April 2020 / Revised: 29 May 2020 / Accepted: 1 June 2020 / Published: 3 June 2020
(This article belongs to the Section Health Outcomes of Antioxidants and Oxidative Stress)
Carotenoids are bioactive compounds with widely accepted health benefits. Their quantification in human faeces can be a useful non-invasive approach to assess their bioavailability. Identification and quantification of major dietary carotenoids in human faeces was the aim of the present study. Faeces and dietary intake were obtained from 101 healthy adults (45–65 years). Carotenoid concentrations were determined by HPLC in faeces and by 3-day food records in dietary intake. Carotenoids quantified in faeces (μg/g dry weight, median) were: β-carotene (39.5), lycopene (20), lutein (17.5), phytoene (11.4), zeaxanthin (6.3), β-cryptoxanthin (4.5), phytofluene (2.9). α-carotene (5.3) and violaxanthin were found 75.5% and 7.1% of the faeces. The carotenoids found in the highest concentrations corresponded to the ones consumed in the greatest amounts (μg/d): lycopene (13,146), phytoene (2697), β-carotene (1812), lutein+zeaxanthin (1148). Carotenoid concentration in faeces and in dietary intake showed correlation for the total non-provitamin A carotenoids (r = 0.302; p = 0.003), phytoene (r = 0.339; p = 0.001), phytofluene (r = 0.279; p = 0.005), lycopene (0.223; p = 0.027), lutein+zeaxanthin (r = 0.291; p = 0.04) and β-cryptoxanthin (r = 0.323; p = 0.001). A high proportion of dietary carotenoids, especially those with provitamin A activity and some of their isomers, reach the large intestine, suggesting a low bioavailability of their intact forms. View Full-Text
Keywords: carotenes; xanthophylls; diet; stool; bioavailability; middle-age people carotenes; xanthophylls; diet; stool; bioavailability; middle-age people
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Rodríguez-Rodríguez, E.; Beltrán-de-Miguel, B.; Samaniego-Aguilar, K.X.; Sánchez-Prieto, M.; Estévez-Santiago, R.; Olmedilla-Alonso, B. Extraction and Analysis by HPLC-DAD of Carotenoids in Human Faeces from Spanish Adults. Antioxidants 2020, 9, 484.

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