2026-06-28T10:28:24Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/925202024-07-12T23:46:58Zcom_20.500.14352_14col_20.500.14352_15

Vilela García, Diana González, María Cristina Escarpa, Alberto 2024-01-11T12:09:31Z 2024-01-11T12:09:31Z 2012 1618-2642 10.1007/s00216-012-6084-6 https://hdl.handle.net/20.500.14352/92520 1618-2650 https://doi.org/10.1007/s00216-012-6084-6 In this work it was demonstrated that sample endogenous polyphenols are selectively driving the gold-nanoparticle (AuNPs)-formation process when representative food samples were used as natural sources of reducing compounds. The process of AuNPs formation was characterized by UV–visible spectroscopy and was described by a sigmoidal curve (R 2 ≥ 0.990) which gave information about the polyphenol concentration at which the localized surface plasmon resonance (LSPR) absorption reached its half-value, X50c, and about AuNPs production per polyphenol concentration unit, K AuNPs. The behavior of phenolic acids was different, with lower X 50c and higher K AuNPs values than flavonoids. For the food samples tea, apple, pear, wine, and honey X50c values were 0.22, 7.3, 11.5, 20.4, 30.3, and 53.5 (mg mL−1) and K AuNPs values were 28.7, 0.70, 0.60, 0.20, 0.14, and 0.10 (mg−1 mL), respectively. Excellent correlation between K AuNPs and total phenolics (TP) was obtained (r = 0.98, p-value < 0.05), implying K AuNPs is a novel marker for evaluation of food sample antioxidant capacity in vitro. The K AuNPs values of samples indicated their antioxidant capacity was in the order: tea > apple > pear > wine > honey. The reproducibility of the AuNPs formation approach was excellent, not only for polyphenol standards (RSD < 6 % for X50c and RSD < 11 % for K AuNPs) but also for food samples (RSD < 9 % for X50c and RSD < 15 % for K AuNPs). Transmission electronic microscopy (TEM) enabled confirmation of the formation of stabilized Au-nanospheres from endogenous polyphenols with very well-defined sizes under 20 nm diameter for all the food samples investigated. eng http://creativecommons.org/licenses/by-nc-nd/4.0/ restricted access Attribution-NonCommercial-NoDerivatives 4.0 International Gold-nanosphere formation using food sample endogenous polyphenols for in-vitro assessment of antioxidant capacity journal article