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Reaction Kinetics in Food Systems
Published in Dennis R. Heldman, Daryl B. Lund, Cristina M. Sabliov, Handbook of Food Engineering, 2018
Ricardo Villota, James G. Hawkes
Carotenoids may be complexed with sugars, such as di-gentiobiose in α-crocin, the main pigment in saffron. Proteins may also be complexed with carotenoids, such as in the case with astaxanthin, commonly found in crustacea such as crab and lobster. The natural bluish-green color of these crustaceans is due to the astaxanthin-protein complex, which upon heating results in denaturation of the protein portion of the complex giving a reddish-orange color.
Evaluation of Crocin as green corrosion inhibitor for aluminum in NaCl solution
Published in Chemical Engineering Communications, 2023
Paraskevi Pantazopoulou, Sofia Kalogeropoulou, Stamatina Theohari, Eleftherios Papamichalis, Demeter Tzeli
In the present study Crocin (C44H64O24), which is a nontoxic substance of plant origin contained in the stems of the plant Crocus Sativus, with no impact on human life and the environment, is investigated against the corrosion of the commercial pure aluminum alloy AA1050 in the aggressive environment of chloride ions at room temperature. Crocin is one of the few natural carotenoids easily soluble in water, that has been reported not only as coloring matter in food and textile industry but also as an effective antioxidant, anticarcinogenic and neuroprotective agent in drugs and nutritional supplements (Bathaie et al. 2014; Cerdá-Bernad et al. 2022; Soror 2013; Rahaiee et al. 2015; Tsangaraki-Kaplanoglou et al. 1989; Yan et al. 2021). Its reactivity is attributed to the presence of active centers in its chemical structure. Therefore, Crocin is expected to be a promising eco-friendly corrosion inhibitor. Potentiodynamic electrochemical techniques, mass loss measurements and Scanning Electron Microscopy were employed to elucidate the action of Crocin toward the corrosion of aluminum. Experimental findings were completed and verified using computational methods, i.e., density functional theory (DFT), semiempirical PM6, molecular mechanics (MM) simulations and multiscaling ONIOM (DFT/PM6) and ONIOM (DFT/MM) approaches.