A new, rapid online-HPTLC method for evaluation of DPPH reduction with ascorbic acid

Photoacoustic Spectroscopy in the Characterization of Bread with Turmeric Addition

“…Muhammad et al (2019) used UVvisible spectrophotometry to measure the absorbance at 760 nm to estimate the total phenolic content of the cocoa powder, the colloidal cinnamon nanoparticles and the chocolate beverage, applying the Folin -Ciocalteu method. Regard, antioxidant activity, various method has been reported, among them, DPPH savenging assay that is the widely used one (De and Nariya, 2013;Yamaguchi et al, 1998;Krishnaswamy, 2013). This method has been applied to determine the antioxidant activity of Grape (Vitus vinifera), lemon (Citrus limon), pomegranate (Punica granatum), orange (Citrus sinensis), hemp (C. sativa) seed, seaweeds, Golden oyster mushroom (Pleurotus cornucopiae), samples of extrudates and raw flours for corn and yams, among much other food (Paari et al, 2012;Krishnaswamy et al, 2013;Teh et al, 2014;Devi et al, 2008;Jo et al, 2013).…”

“…The measure of antioxidant activity has been obtained from obtaining optical absorption measurements of the extracts of samples obtained around 520 nm (517 and 515 nm). Although has also been obtained at optical absorption measurement of 330 nm (De and Nariya, 2013). Chemical and reagents are required to carry out these measurements (Sellami et al, 2012); methods that could avoid the use of these have been reported in the literature, such as is the case of Photoacoustic spectroscopy (PAS) technique.…”