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Our results arein agreement with study of Cortes, Salinas, San Martín-Martinez,and Martínez-Bustos (2006), who analyzed the effect of pH valueby different concentrations of calcium hydroxide on anthocyaninsstability after nixtamalization. However, combined with the temperature,the leavening agent increased solubility of ferulic and pcoumaricacids (Table 3). The study of Friedman and Jürgens (2000)demonstrates that the susceptibility of different plant phenoliccompounds to pH strongly depends on the phenol structure. Accordingto results of these authors, ferulic acid with a single OHgroup appears to be stable at high pH, presumably because itcannot form quinone oxidation products. The color of cookie doughwith 1.25 g/100 g of ammonium bicarbonatewas almost green withthe CIE L*, a* and b* values of 21.69, 5.63 and 9.01, respectively.After baking, cookies had more than twice higher the L* and b*values and pale green color on the surface (Fig. 1) Light color ofcookies was the result of a low baking temperature, as well as theabsence of high fructose corn syrup and sodium chloride, whichenhance Maillard reaction and caramelization.The results in Table 5 show the effect of applied baking conditions,as well as various pH values on total antioxidant capacityof corn cookies. It was evident that the phenolic compounds incorn flours contributed to its antioxidant capacity. Among usedraw materials the dark-red popping corn flour had the highestantioxidant capacity (44.04 mmol Trolox/kg). Baking treatmentsincreased antioxidant capacity of control cookies, on flour basis.The increase in total antioxidant capacity of control cookies preparedfrom dark-red popping corn, blue popping corn and bluestandardcorn dough with slightly alkaline pH values could bepartially explained by an increased release of bound phenolics. Theresults of Zilic et al. (2014) showed that wheat grain phenoliccompounds in the bound form, as dominant, exert lower antioxidantcapacity in comparison with its hydrolysed and isolated freeforms. Despite this, our results show that the Maillard reaction,which takes place in a higher rate under alkaline conditions, hadcrucial influence on the increased antioxidant capacity of control
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