Chocolate is considered as both caloric and functional food. Its nutritional properties may be improved by addition of fiber; however, this may reduce polyphenols content. The aim of this research was to determine the influence of cocoa shell addition (as a source of fiber) and its combination with different ingredients (cocoa butter equivalents (CBE), emulsifiers, dairy ingredients) on polyphenols of dark and milk chocolates. Total polyphenol (TPC) and total flavonoid (TFC) contents were determined spectrophotometrically, identification and quantification of individual compounds by high pressure liquid chromatography and antioxidant capacity by ferric reducing antioxidant power (FRAP) assay. Results showed that even though addition of cocoa shell to chocolate results in reduced contents of TPC, TFC, and individual compounds, it is not significant compared to ones reported by other authors for commercial chocolates. Other ingredients influence determined values for all investigated parameters; however, additional research is needed to reveal exact mechanisms and implications.
Pileća mast podliježe oksidacijskom kvarenju tijekom proizvodnje, skladištenja i toplinske obrade. U ovom radu istraživan je utjecaj dodatka prirodnih i sintetskih antioksidanasa (ekstrakt zelenog čaja, ekstrakt ružmarina, ekstrakt kadulje, ekstrakt rtanjskog čaja, alfa tokoferol, mješavina tokoferola, TBHQ (terc-butilhidrokinon), kofeinska kiselina i ružmarinska kiselina) na promjenu oksidacijske stabilnosti pileće masti. Oksidacijska stabilnost masti, sa i bez dodanog antioksidansa, ispitivana je primjenom Schaal Oven testa. Rezultati testa prikazani su kao vrijednost peroksidnog broja nakon određenog vremena držanja masti pri temperaturi 63 °C. Rezultati istraživanja pokazuju da dodani antioksidansi uspješno stabiliziraju pileću mast, osim α-tokoferola i mješavine tokoferola. Od prirodnih antioksidanasa najveću antioksidacijsku aktivnost u pilećoj masti ima ekstrakt ružmarina. Postigao je najveću efikasnost zaštite od oksidacije, u odnosu na druge ispitivane antioksidanse. Ekstrakti zelenog čaja, rtanjskog čaja i kadulje imaju podjednaku razinu zaštite masti. Sintetski antioksidans TBHQ uspješno je povećao stabilnost pileće masti, a kofeinska kiselina i ružmarinska kiselina su manje efikasane.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.