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Screening of traditional South African leafy vegetables for specific anti-nutritional factors before and after processing Ciênc. Tecnol. Aliment.
ESSACK,Humaira; ODHAV,Bharti; MELLEM,John Jason.
Abstract This study investigated the effect of processing on anti-nutritional factors of thirteen traditional leafy vegetables collected in Kwa Zulu-Natal, South Africa. The aim was to determine whether processing reduced anti-nutrient levels of leafy vegetables. The vegetables were boiled in a plant-to-distilled water ratio of 1:4 (w/v) at 97 °C for a time period of 5 and 15 min. The vegetables studied were: Amaranthus dubius, Amaranthus hybridus, Asystasia gangetica, Bidens pilosa, Ceratotheca triloba, Chenopodium album, Emex australis, Galinsoga parviflora, Guilleminea densa, Momordica balsamina, Oxygonum sinuatum, Physalis viscosa and Solanum nigrum. From this study, it was determined that non processed samples contained anti-nutrients such as tannins,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Traditional leafy vegetables; Tannins; Phytic acid; Alkaloid; Oxalic acid; Cyanogenic glycoside.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612017000300462
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Stability and degradation kinetics of crude anthocyanin extracts from H. sabdariffa Ciênc. Tecnol. Aliment.
SIPAHLI,Shivon; MOHANLALL,Viresh; MELLEM,John Jason.
Abstract Hibiscus sabdariffa is an under-utilized plant that has reported to have great potential in the food industry. The vibrant red pigment from the calyces indicate a source of anthocyanins. Anthocyanins would make ideal natural food colourants with additional nutritional benefits however stability is a hindering factor. Stability studies were the main focus of this study. Crude anthocyanins were extracted using four different solvent systems. The crude extracts were analysed under the following parameters; heat (50 and 80 °C), light (darkness and 20 W light) and pH (pH 1-9) stability. Degradation kinetic studies were done on thermally treated samples. Radical scavenging ability was thereafter calculated. Anthocyanidins were identified and quantified...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Anthocyanins; Degradation kinetics; Folin-Ciocalteu; Hibiscus sabdariffa.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612017000200209
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