ABSTRACT
ABSTRACT The aim of this study was to determine the composition and antioxidant potential of leaves of a new variety of Stevia rebaudiana (Stevia UEM-13). Stevia leaves of UEM-13 contain rebaudioside A as the main glycoside, while most wild Stevia plants contain stevioside. Furthermore can be multiplied by seed, which reduces the cost of plant culture techniques as other clonal varieties are multiplied by buds, requiring sophisticated and expensive seedling production systems. Ethanol and methanol were used in the extraction to determine the bioactive compounds. The methanolic extract was fractionated sequentially with hexane, chloroform, ethyl acetate and isobutanol, and the highest concentration of phenolic compounds and flavonoids was obtained in the ethyl acetate fraction (524.20 mg galic acid equivalent/g; 380.62 µg quercetin equivalent/g). The glycoside content varied greatly among the fractions (0.5% - 65.3%). Higher antioxidant potential was found in the methanol extract and the ethyl acetate fraction with 93.5% and 97.32%, respectively. In addition to being an excellent source for obtaining of extracts rich in glycoside, this new variety can also be used as raw material for the production of extracts or fractions with a significant amount of antioxidant activity and potential to be used as additives in food.
Subject(s)
Phenols/chemistry , Plant Extracts/chemistry , Plant Leaves/chemistry , Stevia/chemistry , Glycosides/chemistry , Antioxidants/chemistry , Phenols/isolation & purification , Plant Extracts/isolation & purification , Stevia/classification , Glycosides/isolation & purification , Antioxidants/isolation & purificationABSTRACT
A busca por alimentos industrializados com ingredientes mais saudáveis tem aumentado. O óleo de coco tem alto teor de ácidos graxos saturados e com isso pode ser utilizado em substituição a outros óleos vegetais. Assim, o presente estudo objetivou a elaboração de uma maionese com a utilização de óleo de coco. Foram elaboradas duas formulações diferentes, uma com apenas óleo de coco e outra com parte de azeite de oliva, em igual proporção, sendo as duas formulações temperadas com salsa, cebolinha e alho. Realizaram-se análises físico-químicas e instrumentais (cor e textura) a fim de verificar as características do produto final, os dados foram avaliados por Anova e Teste de Tukey (p<0,05). Houve diferença significativa entre as amostras nas análises acidez, estabilidade das emulsões, textura e cor (a* e b*). Apenas o pH e a luminosidade (L) não diferiram entresi estatisticamente. Assim, pode-se concluir que os produtos obtidos apresentam qualidade físico-química e ainda que a utilização de óleo de coco para a elaboração de maioneses pode ser uma forma alternativa de ingestão deste tipo de ácido graxo e seus componentes propiciando benefícios à saúde.
The demand for healthy processed foods has increasing. The coconut oil has high content of saturated fatty acids and therefore, can be utilized to replacement for others vegetable oils. This present study aimed the formulation an oil coconut mayonnaise. Were produced two different elaborations, one with only coconut oil and other with coconut/olive oil in equal proportions, and the two formulations flavor with parsley, chive and garlic. Were analyzed the physical and chemical and instrumental (color and texture) in order to examine the characteristics of the final product, data were evaluated by ANOVA and Tukey's test (p<0,05). There was significant difference between the sample in acid analysis, stability of emulsions, texture and color (a* and b*). Just the pH and luminosity (L) did not differ statistically. Thus, it could be conclude that the final products presented physical and chemical quality and that the using coconut oil for the formulation an oil coconut mayonnaise could be alternative intake this fatty acid and their components providing health benefits.