68 research outputs found

    Antioxidant Activity of the Phenolic Leaf Extracts from Monechma ciliatum in Stabilization of Corn Oil

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    The total phenolic content and the antioxidan potential of methanolic extract (ME), ethyl acetate extract (EAE), and hexane extract (HE) from Monechma ciliatum leaves (MCL) were evaluated. The Folin-Ciocalteu, b-carotene bleaching, the 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging and the accelerated oxidation methods were used for evaluation. Both the extraction yield and the antioxidant activity (AOA) were strongly dependent on the solvent. Among the extracts, ME exhibited highest total phenolic compounds (TPC) and IC50 values for DPPH, followed by EAE and HE, respectively. Peroxide value (PV), anisidine value (AV) conjugated dienes (CD), and thiobarbituric acid reactive substances (TBARS) were taken as the parameters for evaluation of stabilization efficacy of MCL extracts and results revealed MCL to be a potent antioxidant for the stabilization of corn oil. As a general trend, increased AOA was observed for increased extract concentration. The predominant phenolic compounds identified by HPLC-DAD in MCL extracts were p-coumaric acid, vanillin and ferulic acid

    Antioxidant Activity of the Phenolic Leaf Extracts from Monechma ciliatum in Stabilization of Corn Oil

    Get PDF
    The total phenolic content and the antioxidan potential of methanolic extract (ME), ethyl acetate extract (EAE), and hexane extract (HE) from Monechma ciliatum leaves (MCL) were evaluated. The Folin-Ciocalteu, b-carotene bleaching, the 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging and the accelerated oxidation methods were used for evaluation. Both the extraction yield and the antioxidant activity (AOA) were strongly dependent on the solvent. Among the extracts, ME exhibited highest total phenolic compounds (TPC) and IC50 values for DPPH, followed by EAE and HE, respectively. Peroxide value (PV), anisidine value (AV) conjugated dienes (CD), and thiobarbituric acid reactive substances (TBARS) were taken as the parameters for evaluation of stabilization efficacy of MCL extracts and results revealed MCL to be a potent antioxidant for the stabilization of corn oil. As a general trend, increased AOA was observed for increased extract concentration. The predominant phenolic compounds identified by HPLC-DAD in MCL extracts were p-coumaric acid, vanillin and ferulic acid

    Characterization of metabolites in different kiwifruit varieties by NMR and fluorescence spectroscopy

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    It is known from our previous studies that kiwifruits, which are used in common human diet, have preventive properties of coronary artery disease. This study describes a combination of 1H NMR spectroscopy, multivariate data analyses and fluorescence measurements in differentiating of some kiwifruit varieties, their quenching and antioxidant properties. A total of 41 metabolites were identified by comparing with literature data Chenomx database and 2D NMR. The binding properties of the extracted polyphenols against HSA showed higher reactivity of studied two cultivars in comparison with the common Hayward. The results showed that the fluorescence of HSA was quenched by Bidan as much as twice than by other fruits. The correlation between the binding properties of polyphenols in the investigated fruits, their relative quantification and suggested metabolic pathway was established. These results can provide possible application of fruit extracts in pharmaceutical industry

    Apple phytochemicals and their health benefits

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    Evidence suggests that a diet high in fruits and vegetables may decrease the risk of chronic diseases, such as cardiovascular disease and cancer, and phytochemicals including phenolics, flavonoids and carotenoids from fruits and vegetables may play a key role in reducing chronic disease risk. Apples are a widely consumed, rich source of phytochemicals, and epidemiological studies have linked the consumption of apples with reduced risk of some cancers, cardiovascular disease, asthma, and diabetes. In the laboratory, apples have been found to have very strong antioxidant activity, inhibit cancer cell proliferation, decrease lipid oxidation, and lower cholesterol. Apples contain a variety of phytochemicals, including quercetin, catechin, phloridzin and chlorogenic acid, all of which are strong antioxidants. The phytochemical composition of apples varies greatly between different varieties of apples, and there are also small changes in phytochemicals during the maturation and ripening of the fruit. Storage has little to no effect on apple phytochemicals, but processing can greatly affect apple phytochemicals. While extensive research exists, a literature review of the health benefits of apples and their phytochemicals has not been compiled to summarize this work. The purpose of this paper is to review the most recent literature regarding the health benefits of apples and their phytochemicals, phytochemical bioavailability and antioxidant behavior, and the effects of variety, ripening, storage and processing on apple phytochemicals

    Response of rats to a moderate intake of soyabean lectin

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    Primenenie polnoporcionnykh silosov s soderzhaniem svjokly i mocheviny v kormlenii zhvachnykh

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    The aim of the experiments was the evaluation of the physiological and productive effects of the application of full diet silages in the nutrition of heifers, bulls, milk cows and sheep. These silages contained sugar beet or half-sugar beet (50% d.m.) urea (20 - 60% N in total N ) , fiber foods, mineral additions and conservants. The average content of d.m. in silages was 21 - 26%, crude protein and crude fiber was 13 - 16% and 12 - 16% respectively and the concentration of the metabolic energy (ME) was 9.4 - 10.6 MDME per kilogram d.m.. The application of these silages alloued to eliminate the concentrates from the diet for heifers, bulls and sheep. Feeding ad libitum gave the body gain 0.8 - 1.0 kg per day in the case of the bulls. In the case of heifers good health and fertility uas obtained. Cous fed with these silages gave about 12 l of milk per day. These effects were due to good mutual cooperation of the energetic and nitrogen metabolism in the rumen of the animals fed with the diet containing beet and urea.Целвю проведенных экспериментов была оценка физиологически-продуктивных эффектов, вытекающих из применения полнорационных силосов в кормлении яловок, рогатого скота, молочных коров, а также овец. Полнорационные силосы готовились с уделом сахарной или полусахарной свёклы (50% сухой массы), мочевины (20 - 60% N в N общем), корм волокнистых, минеральных и консервирующих веществ. Среднее содержание сухой массы в силосах составляло 21 - 26%, общего белка и сырого волокна соответственно 13 - 16 и 12 - 16%, концентрация метаболической энергии (МЕ) 9,4 - 10,6 MJ МЕ/кг сухой массы. Применение этих силосов позволило полностью исключить кормовые смеси из кормовых доз предназначенных для рогатого скота, яловок и овец. Скармливание этих силосов "ad libitum'' разрешило увеличить прирост живой массы в границах 0,8 - 1,0 кг/сутки у рогатого скота. У яловок обеспе-чает значительную здоровость и плодовитость, а в кормлении молочных коров обеспечивает потребности необходимые для получения около 12 л молока/сутки. Достигнутие эффекты вытекают из полезного взаимодействия энерго и азотного обмена в рубце животных, кормленных полнорационными дозами силосов с содержанием свёклы и мочевины

    �ber ein Gleichgewichtsprinzip von G. N. Lewis

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