Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 31 for “"total phenolics"”.
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Effects of aspects of terroir on the phenolic composition of New Zealand Pinot noir wines
… sealed bottles were opened. The changes in total phenolics, total tannins, anthocyanins and colour parameters over 134 days were quantified. Results showed that the colour-related parameters were more sensitive to storage conditions and time compared with the other parameters. Storage at - …
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Antioxidant activity, protective effects and absorption of polyphenolic compounds
… the contribution of individual compounds to the total antioxidant activity. Red wines were analysed for their phenolic content and antioxidant activity using a range of complementary techniques including HPLC-tandem mass spectrometry, preparative HPLC and HPLC with an on-line antioxidant …
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Herbivore resistance in inavasive and native Myriophyllum spicatum and Myriophyllum heterophyllum
… however, were induced by jasmonic acid. Total phenolics and tellimagrandin II concentrations were not affected by jasmonic acid and changes in nitrogen concentrations were inconsistent. Tissue reddening, in part caused by decreased chlorophyll and increased anthocyanin concentrations, was …
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ULTRASONIC APPLICATIONS- PHYTOCHEMICAL ANALYSES OF SOME MEDICINAL NATURAL PRODUCTS IN FOOD PLANTS
… generation of more than eight thousand different phenolics, fruits and vegetables are the prime sources of natural antioxidants. The consumption of fruits and vegetables has been strongly linked with several health benefits, a result of their medicinal properties and high nutritional value. …
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The Effects of Cluster Thinning on Vine Performance, Fruit, and Wine Composition of Pinot Noir (Clone 115) in the Edna Valley of California
… Similarly, cluster thinning increased berry total phenolics by 87% in 2017 and by 140% in 2018 relative to the control, with no significant differences found between the different thinning treatments. However, the levels of anthocyanins and total phenolics were generally not affected by …
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Bioconversion of lignocellulosic hydrolysate to acetic acid using Moorella thermoacetica
… and 39% of theoretical respectively based on total sugars). This acetogen can partially consume arabinose, galactose and mannose within 72 h of fermentation. Acetic acid yield in forest residues was adversely affected by high concentration of arabinose, galactose and mannose. Glucose to xylose …
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Quality analysis of ultrasonically dried strawberry and comparison to conventional drying methods
… and nutritional properties measured include total phenolics, antioxidant capacity, and ascorbic acid. Physical properties measured include color changes, browning and rehydration ratio. Stability parameters measured include glass transition temperature and water activity. Additionally, drying …
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Comparative Impacts of Irradiation on Antioxidant Compounds of Scalded and Non-scalded Skin of Granny Smith Apples
… irradiation on antioxidants – ascorbic acid, total phenolics, α-tocopherol, carotenoids, chlorophyll, and campesterol – in scalded and non-scalded apple peel tissue. Apples were treated with 0.2-0.77 kGy and stored at 0-1 °C. Irradiation at the applied doses increased scald incidence, …
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Influence of dietary polyphenols on carbohydrate intestinal digestion and absorption
… typically derived from experiments with pure phenolics and phenolic rich extracts have pointed to this benefit being associated with two potential mechanisms: (1) the ability of specific polyphenolics to inhibit carbohydrate digestion (amylase and glucosidase) and (2) polyphenolic inhibition …
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Ultrasonication as an abiotic elicitor - effects on antioxidant capacity and overall quality of romaine lettuce
… indices examined included color, texture, total phenolics, antioxidant capacity, and sensory properties. Phenylalanine ammonia-layse (PAL) activity of lettuce from different treatments was monitored during storage. There were no differences in sample quality attributes between ultrasound …
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Promotion of Value-Added Uses of Soybeans
… showed their similar antioxidant activity, total phenolics, and isoflavones to normal fatty acid soybeans. The potential for a different trend in tocopherols and lutein was observed between low-linolenic and regular fatty acid soybeans, but the limited study size prevented a definitive …
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Phenolic composition and antioxidant activity of sweetpotatoes [Ipomoea batatas (L.) Lam]
… rapid methodologies were developed to quantify total phenolics and individual phenolic acids in sweetpotatoes. Quantification of total phenolic content using Folin-Denis reagent provided more reliable results than Folin-Ciocalteu reagent. Individual phenolic acids were quantified by …
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Preservation of Bioactive Compounds in Blueberry Fruit
… The products were fractionated and tested for total phenols, hepa-1c1c7 and LNCaP antiproliferation, FRAP antioxidant, and DPPH radical scavenging activity. In general, products that were heat processed retained a majority of the antioxidant activity and total phenolics found in unprocessed …
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Carbon based secondary metabolites in African savanna woody species in relation to anti-herbivore defense
… been inferred from foliar condensed tannin and total phenolic concentrations. However these measures are controversial since condensed tannin chemical heterogeneity compromises its simple quantification and total phenolics, which is a measure of general foliar phenolics, includes many different …
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Investigation of insulin releasing and glucose lowering effects of extract of selected plants used in African traditional medicinal practice
… or water as solvent. Phytochemical screening, total flavonoids and total phenolics content was carried out. Effects of extracts on insulin secretion at various glucose concentrations, in the presence of established modulators of insulin secretion and in the absence of extracellular calcium were …
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COMPARATIVE BIOCHEMICAL AND GENETIC STUDIES OF TESTA DEVELOPMENT IN NORMAL AND HULL-LESS PHENOTYPES OF PUMPKIN (CUCURBITA PEPO L)
… in quantities of sugars, free amino acids, total phenolics, lipids and starch between phenotypes. By maturity, precursor pools and starch in testae had been essentially exhausted in all strains.</p><p>Total N values for testae of normal and hull-less phenotypes were not consistently …
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Effect of yacon flour (Smallanthus sonchifolius) consumption on body weight, body composition, intestinal permeability and metabolic changes in excess body weight adults
… the flour chemical characterization, FOS and total phenolics contents were evaluated. Daily consumption of 25g of yacon flour was well tolerated, did not cause adverse gastrointestinal effects, increased dietary fiber consumption, improved stool consistency, reduced constipation frequency and …
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Identification of Phenolic Compounds from Peanut Skin using HPLC-MSn
… fractions based on molecular size. Analysis of total phenolics in these fractions indicated Gregory peanut skins contain high concentrations of phenolic compounds. Further studies revealed the fractions contained compounds which exhibited antioxidant activities that were significantly higher …
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Investigating peduncle colour evolution and chemistry during ripening in Vitis vinifera L. cv Shiraz
… the sugar content (⁰Brix), acidity (pH and TA), total anthocyanins and total phenolics. The image analysis showed that the overall peduncle colour evolution from green to brown was well reflected in the change of a* and b* values in the CIEL*a*b* colour system coupled with their polar parameters …
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Preparation of juice concentrates by nonthermal processing technologies: a multiple hurdle approach
… properties of the juice concentrate, such as total soluble solids, pH, and water activity, were retained during refrigerated storage. However, when the concentrates were reconstituted with deionized water and compared to the original juice, there was a slight increase in pH and reduction in …
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