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.
Results
Showing 1 to 20 of 232 for “"antioxidant activity"”.
-
Antioxidant activity and phytochemical evaluations of selected medicinal plants
… was shown to have potent DPPH radical scavenging activity (IC50 = 48.75 ± 7.00 μg/ml). Activity-guided fractionation resulted in the isolation of three principal antioxidant compounds; acteoside, angoroside C and angoroside A. Acteoside (yield = 1.21%, IC50 = 15.2 μM) appeared to be the most …
-
Antioxidant activity, protective effects and absorption of polyphenolic compounds
… 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 detection …
-
Antioxidant Activity of 3,5,-Di-Tert-Butyl-4-Hydroxybenzyl Derivatives
Made available in DSpace on 2014-12-05T19:06:49Z (GMT). No. of bitstreams: 1 6104325.pdf: 3228754 bytes, checksum: e2c497516e0129df70d88c6e0169e6cd (MD5) Previous issue date: 1961
-
Elucidation of the Various Mechanisms of Antioxidant Activity of Organosulfur Compounds
… by which organosulfur compounds act as antioxidants are often described as ‘secondary antioxidants’ since it is believed that they slow the rate of radical initiation by decomposing hydroperoxides. Organosulfurs also figure in various natural products from the genus Allium, of which …
-
Phenolic composition and antioxidant activity of sweetpotatoes [Ipomoea batatas (L.) Lam]
… factors on sweetpotato phenolic content and antioxidant activity was determined. Simplified, robust, and rapid methodologies were developed to quantify total phenolics and individual phenolic acids in sweetpotatoes. Quantification of total phenolic content using Folin-Denis reagent provided …
-
Elucidation of the components involved in the antioxidant activity of honey
… content, the level of brown pigments, and antioxidant activity in order to elucidate the main components involved in the antioxidant activity of honey. By employing size-exclusion chromatography in combination with activity-guided fractionation, it was demonstrated that the antioxidant …
-
Sorghum phenolic extracts : their storage stability and antioxidant activity in sunflower oil
… content of total phenols, condensed tannins and antioxidant activities. The effect of oxidizing conditions during extraction, and the storage stability of a freeze-dried crude phenolic extract (CPE) from the condensed tannin sorghum bran as influenced by packaging, storage temperature and length …
-
Studies on the Assay, Stability, Antioxidant Activity and Oxidation Products of Tocopherols
Made available in DSpace on 2015-05-12T21:38:36Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7013279.PDF: 1313826 bytes, checksum: f7a7ec27baa35974924de4315d2b3846 (MD5) Previous issue date: 1969
-
Investigation of the antioxidant activity of phenolic compounds in cell culture systems
… polyphenolic compounds which were expected to be antioxidants in vivo. Antioxidants are compounds which at low concentrations can prevent or reduce the deleterious effects caused by reactive oxygen species (ROS) induced by UVA exposure of the skin. This study focuses on developing methods required …
-
Antioxidant Activity of Ampelopsis Grossedentata Crude Extract and its Major Component Dihydromyricetin
… the shelf life of many food products. Adding antioxidants to foods is the most common way to solve this problem. Reports on safety issues of synthetic food additives have raised consumer interest in "all natural" foods, without added antioxidants or with synthetic replaced with natural …
-
Physicochemical Properties and Antioxidant Activity of Enzymatic Modified Soy Protein Isolate Films with Lignin
… desirable and optimized enzyme crosslinking activity before film preparation. Physicochemical properties including viscosity and molecular weight distribution of the modified proteins and films were measured. Results confirmed the enzymatic treatment is an effective way to modify the SPI …
-
The antioxidant activity of Bulgarian medicinal plants // Проучване на антиоксидантната активност на български лечебни растения
[EN] In vitro antioxidant activity of extracts and fractions from 54 medicinal plants with application in Bulgarian traditional medicine is the subject of this study. By analysis of the results obtained, one plant was chosen to examine its extract antioxidant and anti-inflammatory activity in …
-
Quantification of Total Phenolic Content and Antioxidant Activity of Oat Cultivars Grown in South Dakota
… correlation of total phenolic content (TPC) and antioxidant activity (AA %) of oat samples. High performance liquid chromatography (HPLC) was used to analyze the oat samples for avenanthramide content. The total phenolic content was measured using AOAC method (method # 952.03, 1990). Extraction …
-
Antioxidant activity of Mn-salophen complex and its effects on antioxidant enzymes in Escherichia coli
Mn-salophen complex with superoxide-scavenging activity was prepared from manganese(III) acetate dihydrate and salophen in ethanol. Visible absorption spectrum of the red-brown solution exhibited a broad absorption band at 430 - 450 nm with two shoulders between 500 and 600 nm which were absent …
-
Antimicrobial and antioxidant activity of crude extracts and fractions from stems and leaves of Tephrosia Lupinifolia
… stems of T. lupinifolia, and to evaluate their antioxidant as well as antimicrobial activities. Crude extracts were prepared by suspending the powdered plant material in an equivolume mixture of dichloromethane and methanol at room temperature for 48 hours on an orbital shaker. The extracts were …
-
The antioxidant activity of the extract of Pangium edule Reinw. (Keluak) seed in cooked ground turkey
… (K; 200 and 400 ppm) along with synthetic antioxidant (BHT, 200ppm) on the oxidative stability of cooked ground turkey stored at 2˚C for 7 days for the first study and 15 days for the second study was examined. The Keluak seed was extracted with acetone: water: acetic acid (90: 9.5: 0.5, …
-
Effects of pre and post-harvest treatments on the phenolic compounds and antioxidant activity of different onion varieties
… radical scavenging ability, contributing to its antioxidant capacity. Phytochemicals and antioxidants of onion are predominantly important for human health since phytochemicals have multiple compounds, including phenolics, flavonoids, anthocyanins, and quercetin. The total phenolic content of …
Page 1 of 12