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 11 of 11 for “"steam distillation"”.
-
A Modified Voges-Proskauer Method of Determining Diacetyl in Dairy Cultures
… gravimetric method. This procedure involved distillation of the diacetyl from the mother substance. The most common derivative formed was nickel dimethylglyoximate. Principle disadvantage of this method were that large amounts of sample were required for steam distillation when the products …
-
Isolation and Partial Characterization of the Toxic Substance from EREMOCARPUS SETIGERUS BENTH
… we isolated and tested this substance by steam distillation and thin layer chromatography technique. A yellow sticky toxic substance was isolated with Rf values of 0.15 in benzene system and 0.57 in benzene-absolute ethanol (95:5 v/v) system.</p> <p>The toxic substance which is free of …
-
Evolution of Nitrogen Compounds From Soybean (Acetaldehyde Oxime, Nitrous Oxide, N-15)
… of the trapping solutions was determined by steam distillation methods. Over a 24 h period, the shoots evolved 840 (mu)g N(.)plant('-1)(.)d('-1). Maximum evolution rates occurred near the end of the light period. Trap II retained 62.1% of the N evolved, whereas traps I and III retained 18.7% …
-
Environmentally Benign Extraction Processes in Analytical Separation of Essential Oils
… processes for essential oil extraction involve steam distillation and organic solvent extraction. Steam distillation involves high heat, which can cause sample hydrolysis and thermal degradation of heat-sensitive compounds, whereas in organic solvent extraction, polluting solvents and expensive …
-
The electronic absorption spectra of di- and tri-arylmethane dyes containing fluorine
… which has been developed to enable simultaneous steam distillation and solvent extraction.
-
Speciation of Mercury by Chromatography Coupled with Atomic Spectrometry
… to give positive artifact formation when using a steam distillation sample preparation procedure, good agreement and no artifects were observed upon analysis. A further contaminated land, an uncontaminated soil and sediment sample were also studied. For all the samples studied by GC-AFS total …
-
Continuous aerobic processing of piggery effluent: a new approach to quantifying the fate of the nitrogen component
… NH\(_4^+\), NO\(_2^-\) and NO\(_3^-\)). The steam distillation technique for nitrite and nitrate was found to be unreliable, therefore, high performance liquid chromatography was used as an alternative. The existence of the intermediate nitrified N form of hydroxylamine is postulated but was …
-
EXPLOITATION OF ANTIOXIDANT BIOACTIVE COMPOUNDS FROM AGRO-INDUSTRIAL BY-PRODUCTS
… residue from essential oil production (plant steam-distillation); − Caper (Capparis spinosa L.) brine residue from salty flower buds’ production. Once the agro-industrial by-products were selected, the study focused on identifying the best extraction techniques according to the principles of …
-
Extraction of bioactive compounds from New Zealand Manuka leaves (Leptospermum scoparium) using emerging technologies
… ethanol as reference solvents and conventional steam distillation and Soxhlet extraction. β-caryophyllene showed good stability in menthol: lactic acid DES over nine days of storage. Moreover, results also approved good reusability of the potential DES after four cycles of extraction. Further, …
-
Tropical citrus antioxidants and catabolism of phenolics in green tea, coffee, cocoa and orange juice
… Tropical citrus essential oils were extracted by steam distillation (SD) and simultaneous distillation extraction (SDE) and analysed using gas chromatography-mass spectrometry (GC-MS). More than 40 compounds were identified and the major component in almost all citrus fruits and leaves was …
-
Stanovení obsahových látek ve fytofarmakách
V předložené bakalářské práci byly analyzovány bylinné čaje, jejichž hlavními složkami jsou třezalka a meduňka. V rámci řešení bakalářské práce byly sledovány jejich fyziologické vlastnosti, chemické složení a vliv na zdraví člověka. Práce se zabývá metodami izolace a identifikace silic z vybraných …