Search for dissertations about: "lecithin"

Showing result 1 - 5 of 15 swedish dissertations containing the word lecithin.

2. 1. Lecithin-Based Microemulsions for Pharmaceutical use - Phase behavior and Solution Structure

   Author : Christian von Corswant; Livsmedelsteknik; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Food and drink technology; felodipine; solubilization; drug delivery; self-diffusion NMR; alkylmaltoside; microstructure; isopropyl myristate; triglyceride; soybean phosphatidylcholine; Microemulsion; lecithin; Livsmedelsteknik;

   Abstract : Microemulsions are thermodynamically stable, transparent solutions of water, oil and amphiphile(s). It is possible to incorporate large amounts of oil in microemulsions, which makes them interesting for use as a drug delivery vehicle for water insoluble drugs. A prerequisite for pharmaceutical use, however, is a low toxicity of the composition. READ MORE

4. 2. On the Extraction of Essential Oils by Supercritical Carbon Dioxide and its Influence on the Mesomorphic Phase Structures

   Author : José da Cruz Francisco; Kemiska institutionen; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Natural oils; fats and waxes technology; Naturliga oljor; fetter; vax; Kemiteknik och kemisk teknologi; Chemical technology and engineering; Livsmedelsteknik; Food and drink technology; phase behavior; soybean lecithin; monoolein; cineole; terpenes; eucalyptus; extraction; Essential oils; supercritical carbon dioxide;

   Abstract : A comparison of essential oils from leaves of Eucalyptus camaldulensis Dehn. obtained by hydrodistillation (HD) and supercritical carbon dioxide (SC-CO2) extraction is presented. Selected major components of the oils showed a predominance of higher molecular weight components in the SC-CO2 extracts than in those obtained by HD. READ MORE

5. 3. Effects of 2,3,7,8-tetrachlorodibenzo-p-dioxin on vitamin A storage in rat hepatic stellate cells

   Author : Annika Hanberg; Karolinska Institutet; Karolinska Institutet; []
   Keywords : Dioxin; TCDD; vitamin A; retinoids; lecithin:retinol acyltransferase; absorption; stellate celL hepatic vitamin A accumulation; intestinal lymph collectionDoctoral Thesis 1996 Annika Hanberg;

   Abstract : The polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs), popularly called dioxins, are persistent pollutants with widespread occurrence in the environment as well as in human food and tissues. 2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD), the most toxic dioxin, as well as other dioxin-like compounds induce a broad spectrum of biochemical and toxic effects, many of which occur at extremely low doses or concentrations. READ MORE

6. 4. Studies on the effects of 2,3,7,8-tetrachlorodibenzo-p-dioxin on vitamin A homeostasis

   Author : Charlotte Nilsson; Karolinska Institutet; Karolinska Institutet; []
   Keywords : TCDD; dioxin; vitamin A; retinoic acid; lecithin:retinol acyltransferase; retinyl ester hydrolysis; retinol-binding protein; kidney; lymph; stellate cell; kinetics; model-based compartmental analysis;

   Abstract : Vitamin A (retinoids) is needed for normal vision, growth, reproduction, cell differentiation, embryonic development, and immune function. Retinoids exert their functions in the same way as classical hormones, as transcription factors acting via nuclear receptors. READ MORE

7. 5. Emulsion formation and stability - Impact of the dispersed state of the emulsifier on emulsification

   Author : Emma Magnusson; Livsmedelsteknik; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Emulsion; phospholipid; dispersed state; field flow fractionation; freeze-thaw stability;

   Abstract : Emulsions find a variety of applications in for example food, cosmetics and pharmaceutical preparations. In order to obtain emulsions with desired properties it is important to understand how different factors, such as the properties of the emulsifier and the emulsification procedure, impact the final emulsion properties. READ MORE