Food Chemistry Commons^™

Casein Micelles From Bovine Milk: Native Structure, Interactions, And Practical Applications Of Their Structural Modification, Raymundo Trejo

Doctoral Dissertations

A definitive structure of the native casein micelle structure continues to elude researchers. Data and images obtained via cryo - transmission electron microscopy of isolated native casein micelles allowed for the reconstruction of a three dimensional model of the micelle; which contains water filled cavities (ca. 20 to 30 nm diameter), channels (diameter larger than ca. 5 nm), and several hundred high density nanoclusters (6-12 nm diameter) within the interior of the micelles.

The SDS polyacrylamide gel electrophoresis of isolated micelles (pH 6.8, 5.0) showed that whey proteins were found associated with the isolated micelles regardless of the pH …

Changes In Carbohydrates Of Navy Beans During Hydration And Subsequent Thermal Processing, Robert Blake Lowe

Masters Theses

Navy beans were subjected to six different hydration protocols that varied in time, temperature, and methodology after which they were thermally processed in both a brine solution and a typical baked bean sauce. Beans, isolated starch, and hydration fluid were analyzed immediately after the completion of hydration protocols. Significant differences were noted between those protocols utilizing low heat (1 and 2) and those utilizing high heat methods (3-6). Bean from low heat protocols were firmer overall. Starch granules from low heat beans were smaller in overall size, experienced less surface damage retained birefringence, and could absorb more water (higher swell …

Plant Protein-Based Nanocomposite Materials: Modification Of Layered Nanoclay By Surface Coating And Enhanced Interactions By Enzymatic And Chemical Cross-Linking, Minfeng Jin

Doctoral Dissertations

Highly intercalated or exfoliated nanoclay montmorillonite (MMT) has promises to improve mechanical and barrier properties of nanocomposite materials that may be further improved by strengthening interactions between matrix polymers and nanofillers. In this work, water-soluble proteins extracted from hominy feed and soy flour were utilized to modify the structures of MMT layers by surface-coating. Following coating at 60 °C using different MMT:protein mass ratios (49:1-2:1) and pH (2.0-10.0), the nanoclay was triple-washed for zeta potential analysis and lyophilized for X-ray diffraction and Fourier transform infrared spectroscopy analyses. Results showed that protein adsorption on MMT occurred at all pH conditions by …

Chitosan-Gallic Acid Films As Multifunctional Food Packaging, Stephanie Beth Schreiber

Masters Theses

Chitosan is a good candidate for multifunctional food packaging because of its biocompatibility, biodegradability, antibacterial properties, secondary antioxidant activity, film forming ability, resistance to lipids and because of its structure which is very desirable for grafting various compounds to it. For this research, we took advantage of chitosan’s amino group that has nuceleophilic character at a pH above its pKa, which is 6.3. Gallic acid, a phenolic compound with primary antioxidant properties was grafted to chitosan using 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide and N-hydroxysuccinimide. Grafting was evaluated using FTIR-ATR and ¹H and ¹³CNMR. FTIR showed evidence of grafting on the amino …

Chenopodium Berlandieri And The Cultural Origins Of Agriculture In The Eastern Woodlands, Daniel Shelton Robinson

Masters Theses

The development of agriculture in the New World has been a topic of prominent historic interest, but one that has ignored some regions in favor of others. The woodlands of Eastern North America have felt this bias in the investigation of agricultural origins, but this has not prevented the development of theories to explain the emergence of a complex of indigenous agricultural plants in the region. Data collection and technological advances have in large part validated these theories, creating a model for domestication. By emphasizing farming over other cultural practices, however, these theories lack explanatory power with regards to the …