Index Catalog // ScholarsArchive@OSU

The effect of erythorbic acid on the determination of ascorbic acid levels in selected foods by high performance liquid chromatography and spectrophotometry

Creator:: Tuan, Shenhsiu
Abstract:: A high performance liquid chromatography (HPLC) procedure using a LiChrosorb-NH₂ column and a eluant buffer of 75:25 (v/v) of acetonitrile:0.05 M KH₂P0₄, pH 5.95, was developed for the successful separation and determination of ascorbic and erythorbic acids in selected food samples. Application of the method, which is sensitive, rapid and...
Resource Type:: Masters Thesis
Full Text:: , natural and artificial flavor drink mixes, and Hi-C drinks gave satisfactory results. Dehydroascorbic

The stability of ascorbic acid in bottled cranberry-based beverages under home-use conditions

Creator:: Wong, Geoffrey K.
Abstract:: Commercially bottled, vitamin C-fortified, cranberry juice cocktail and cranberry-apple (cranapple) juice drinks were stored at 5°C under simulated home-use conditions. Ascorbic acid (AA) and dehydroascorbic acid (DHA) levels were evaluated over a period of seven days by high performance liquid chromatography (HPLC). Total vitamin C content was also determined by...
Resource Type:: Masters Thesis
Full Text:: approved: _ . Allen F. Anglemier Commercially bottled, vitamin C-fortified, cranberry juice

Storm runoff characteristics of various plant communities within the Oregon Range Validation Area

Creator:: Gaither, Ronald E.
Abstract:: A sediment production and infiltration study was conducted within the Oregon Range Validation Project Work Area in east-central Oregon during the summers of 1977 and 1978. High intensity rainfall was simulated by using a Rocky Mountain Infiltrometer. This sprinkler-type infiltrometer closely approximates conditions associated with natural rainfall. The basic ecological...
Resource Type:: Masters Thesis
Full Text:: communities within the Oregon Range Validation Area AN ABSTRACT OF THE THESIS OF Ronald E. Gaither for the

Lipid compostion of a marine ammonium oxidizer grown at 5 and 25 °C

Creator:: Jones, Ronald D. and Prahl, Fredrick
Abstract:: The lipid composition of an ammonium oxidizing bacterium isolated from Alaskan waters was examined at 2 different growth temperatures (5 and 25 °C). The composition was surprisingly simple with palmitic acid (C ₁₆:₀) and a monounsaturated isomer, palmitoleic acid, comprising about 90 % of the total lipids. There was a...
Resource Type:: Article

Identification of cytokinin reductase in Phaseolus embryos

Creator:: Martin, Ruth C.
Abstract:: A critical balance of hormones is necessary for normal plant development. Therefore, precise mechanisms must exist to maintain proper levels of cytokinins, a group of hormones regulating cell division and differentiation. Structural modifications of the naturally occurring cytokinin, zeatin; including the oxidation, O-glycosylation and reduction of the N⁶-side chain; may...
Resource Type:: Masters Thesis
Full Text:: AN ABSTRACT OF THE THESIS OF Ruth C. Martin for the degree of

Color of strawberry juice and concentrate as influenced by heating and storage temperatures

Creator:: Hassanein, Sitir M.
Abstract:: This investigation was conducted to study the effects of blanching and storage temperatures on the color of strawberry juice and concentrate. Strawberry juice and concentrate (42°βrix) were prepared from blanched crushed Tioga strawberries. Crushed strawberries were blanched, in a steam-jacketed kettle, at 70°, 80°, and 90°C for 1 min. Ascorbic...
Resource Type:: Masters Thesis
Full Text:: approved: , Dr. Ronald E. Wrolstad Substituting for Dr. Morris W. Montgomery This

Development of analytical methodology for verification of authenticity of apple juice

Creator:: Lee, Hyoung S.
Abstract:: Apples growing in New Zealand, Argentina, Mexico, Michigan and Washington were used to provide the compositional data and to develop the analytical procedures for the use in verification of authenticity of apple juices. High Performance Liquid Chromatography (HPLC) techniques were applied for glucose, fructose, sucrose, sorbitol, malic, citric, quinic, shikimic,...
Resource Type:: Dissertation
Full Text:: : Dr. Ronald E. Wrolsdld Apples growing in New Zealand, Argentina, Mexico, Michigan and Washington

Studies on canker in European filbert caused by Anisogramma anomala

Creator:: Postman, Joseph D.
Abstract:: Anisogramma anomala causes a stem canker of filberts, Corylus avellana. This disease became a threat to the main U.S. filbert growing region when it was introduced into the Pacific Northwest around 1968. Various methods of artificially inoculating filbert trees and seeds were explored. Less than 1% of potted filbert trees...
Resource Type:: Masters Thesis
Full Text:: by Anisogramma anomala Redacted for Privacy Abstract approved: . H. Ronald Cameron Anisogramma

Studies on the germination and growth of Anisogramma anomala Peck (Muller) in vitro

Creator:: Lightfoot, Richard (Richard Thomas), 1958-
Abstract:: This study examined the effects of pH, temperature, washing, and post-hydration drying on germination of Anisogramma anomala ascopores. Spores germinate most readily in the temperature range of 5 to 15 degrees C, with an optimal temperature of 10 degrees (1 sd=0.05). Growth was best in the pH range of 5...
Resource Type:: Masters Thesis
Full Text:: range of 5 to 15 degrees C, with an optimal temperature of 10 degrees (1 sd=0.05). Growth was best in

Anthocyanin pigment, nonvolatile acid and sugar composition of red raspberry juice

Creator:: Spanos, George A.
Abstract:: Seven red raspberry (Rubus Ideaus L.) samples from Oregon, Washington, British Columbia and New Zealand were processed into juice. These, along with three juice samples supplied from West Germany were analyzed by high performance liquid chromatography, (HPLC), for nonvolatile acid, sugar, anthocyanin and anthocyanidin composition. In order to quantitate the...
Resource Type:: Masters Thesis

ScholarsArchive@OSU

The effect of erythorbic acid on the determination of ascorbic acid levels in selected foods by high performance liquid chromatography and spectrophotometry

The stability of ascorbic acid in bottled cranberry-based beverages under home-use conditions

Storm runoff characteristics of various plant communities within the Oregon Range Validation Area

Lipid compostion of a marine ammonium oxidizer grown at 5 and 25 °C

Identification of cytokinin reductase in Phaseolus embryos

Color of strawberry juice and concentrate as influenced by heating and storage temperatures

Development of analytical methodology for verification of authenticity of apple juice

Studies on canker in European filbert caused by Anisogramma anomala

Studies on the germination and growth of Anisogramma anomala Peck (Muller) in vitro

Anthocyanin pigment, nonvolatile acid and sugar composition of red raspberry juice

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