Index Catalog // ScholarsArchive@OSU

Strawberry cell wall polysaccharides : an intervarietal comparison of compositional, physical, and textural properties

Creator:: Buerger, Michelle Carlene
Abstract:: Maintaining the structural integrity of cell walls largely determines the texture of fruit products during freezing processes. Strawberries undergo major textural changes when frozen, and varietal differences in quality after thawing are not readily predicted from mechanical and sensory testing of the fresh fruit. The objectives of this study were...
Resource Type:: Masters Thesis
Full Text:: strawberries (Armbruster, 1967; Aref et al, 1956; Wegener et al, 1951; Hoover and Dennison, 1955). Simpson

Use of ion-exchange and direct osmotic concentration technologies for processing cantaloupe juice

Creator:: Galeb, Abduljalil D. S.
Resource Type:: Dissertation
Full Text:: Abstract approved: Ronald E. Wrolstad Different technologies for processing cantaloupe fruit into

Cherry phytochemicals

Creator:: Chaovanalikit, Arusa, 1974-
Abstract:: The distribution of anthocyanin pigments and polyphenolics of sweet (Prunus avium) and sour cherries (Prunus cerasus) were determined by Ultraviolet- Visible (UV-Visible) spectrophotometry and High Performance Liquid Chromatography with photodiode array detector (HPLC-DAD). Their antioxidant properties were determined by Oxygen Radical Absorbance Capacity (ORAC) and Ferric Reducing Antioxidant Power (FRAP)....
Resource Type:: Dissertation
Full Text:: Phytochemicals Abstract approved: Ronald E. Wrolstad The distribution of anthocyanin pigments and

Variation of sugars and acids during ripening of pears and in the production and storage of pear concentrate

Creator:: Akhavan, Iradj
Abstract:: Two methods of separating sugars and acids of Bartlett pears were compared to decide upon a working method for later studies involving identification and quantitation of sugars and acids during ripening of pears and in the production and storage of pear concentrate. The first method involved precipitation of acids with...
Resource Type:: Dissertation
Full Text:: committee, Georgene V. Barte, Dr. M. W. Montgomery, Dr. H. D. Reese, and Dr. H. W

Structure and conformation of red radish (Raphanus sativus L.) anthocyanins and their effect on color and pigment stability

Creator:: Giusti Hundskopf, Maria Monica
Abstract:: Red radish (Raphanus sativus L.) anthocyanins were extracted from liquid nitrogen powdered epidermal tissue using acetone and chloroform and isolated using C-18 resin. Chemical structure and conformation of major pigments were elucidated by 1-D and 2-D NMR, Mass Spectroscopy, HPLC, and spectral analyses. Two novel di-acylated anthocyanins, pelargonidin 3-0-[2-0-(β-D-glucopyranosyl)-(6-0- trans-p-coumaroyl-...
Resource Type:: Dissertation
Full Text:: Their Effect on Color and Pigment Stability. Abstract approved : Ronald E. Wrolstad Red radish

Anthocyanin composition of red raspberry juice : influences of variety, processing, and environmental factors

Creator:: Boyles, Matthew J.
Resource Type:: Masters Thesis
Full Text:: Abstract approved: . _, Dr. Ronald E. Wrolstad Two HPLC (High Pressure Liquid Chromatography

Strawberry wine color quality : influence of variety, maturity and mold contamination

Creator:: Pilando, Leticia S.
Abstract:: This study was conducted to evaluate the influence of maturity, mold contamination and variety on the color quality of strawberry wines. Indices for acceptability were determined using instrumental measurements and sensory analysis. Compositional analyses were done on the fully ripe and overripe Benton and Totem strawberries. Included were anthocyanin content,...
Resource Type:: Masters Thesis
Full Text:: : Dr. Ronald E. Wrolstad This study was conducted to evaluate the influence of maturity, mold

Development of analytical methodology for verification of authenticity in cranberry juice drinks and concentrates

Creator:: Hong, Victor
Resource Type:: Masters Thesis
Full Text:: Concentrates Abstract appproved _ Dr.' Ronald E. Wrolsta'i Eight samples of Cranberries (Vaccinium

Influence of cultivar and maturity on blackberry polyphenolics and investigation of sediment formation in blackberry juice

Creator:: Siriwoharn, Thanyaporn
Abstract:: The influence of cultivar and maturity on polyphenolic composition and antioxidant activity was investigated by UV-Visible spectrophotometry and analytical high performance liquid chromatography (HPLC) in commercially important blackberry cultivars and selections. The anthocyanin pigments changed tremendously with ripening. Total anthocyanins increased from 74.7-317 mg/100g fw from underripe to over ripe...
Resource Type:: Dissertation
Full Text:: Blackberry Juice. Abstract approved: "fc=»t- Ronald E. Wrolstad The influence of cultivar and

Characterization of anthocyanins in fruit juices and natural colorants

Creator:: Hong, Victor
Abstract:: A method for separation and characterization of individual anthocyanins was developed. High Performance Liquid Chromatography (HPLC) with a polymer based reversed-phase column was used to separate the pigments while on-line Photodiode Array Detection (PDA) was employed to record the UV and Visible spectrum of the individual peaks. Spectral information obtained...
Resource Type:: Dissertation
Full Text:: ' \ Dr. Ronald E. Wrolstad A method for separation and characterization of individual anthocyanins was

Development of a process for production of cantaloupe juice concentrate and determination of its composition and quality

Creator:: Galeb, Abduljalil Derhm Saeed
Abstract:: Fresh ripe, cantaloupes were processed into juice and juice concentrate. Processing trials were conducted on fresh and frozen fruits with and without rind. The effects of maceration enzymes and fining agents on yield and quality were investigated. Compositional measurement included °Brix, pH, titratable acidity, formol values, ascorbic acid content, total...
Resource Type:: Masters Thesis
Full Text:: AN ABSTRACT OF THE THESIS OF Abdulialil D. S. Galeb for the

Influence of processing and storage on the phenolic composition of apple, pear and white grape juice

Creator:: Spanos, George A.
Abstract:: Methodology for characterization of the phenolic profile of apple, pear and grape juice was developed. It utilized High Performance Liquid Chromatography (HPLC) for separation of individual phenolic compounds and Diode Array Detection for recording the Ultra-violet (UV) spectrum of chromatographic peaks. The high resolution achieved and the ability of recording...
Resource Type:: Dissertation
Full Text:: Abstract approved — ..- .,—^ —.- Dr. Ronald E. Wrolstad Methodology for characterization of the phenolic

Analysis of flavor precursors in radish and radish color extracts

Creator:: Kucza, Myriam M.
Abstract:: Radish anthocyanin extract has potential as a natural colorant because of its pigment stability and attractive red hue. Presence of undesirable aroma compounds could limit its applications in foods. The pungent principle of radish, 4-methylthio-3-butenyl isothiocyanate (MTBI), is produced enzymatically upon cell injury from its glucosinolate precursor, 4-methylthio-3-butenyl glucosinolate (MTBG),...
Resource Type:: Masters Thesis
Full Text:: Flavor Precursors in Radish and Radish Color Extracts. Abstract approved: Ronald E. Wrolstad Radish

Radish anthocyanin extract as a natural red colorant for maraschino cherries

Creator:: Hundskopf, Maria Monica Giusti
Abstract:: Red radish anthocyanin extract (RAE) was investigated for coloring brined cherries as an alternative to FD&C Red No. 40. Red radish (Raphanus sativus L.) anthocyanins were extracted from liquid nitrogen powdered epidermal tissue using acetone, partitioned with chloroform, and isolated using C-18 resin. The monomeric anthocyanin content was determined by...
Resource Type:: Masters Thesis
Full Text:: Ronald E. Wrolstad Red radish anthocyanin extract (RAE) was investigated for coloring brined cherries

Characterization and detection of potential adulterants in apple juice by pattern recognition methods

Creator:: Pilando, Leticia S.
Abstract:: Fruit juice concentrates- hard pear, soft pear, fig, prune, raisin, white grape, and pineapple, and sweeteners-invert beet, invert cane, and high fructose corn syrup (HFCS) were characterized by sugar profiles, nonvolatile acid profiles, UV spectral profiles, and mineral content. These fruit juices and sweeteners were also used to adulterate commercial...
Resource Type:: Dissertation
Full Text:: Abstract approved: .. ._ _ _ Dr. Ronald E. Wrolstad Fruit juice concentrates- hard pear, soft pear

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

The stability of pelargonidin-based anthocyanins in natural and model systems

Creator:: Garzon, G. Astrid
Abstract:: Pelargonidin 3-glucoside (pgd 3-glu), pelargonidin 3-sophoroside (pgd 3-soph), and pelargonidin 3-sophoroside 5-glucoside acylated with cinnamic and malonic acids (acyl-pgd 3-soph 5-glu) were extracted from strawberries (Fragaria anannassa cv, Totem), nasturtium flowers (Tropaeolum majus), and radish peel (Raphanus sativus L. cv, fuego), respectively. Their stability was studied in natural and model...
Resource Type:: Dissertation
Full Text:: : = ^ Ronald E. Wrolstad Pelargonidin 3-glucoside (pgd 3-glu), pelargonidin 3-sophoroside (pgd 3-soph), and

Characterization of phenolics in Marion and Evergreen blackberries

Creator:: Siriwoharn, Thanyaporn
Abstract:: Frozen Marion (Rubus sp. hyb) and Evergreen blackberries (Rubus laciniatus) (whole berries, berries without seeds, and seeds alone) were acetone/ chloroform extracted. Phenolics were isolated using C₁₈ cartridges and polyamide resins, then characterized and measured by reversed-phase HPLC/diode array spectral techniques. The Polyamide isolated fractions of Marion berries contained four...
Resource Type:: Masters Thesis
Full Text:: *" Ronald E. Wrolstad Frozen Marion (Rubus sp. hyb) and Evergreen blackberries (Rubus laciniatus) (whole

Use of anthocyanin analyses to determine glycosidase activity in juice- and wine-processing enzymes

Creator:: Wightman, JoLynne Dee
Resource Type:: Dissertation
Full Text:: AN ABSTRACT OF THE ThESIS OF JoLynne D. Wightman for the degree

Anthocyanin pigment, nonvolatile acid and sugar composition of blackberries

Creator:: Fan-Chiang, Ho-ju
Abstract:: The pigments of blackberry fruit were investigated by analytical and preparative high performance liquid chromatography (HPLC) to characterize anthocyanin patterns in commercially important blackberry (Rubus eubatus) cultivars and selections. Five anthocyanin pigments were detected in Evergreen blackberry and they were identified as cyanidin-3-glucoside, cyanidin-3-rutinoside, pentosecyanidin derivative and two acylated cyanidin...
Resource Type:: Masters Thesis
Full Text:: ._S_i-:....,g,,..~n'-a-'-tu~r~e-r_e~d-a~c-te~d~fo~-r~p~riv_a_c_y_.__,._l ____ _ Ronald E. Wrolsted

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

Pineapple juice : phenolic composition and enzymatic browning inhibition

Creator:: Wen, Ling
Abstract:: The phenolic profile of pineapple juice was analyzed by reverse-phase HPLC/Diode Array Detector, and 9 major peaks accounting for 70% of total peak area were characterized. None of these peaks are represented by the pineapple phenolics reported to be present by previous workers. Most of the major peaks are not...
Resource Type:: Dissertation
Full Text:: : Phenolic Composition and Enzymatic Browning Inhibition. Abstract approved: Ronald E. Wrolstad The

Composition of pectic substances in Selva strawberry (Fragaria x ananassa Duch.)

Creator:: Lin, Ben-lin
Abstract:: Pectic substances in the cell wall have long thought to be responsible for the textural changes in fruit during ripening and senescence. Compositional variation within the pectic macromolecules could affect the external characteristics of the fruit. Strawberries undergo adverse quality changes such as softening and juice loss after freezing and...
Resource Type:: Masters Thesis
Full Text:: : . _._ Dr. Ronald E. Wrolstad Pectic substances in the cell wall have long thought to be responsible for

The potato : composition, non-enzymatic browning and anthocyanins

Creator:: Rodriguez-Saona, Luis Enrique
Abstract:: Chipping varieties and model systems were used to determine the role of potato constituents on chip color. Composition was evaluated by HPLC and chip color measured using a ColorQuest colorimeter. Reducing sugar (RS) content did not completely explain color quality when present in low concentrations (<60 mg/lOOg). Levels of ascorbic...
Resource Type:: Dissertation
Full Text:: Potato: Composition. Non- Enzvmatic Browning and Anthocyanins Abstract approved by: Ronald E

Red raspberry and blackberry juice and wine : the effect of processing and storage on color and appearance

Creator:: Rommel, Angelika
Abstract:: Wines were made from thawed, frozen red raspberries and blackberries (Meeker and Evergreen varieties, respectively) by 1. fermentation on the pulp, 2. fermentation of depectinized juice, and 3. fermentation of high temperature short time (HTST) treated depectinized juice. The influence of fining was also investigated. The wines were stored at...
Resource Type:: Masters Thesis
Full Text:: Abstract approved Dr. Ronald E. Wrolstad Wines were made from thawed, frozen red raspberries and

Apple polyphenolics and their antioxidant properties : influence of cultivars, post-harvest storage, and 1-MCP treatment

Creator:: Widyasari, Maria Angela Artania
Abstract:: The distribution of total phenolics, antioxidant capacity, monomeric anthocyanin, and ascorbic acid contents in the peel and flesh of Red Delicious, Granny Smith, and Fuji apples during a six-month storage period were determined. In addition, the effect of 1-MCP (1-Methyl cyclopropene) on these parameters of the edible portion of apples...
Resource Type:: Masters Thesis
Full Text:: Storage and 1- MCP Treatment Abstract approved: Ronald E. Wrolstad The distribution of total

Color and pigment characterization of royal okanogan huckleberry juice

Creator:: Price, Cornelia Lynde
Resource Type:: Masters Thesis
Full Text:: . ■ it Ronald E. Wrolstad Royal Okanogan Huckleberry juice was found to have a high pH (4.4

Synthesis of the naturally occurring cyclopropenoids malvalic and sterculic acids

Creator:: Kray, William David
Abstract:: The two naturally occurring cyclopropene fatty acids, sterculic and malvalic, have been synthesized. The cyclopropene ring was made by inserting a methylene unit into an acetylenic linkage. The synthesis of methyl sterculate was repeated using diethyl aluminum chloride, diazomethane, and methyl stearolate. Methyl malvalate was totally synthesized. Diethyl malonate was...
Resource Type:: Masters Thesis
Full Text:: to Dr. Ronald H. Engebrecht for his constant encouragement and guidance. I also extend my

Extending shelf-life of fresh-cut pears

Creator:: Dong, Xiaoling
Abstract:: Different concentrations of various browning inhibitors and a firming agent were evaluated to prevent browning and softening of Bartlett, Bosc and Anjou pear slices during cold storage at 2-4°C. Browning inhibition effect of Semperfresh, Snow Fresh and cysteine were compared with that of 4-hexylresorcinol (4-HR). The effect of ripeness on...
Resource Type:: Masters Thesis
Full Text:: Shelf-Life of Fresh-Cut Pears Abstract approved: , , Ronald E. Wrolstald Different concentrations

Use of pineapple juice for inhibition of browning in apples

Creator:: Lozano de Gonzalez, Patricia
Resource Type:: Dissertation
Full Text:: approved: ,, - -- . . - - . D. Barrett Two studies were conducted to evaluate the potential of

Purification of strawberry polyphenol oxidase and its role in anthocyanin degradation

Creator:: Wesche-Ebeling, Pedro Alfredo E.
Abstract:: Polyphenol oxidase (PPO) from strawberries was purified, partially characterized, and used to study its role in the degradation of anthocyanin pigments. The extraction method included the use of a buffered solution containing the phenolic binders Polyclar AT and Amberlite XAD-4. Addition of Triton X-100 resulted in an increase of the...
Resource Type:: Dissertation
Full Text:: D-catechin. The Michaelis constants for D-catechin for PPO fractions Fl and F2 were 0.50mM and

Cross-cultural sweetness preferences for a sports drink

Creator:: Chung, Seo-Jin
Abstract:: Asian countries have become one of the largest export markets for US food developers during the past decade. Understanding consumer expectations and needs in a cross-cultural framework has gained importance for new products to succeed in the international markets. A sports-drink, which is a functional drink for athletes, has been...
Resource Type:: Masters Thesis
Full Text:: advice in Statistics, Dr. Ronald E. Wrolstad and Dr. Shoichi Kimura for their devotion and comments on

Effect of berry integrity on proanthocyanidin extraction during wine production

Creator:: Cerpa-Calderon, Fiorella Karen
Abstract:: Proanthocyanidins are a grape-derived phenolic class of compound that provide wine with bitterness and astringency. Because of this, proanthocyanidins are considered to be essential components of wine quality. Proanthocyanidins are localized in the seed, skin and stem tissue of the grape berry and the composition of proanthocyanidins will vary depending...
Resource Type:: Masters Thesis

Interrelationships among changes in flavor and aroma, and composition of stored strawberry juice concentrate

Creator:: Lundahl, David S.
Abstract:: Sensory evaluation and instrumental methods were applied to the evaluation of strawberry juice concentrate (68°Brix) stored at 20°C which had been produced both commercially (C-SJC) and in a pilot plant (SJC). Sensory evaluation included taste and aroma ratings by intensity scaling and time-intensity of taste, and visual colorimetry by matching...
Resource Type:: Dissertation
Full Text:: . Mina McDaniel contributed to this text by serving as my major advisor. Dr. Ronald Wrolstad was a key

Perceptual characteristics of selected acidulants by different sensory and multivariate methods

Creator:: Rubico, Sonia Mendoza
Abstract:: The taste qualities of acidulants have not been studied in detail despite the fact that they are widely used by the food industry. Studies on characterizing the sensory properties of organic and inorganic acids are very limited. Reported studies are commonly on threshold, equi-sour and the time intensity values of...
Resource Type:: Dissertation
Full Text:: 81 b. Procedure 83 c. Data Analysis 83 d. Equi-Sour Determination 84 e. Chemical

Solubility and structure of fish myofibrillar proteins as affected by processing parameters

Creator:: Lin, Tein Min, 1964-
Abstract:: The results of SDS-PAGE and densitometry indicated that a significant amount of myofibrillar proteins was lost during surimi processing. Microfiltration (MF) was utilized to recover insoluble particulate. The MF-recovered proteins showed highly functional properties in gel hardness, cohesiveness, color, and water retention ability. The soluble proteins concentrated by ultrafiltration (UF)...
Resource Type:: Dissertation
Full Text:: would also like to express my appreciation to the members of my thesis committee, Dr. Ronald Wrolstad

Antioxidant potential of yeast containing beer

Creator:: Morris, Edward E.
Abstract:: It has been suggested that cellular damage from oxygen radicals is one of the processes leading to cardio-vascular disease and cancer. Natural antioxidants prevent uncontrolled oxidative reactions by decreasing molecular oxygen levels, scavenging chain-initiating and chain-propagating free radicals, chelating metals, or decomposing peroxides. Beer is rich in antioxidants, derived both...
Resource Type:: Masters Thesis
Full Text:: cell membranes and cell walls (11). Yeasts metabolize D-glucose, D-fructose, maltose, and

In Vitro fermentation of dietary cellulose by human fecal microorganisms

Creator:: Chang, Hung-pi
Abstract:: The purpose of the study was to set up an in vitro model of the colon which would permit the analysis of cellulose fermentation by human colonic microflora. Studies of the degradation of polysaccharides by colonic bacteria may help to explain the observed physiological consequences of consuming dietary fiber common...
Resource Type:: Masters Thesis
Full Text:: Miller and Dr. Ronald Wrolstad. Special thanks also go to Dr. Juinn-Chin Hsu and Xiaolin Huang for

Influence of vine vigor and shading in Pinot noir (Vitis vinifera L.) on the concentration and composition of phenolic compounds in grapes and wine

Creator:: Cortell, Jessica M.
Abstract:: In 2003 and 2004 vigor zones were delineated in two commercial vineyard sites based on vine growth variation to assess fruit and wine phenolic chemistry. In 2004, the effects of shading on the accumulation of phenolic compounds were also investigated. Model extractions were done from the shading experiment and the...
Resource Type:: Dissertation
Full Text:: and committee members including Dr. Ronald Wrolstad, Dr. Barbara Bond, Dr. Timothy Righetti and Dr

Effect of molecular conformation on the surface properties of polyelectrolyte solutions : xanthan gum model studies

Creator:: Young, San Land
Abstract:: A commercially important polyelectrolyte, xanthan, was chosen for a systematic analysis of the relationship between molecular conformation and surface properties. In the first study the effects of ionic strength, xanthan concentration and temperature on the xanthan molecular conformation were investigated by potentiometric titration. The effects of the same factors and...
Resource Type:: Masters Thesis
Full Text:: his encouragement and guidance. I would also like to thank my graduate committee: Dr. Ronald E

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:: graduate committee: Dr. Ronald E. Wrolstad, Dr. Donald L. MacDonald, Dr. Ellen K. Pikitch. I extened my

Utilization of wastes from Pacific whiting surimi manufacturing : proteinases and protein hydrolysate

Creator:: Benjakul, Soottawat
Abstract:: Both liquid and solid wastes from Pacific whiting surimi manufacturing were characterized and value-added products were recovered. A proteinase in surimi wash water (SWW) was determined to be cathepsin L with Mr 54,200 on SDS-substrate gel. Heat treatment and acidification shifted the activity zone to M [subscript r] 39,500. No...
Resource Type:: Dissertation
Full Text:: molecular weight of 28,800 and has a temperature optimum of 55°C (Seymour et al., 1994). Cathepsin D, a

Adsorption of selected charge mutants of bacteriophage T4 lysozyme at silanized silica surfaces

Creator:: Podhipleux, Nilobon
Abstract:: The adsorption kinetics exhibited by selected charge mutants of T4 lysozyme at silanized silica surfaces were monitored with in situ ellipsometry. Mutant lysozymes were produced by substitution of lysine (Lys) with glutamic acid (Glu). Each substitution resulted in a decrease in the net charge of the protein by 2 units....
Resource Type:: Masters Thesis
Full Text:: between the protein and the surface 65 D Averaged values of kinetic rate constants from the three-rate

Impact of malolactic fermentation on red wine color and color stability

Creator:: Burns, Tresider R.
Abstract:: Malolactic fermentation (MLF) is an important step in the production of wines and is commonly performed in red or cool climate wines to reduce acidity. In this study the impact of MLF on red wine color and the ability of Oenococcus oeni to degrade compounds important to the development of...
Resource Type:: Masters Thesis
Full Text:: practices such as the malolactic fermentation (MLF). The MLF is the enzymatic decarboxylation of D-malic

Understanding the principles and procedures to retain green and red pigments in thermally processed peels-on pears (Pyrus communis L.)

Creator:: Ngo, Thao Xuan
Abstract:: Thermal stabilization of chlorophyll and anthocyanin on pear peels during thermal process was investigated in this study. The green color of peels-on thermally processed (canned) pears was successfully retained by complexation of magnesium-free chlorophyll with zinc ions, and the red pigments were stabilized through anthocyanin-stannous complexation and polymerization of pear...
Resource Type:: Dissertation
Full Text:: thoroughly. I am specially obliged to Dr. Ronald Wrolstad who has taught me on chemistry of pigments and

Gas chromatography/olfactometry and descriptive analysis of cold-pressed lemon oil aroma

Creator:: Young, Sheri L.
Abstract:: Lemon oil quality is affected by numerous factors including lemon variety, climate, soil type, extraction method, etc.. Therefore, quality largely depends upon the lemons' origin, and aroma profiles of oils obtained throughout the world have potential to vary considerably. This research was conducted to identify differences in the aroma profiles...
Resource Type:: Masters Thesis
Full Text:: appreciation goes to my committee members, Dr. Ronald E. Wrolstad, Dr. Cliff Pereira, and Dr. Paul G. Risser

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:: . Ronald E. Wrolstad, Dr. Wilbert Gamble, and Dr. Carolyn A. Raab. I extend my gratitude to Dr. Richard

Immobilized cellooligosaccharides in the study of trichoderma reesei cellobiohydrolases

Creator:: Sangseethong, Kunruedee
Abstract:: A novel type of model substrates, i.e. immobilized p-aminophenyl-β-D-cellooligosaccharides, was developed and used in the study of exocellulases. The two major cellobiohydrolases from Trichoderma reesei, CBH I and CBH II were used as representative enzymes. p-Aminophenyl derivatives of cellobiose (PAPG₂), cellotriose (PAPG₃), and cellotetraose (PAPG₄) were synthesized from the reaction...
Resource Type:: Dissertation
Full Text:: -aminophenyl-fJ-D- cellooligosaccharides, was developed and used in the study of exocellulases. The two

The influence of dietary fatty acids on tissue lipid composition in rainbow trout (Salmo gairdneri)

Creator:: Greene, Diana H.
Abstract:: The effects of different dietary lipids on the growth, nutrition and tissue lipid profiles of rainbow trout raised to market size on a commercially available ration were examined. Rainbow trout of 80 g mean initial weight were fed pellets prepared according to Oregon Moist Pellet specifications for 20 weeks. Salmon...
Resource Type:: Masters Thesis
Full Text:: choline phosphotransferase. D. Lipogenic Enzymes. In a series of feeding trials designed to

Endogenous proteinase and myosin gelation of arrowtooth flounder (Atheresthes stomias)

Creator:: Visessanguan, Wonnop
Abstract:: Proteolytic degradation of fish flesh occurring at elevated temperatures is the primary limitation for the commercial utilization of arrowtooth flounder (ATF). Characterization of the autolytic activity of ATF muscle incubated at various pHs and temperatures indicated the involvement of heat-activated proteinases active at acidic and alkaline pHs. Further characterization of...
Resource Type:: Dissertation
Full Text:: . Morrisey, Dr. Ronald E. Wrolstad, Dr. Alfred Menino, and Dr. Mary Ann Sward for serving as a graduate

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