@article{campbell_foegeding_velde_2017, title={A comparison of the lubrication behavior of whey protein model foods using tribology in linear and elliptical movement}, volume={48}, ISSN={["1745-4603"]}, DOI={10.1111/jtxs.12278}, abstractNote={AbstractLubrication is an important factor in the sensory evaluation of food products. Tribology provides a theoretical framework and instrumental methods for evaluating frictional properties between two moving surfaces and the lubrication behavior of products between these surfaces. Relating frictional measurements to sensory properties detected during oral processing requires careful and pertinent choices in surface materials and testing conditions. The aims of this study were to investigate: (a) differences in lubrication behavior of a range of food textures and (b) the differences between linear and elliptical movement and added saliva to understand the contribution of food structure to friction. Six whey protein model food samples, ranging in texture from fluid to semisolid to soft solid, were analyzed using a pin on disk tribometer to determine the coefficient of friction (COF) across a range of sliding speeds. The samples were analyzed in their initial form and post‐oral processing (n = 4) in both linear and elliptical movements. Elliptical movement slightly decreased coefficients of friction and extended the shape of the friction curve. Increases in test food viscosity decreased the COF but differences in viscosity were not apparent when test foods were mixed with saliva. Data correction for viscosity shifted the friction curves horizontally, indicating that lubrication had a greater impact upon friction than viscosity. This study provides initial insights for further comparison of linear and elliptical movement with a variety of sample compositions.Practical applicationsSensory perception of smoothness and creaminess are often major contributors to overall hedonic food liking and are a major reason why products high in fat and sugar are more highly preferred over other foods. These parameters are influenced by friction and lubrication between the tongue, palate, teeth, food products, and saliva during oral processing. Tribology provides an instrumental method to evaluate friction between moving surfaces that mimic oral surfaces and the lubrication behavior of foods. Trends in frictional measurements can be correlated with sensory ratings of the same foods to better understand why preferences exist for certain foods or food compositions and how to effectively improve the acceptability and enjoyment of healthier foods.}, number={4}, journal={JOURNAL OF TEXTURE STUDIES}, author={Campbell, Caroline L. and Foegeding, E. Allen and Velde, Fred}, year={2017}, month={Aug}, pages={335–341} }
 @article{foegeding_plundrich_schneider_campbell_lila_2017, title={Protein-polyphenol particles for delivering structural and health functionality}, volume={72}, ISSN={["1873-7137"]}, DOI={10.1016/j.foodhyd.2017.05.024}, abstractNote={Dietary proteins and polyphenols contribute both nutritive and extra-nutritional (disease-preventing and metabolism-enhancing) benefits, and can participate in food structure formation and stabilization. There is a desire to increase consumption of proteins and polyphenols based on health considerations, and one approach is to form protein-polyphenol particles that combine both health and structural functionality in food products. The roles of proteins and polyphenols individually, or when bound together, are discussed in terms of health benefits (nutrition, disease prevention, satiety, allergy alleviation) and impact on food structure. The overall goal should be a rational design of protein-polyphenol particles to ensure a positive contribution to food quality, protein nutrition, and delivery of a health-relevant dose of polyphenols to the gastrointestinal tract.}, journal={FOOD HYDROCOLLOIDS}, author={Foegeding, E. Allen and Plundrich, Nathalie and Schneider, Margaret and Campbell, Caroline and Lila, Mary Ann}, year={2017}, month={Nov}, pages={163–173} }
 @article{campbell_daubert_drake_foegeding_2016, title={An ISO-Protein Model Food System for Evaluating Food Texture Effects}, volume={47}, ISSN={["1745-4603"]}, DOI={10.1111/jtxs.12182}, abstractNote={AbstractPerceptions of food quality, acceptability and satiety are often driven by food texture. It is hypothesized that food texture alters satiety by adjusting eating rate and enjoyment; however, few studies have evaluated wide ranges of food textures with standardized nutritional compositions. The goal of this study was to formulate and characterize a set of isocaloric, macronutrient‐matched model foods with varying textures. Six distinct food textures were produced by varying the extent and type of aggregation of 11% whey protein isolate solutions. Textures were grouped into fluid‐like (fluid, thin and thick semisolids) and solid‐like (three soft solid gels) based on rheological and sensory properties. Increasing sample mechanical stiffness coincided with increasing cohesiveness in fluid‐like textures and decreasing cohesiveness in solid textures; total oral manipulations increased with increasing stiffness. Trends in sensory cohesiveness reflected that solid textures are fractured with the molars while fluid‐like textures are manipulated by tongue and jaw movements. These model foods demonstrated properties in the range of commercial food products. They are applicable to investigating structural mechanisms responsible for texture and satiety. A scheme was developed that outlines structural breakdown and coinciding perception of textural properties during oral processing.Practical ApplicationsUnderstanding the multidisciplinary relationships among food structure, texture, sensory perception, satiety and nutrient availability are fundamental in the formulation of healthy and enjoyable food products. However, the selection of products to evaluate the role of food structure upon texture and health is often difficult due to variations in macronutrients, total calories, and sample volume. This research provides a nutritionally standardized model food system that spans a textural spectrum of fluids, semisolids, and soft solids. The basic model foods presented here can be used to establish fundamental relationships between food structure and physiological outcomes. Additionally, these model foods can easily be reformulated to represent more complex structures (e.g., mixed gels, emulsions) or to evaluate the effects of added flavor or color.}, number={5}, journal={JOURNAL OF TEXTURE STUDIES}, author={Campbell, Caroline L. and Daubert, Christopher R. and Drake, Maryanne and Foegeding, E. Allen}, year={2016}, month={Oct}, pages={377–391} }
 @article{campbell_foegeding_harris_2016, title={Cocoa and Whey Protein Differentially Affect Markers of Lipid and Glucose Metabolism and Satiety}, volume={19}, ISSN={["1557-7600"]}, DOI={10.1089/jmf.2015.0044}, abstractNote={Food formulation with bioactive ingredients is a potential strategy to promote satiety and weight management. Whey proteins are high in leucine and are shown to decrease hunger ratings and increase satiety hormone levels; cocoa polyphenolics moderate glucose levels and slow digestion. This study examined the effects of cocoa and whey proteins on lipid and glucose metabolism and satiety in vitro and in a clinical trial. In vitro, 3T3-L1 preadipocytes were treated with 0.5-100 μg/mL cocoa polyphenolic extract (CPE) and/or 1-15 mM leucine (Leu) and assayed for lipid accumulation and leptin production. In vivo, a 6-week clinical trial consisted of nine panelists (age: 22.6 ± 1.7; BMI: 22.3 ± 2.1) consuming chocolate-protein beverages once per week, including placebo, whey protein isolate (WPI), low polyphenolic cocoa (LP), high polyphenolic cocoa (HP), LP-WPI, and HP-WPI. Measurements included blood glucose and adiponectin levels, and hunger ratings at baseline and 0.5-4.0 h following beverage consumption. At levels of 50 and 100 μg/mL, CPE significantly inhibited preadipocyte lipid accumulation by 35% and 50%, respectively, and by 22% and 36% when combined with 15 mM Leu. Leu treatment increased adipocyte leptin production by 26-37%. In the clinical trial, all beverages significantly moderated blood glucose levels 30 min postconsumption. WPI beverages elicited lowest peak glucose levels and HP levels were significantly lower than LP. The WPI and HP beverage treatments significantly increased adiponectin levels, but elicited no significant changes in hunger ratings. These trends suggest that combinations of WPI and cocoa polyphenols may improve markers of metabolic syndrome and satiety.}, number={3}, journal={JOURNAL OF MEDICINAL FOOD}, author={Campbell, Caroline L. and Foegeding, E. Allen and Harris, G. Keith}, year={2016}, month={Mar}, pages={219–227} }
 @article{foegeding_vinyard_essick_guest_campbell_2015, title={Transforming Structural Breakdown into Sensory Perception of Texture}, volume={46}, ISSN={["1745-4603"]}, DOI={10.1111/jtxs.12105}, abstractNote={AbstractFood structure research has historically focused on building and stabilizing specific structural elements. Precise execution of unit operations in food processing is required to ensure consistent structure formation, but does not explain why a particular structure is desirable. The pattern by which food structure breaks down during oral processing, generating texture, flavor and taste, determines the acceptability of a food. However, breakdown patterns and textural perception associated with desirable food qualities are not well understood. Food materials are classified based on their physical state (liquids, semisolids or solids) and interactions with surfaces (adhesive or nonadhesive). Physical and chemical processes during oral processing are used to further characterize each food category. Typical processes include particle reduction, dissolution, hydration, removal of food from oral surface and bolus formation. This review presents a framework for classifying food materials and material transformations during oral processing in order to identify their contributions to texture perception.Practical ApplicationsThere is a constant desire to reformulate or modify foods based on economic, sustainability, health and dietary considerations. One goal of a reformulated food is to change the composition but cause no significant changes in flavor, taste and textural properties associated with desirability. An alternative goal is to modulate a specific textural element to make the food more acceptable to a target population (e.g., those with compromised chewing ability). Both goals require an understanding of the fundamental elements that cause specific textural properties. This manuscript presents an overview of how the breakdown of food structure during oral processing generates the cognition of textural properties. Once textural properties are understood based on specific elements of structural transitions, this will allow for development of textures for specific market segments (e.g., vegan, gluten free or swallowing disorders) as well as the ability to control nutrient bioavailability and flavor release.}, number={3}, journal={JOURNAL OF TEXTURE STUDIES}, author={Foegeding, E. Allen and Vinyard, Christopher J. and Essick, Gregory and Guest, Steve and Campbell, Caroline}, year={2015}, month={Jun}, pages={152–170} }