Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1990. / Vita. Abstract. Includes bibliographical references (leaves 91-97). Also available via the Internet.

Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1990. / Vita. Abstract. Includes bibliographical references (leaves 47-48). Also available via the Internet.

Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1994. / Vita. Abstract. Includes bibliographical references (leaves 60-63). Also available via the Internet.

A crescente preocupação dos efeitos da ingestão de açúcar sobre a saúde tem levado a um aumento acentuado no consumo de adoçantes artificiais (ADDs). Ao mesmo tempo em que se nota elevada prevalência de obesidade, há também um aumento expressivo no número de produtos alimentícios com adoçantes artificiais. Objetivo. Caracterizar o perfil e analisar a atitude em relação ao consumo de ADD e alimentos dietéticos (ALDs) e sua relação com o excesso de peso corporal. Métodos. Estudo transversal com indivíduos com idades 20 anos, funcionários e docentes de universidades públicas do estado de São Paulo. Foi aplicado um questionário online com perguntas quanto ao uso de ADD e ALD e informações demográficas, socioeconômicas, antropométricas e de saúde. Verificaram-se associações entre as variáveis sócio-demográficas e antropométricas e o consumo de ADDs e ALD; utilizou-se análise de cluster para o reconhecimento de grupos homogêneos e regressão logística binária com cálculo do Odds-Ratio (OR). Resultados. Participaram do estudo 1323 indivíduos. A prevalência de uso de adoçante dietético foi 53,3 por cento , sendo maior entre aqueles com 30 a 60 anos. O peso médio foi de 72,03 kg e o IMC médio 25,26 kg/m2. As principais motivações foram a dificuldade de manter o peso corporal, não querer engordar e querer economizar calorias para poder consumir outros alimentos. A maioria possui o hábito de utilizar o adoçante na forma líquida, e os mais consumidos são sacarina e ciclamato de sódio, aspartame e sucralose. A quantidade média para adoçar uma porção de líquidos foi de 5,0 gotas. Em relação ao consumo de ALDs, a prevalência foi de 52,5 por cento , sendo refrigerantes, sucos de fruta, barras de cereal e iogurtes. No modelo de regressão logística, as variáveis associadas com o consumo de ADDs foram sexo, idade, DM, dificuldade em manter o peso e consumo de alimentos dietéticos. Para os ALDs, os fatores associados foram renda, sexo, DM, dificuldade em manter o peso, frequência da prática de atividade física e consumo de ADDs. Conclusão. O perfil do consumidor de adoçantes e alimentos dietéticos é formado principalmente por indivíduos com excesso de peso, dificuldade em manter o peso, não diabéticos e não hipertensos. Tanto para ADD como para ALD, a maior chance de consumi-los está entre aqueles que buscam esses produtos para controle do peso corporal ou do DM. Os indivíduos com excesso de peso e que possuem dificuldade para manter o peso corporal consomem mais adoçantes em relação aos eutróficos. / The growing concern of the effects of sugar intake on health has led to a sharp increase in the consumption of artificial sweeteners (ADDs). At the same time that the high prevalence of obesity, we note there is also a significant increase in the number of food products with artificial sweeteners. Objective. To characterize the profile and analyze the attitude towards the consumption of ADD and diet foods (ALDs) and its relationship with excess body weight. Methods. Cross sectional study with individuals aged 20 years, employees and professors of public universities in the state of São Paulo. An online questionnaire was applied with questions about the use of ADD and ALD and sociodemographic, anthropometric and health information. Associations between socio-demographic and anthropometric variables and the consumption of ADDs and ALD were analyzed. It was used the cluster analysis to the recognition of homogeneous groups and binary logistic regression to calculate the odds ratios (OR). Results. The study included 1323 individuals. The prevalence of use of artificial sweetener was 53.3 per cent , being higher among those aged 30 to 60 years. The mean weight was 72.03 kg and the mean BMI 25.26 kg / m2. The main reasons to consume ADD were the difficulty to maintain body weight, \"not wanting to get fat\" and \"want to save calories to be able to consume other foods.\" Most have the habit of using the sweetener in liquid form, and the most consumed sweeteners were saccharin and sodium cyclamate, aspartame and sucralose. The average amount to sweeten a portion of liquid was 5.0 drops. Regarding use of ALDs, the prevalence was 52.5 per cent , and soft drinks, fruit juices, cereal bars and yoghurts. In the logistic regression model, the variables associated with the consumption of ADDs were gender, age, DM, difficulty maintaining weight and consumption of diet foods. For ALDs, associated factors were income, gender, DM, difficulty maintaining weight, frequency of physical activity and consumption of ADDs. Conclusion. The consumer profile of artificial sweeteners and diet foods is mainly formed by individuals with overweight, difficulty maintaining weight, non-diabetic and non-hypertensive. Both for ADD and for ALD, the greater chance of consuming them is between those who seek these products to control weight or DM. Individuals who are overweight and have difficulty maintaining body weight consume more ADD than normal individuals.

No description available.

A crescente preocupação dos efeitos da ingestão de açúcar sobre a saúde tem levado a um aumento acentuado no consumo de adoçantes artificiais (ADDs). Ao mesmo tempo em que se nota elevada prevalência de obesidade, há também um aumento expressivo no número de produtos alimentícios com adoçantes artificiais. Objetivo. Caracterizar o perfil e analisar a atitude em relação ao consumo de ADD e alimentos dietéticos (ALDs) e sua relação com o excesso de peso corporal. Métodos. Estudo transversal com indivíduos com idades 20 anos, funcionários e docentes de universidades públicas do estado de São Paulo. Foi aplicado um questionário online com perguntas quanto ao uso de ADD e ALD e informações demográficas, socioeconômicas, antropométricas e de saúde. Verificaram-se associações entre as variáveis sócio-demográficas e antropométricas e o consumo de ADDs e ALD; utilizou-se análise de cluster para o reconhecimento de grupos homogêneos e regressão logística binária com cálculo do Odds-Ratio (OR). Resultados. Participaram do estudo 1323 indivíduos. A prevalência de uso de adoçante dietético foi 53,3 por cento , sendo maior entre aqueles com 30 a 60 anos. O peso médio foi de 72,03 kg e o IMC médio 25,26 kg/m2. As principais motivações foram a dificuldade de manter o peso corporal, não querer engordar e querer economizar calorias para poder consumir outros alimentos. A maioria possui o hábito de utilizar o adoçante na forma líquida, e os mais consumidos são sacarina e ciclamato de sódio, aspartame e sucralose. A quantidade média para adoçar uma porção de líquidos foi de 5,0 gotas. Em relação ao consumo de ALDs, a prevalência foi de 52,5 por cento , sendo refrigerantes, sucos de fruta, barras de cereal e iogurtes. No modelo de regressão logística, as variáveis associadas com o consumo de ADDs foram sexo, idade, DM, dificuldade em manter o peso e consumo de alimentos dietéticos. Para os ALDs, os fatores associados foram renda, sexo, DM, dificuldade em manter o peso, frequência da prática de atividade física e consumo de ADDs. Conclusão. O perfil do consumidor de adoçantes e alimentos dietéticos é formado principalmente por indivíduos com excesso de peso, dificuldade em manter o peso, não diabéticos e não hipertensos. Tanto para ADD como para ALD, a maior chance de consumi-los está entre aqueles que buscam esses produtos para controle do peso corporal ou do DM. Os indivíduos com excesso de peso e que possuem dificuldade para manter o peso corporal consomem mais adoçantes em relação aos eutróficos. / The growing concern of the effects of sugar intake on health has led to a sharp increase in the consumption of artificial sweeteners (ADDs). At the same time that the high prevalence of obesity, we note there is also a significant increase in the number of food products with artificial sweeteners. Objective. To characterize the profile and analyze the attitude towards the consumption of ADD and diet foods (ALDs) and its relationship with excess body weight. Methods. Cross sectional study with individuals aged 20 years, employees and professors of public universities in the state of São Paulo. An online questionnaire was applied with questions about the use of ADD and ALD and sociodemographic, anthropometric and health information. Associations between socio-demographic and anthropometric variables and the consumption of ADDs and ALD were analyzed. It was used the cluster analysis to the recognition of homogeneous groups and binary logistic regression to calculate the odds ratios (OR). Results. The study included 1323 individuals. The prevalence of use of artificial sweetener was 53.3 per cent , being higher among those aged 30 to 60 years. The mean weight was 72.03 kg and the mean BMI 25.26 kg / m2. The main reasons to consume ADD were the difficulty to maintain body weight, \"not wanting to get fat\" and \"want to save calories to be able to consume other foods.\" Most have the habit of using the sweetener in liquid form, and the most consumed sweeteners were saccharin and sodium cyclamate, aspartame and sucralose. The average amount to sweeten a portion of liquid was 5.0 drops. Regarding use of ALDs, the prevalence was 52.5 per cent , and soft drinks, fruit juices, cereal bars and yoghurts. In the logistic regression model, the variables associated with the consumption of ADDs were gender, age, DM, difficulty maintaining weight and consumption of diet foods. For ALDs, associated factors were income, gender, DM, difficulty maintaining weight, frequency of physical activity and consumption of ADDs. Conclusion. The consumer profile of artificial sweeteners and diet foods is mainly formed by individuals with overweight, difficulty maintaining weight, non-diabetic and non-hypertensive. Both for ADD and for ALD, the greater chance of consuming them is between those who seek these products to control weight or DM. Individuals who are overweight and have difficulty maintaining body weight consume more ADD than normal individuals.

The relationships among artificial sweetener consumption, body weight, and energy intake were examined using a rat model and a survey of college students. The rats were divided into four treatment groups and one control group (n=10 per group). Group 1 was provided with a 10% sucrose solution; group 2, a 50% sucrose solution; group 3, a 0.05% aspartame solution; and group 4, a 0.25% aspartame solution. All groups were provided with rat chow and water ad libitum. Analysis of variance (ANOVA) and Duncan's multiple range test were used to evaluate the data from the rat study. No differences existed among the groups for weight gain or total energy intake. Differences did exist among the groups for solution and food intake with the two groups given sucrose consuming the greatest amount of sweetened solution and the least amount of food. In the survey of college students, the human subjects' gender, perception of their weight, weight status, dieting status, weight consciousness, weight change over a one year period, and total caloric intake/ total energy expenditure were examined in relation to their consumption of diet soda and packets of table top artificial sweeteners. / Master of Science

Because of the increased demand for low calorie products, more products are being sweetened with artificial sweeteners. Perceived sweetness may be affected by other food ingredients, such as hydrocolloids. The purpose of this study was to examine the effects of xanthan gum, carboxymethyicellulose-low, and carboxymethylcellulose-medium on the attributes of a lemon flavored beverage sweetened with an artificial sweetener. Each hydrocolloid was added to the beverages to attain the following viscosities - 10 cps, 15 cps, and 20 Ctps. The table top formulations of artificial sweeteners used to sweeten the beverage samples were Sweet One® (contains acesulfame-K) and Equal® (contains aspartame). A modified Quantitative Descriptive Analysis method was used as the sensory evaluation technique to determine the intensity of sourness, sweetness, lemon flavor, bitterness, and aftertaste in the beverages of varying viscosities. In the samples containing Sweet One®, CMC-L increased sweetness whereas in the samples containing Equal®, sweetness first decreased significantly before increasing with increasing viscosity. CMC-M did not Significantly affect the sweetness of either sweetener although it tended to decrease the sweetness of Equal®. CMC-L and CMC-M decreased lemon flavor and sourness in the samples with both sweeteners; CMC-L decreased the intensity of these attributes more than CMC-M. The only significant change caused by the addition of xanthan gum to the beverages was a decrease in the sweetness of the samples sweetened with Equal®. Xanthan gum affected the attributes of the lemon flavored beverages the least whereas CMC-L had the greatest effect on the attributes. / Master of Science

N-Flate™ and a sweetening system of 1.5% aspartame, 35.5% fructose, and 63% polydextrose (AFP) were evaluated for their potential as fat and sugar substitutes, respectively. Four cupcake variations were prepared to compare the effects of replacing shortening with N-Flate™, and sugar with AFP. The four variations were shortening/sugar, shortening/AFP, N-Flate™/sugar, and N-Flate™/AFP. The evaluation involved objective measurements of the batter and the baked cupcakes, and sensory evaluation of the cupcakes. Results of the objective measurements showed that the batter from the two variations prepared with N-Flate™ had a Significantly higher pH and specific gravity than the two variations prepared with shortening. A lower cake volume, a firmer texture, a higher moisture content, and a darker crumb color were also observed in the two variations prepared with N-Flate™. The batter from the two variations prepared with AFP also had a higher pH and specific gravity than the two variations prepared with sugar. A lower cake volume, a firmer texture, a higher moisture content, and a lighter crust color were also observed in the two variations prepared with AFP. Among the objective measurements, interaction effects were significant for specific gravity, volume, crust color and tenderness. Sensory evaluation results showed that the two variations prepared with N-Flate™ were less tender and have poorer cell uniformity than those prepared with shortening. Variations prepared with AFP were found to be less moist, have a more bitter crust and crumb, and better cell uniformity than those prepared with sugar. No interaction effects were observed for any of the sensory attributes. / Master of Science

Submitted in fulfillment of the requirements of the degree of Doctor of Philosophy in Chemistry, Durban University of Technology, 2015. / Materials which show sweetness are classified as nutritive sweeteners and non-nutritive sweeteners or artificial sweeteners. In the present work, capillary electrophoresis and electrochemical biosensors have been used to analyse and quantify the natural and chemical artificial sweeteners in different food samples. The experimental work was further supported by computational studies. Capillary electrophoresis (CE) is a technique in which charged molecules can efficiently be separated in a buffer solution within a capillary tube under the influence of a strong electric field. While in the case of a biosensor, the analyte interacts with the bioreceptor and the resulting output is measured by a specially designed transducer. Steviol glycosides (rebaudioside A and stevioside) are natural sweeteners, extracted from Stevia rebaudiana Bertoni belonging to the Asteraceae family. On the other hand, neotame and sucralose are chemical sweeteners manufactured from their structural analogues aspartame and sucrose, respectively. Accordingly in this work, two CE modes, namely electro kinetic chromatography–capillary electrophoresis (EKC–CE) and an indirect UV-Capillary zone electrophoresis were used for the evaluation of analytes studied. Steviol glycosides (rebaudioside A and stevioside) and neotame diastereomers (L,L and D,D) were analysed using EKC-CE in the presence of a chiral separating agent β-cyclodextrin (TM-β-CD). However, since sucralose demonstrates chromophore-like properties, an indirect UV-CZE method was therefore developed using simple amines (morpholine, piperidine, ethylamine and triethylamine) as the background electrolytes (BGE). The optimum separation conditions in EKC-CE were; UV detection at 210 nm, 50 mM phosphate buffer, 30 mM TM-β-CD, 20 kV applied voltage, 5 s hydrodynamic injection and pH of 8.0 and 5.5 (for steviol glycosides and neotame), respectively. On the other hand, optimum separation conditions for the indirect UV-CZE method were; UV detection at 230 nm, 0.2 M morpholine buffer at pH 12.0, +20 kV applied voltage, 30 0C cassette temperature and 6 s sample injection. Furthermore, a highly sensitive and novel electrochemical biosensor was developed using platinum and glassy carbon electrodes fabricated with different nanomaterials. Accordingly, cytochrome c/graphene oxide – gold NPs/multiwalled carbon nanotubes (MWCNTs) modified platinum electrodes were used for the analysis of rebaudioside A. Similarly, copper NPs capped with ammonium piperidine dithiocarbamate-MWCNTs-β-cyclodextrin and laccase/2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) immobilized graphene oxide-p-aminothiophenol capped ZnO NPs nanocomposites modified with glassy carbon electrodes were developed for the determination of neotame and sucralose, respectively. The electrochemical behaviour of these sweeteners towards the developed sensors was tested by using cyclic voltammetry and differential pulse voltammetry under optimum experimental conditions (pH, scan rate, accumulation time, accumulation potential, pulse amplitude, voltage step and voltage step time). The prepared nanocomposites were characterized using thermogravimetric analysis (TGA), fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and transmission electron microscopy (TEM) techniques. It was found that the developed electrochemical biosensors showed excellent catalytic activity towards the determination of natural and chemical sweeteners in commercially available food samples. Additionally, a comparative study between capillary electrophoresis and biosensor methods revealed that at optimum experimental conditions, typical detection limits ranging from 0.02017 to 0.07386 mM for steviol glycosides, 0.01857 to 0.08214 mM for neotame diastereomers and for sucralose 0.2804 mM were achieved. In contrast to CE methods, biosensor methods attained very low detection limits of 0.264 µM, 0.013 mM and 0.325 µM for rebaudioside A, neotame and sucralose, respectively. The unique properties of the nanomaterials in combination with electro chemical techniques provided best results with shorter analysis time in contrast to the conventional separation methods. Finally, the computational molecular modelling tools were used to better understand the results obtained from the separation mechanisms using capillary electrophoresis. The interaction of β-cyclodextrin with steviol glycosides/neotame diastereomers and sucralose with the amine buffers were studied and the computational results were in good agreement with the elution orders observed in capillary electrophoresis. Furthermore, docking studies were performed to predict the binding affinity interactions between the artificial sweeteners and biomolecules (cytochrome c and laccase) to understand a molecular level.