In this study, flue gas emissions and combustion efficiencies during combustion and co-combustion of olive cake and coal are investigated in a bubbling fluidized bed with an inside diameter of 102 mm and a height of 900 mm and 1900 mm. Tun&ccedil / bilek lignite coal and Edremit olive cake were used in the experiments as fuels. Temperature distributions along the combustion column were continuously measured. Flue gas concentrations of O2, CO, SO2 and NOx were measured during combustion experiments. Four sets of experiments were performed in order to examine the effect of fuel composition, excess air ratio, freeboard extension and limestone addition on flue gas emissions and combustion efficiency. The olive cake addition to coal were 25, 50, 75 % by wt. The bed temperature on the average was 850 oC. The results of the experiments showed that coal combustion occurs at lower parts of the combustion column whereas olive cake combustion takes place more in the freeboard region. As olive cake percentage in the fuel mixture increased, CO emissions increased, SO2 and NOx emissions decreased. The reason for the decrease of NOx emissions with increasing percentage of olive cake in the fuel mixture was due to a reducing atmosphere created in the combustion column. Mostly combustion losses resulted mainly from the unburnt carbon in the fly ash. With the freeboard extension, noticeable decrease in CO emissions and slight increase in combustion efficiencies were observed. Among the limestones tested, &Ccedil / an limestone gave the best result with Ca/S = 3 at an optimum bed temperature of 850 oC. The SO2 reduction was 87% at this Ca/S ratio. For co-combustion experiments, it was observed that SO2 adsorption efficiency of limestone increased with the addition of olive cake to the fuel mixture.

Die Querstrom-Mikrofiltration mit Kapillarmembranen kommt zunehmend in den Bereichen Lebensmittel-, Pharma-, Chemieindustrie sowie in der Umwelttechnik zum Einsatz. Eine vollständige Beschreibung der Deckschichtbildung innerhalb der Membrananlage ist jedoch noch nicht gelungen. Der erste Teil dieser Arbeit widmet sich der Kuchenbildung in einer Kapillarmembran. Dabei werden sowohl Änderungen der Strömungsverhältnisse entlang der Kapillarlänge als auch Klassiereffekte bei der Querstrom-Mikrofiltration von polydispersen Stoffsystemen berücksichtigt. Die Modellberechnungen wurden mit Experimenten validiert. Weiterhin erfolgte die Untersuchung des Einflusses von polymeren Flockungsmitteln (PFM) auf die Mikrofiltration und der Möglichkeiten einer Filtratstromerhöhung durch Flockung mittels PFM. Es wird gezeigt, dass eine optimale Zudosierung von PFM existiert und diese mit einer maximalen Filtratstromerhöhung verbunden ist. Eine Überdosierung von PFM soll jedoch verhindert werden.

Phenolic compounds have attracted much attention due to numerous health benefits, including high antioxidant properties, reduced risk of cancer, and inhibition of digestive enzymes. Recent research has suggested that different phenolic compounds may interact with starch. The first objective was to investigate the effect of green or black tea extracts on hydrolysis of wheat, rice, corn, and potato starches. Cooking starches in the presence of either tea reduced their hydrolysis. Potato starch cooked with black tea was the most effective treatment. Observations suggested that hydrolysis may be affected by interactions and by impact on specific enzymes based on starch structure. The second objective was to determine if similar effect could be observed in product system. Addition of green tea extract to sponge cake significantly reduced in vitro starch digestibility, thus could reduce the expected glycemic index. In addition, significant increases in dietary fibre, resistant starch, and antioxidant properties were observed.

Novelty of the research. The investigation focused on five oil pumpkin varieties. Biochemical composition, sensory characteristics and nutritious value of oil pumpkin seeds as well as of oil, seed cake and fruit cake were established and compared in in the course of this investigation. This work established differencies among the genotype of varieties and correlative dependencies between chemical composition indices of pulp, seeds and oil of some pumpkins and meteorological conditions (duration of sunshine, precipitation, temperature). Chemical composition of oil pumpkin fruit pulp and oil depends on the variety genotipe. Meteorological conditions had stronger influence on chemical composition of oil pumpkin seeds than on that of their pulp: amounts of raw, NDF and MADF cellular tissues, raw proteins and crude fats were influenced by duration of sunshine and sum of active temperatures. Amount of precipitation stimulated accumulation of raw and NDF cellular tissue only. Practical value of the work. Big amount of valuable proteins, fats and mineral materials makes pulp, seeds, oil and cake of oil pumpkin fruits an alternative plant raw material for food and/or additive for development of innovative products. / Darbo mokslinis naujumas. Buvo tirtos penkios aliejinių moliūgų veislės. Eksperimento metu nustatyta ir palyginta ne tik aliejinių moliūgų sėklų, bet ir aliejaus, sėklų išspaudų, vaisiaus minkštimo biocheminė sudėtis, juslinės savybės ir maistinė vertė. Nustatyti skirtumai tarp veislių genotipo, koreliaciniai priklausomumai tarp kai kurių moliūgų minkštimo, sėklų, aliejaus cheminės sudėties rodiklių ir meteorologinių sąlygų (saulės spindėjimo trukmės, kritulių, temperatūros). Aliejinių moliūgų vaisių minkštimo bei aliejaus cheminė sudėtis prikluso nuo veislės genotipo. Meteorologinės sąlygos daugiau įtakos turėjo aliejinių moliūgų sėklų nei jų minkštimo cheminei sudėčiai: žalios, NDF ir MADF ląstelienų, žalių baltymų ir žalių riebalų kiekiams - saulės spindėjimo trukmė ir aktyvių temperatūrų suma. Iškritusių kritulių kiekis skatino tik žalios ir NDF ląstelienos kaupimąsi. Darbo praktinė vertė. Aliejinių moliūgų vaisiaus minkštimas, sėklos, aliejus ir išspaudos dėl juose esančio didelio kiekio vertingų baltymų, riebalų ir mineralinių medžiagų gali būti alternatyvi augalinė maisto žaliava ir/ar priedas inovatyviems produktams kurti.

In this study, combustion performances and emission characteristics of olive cake and olive cake+coal mixture are investigated in a bubbling fluidized bed of 102 mm inside diameter and 900 mm height. The average particle sizes of coal and olive cake used in the experiments were 1.57 mm and 1.52 mm, respectively. Flue gas concentrations of O2, CO, SO2, NOx, and total hydrocarbons (CmHn) were measured during combustion experiments. Operational parameters (excess air ratio, secondary air injection) were changed and variation of pollutant concentrations and combustion efficiency with these operational parameters were studied. The temperature profiles measured along the combustor column was found higher in the freeboard for olive cake than coal due to combustion of hydrocarbons mostly in the freeboard. The location of the maximum temperature in the freeboard shifted to the upper part of the column, as the volatile matter content in the fuel mixture increased. Combustion efficiencies in the range of 83.6-90.1% were obtained for olive cake with the excess air ratio of 1.12-2.30. The corresponding combustion efficiency for coal was 98.4-99.7% under the same conditions. As the CO and hydrocarbon concentration in the flue gas increased, the combustion efficiency decreased. Also co-combustion experiments of olive cake and coal for various mixing ratios were carried out. As the amount of olive cake in the fuel mixture increased, SO2 emissions decreased because of the very low sulfur content of olive cake. In order to increase the combustion efficiency, secondary air was injected into the freeboard which was a good solution to decrease the CO and hydrocarbon emissions, and to increase the combustion efficiency. For the setup used in this study, the optimum operating conditions with respect to NOx and SO2 emissions were found as 1.35 for excess air ratio, and 30 L/min for secondary air flowrate for the combustion of 75 wt% olive cake and 25 wt% coal mixture. Highest combustion efficiency of 99.8% was obtained with an excess air ratio of 1.7, secondary air flow rate of 40 L/min for the combustion of 25 wt% olive cake and 75 wt% coal mixture.

Fundação de Amparo a Pesquisa do Estado de Minas Gerais / In this study the adsorption capacity of coumponds benzene, toluene, ethylbenzene, p-xylene e o-xylene (BTEX) on Moringa oleifera seeds cake from aqueous solution was evaluate. The cake were obtained after oil extraction from the seeds with n-hexane. The BTEX compounds were selected because of the environmental impact caused by their presence in the water streams and their high toxicity. The Moringa oleifera seeds cake were characterized by thermogravimetric analysis, infrared spectroscopy, X ray diffraction and Point of Zero Charge. The variables of the adsorption process such as contact time and solution pH were studied to optimize the maximum adsorption conditions. The results obtained, contact time (20 min) and solution pH (7) were used for building the adsorption isotherms. The Langmuir and Freundlich linear isotherm models were applied to the experimental data to describe the adsorption process. The adsorption process was described satisfactorily by the Freundlich equation. This study shows that the Moringa oleifera seeds cake exhibits the good adsorption capacity and can be used for adsorbs BTEX in aqueous solution. / Neste estudo a capacidade de adsorção dos compostos benzeno, tolueno, etilbenzeno, p-xileno e o-xileno (BTEX) sobre a torta das sementes de Moringa oleifera em soluções aquosas foi avaliada. A torta foi obtida após extração do óleo das sementes com n-hexano. Os compostos BTEX foram selecionados, devido ao impacto ambiental ocasionado pela presença dos mesmos nos cursos d água e suas elevadas toxicidades. A torta das sementes de Moringa oleifera foi caracterizada por análise termogravimétrica, espectroscopia de infravermelho, difratometria de raios X e Ponto de Carga Zero. As variáveis do processo de adsorção, tais como, tempo de contato e pH da solução foram estudados para otimizar as condições de máxima adsorção. Os resultados obtidos, tempo de contato (20 min) e pH da solução (7), foram utilizados para a construção das isotermas de adsorção. Os modelos de isotermas lineares de Langmuir e Freundlich foram aplicados aos dados experimentais para descrever o processo de adsorção. O processo de adsorção foi satisfatoriamente descrito pela equação de Freundlich. Este estudo mostrou que a torta das sementes de Moringa oleifera apresenta boa capacidade de adsorção e pode ser usada para adsorver BTEX em soluções aquosas. / Mestre em Química

Fundação de Amparo a Pesquisa do Estado de Minas Gerais / Fertilizantes organominerais estão sendo utilizados para atender à necessidade nutricional das plantas e reduzir a dependência em relação aos adubos minerais. Essa prática aperfeiçoa o uso dos nutrientes pelas plantas e melhora a estrutura do solo devido à matéria orgânica presente nesses fertilizantes. Este trabalho teve como objetivo determinar o efeito de fontes de matéria orgânica utilizadas na composição de fertilizantes organominerais e compará-lo com o dos tradicionais adubos minerais no que diz respeito ao desenvolvimento inicial do sorgo. A pesquisa foi conduzida em casa de vegetação da Universidade Federal de Uberlândia, no município de Uberlândia, Minas Gerais, Brasil. Para a semeadura, foram utilizadas sementes de sorgo granífero, híbrido simples 1G100. O delineamento experimental foi o de blocos casualizados em esquema fatorial 4 x 3 + 2, sendo os fatores quatro níveis (50, 75, 100 e 125% de 450 kg ha-1, que é a dose recomendada para a cultura), três fontes de matéria orgânica para produção dos organominerais (lodo de esgoto, torta de filtro e turfa), o controle (adubação 100% mineral) e a testemunha (sem adubação). Cada parcela do experimento era composta por quatro plantas divididas em dois vasos. O solo utilizado foi o Latossolo Vermelho. No 30o e 60o dias após a semeadura, foram realizadas análises da altura da planta, diâmetro de caule, clorofila A, clorofila B e área foliar. Ao final desse período, as plantas foram retiradas do solo, e separou-se a parte área para secá-la em estufa de ar forçado e, em seguida, aferir-lhe a massa seca. O uso dos fertilizantes organominerais apresentou médias superiores às do controle e às da testemunha para quase todas as variáveis analisadas no 30o dia – a única exceção foi a variável diâmetro, em relação à qual os organominerais foram superiores apenas à testemunha. O sorgo fertilizado com organominerais continuou apresentando boas médias nas variáveis analisadas no 60o dia: mesmo com a redução da dose, foi possível observar médias similares àquelas encontradas para o controle. Para algumas variáveis, como o diâmetro e a massa seca da parte aérea, houve níveis de organominerais que foram superiores aos do controle e aos da testemunha. Portanto, nas condições e variáveis do presente trabalho, o uso de organominerais é capaz de substituir a adubação mineral no desenvolvimento inicial do sorgo, mesmo com a redução da dose aplicada. / Organo-mineral fertilizers have been used to both meet plants’ nutritional needs and reduce producers’ reliance on mineral fertilizers. This practice improves both the use of nutrients by plants and the soil structure due to the organic matter in these fertilizers. This study aimed to determine the effect of organic matter sources in the composition of organomineral fertilizers and compare it to the effect of traditional mineral fertilizers when it comes to the initial development of sorghum. Research was carried out in a greenhouse at the Federal University of Uberlandia, in Uberlandia, Minas Gerais, Brazil. Sorghum seeds of grain-bearing simple hybrid 1G100 were used in the seeding process. The experiment followed a randomized complete block design in a 4 x 3 + 2 factorial arrangement. Factors included four levels (50, 75, 100 and 125% of 450 kg ha-1, which is the recommended dose for sorghum crops), three organic matter sources in the composition of the organomineral fertilizers (sewage sludge, filter cake, and peat), a control (100% mineral fertilizer), and an untreated check (no fertilizers). Each experimental plot consisted of four plants divided into two pots. Oxisol was used in all pots. Analyses were performed at 30 and 60 days after seeding (DAS) and targeted: plant height, stem diameter, chlorophyll A, chlorophyll B, and leaf area. After this period, plants were removed from the soil, and had their aerial parts isolated to be dried in an air-forced oven before measurement of their dry mass. Means of the organomineral fertilizers outperformed those of both control and untreated check plots in almost all variables at 30 DAS. The only exception was variable stem diameter, in which organomineral fertilizers outperformed untreated check plots only. Sorghum fertilized with organomineral fertilizers also showed positive results in the variables analyzed at 60 DAS: even with dose reduction, their means were similar to those found in control plots. Organomineral fertilizers had higher means in some variables, such as diameter and dry mass of the aerial part, than both control and untreated check plots. In the conditions set in this study and considering the variables herein reported, organomineral fertilizers can substitute mineral fertilizers in the initial development of sorghum, even with some dose reductions. / Dissertação (Mestrado)

Submitted by Johnny Rodrigues (johnnyrodrigues@ufcg.edu.br) on 2018-10-18T15:17:48Z No. of bitstreams: 1 MARCONDES BARRETO DE SOUSA - DISSERTAÇÃO PPGEA 2007..pdf: 24830431 bytes, checksum: 7ec5ca4c602d197f350d861b27e55fd2 (MD5) / Made available in DSpace on 2018-10-18T15:17:48Z (GMT). No. of bitstreams: 1 MARCONDES BARRETO DE SOUSA - DISSERTAÇÃO PPGEA 2007..pdf: 24830431 bytes, checksum: 7ec5ca4c602d197f350d861b27e55fd2 (MD5) Previous issue date: 2007-03 / Capes / Realizou-se este trabalho com o objetivo de determinar as curvas de secagem e a umidade de equilíbrio higroscópico da torta e do farelo de mamona (Ricinus communis L.), a fim de estudar os efeitos das condições de secagem e armazenagem sobre a composição química (teor de óleo, umidade, matéria orgânica, cinzas e proteína bruta). A torta o e farelo de mamona foram secados nas temperaturas de 50, 60, 70 e 80°C, e nas espessuras de um, três e cinco cm e, posteriormente, armazenados em três tipos de embalagem (papel, naylon e plástico), pelo período de seis meses, nas condições climáticas de Campina Grande, PB. Os resultados da cinética de secagem foram ajustados pelos modelos matemáticos de Page e Thompson, com delineamento experimental dois (materiais) quatro (temperaturas) três (espessuras) e três (embalagens), no total de 72 tratamentos. Observou-se, com os resultados obtidos, que as curvas de secagem se ajustaram bem aos modelos matemáticos, apresentando coeficiente de determinação (R2) superior a 0,99. Nos componentes químicos avaliados não foram encontradas grandes alterações mas apenas um ganho maior de umidade nas embalagens de papel e naylon, em relação à embalagem de plástico, o que não ultrapassou os 7%. As cinzas e matéria orgânica permaneceram sem grandes variações e com relação ao teor de proteína, este diminuiu com o aumento da temperatura. / It accomplished this work with objective to determine the curves of dryness and moisture of equilibrium hygroscopic of the cake and bran of castor (Ricinus Communis L.), in order to study the effects of the conditions of dryness and storage about composition chemistry (purport of oil, moisture, organic matter, ashes and brutish protein). The cake and bran of castor were dried in temperature of 50, 60, 70 and 80°C, and thicknesses of one, three and five cm and later kept in three types of packings (paper, naylon and plastic) for one period of six months, in the climatic conditions from Campina Grande, PB. The effects in the kinetic of dryness went adjustable in the models mathematician by Page and Thompson, with delineately experimental two (materiais) four (temperatures) three (thicknesses) and three (packings) with one whole of 72 treatments. Of accord with the results got on, looked that with relation the curves of drynesses, these adjust well on the model mathematician showing coefficient of determination (R2) high 0,99. In the component chemists valued didn't go met large alterations, carne just a gain larger of moisture in packings of paper and naylon, at relation the packing of plastic, it didn't excel 7% the ashes and organic matter staid without big variations. In relation on the purport of protein, it reduced with increase of temperature.

Made available in DSpace on 2016-08-15T20:27:59Z (GMT). No. of bitstreams: 1 AntonioCLC_TESE.pdf: 1302444 bytes, checksum: e465e8b76dbdec077ba3f1534f5d9898 (MD5) Previous issue date: 2015-04-16 / Conselho Nacional de Desenvolvimento Científico e Tecnológico / Gossypol is a polyphenol compound produced by the pigment glands of cotton plants (Gossypium spp.) and presents proven deleterious action on spermatogenesis, rodent´s estrous cycle, granulosa cells steroidogenesis in pigs, early termination of pregnancy and embryonic development. However, the effects on sheep ovaries were not yet studied. This study was divided into two stages and aimed to determine in vitro and in vivo effect of gossypol on sheep ovarian follicles. In the first stage, eight ovarian fragments from each ewe were cultured in &#945;-MEM supplemented culture and subjected to three concentrations of gossypol-acetic acid (5, 10 and 20 µg/mL) for periods of 24 hours and seven days. In vitro action of gossypol resulted in a significant reduction in the number of viable ovarian follicles of all development stages, and a significant increase in the number of atretic follicles after 24 hours and seven days of cultivation (p < 0,01). In the latter it was remarkable the absence of viable antral follicles and the primordial follicles presented less than 50% of viability. In the second stage, we used twelve crossbred ewes, which were randomly divided into two groups and fed diets containing cottonseed cake or not (control group). Concentrate feed was offered at a rate of 1.5% of body weight of the animal for 63 days. Concentrations of total and free gossypol in cottonseed cake was 3.28 mg/g and 0.11 mg/g, respectively. Throughout the trial period no animal showed clinical signs of toxicosis. There was no interference on progesterone concentrations, weight, weight gain and ovaries measurements. Only occasional changes on vaginal cytology, hematological and biochemical parameters were noted. However, treatment with gossypol was responsible for significant reduction in the number of viable ovarian follicles (20.6% in treated sheep and 65.1% the control group) and significant increase in the number of atretic follicles (79.4% in treated sheep and 34.9% in control group), interfering at all stages of follicular development (p < 0,01). In conclusion, the gossypol promotes direct damage to the ovarian follicles of sheep, resulting in an increase on the proportion of atretic follicles and reduction of viable follicles both in vitro and in vivo / O gossipol é um composto polifenólico produzido pelas glândulas de pigmento do algodoeiro (Gossypium spp.); apresentando ação deletéria comprovada sobre a espermatogênese, ciclo estral de roedores, esteroidogênese nas células da granulosa em suínos, interrupção precoce da gestação e desenvolvimento embrionário inicial. No entanto, os efeitos sobre os ovários de ovelhas ainda não havia sido estudado. O presente estudo foi dividido em duas etapas: determinar o efeito in vitro e in vivo do gossipol sobre folículos ovarianos de ovelhas. Na primeira etapa, oito fragmentos ovarianos de cada animal foram cultivados em Meio &#945;-MEM suplementado e submetidas a cultivo em três concentrações de gossipol-ácido acético (5, 10 e 20 &#956;g/mL) por períodos de 24h e sete dias. A ação do gossipol in vitro proporcionou redução significativa no número de folículos viáveis em todos os estágios de desenvolvimento folicular; e aumento significativo no número de folículos atrésicos após 24h e sete dias de cultivo (p < 0,01). Neste último também foi notório a ausência de folículos antrais viáveis, e, os folículos primordiais apresentaram viabilidade inferior a 50%. Na segunda etapa, foram utilizadas doze ovelhas mestiças, que foram aleatoriamente separadas em dois grupos e alimentadas com rações contendo torta de algodão ou não (grupo controle). A ração foi oferecida na proporção de 1,5% do peso vivo do animal por 63 dias. As concentrações de gossipol total e livre na torta de algodão foram 3,28 mg/g e 0,11 mg/g, respectivamente. Durante todo o período experimental, nenhum animal apresentou qualquer sinal clínico de intoxicação. Não houve interferência sobre as concentrações de progesterona, peso, ganho em peso e medidas ovarianas. Apenas alterações ocasionais sobre a citologia vaginal, parâmetros hematológicos e bioquímicos foram evidenciadas. Entretanto, o tratamento com gossipol foi responsável por redução significante no número de folículos ovarianos viáveis (20,6% nas ovelhas tratadas e 65,1% no grupo controle) e aumento significante no número de folículos atrésicos (79,4% nas ovelhas tratadas e 34,9% no grupo controle), com interferência em todas as fases de desenvolvimento folicular (p < 0,01). Em conclusão, o gossipol promove danos diretos aos folículos ovarianos de ovelhas, resultando em aumento na proporção de folículos atrésicos e redução dos folículos viáveis tanto in vitro como in vivo

CAVALCANTE, Rosane Souza. Avaliação das características estruturais de bolos com redução calórica. 2012. 50 f. : Dissertação (mestrado) - Universidade Federal do Ceará, Departamento de Tecnologia de Alimentos, Programa de Pos-Graduação em Ciências e Tecnologia de Alimentos, Fortaleza-CE, 2012 / Submitted by Nádja Goes (nmoraissoares@gmail.com) on 2016-06-23T13:35:25Z No. of bitstreams: 1 2012_dis_rscavalcante.pdf: 1129788 bytes, checksum: 8f3b16ba9d7215549d158094e9a448d0 (MD5) / Approved for entry into archive by Nádja Goes (nmoraissoares@gmail.com) on 2016-06-23T13:35:40Z (GMT) No. of bitstreams: 1 2012_dis_rscavalcante.pdf: 1129788 bytes, checksum: 8f3b16ba9d7215549d158094e9a448d0 (MD5) / Made available in DSpace on 2016-06-23T13:35:40Z (GMT). No. of bitstreams: 1 2012_dis_rscavalcante.pdf: 1129788 bytes, checksum: 8f3b16ba9d7215549d158094e9a448d0 (MD5) Previous issue date: 2012 / The consumption of cakes with calorie reduction is growing, but has presented challenges to be overcome in the formation of its structure when the sugar or fat are replaced by sweeteners, gums, thickeners or fat substitutes. The present study was to investigate the internal characteristics of cakes with calorie reduction and viability of producing the same pattern similar to conventional cake. Initially, we defined the mixing time and mass of fat source to be used in the formulation, using as parameter the specific volume. Next, we determined the pattern of the cake formulation from a factorial experimental design of the simple type, measuring the specific volume and cell count. From this formulation, sucrose and fat were partially substituted for the production of calorie reduced cake. Replacement of sugar was made in proportion of a mixture of xanthan gum (1.5%) and sucralose (1%), while the zein was used to replace fat. In cakes with sugar lowering evaluated the specific volume (VE), the cell count (CC) of the cakes, the apparent viscosity of the mass and its thermal properties by differential scanning calorimetry (DSC). In cakes with reduced fat content, the analyzes were VE, CC and apparent viscosity. It was found that the cake with increased VE was prepared with one hydrogenated vegetable fat and one (1) minute of mixing the dough. The standard formulation was defined as having 155.88 and 28.78 shares of sugar and fat, respectively. As the sugar content decreased (10.00 to 52.17%) were reduced specific volume (1.94 to 0.7 ml / g) and cell counts (from 36.2 to 4.0 cells / cm ²) the cake and the apparent viscosity of the mass (337.56 to 631.40 cP). By reducing the fat content, there were no significant differences between the samples for VE, CC and viscosity, and viable to produce cake with reduced calorie fat replacing up to 46.86%. For the results, it was observed that replacement of sugar contributed more sharply than the replacement of fat in the formation of defects in the structure of the cake. Thermograms of the mass of standard and cakes with reduced sucrose suggested that the presence of sucralose can reduce the starch gelatinization temperature, accelerating the process and causing a compression of the structure during baking, thereby facilitating the coalescing of bubbles dispersed in mass. / O consumo de bolos com redução calórica vem crescendo, mas tem apresentado desafios a serem superados na formação da sua estrutura quando o açúcar ou a gordura são substituídos por adoçantes, gomas, espessantes ou substitutos de gordura. O presente trabalho propôs avaliar as características internas de bolos com redução calórica e a viabilidade de produção do mesmo com características similares ao bolo convencional. Inicialmente, foram definidos o tempo de mistura da massa e a fonte de gordura a ser utilizada na formulação, utilizando-se o volume específico como parâmetro. Em seguida, determinou-se a formulação do bolo padrão a partir de um delineamento experimental do tipo fatorial simples, medindo-se volume específico e a contagem de células. A partir dessa formulação, a sacarose e a gordura foram parcialmente substituídos para a produção de bolos com valor calórico reduzido. A substituição do açúcar foi feita proporcionalmente por uma mistura de goma xantana (1,5%) e sucralose (1%), enquanto a zeína foi usada para substituir a gordura. Nos bolos com redução de açúcar avaliou-se o volume específico (VE), a contagem de células (CC) dos bolos, a viscosidade aparente da massa e as suas propriedades térmicas por meio de calorimetria diferencial de varredura (DSC). Nos bolos com redução do teor de gordura, as análises realizadas foram VE, CC e viscosidade aparente. Verificou-se que o bolo com maior VE foi aquele elaborado com gordura vegetal hidrogenada e 1 (um) minuto de mistura da massa. A formulação padrão foi definida como tendo 155,88 e 28,78 partes de açúcar e de gordura, respectivamente. À medida que o teor de açúcar decresceu (10,00-52,17%) foram reduzidos o volume específico (1,94-0,7 mL/g) e a contagem de células (36,2 – 4,0 cél/cm²) do bolo e a viscosidade aparente da massa (337,56-631,40 cP). Com a redução do teor de gordura, não foram observadas diferenças significativas entre as amostras para VE, CC e viscosidade aparente, sendo viável a produção do bolo com redução calórica substituindo-se a gordura em até 46,86%. Pelos resultados encontrados, foi observado que a substituição do açúcar contribuiu mais acentuadamente que a substituição da gordura na formação de defeitos na estrutura do bolo. Os termogramas das massas dos bolos padrão e com redução de sacarose sugeriram que a presença de sucralose pode reduzir a temperatura de gelatinização do amido, acelerando esse processo e causando uma compactação da estrutura durante o assamento, favorecendo assim a coalescência das bolhas dispersas na massa.