Made available in DSpace on 2017-07-10T18:01:58Z (GMT). No. of bitstreams: 1 Loana Priscila Mangolin.pdf: 1056967 bytes, checksum: 1223b30adc3394f7eba1173af8f00a15 (MD5) Previous issue date: 2016-02-10 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Freshwater ecosystems are home to a wide variety of organizations and one of the animals groups that live in these ecosystems are the benthic macroinvertebrates. These animals are considered very important as they play a key role in energy transfer from the basal resources for the trophic levels more high food chains. Understanding how these groups are structured, their composition and diversity assists in the evaluation of the characteristics of the aquatic environment in which they live. Thus, to understand the taxa distribution patterns at different spatial and temporal scales, this study aimed to: I) Carry out a faunal survey in order to II) to verify the existence of spatial difference (between sampling points) and temporal (seasons) and III) possible relationships between some environmental factors with the distribution pattern of benthic macroinvertebrate community in an excerpt from a subtropical river (Rio São Francisco True) in the western region of Parana state. The study was conducted in a region near the city of Toledo during the period April 2013 to April 2014. The collections were fortnightly using artificial substrates also physico-chemical analysis of water were held, where the results were compared to standards Brazilian water quality pair freshwaters Class 2 (CONAMA n0 357/2005). The data were subjected to statistical analysis. On results there was a spatio-temporal variation in the composition and diversity of families of the benthic macroinvertebrate community where the smallest differences were found in point 6. The physico-chemical variables had influence in the distribution, diversity and composition of benthic macroinvertebrate community in which only point 6 met outside the standards allowed by CONAMA for Class 2. Based on the results, we can conclude that the analyzed stretch of the São Francisco True river is environmentally sound, except point 6 who suffers direct influence of the urban section of the city. / Os ecossistemas de água doce abrigam uma grande diversidade de organismos e um dos grupos de animais que vivem nesses ecossistemas são os macroinvertebrados bentônicos, Esses animais são considerados muito importantes, pois cumprem um papel fundamental na transferência de energia dos recursos basais para os níveis tróficos mais elevados das cadeias alimentares. Compreender como esses grupos se estruturam, a sua composição e diversidade auxilia na avaliação das características do ambiente aquático no qual eles habitam. Dessa forma, visando compreender os padrões de distribuição dos táxons em diferentes escalas espaciais e temporais, este estudo teve por objetivos: I) Realizar um levantamento taxonômico, a fim de II) verificar a existência de diferença espacial (entre os pontos de amostragem) e temporal (estações do ano) e III) possíveis relações entre alguns fatores ambientais com o padrão de distribuição da comunidade de macroinvertebrados bentônicos em um trecho de um rio subtropical (Rio São Francisco Verdadeiro) na região oeste do estado do Paraná. O estudo foi realizado em uma região próxima a cidade de Toledo, durante o período de abril de 2013 a abril de 2014. As coletas foram quinzenais, utilizando substratos artificiais Também foram realizadas analises físico-químicas da água, onde os resultados foram comparados aos padrões brasileiros de qualidade de água par as águas doces Classe 2 (Resolução CONAMA n0 357/2005). Os dados foram submetidos a analises estatísticas. Nos resultados obtidos verificou-se uma variação espaço-temporal na composição e diversidade de famílias da comunidade de macroinvertebrados bentônicos onde as menores diversidades foram encontradas no ponto 6. As variáveis físico-químicas tiveram influencia na distribuição, diversidade e composição da comunidade de macroinvertebrados bentônicos, no qual somente o ponto 6 encontrou-se fora dos padrões permitidos pelo CONAMA para Classe 2. Baseados nos resultados obtidos, pode-se concluir que o trecho analisado do rio São Francisco Verdadeiro encontra-se em boas condições ambientais, exceto o ponto 6, que sofre influência direta do trecho urbano da cidade.

Water is the most important and restrictive factor for the agricultural cultures so, the knowledge of its qualitative composition is important to the verticalization of productivity. For the microirrigation systems (located irrigation), its requirement in physical and chemical quality is bigger, because of the reduced diameter of its components, particularly the transmitters. The objective of this work was to characterize the superficial waters of UFSM campus in order to use them in microirrigation, trying to identify the levels of chemical and physical parameters that influence the irrigation system, ground and plant. Four principal dams of the UFSM were characterized (Área Nova,, Solos ,Madame ,and Várzea). Three samples were collected in each dam ,casually, one meter of depth, in two dates in January 2007, one before and other after precipitation completing 24 samples. The following parameters were analyzed: suspended solids ,dissolved solids, pH, electrical conductivity, calcium, magnesium, sodium ,phosphorus, nitrogen, boron, total iron and it was calculated the value of absorption of sodium. Determinations of laboratory and in situ were done. The study showed that relating to parameters, except total iron, the Nova Àrea dam revealed the greatest values, followed by the Solos dam, Madame and Várzea. Values significantly superior were observed due to the particular characteristic of the source contribution area. It was also verified that differences occurred in the levels of some parameters relating to the two dates of the collection, explained by the administration given to she spill basin of contribution area, because the grounds of dams are similar and are from the same map unit São Pedro. Relating to the use of these waters in microirrigation, it was verified that Nova Área and Solos dams have restrictions to that total iron level, suspended solids and pH. The calculated RAS, when compared with the electrical conductivity, was classified as a severe risk to the infiltration rate in all dams. It was concluded that differences in the studied parameters varied according to the given conduct to the spill and that Madame and Várzea dams would be used in microirrigation since their levels of calcium and magnesium in the ground are elevated / A água é para as culturas agrícolas o fator mais limitante e importante, portanto o conhecimento de sua composição qualitativa é relevante para a verticalização da produtividade. Em se tratando de sistemas de microirrigação (irrigação localizada), sua exigência em qualidade física e química é maior, devido ao diâmetro reduzido de seus componentes particularmente os emissores. Este trabalho teve por objetivo caracterizar as águas superficiais do campus da UFSM com vistas a sua utilização em microirrigação procurando identificar os níveis dos parâmetros químicos e físicos que possuem influência no sistema de irrigação, solo e planta. Foram caracterizados quatro principais açudes do campus da UFSM (Área Nova, Solos, Madame e Várzea). Realizou-se a coleta de 3 amostras por açude aleatoriamente a um metro de profundidade, em duas datas no mês de janeiro de 2007, uma anterior e outra após uma precipitação, perfazendo um total de 24 amostras. Foram analisados os seguintes parâmetros: sólidos suspensos, sólidos dissolvidos, pH, condutividade elétrica, cálcio, magnésio, sódio, potássio, fósforo, nitrogênio, boro, ferro total e calculado o valor da razão de adsorção de sódio. Foram realizadas determinações a campo e laboratoriais. O estudo indicou que em relação aos parâmetros, com exceção do ferro total, o açude da Área Nova revelou os maiores valores, seguido do açude dos Solos, Madame e Várzea. Observou-se valores significativamente superiores para o parâmetro ferro total no açude dos Solos, devido a característica particular da área de contribuição do manancial. Verificou-se também que ocorreram diferenças nos níveis de determinados parâmetros em relação às duas datas de coleta, explicado pelo manejo dado à bacia de entorno, pois os solos dos açudes são semelhantes e pertencentes à mesma unidade de mapeamento São Pedro. Com relação à utilização destas águas em microirrigação, constatou-se que os açudes da área Nova e dos Solos possuem restrições em relação ao nível de ferro total, sólidos suspensos e pH. A RAS calculada, quando comparada com os valores da condutividade elétrica, devido ao seu baixo valor, quando relacionado com a condutividade elétrica, foi classificada como de risco severo para taxa de infiltração em todos os açudes. Concluiu-se que as diferenças nos parâmetros estudados variaram conforme o manejo dado ao entorno e que os açudes da Madame e Várzea poderiam ser utilizados na microirrigação desde que se eleve os seus níveis de cálcio e magnésio no solo

At present, the extraction of biochar and its use is a much-discussed topic in the chemical and research fields. The use of biochar is very often declined in the areas of agriculture, waste management, environmental improvement and the fight against global warming. In addition to these sectors, the topic of biochar is also addressed in the production of bio-diesel and bio-oil. Due to the current use of secondary products during biotechnological processes, the presented theoretical and practical study focused on the issue of obtaining biochar from bran by pyrolysis at different temperatures. Part of the practical part was the extraction of biochar from bran and its subsequent analysis, which could be used to characterize biochar obtained from bran by pyrolysis physically and chemically. The characterization of bran biochar was solved by various analytical methods. These techniques yielded, for example, pH, conductivity, particle distribution, elemental composition of biochar, porosity and content of polycyclic aromatic hydrocarbons. Thanks to this study, the properties of biochar and its possible applications in everyday life were characterized in detail. Given the very promising use of biochar obtained from bran, it can be said that this will be a very desirable topic for the future.

Diploma thesis presents topic Classifying chemical reactions that was elaborated on the principle of inquiry based science education. The handbook for teachers, which is a part of the thesis, contains two variants of structured inquiry and two variants of guided inquiry. There are also methodical instructions for teachers, a list of chemicals, the procedure for carrying out the reactions and photo documentation of experiments, including measured graphs of pH and redox potential (PASCO probeware). Inquiry-based science education has the potential to develop key competences, which are becoming an important goal of education at all levels of education. The key competencies are included in the Czech curriculum, the Framework Educational Program for Grammar schools. The next part of the thesis was preparation of the questionnaire focused on developed key competencies. Students that performed laboratory session with the new developed material on topic classification of chemical reaction filled in the questionnaires after their work. The results showed that during the work students had the opportunity to develop five key competences.

Edamame is becoming more popular in the U.S. due to its high nutritional value and potential health benefits. However, more than 70% of edamame is imported from outside of the U.S. Therefore, developing elite edamame genotypes is critically desirable to increase the domestic production of edamame in the U.S. Genotype, planting location, and harvest time play essential roles in the chemical composition of edamame, which further decide edamame's nutritional value and sensory characteristics. Therefore, the first goal of this study is to comprehensively evaluate the chemical composition of edamame genotypes grown in different locations. Ten selected edamame genotypes were grown in three locations in the U.S. - Whitethorne, Virginia (VA), Little Rock, Arkansas (AR) and Painter, VA. Sugars, alanine, protein, oil, neutral detergent fiber (NDF), starch, ash, and moisture contents, were comprehensively analyzed. The results showed that location had significant effects on all chemical components of edamame with p < 0.05. Compared to Painter and Little Rock, genotypes planted in Whitethorne had higher averaged free sucrose, fructose, glucose, raffinose, stachyose, and starch contents and total sweetness. The highest crude protein and oil contents were found on edamame planted in Painter, while Little Rock produced edamame with the highest free alanine, ash, and moisture contents. Genotype significantly affected chemical compositions except for NDF and raffinose. Therefore, planting location and edamame genotype should be considered when producing elite edamame for the U.S. market. Chemical composition changes with the development of edamame; therefore, harvest time is essential for harvesting high-quality edamame. The second objective of this study is to quantify the changes in both physical and chemical properties of edamame over bean development and apply a combined spectroscopy and machine learning (ML) technique to help determine the optimal harvest time. Physical and chemical properties were analyzed for edamame harvested at R5 (beginning seed), R6 (full seed), and R7 (beginning maturity) growth stages, and the spectral reflectance (360 – 740 nm) of edamame pods was measured using a handheld spectrophotometer. The samples harvested at different stages were labeled as 'early,' 'ready,' and 'late.' At R6, pod/bean weight and pod thickness reached the peak and then stayed stable, while sugar, alanine, starch, and glycine also peaked at R6 but declined afterward. The spectra-based ML method had high accuracy (0.95) when classifying 'early' and 'late' edamame, and the accuracy was 0.87 for classifying 'early' and 'ready' edamame. These results indicated that this spectra-based ML method could determine the optimal harvest time of edamame. Food waste and loss not only lead to economic loss but also significant greenhouse gas emissions. With edamame food/snack production increasing, edamame shells, the low-value byproduct from this processing, will potentially threaten the environment. Similar to other food processing byproducts, edamame shell is rich in dietary fiber (DF). However, the high concentration of insoluble dietary fiber (IDF) limits its application as a food additive. Therefore, extraction/modification processes are needed to convert IDF to soluble dietary fiber (SDF) and improve the properties of edamame shell-derived DF. Ball milling is one of the most efficient techniques to break down biomaterials into sub-micro-level particles. Citric acid, as a natural and safe food additive, can help break down cell walls and improve the dissolution of SDF by ionizing the hydrogen ions with carboxyl groups. Therefore, the third objective of this study is to develop a process that combines ball milling and citric acid treatments to produce SDF from edamame shells. We investigated different treatment parameters, including different citric acid concentrations, treatment temperatures and time, and the application of ball milling. To determine if the combined treatment can potentially improve the properties of the produced SDFs, we characterized the physicochemical, morphological, structural, rheological, thermal, and functional properties of SDFs produced at different conditions. The results showed that the highest SDF yield (19.5%) was found when the edamame shells were pretreated by a ball mill. In addition, the combined citric acid and ball milling treatment altered several properties of the produced SDFs, including particle size, morphology, and crystallinity. Moreover, ball milling treatment led to a higher exothermic temperature peak of SDF indicating better thermal stability. All produced SDFs significantly elevated the production of short-chain fatty acids during in vitro fermentation (compared to the control fermentation) which indicated their potential benefits of promoting gut health. Overall, we demonstrated that ball-milling-assisted citric acid processing can be an effective green technique to produce SDF from edamame shells. The SDF produced from edamame shells can be regarded as a promising and novel ingredient with great potential to be used in foods. / Doctor of Philosophy / Edamame is becoming increasingly popular among consumers in the U.S. because it is nutritious and good for health. However, more than 70% of edamame in the U.S. market is imported from other countries. Therefore, having more edamame genotypes that adapt to the growing environment in the U.S. will help increase the domestic production of edamame. Genotype and planting location are essential in deciding edamame's nutritional value and taste. Therefore, the first objective of this study is to comprehensively understand the nutritional value of different edamame genotypes grown in three planting locations. The results showed that both location and genotype affected the nutritional values of edamame, indicating that planting location and edamame genotype should be considered when developing better edamame for the U.S. market. Nutritional value and sweetness change with the growth of edamame beans. Therefore, harvest time is crucial for harvesting edamame with better nutrition and taste. This study's second objective is to observe edamame's nutritional factors and sweetness over bean development and develop a method using a handheld colorimeter to help determine the optimal harvest time. The results showed that the edamame harvested at the full seed stage (called R6) is the sweetest compared to the other two stages. In addition, the handheld colorimeter combined with the machine learning technique showed high accuracy in separating 'early' and 'late' harvested edamame and 'early' and 'ready' harvested samples. These results indicated that the combination of colorimeter and machine learning could help determine the optimal harvest time of edamame. Food waste and loss not only lead to economic loss but also significant greenhouse gas emissions. Edamame shells, the low-value byproduct from edamame snack/food processing, will potentially threaten the environment if edamame consumption keeps increasing. Like other food waste, edamame shell is rich in dietary fiber (DF). Therefore, it is vital to find a way to recover the DF in edamame for other applications. Ball milling is a green technology that can efficiently break down big particles. Citric acid is a natural and safe food additive and can help break down insoluble cell walls. Therefore, this study aims to produce soluble dietary fiber (SDF) from edamame shells using ball milling and citric acid. We proved that ball-milling assisted acid processing can be an environmentally friendly method to produce edamame shell SDF which can potentially be used as a suitable food ingredient.

Soil fertility is an important component of forest ecosystem, yet evaluating soil fertility remains one of the least understood aspects of forest science. Phytocentric and geocenctric approaches were used to assess soil fertility in loblolly pine plantations throughout their geographic range in the United States. The model to assess soil fertility using a phytocentric approach was constructed using the relationship between site index and aboveground productivity. Geocentric models used physical and chemical properties of the A-horizon. Soil geocentric models were constructed using two modeling approaches. In the first approach, ordinary least squares methods of multiple regression were used to derive soil fertility estimated from site index using soil physical and chemical properties from the A-horizon. Ordinary least squares methods were found unsuitable due to multicollinearity among the soil variables. In the second approach, a multivariate modeling approach, partial least squares regression, was used to mitigate multicollinearity effects. The best model to quantify soil fertility using soil physical and chemical properties included N, Ca, Mg, C, and sand percentage as the significant predictors. The 3-PG process-based model was evaluated for simulating the response of loblolly pine to changes in soil fertility. Fertility rating (FR) is a parameter in 3-PG that scales soil fertility in the range of 0 to 1. FR values estimated from phytocentric and geocentric approaches were tested against observed production. The 3-PG model prediction of aboveground productivity described 89% percent of the variation in observed aboveground productivity using FR derived from site index and 84% percent of the vari- ation in observed aboveground productivity using FR derived from physical and chemical properties of the A-horizon. A response function to model dynamics of FR (∆FR) due to one time midrotatoin fertilization of N and P was developed using the Weibull function. The magnitude of ∆FR varied with intensity of N and time since application of fertilizer. The hypothesis that repeated fertilization with N and P eliminate major nutrient deficiency in the southeastern US was tested and a relationship between baseline fertility rating and fertilizer response was developed. An inverse relationship was observed between fertilizer response and baseline FR. / Ph. D.

Lithium-ion batteries are complex systems and making a simulation model of them is always challenging. A method for producing an accurate model with high capabilities for predicting the behavior of the battery in a time and cost efficient way is desired in this field of work. The aim of this thesis has been to develop a method to be close to the desired method as much as possible, especially in two important aspects, time and cost. The method which is the goal of this thesis should fulfill the below five requirements: 1. Able to produce a generic battery model for different types of lithium-ion batteries 2. No or low cost for the development of the model 3. A time span around one week for obtaining the model 4. Able to predict the most aspects of the battery’s behavior like the voltage, SOC, temperature and, preferably, simulate the degradation effects, safety and thermal aspects 5. Accuracy with less than 15% error The start point of this thesis was the study of current methods for cell modeling. Based on their approach, they are divided into three categories, abstract, black box and white box methods. Each of these methods has its own advantages and disadvantages, but none of them are able to fulfill the above requirements. This thesis presents a method, called “gray box”, which is, partially, a mix of the black and white boxes’ concepts. The gray box method uses values for model’s parameters from different sources. Firstly, some chemical/physical measurements like in the case of the white box method, secondly, some of the physical tests/experiments used in the case of the black box method and thirdly, information provided by cell datasheets, books, papers, journals and scientific databases. As practical part of this thesis, a prismatic cell, EIG C20 with 20Ah capacity was selected as the sample cell and its electrochemical model was produced with the proposed method. Some of the model’s parameters are measured and some others are estimated. Also, the abilities of AutoLion, a specialized software for lithium-ion battery modeling were used to accelerate the modeling process. Finally, the physical tests were used as part of the references for calculating the accuracy of the produced model. The results show that the gray box method can produce a model with nearly no cost, in less than one week and with error around 30% for the HPPC tests and, less than this, for the OCV and voltage tests. The proposed method could, largely, fulfill the five mentioned requirements. These results were achieved even without using any physical tests/experimental data for tuning the parameters, which is expected to reduce the error considerably. These are promising results for the idea of the gray box which is in its nascent stages and needs time to develop and be useful for commercial purposes.

Thesis (MScConsEcol (Conservation Ecology and Entomology))--Stellenbosch University, 2008. / This thesis examines the role of agricultural activity in the process of invasion of west coast renosterveld fragments by annual alien grass species. This highly endangered vegetation type has less than 5% remaining, it is vital to understand the mechanisms allowing invasion of annual alien grasses in order to effectively prevent the loss of the many rare and endemic species found in west coast renosterveld. This study was divided into three major components. Firstly the distribution of indigenous and alien plant species in relation to fence lines, separating active agricultural fields from untransformed vegetation, was described. Regression analysis was used to test for relationships between distances from agricultural fields and soil physical and chemical characteristics in natural vegetation. Cover by annual alien invasive grasses in untransformed vegetation decreased significantly with distance away from agricultural land. Secondly alien and indigenous grass seed banks were sampled along the transects, at the same sites, in order to establish whether the seed banks correlated with above ground cover. Results varied among sites and seed banks were correlated with the vegetation cover at only one site. It appears that there are a multitude of factors determining the distribution of annual alien grass cover. Thirdly a greenhouse experiment established the role that nitrogen plays in the success of the alien grass Avena fatua. This species was grown in competition with three indigenous species, an annual forb (Dimorphotheca pluvialis), a geophyte (Oxalis purpurea) and an indigenous perennial grass (Tribolium uniolae) at three levels of soil nitrogen. The geophyte was largely unaffected, while growth of the annual and indigenous perennial grasses was negatively affected by competition with A. fatua. Nitrogen did not seem to affect competitive interactions. Management of these renosterveld patches, in order to conserve them effectively, will require a multi-faceted approach, including prevention of further invasion and removal of invasive grasses already present.

Dviejų veiksnių mulčiavimo tyrimai buvo vykdyti 2004 – 2009 m. Lietuvos žemės ūkio universiteto Pomologiniame sode. 2010 m. tirtas organinių mulčių liekamasis poveikis. Visuose laukeliuose eilutėmis augintas valgomojo svogūno (Allium cepa) pasėlis. Atstumas tarp eilučių - 0,5 m. Nevartotos trąšos ir cheminės augalų apsaugos priemonės. Norint išsiaiškinti greitesnį organinių mulčių poveikį dirvožemio savybėms ir augančių augalų pasėliams, nuo 2004 m. nevartotos trąšos ir cheminės augalų apsaugos priemonės. Tyrimų variantai – veiksnys A - skirtingi organiniai mulčiai: Al - nemulčiuota (NE), A2 - šiaudai (ŠD), A3 - durpės (DU), A4 - pjuvenos (PJ), A5 - smulkinta žolė (ŽO), veiksnys B - mulčio sluoksnio storis: Bl - 5 cm, B2 - 10 cm. Pradinis bandymo laukelio ilgis 6 m., plotis 2 m., plotas 12 m2. Apskaitinio laukelio ilgis 5 m., plotis 1 m., plotas 5 m2. Variantai pakartojimuose išdėstyti rendomizuotai. Pakartojimai išdėstyti dviem eilėmis. Bandymas vykdytas 4 pakartojimais. Nustatyta, kad anksčiau įterpti organiniai mulčiai esmingai nepakeitė dirvožemio temperatūros, tačiau esmingai didino dirvožemio drėgnumą. Storesnis mulčio sluoksnis turėjo tendenciją didinti dirvožemio temperatūrą ir dirvožemio drėgnumą. Ilgametis organinių mulčių įterpimas esmingai nepakeitė dirvožemio pH, tačiau dirvožemio azotingumą esmingai didino šiaudų mulčias, o fosforingumą ir kalingumą esmingai didino šiaudų ir žolės mulčiai. Vegetacijos periodo metu piktžolių dygimas kito nevienodai... [toliau žr. visą tekstą] / Two factors mulching studies were carried out 2004 - 2009 in Lithuanian University of Agriculture Pomology garden. 2010 studied the residual effect of organic mulch. All lines grown in the fields of edible onion (Allium cepa) crops. The distance between the lines – 0,5 in Unused fertilizer and chemical plant protection measures. To find out more rapid organic mulches on soil properties and crop-growing plants since 2004 unused fertilizer and chemical plant protection measures. Study options - a factor - the different mulches in Al – no mulching (N) A2 - straw (ND), A3 - peat (DU), A4 - sawdust (PJ), A5 - minced herb (ZO), factor B - mulch thickness: BL - 5 cm, B2 - 10 cm. Initial field testing of length 6, width of 2, an area of 12 m2. Accounting field, length 5 m, width 1, the area 5 m-2. Variants rendomizuotai reps out. Reps set in two rows. The test is carried out by four repetitions. It was found that mulches before insert substantially changed the soil temperature, but substantially increased soil moisture. A thicker layer of mulch tended to increase soil temperature and soil moisture. Insert a long-time organic mulch on soil pH did not change substantially, however, substantially increased the soil nitrogen content of straw mulch, phosphorus and potassium and substantially increased the straw and grass mulches. During the growing season germination of weeds did not move. Short-emergence weed mulches had previously used sedative. Promoted the regeneration of perennial... [to full text]

Com o aparecimento crescente de diferentes formulações cosméticas a base de dimetilaminoetanol (DMAE) e seus diferentes sais, faz-se necessário desenvolvimento e validação de métodos analíticos para serem empregados controle de qualidade, tanto dos produtos acabados quanto das matérias-primas. O objetivo principal deste trabalho de pesquisa é propor duas metodologias analíticas (ressonância magnética nuclear 1H e eletroforese capilar) como ferramentas no controle de qualidade destes produtos Discutem-se também as técnicas de caracterização de matérias-primas contendo DMAE, bem como resultados obtidos em estudo de estabilidade acelerado. O método por ressonância magnética nuclear 1H foi validado usando água deuterada (amostras contendo DMAE bitartarato e DMAE base) dimetilsulfoxido (amostras contendo DMAE acetoamidobenzoato) como solventes. Os resultados obtidos foram confiáveis para todas as características de desempenho avaliadas na validação. Entre a desvantagem do metodo pode ser destacada a limitação do uso desta técnica nas amostras em creme e gel-creme. O método eletroforético foi completamente validado. Não foram observadas interferências e todos os parâmetros avaliados foram satisfatórios. Este método é simples e não requer tratamentos trabalhosos no preparo das amostras. Entre as vantagens do método destacam-se o pouco impacto ambiental e economia. O estudo de estabilidade acelerado não mostrou mudanças significativas em relação ao teor, porém, nas condições mais drásticas foram observadas mudanças em coloração e viscosidade aparente. / With the increasing amount of different cosmetic formulations containing dimetilaminoetanol (DMAE) and its salts, it is necessary to develop and validate analytical methods to be employed in the quality control of the active substances and commercial products. The primary purpose of this research to propose two analytical methodologies (nuclear magnetic resonance 1H and capillary electrophoresis) as tools to be used in the quality control of these products. It were also performed analysis for characterization of raw materials and stability studies of too cosmetic preparations. The nuclear magnetic resonance 1H method has been validated using deuterium oxide (for samples containing DMAE bitartrate and DMAE base) and DMSQ-d6 (for samples containing DMAE acetamidobenzoate) as solvents. The results were reliable for all the characteristics of performance evaluated in the validation. Nevertheless, the disadvantage of this method is the limited use this technique in the analysis of creams and gel-creams. The electrophoretic method has been fully validated. No interference was observed and all validation parameters evaluated were satisfactory. This method is simple and does not require laborious treatment for sample preparation. Among the advantages of this method is the little environmental impact and economics. The accelerated stability study showed no significant changes with regard to the content; the more drastic changes were observed in color and apparent viscosity.