Capsaicinoids are a class of compounds responsible for the "heat" of hot peppers. Capsaicin and dihydrocapsaicin have the highest burning effect. The aim of this work is to separate and quantify the two major capsaicinoids in fruits harvested at different stages of development and at different seasons. Simple and rapid HPLC method involves 73:27% methanol water mobile phase with C18 stationary phase and UV-Vis detector set at 210 nm. The method showed good reproducibility with 1.74% - 4.72% relative standard deviations, a linear response within 0.65–45.5 and 0.25-17.5 μg/mL for capsaicin and dihydrocapsaicin, respectively. The method achieved average recovery of 106% for capsaicin and 102% dihydrocapsaicin. Determination of capsaicinoids in four naturally grown chili and commercial source habanero were analyzed. The amount in the sample ranged from 1184-8156 μg/g for capsaicin and 430-3299 μg/g for dihydrocapsaicin.

Made available in DSpace on 2017-07-21T14:13:11Z (GMT). No. of bitstreams: 1 MARTINHA ANTUNES ALMEIDA1.pdf: 2864603 bytes, checksum: 067120c01fd21002ee39713f2ce0f36c (MD5) Previous issue date: 2013-02-27 / Capsaicinoids show several therapeutic uses. However they cause pungency in contact with skin and mucosae. In that sense, the aim of this study was to obtain microparticles of poly (-caprolactone) (PCL) containing capsaicinoids for prolonged release through the gastrointestinal tract in order to improve the treatment of obesity. Formulations containing 3, 5 and 10% capsaicinoids were successfully prepared by simple emulsion/solvent evaporation. Values of encapsulation efficiency above 90% were observed for these vanillylamide-loaded microparticles. Microparticles showed spherical shape and smooth surface. The size was suitable for oral use in order to provide a release through the gastrointestinal tract. No chemical bonds were observed between drug and polymer. Microencapsulation led to drug amorphization. Formulations prolonged the release of capsaicinoids without changing the release kinetics (biexponential model). Microencapsulation increased the gastric tolerability of capsaicin and dihydrocapsaicin because it prevented inflammatory processes in the stomach of rats. Microparticles containing 5% capsaicinoids had an effect similar to ranitidine and omeprazole in preventing ulcerative lesions induced by ethanol. This same formulation demonstrated a statistically significant reduction of Lee index, mesenteric fat and retroperitoneal fat in rats with obesity induced by hypothalamic lesion using monosodium L-glutamate. These rats also showed a remarkable improvement in lipid profile and glucose level compared to the control groups. Based on the experimental results, it is possible to suggest that capsaicinoids-loaded PCL microparticles are feasible approaches for the treatment of obesity. / Os capsaicinoides apresentam diversas aplicações terapêuticas, entretanto causam elevada pungência quando em contato com a pele e com as mucosas. Nesse sentido, o objetivo do presente trabalho foi desenvolver micropartículas de poli(-caprolactona) (PCL) contendo capsaicinoides para a liberação prolongada ao longo do trato gastrointestinal, com o propósito de otimizar o tratamento da obesidade. As formulações foram obtidas com sucesso pelo método de emulsão simples e evaporação do solvente, nas concentrações teóricas de 3, 5 e 10% de capsaicinoides. Valores de eficiência de encapsulação acima de 90% foram observados para todas as micropartículas contendo essas vanililamidas. As micropartículas apresentaram formato esférico e superfície lisa. O tamanho foi adequado para uso oral, a fim de permitir uma liberação ao longo do trato gastrointestinal. Não foi verificada a formação de ligações químicas entre o fármaco e o polímero. A microencapsulação promoveu a amorfização do fármaco. As formulações prolongaram a liberação dos capsaicinoides, sem alterar a cinética de liberação (modelo biexponencial). A microencapsulação foi capaz de aumentar a tolerância gástrica da capsaicina e da di-hidrocapsaicina, prevenindo a formação de processos inflamatórios no estômago dos ratos. As micropartículas contendo 5% de capsaicinoides tiveram efeito comparável à ranitidina e ao omeprazol na prevenção de lesões ulcerativas induzidas por etanol. Essa mesma formulação promoveu a redução estatisticamente significativa do índice de Lee, da gordura mesentérica e da gordura retroperitonial de ratos com obesidade induzida por lesão hipotalâmica utilizando L-glutamato monossódico. Esses ratos também apresentaram uma melhora expressiva no perfil lipídico e na glicemia, em comparação aos grupos controle. Com base nos resultados experimentais, é possível sugerir que as micropartículas de PCL contendo capsaicinoides são alternativas viáveis para o tratamento da obesidade.

Five separate field experiments were conducted across different environmental locations in Texas for the purpose of quantifying concentrations of different phytochemical groups (ascorbic acid, capsaicinoids, and flavonoids) within various pepper species, as well as, to identify the most optimum environment to promote expression of the aforementioned phytochemical. Depending on the particular experiment, quantitative measurements were then used in more detail in one of three ways: for identification of the most superior individuals and optimum environmental locations to express elevated concentrations of a particular phytochemical (first three experiments), to calculate heritability and % heterosis estimates for various fruit characteristics and phytochemical levels (fourth experiment), or for use in a specific biotechnology technique to potentially identify a molecular marker linked to elevated levels of ascorbic acid (AA) and flavonoids (quercetin and luteolin) (fifth experiment). In the first experiment, significant differences in fruit weight, capsaicin, and dihydrocapsaicin (DHC) were revealed in fruit tissue of five Habanero (Capsicum chinense) hybrids in comparison to a popular, commercial check (Kukulkan F1) after being grown across three different environmental locations (College Station, Uvalde, and Weslaco). Fruit grown at the Weslaco location was found to be larger and contained more capsaicin and DHC than those produced in Uvalde or College Station. While flavonoid contents were variable and low in all genotypes and locations, a few hybrids showed some potential for use in future crossing schemes to compete against the commercial check. Our results further suggested that variation in phytochemicals in fruit tissue of Habanero genotypes can be exploited by selecting in an appropriate environment. In the second experiment, analysis of four jalapeño hybrids in comparison to three commercial checks (Dragon, Ixtapa, and J1845), as well as, two cayenne hybrids in comparison to one commercial check (Mesilla) were compared after growing in three different locations (Amarillo, College Station, and Uvalde). Results demonstrated that the College Station location contributed to production of fruit containing higher concentrations of both AA and flavonoids, while those grown in Amarillo produced fruit with higher capsaicinoids. As expected, cayenne samples contained more AA and flavonoids than jalapeño samples. In comparison to the commercial jalapeño checks, all jalapeño hybrids generally expressed less capsaicinoids. With respect to AA and flavonoid concentrations, a few jalapeño hybrids proved to have some potential to compete against their respective commercial cultivars. For the cayenne market, one genotype revealed its potential use in mild markets and for farmers interested in a new hybrid expressing both appreciable levels of phytochemicals, as well as, more visually aesthetic attributes. Statistical analyses from the third experiment found all the F-values for each characteristic to be significant except the Location x Genotype (L x G) component for fruit wall thickness. For this experiment, a total of 21 different C. annuum (jalapeño, Serrano, and cayenne) genotypes were evaluated after growing in two diverse environmental locations (Uvalde and Weslaco). In general, peppers grown in Weslaco produced fruit with higher concentrations of AA and capsaicinoids, with a few exceptions, while fruit grown at Uvalde generally was larger in size and contained higher concentrations of flavonoids. In comparison to their respective commercial checks (jalapeño – Dragon, Tormenta; Serrano – Halcon, Magnum45; cayenne – Mesilla), a few hybrids were arguably more desirable for their respective markets with respect to different fruit measurements, AA, capsaicinoid, and flavonoid concentrations. This evidence further suggested the potential benefit this material could have for growers interested in replacing current material in the industry and to more successfully provide consumers with a healthier ingredient to better sustain their lives. In the fourth experiment, results confirmed our hypotheses that paprika type material has higher AA and flavonoid concentrations than Serrano peppers, while the opposite is possible for capsaicinoid expression. For this experiment, our goal was to identify the relative ease of incorporating different traits of interest into an improved specimen evaluating a combination of 29 F1 paprika and Serrano pepper (C. annuum) hybrids along with 19 of their respective parents. We were also able to identify how productive certain crossing combinations were at expressing a significant amount of positive heterosis for different characteristics of interest. From our correlation analyses, we were able to identify that a significant association can exist between fruit weight and fruit diameter, as well as when other characteristics were evaluated. In all, our results were able to reveal how effective certain combinations of parent material are towards production of offspring with improved traits expressing appreciable fruit characteristics and elevated phytochemical concentrations. Finally, the quantitative measurements produced in our F2 molecular marker experiment found significant amounts of variation for both flavonoids (quercetin and luteolin) and AA expression. It was evident that incorporation of the necessary genes of interest present within fruit tissue across this F2 family for these different phytochemicals were passed from ‘Ca377’ (P1) to several of these offspring. Three candidate primers were eventually identified for their potential polymorphic expression. However, after statistically analyzing the results, only one primer was identified as expressing a significant association (although the value was still relatively low) of variability with respect to luteolin. We also identified a significant association between quercetin and luteolin, quercetin and total flavonoids (quercetin+luteolin), as well as, luteolin and total flavonoids (quercetin+luteolin) in fruit tissues of different pepper material. From our results, we were able to arguably conclude that an environmental component may serve a more essential role in activating the necessary physiological processes to produce specific secondary metabolites. Although our RAPD technique was fairly straightforward and useful, some may argue that a more reliable technique would have been better. Therefore, we postulate that success may be possible in the near future if a different molecular marker technique is used.