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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Caracter?sticas bioativas, funcionais e efeito protetor do res?duo desidratado de camu-camu (Myrciaria dubia H.B.K. (McVaugh)) sobre doen?as degenerativas utilizando modelos in vivo C. elegans / Bioactive, functional and neuroprotective effects of dried camu-camu (Myrciaria dubia H.B.K. (McVaugh)) pomace using the in vivo model C. elegans

Azevedo, Juliana Chris Silva de 27 February 2015 (has links)
Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-03-22T00:26:39Z No. of bitstreams: 1 JulianaChrisSilvaDeAzevedo_TESE.pdf: 3335761 bytes, checksum: 5840f8f561d3f40aa1c1d8a4d26f2dce (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-03-22T23:34:50Z (GMT) No. of bitstreams: 1 JulianaChrisSilvaDeAzevedo_TESE.pdf: 3335761 bytes, checksum: 5840f8f561d3f40aa1c1d8a4d26f2dce (MD5) / Made available in DSpace on 2016-03-22T23:34:50Z (GMT). No. of bitstreams: 1 JulianaChrisSilvaDeAzevedo_TESE.pdf: 3335761 bytes, checksum: 5840f8f561d3f40aa1c1d8a4d26f2dce (MD5) Previous issue date: 2015-02-27 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico - CNPq / O camu-camu (Myrciaria dubia H.B.K. (McVaugh)) ? um fruto nativo da Regi?o Amaz?nica, que se tornou mundialmente conhecido por seu alto teor de ?cido asc?rbico. Devido a seu elevado grau de acidez, o fruto ? consumido principalmente como suco ou utilizado como ingrediente na prepara??o de alimentos. Dessa maneira, durante seu processamento s?o geradas quantidades consider?veis de res?duo agroindustrial. Apesar de estudos que apontam sua riqueza em compostos bioativos e efeitos biol?gicos, poucas s?o as informa??es sobre t?cnicas de transforma??o, aproveitamento e preserva??o dos frutos e de seu res?duo industrial, as quais poderiam ser empregadas em prol de sua utiliza??o funcional. Sendo assim, o presente trabalho teve como objetivo avaliar a aplica??o de dois processos de secagem, por convec??o em secador de bandejas e por liofiliza??o sobre o res?duo de camu-camu (constitu?do por casca e sementes com polpa aderida), visando obter um produto com qualidades funcionais. A presente tese foi dividida em tr?s etapas: a primeira etapa mostra os estudos relacionados ? secagem convectiva e liofiliza??o, na qual foi avaliado o impacto de ambos os processos sobre compostos bioativos selecionados, tomando o res?duo fresco como amostra controle. Dentre as condi??es estudadas, os grupos obtidos por convec??o a 50?C e 4 m/ s (SC50) e 80?C e 6 m/ s (SC80) apresentaram melhor combina??o de concentra??o de ?cido asc?rbico, capacidade redutora do Folin-Ciocalteau e caroten?ides totais, e foram selecionados para estudos complementares. Al?m disso, o res?duo liofilizado (RL) e o res?duo fresco (RF) foram investigados nas etapas posteriores da pesquisa. De maneira geral, foi observada maior concentra??o dos constituintes bioativos no grupo RF, seguido do RL e, por fim, os res?duos desidratados por convec??o, SC50 e SC80, respectivamente. Na segunda etapa, foram avaliadas atividades antioxidante, microbiol?gica e antienzim?tica, onde tamb?m foi observada a mesma tend?ncia nos resultados. Nessa etapa, foi identificada, pela primeira vez na literatura, a presen?a do ?cido sir?ngico no res?duo do camu-camu. A terceira parte desta tese abordou a investiga??o dos efeitos do res?duo de camu-camu desidratado sobre o envelhecimento e doen?as neurodegenerativas, utilizando o modelo in vivo C. elegans. Os extratos de camu-camu foram capazes de favorecer genes importantes das vias de ativa??o/inibi??o do estresse oxidativo e t?rmico (p < 0,05). Para o verme do tipo selvagem N2, as fra??es do extrato de baixo peso molecular PA (fase aquosa e polar ?cida), PB (fase aquosa e polar b?sica) e PN (fase org?nica e polar neutra) do grupo SC50 estenderam o tempo de vida em 20% e 13% (p < 0,001). Os resultados obtidos revelaram que a paralisia induzida pelo pept?deo Amil?ide ?1-42 associada a doen?a de Alzheimer, foi retardada significativamente (p < 0,0001) na linhagem CL4176. Da mesma forma, os extratos de camu-camu foram capazes de atenuar a indu??o dopamin?rgica associada ao mal de Parkinson. Finalmente, a an?lise global dos dados mostra que o res?duo de camucamu, co-produto obtido a partir de uma fruta nativa Brasileira, constitui uma fonte natural de compostos relevantes para a sa?de humana. Dessa forma, a presente tese mostra de maneira in?dita a multifuncionalidade desse produto ainda subaproveitado do ponto de vista cient?fico, comercial e tecnol?gico. / Camu-camu (Myrciaria dubia H.B.K. (McVaugh)) is a native Amazon fruit, recognized worldwide as one of the main natural sources of ascorbic acid. Due to its great acidity, this fruit is generally consumed after processing into juice or as ingredient in food preparations. As a co-product of the camu-camu processing, a significant amount of agroindustrial residue is generated. Despite the studies showing the bioactive value and biological potential of the fruit, few studies have approached the possible processing techniques, transformation and preservation of camu-camu fruits and its agroindustrial pomace. Therefore, the present work has the objective of evaluating two different drying processes applied to camu-camu pomace (peel and seeds with residual pulp), freeze drying and hot air drying, in order to obtain a functional fruit product. This thesis was divided into three stages: the first one shows the studies related to the freeze drying and hot air drying, where we demonstrated the impact of the selected drying techniques on the bioactive components of camu-camu, taking the fresh pomace as the control group. Among the investigated conditions, the groups obtained at 50?C and 4 m/s (SC50) and 80?C and 6 m/s (SC80) were selected as for further studies, based on their ascorbic acid final content and Folin-Ciocalteau reducing capacity. In addition to SC50 and SC80, the fresh pomace (RF) and freeze dried (RL) samples were also evaluated in these further stages of the research. Overall, the results show higher bioactive concentration in the RF samples, followed by RL, SC50 and SC80. On the second step of the research, the antioxidant, antimicrobial and antienzymatic activities were evaluated and the same tendency was observed. It was also reported, for the first time in the literature, the presence of syringic acid in dried camu-camu pomace. In the third and final stage of the research, it was investigated the effect of dried camu-camu on aging and neuroprotective disorders, using the in vivo model C.elegans. It was observed that camu-camu extracts were able to modulate important signaling genes relevant to thermal and oxidative stresses (p < 0.05). The polar acid, polar basic and polar neutral fractions obtained from the low molecular extracts of SC50 were able to extend the lifespan of wild type N2 C. elegans in 20% and 13% (p < 0.001). Results also showed that the paralysis induced by the ?1-42 amyloid was significantly (p < 0.0001) retarded in CL4176 worms. Similarly, the camu-camu extracts attenuated the dopaminergic induction associated to Parkinson?s disease. Finally, a global analysis of the data presented here reveal that the camu-camu pomace, a co-product obtained from the industrial processing of a native Brazilian fruit, is a relevant natural source of health relevant compounds. This thesis, shows for the first time, the multifunctionality of camu-camu pomace, a natural resource still underexploited for scientific, commercial and technological purposes.

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