Taísa Ceratti Treptow - UFSM

More documents

Recommendations

Info

ABSTRACT Master Dissertation Graduate Program on Food Science and Technology Federal University of Santa Maria RADIATION UV-C IN NIÁGARA WHITE, TREBBIANO, ISABELLA AND CABERNET SAUVIGNON AUTHOR: TAÍSA CERATTI TREPTOW ADVISER: CLÁUDIA KAEHLER SAUTTER Place and Date of Defense: Santa Maria, February 29 th , 2012. This study evaluated the UV-C irradiation in tissues of rachis with and without berries, and berries with stems of Vitis vinifera and Vitis labrusca. In berries of cv. Isabella, the volatile compounds were analyzed on days 2, 5 and 10 of storage at 20 ºC and the effect of UV-C irradiation on the 5 th day of storage. The experiments were based on four treatments of UV-C radiation (0, 1, 2 and 3 kJ m -2 ) with four cv. (Niagara white, Trebbiano, Cabernet sauvignon and Isabella) and evaluation times (three in berries and four rachis). The rachis with and without berries and the berries with stems remained stored at 20 ºC to evaluate physiological parameters. Ethylene production rate, respiratory rate and total polyphenols were evaluated in all tissues. Only in the rachis was determined by weight loss on days 1, 3 and 5, reducing sugars, non-reducing sugars on the 5 th day. Berries and the juice from the cv. Isabella the 5 th day of storage at 20 °C the total soluble solids (TSS), titratable acidity (TA), anthocyanins, total phenols, sugars and the ratio (TSS/ TA) were measured. In berries of cv. Isabella on days 2, 5 and 10 storage and berries irradiated with UV-C in amounts of 0, 1, 2 and 3 kJ m -2 , volatiles were extracted by solid phase microextration. After desorption, the volatile compounds were separated by gas chromatography, identified by mass spectrometry and quantified by flame ionization detector. For the sensory analysis of the juice discriminatory tests for paired comparison of difference and test ranking were used. The physiological response of UV-C irradiation depends on the cv. and the irradiated tissue. Only the rachis of grape Vitis labrusca ‗Niagara white‘ behaves climateric during storage in post-harvest and may reduce the self life of table grapes. This study found a possible hormetic dose of 3 kJ m -2 only for the cv. Isabella berry. 84 volatile compounds were detected over the days of storage. After 5 days storage, berries irradiated with UV-C 66 volatiles were found. And the dose of 3 kJ m -2 increased the concentration of esters and aldehydes, and 43,8% increase in the total polyphenols in berry. In the paired comparison test of difference, the judges showed greater intensity in the aroma of the juice from grapes irradiated. In the ranking test, the judges were unable to discriminate between different doses of irradiation, though differing dose control (0 kJ m -2 ) of the irradiated treatments. The analytical test enabled by gas chromatography to determine statistical differences between the different doses detected volatiles, especially at a dose of 3 kJ m -2 , in which panelists found no difference. Keywords: Vitis vinifera, Vitis labrusca, plant tissues, secondary metabolism, volatile compounds. 7
INTRODUÇÃO LISTA DE FIGURAS Figura 1 – Espectro eletromagnético..................................................................................... 18 Figura 2 – Esquema bioquímico dos processos que envolvem os compostos voláteis................................................................................................................................... 22 ARTIGO 1 Figura 1 – Perda de peso (%) em ráquis com diferentes doses de irradiação nos dias 1, 3 e 5 de armazenamento à 20 ºC nas cultivares Niágara branca,Trebbiano, Isabel, Cabernet sauvignon............................................................................................................................... 43 Figura 2 – Comportamento fisiológico ao longo do tempo de armazenamento dos tecidos vegetais ráquis e baga das cultivares Niágara branca e Trebbiano........................................... 44 ARTIGO 2 Figura 1 – Intensidade no aroma da uva ‗Isabel‘ com cinco dias de armazenamento a 20 °C 68 8
Page 1 and 2: UNIVERSIDADE FEDERAL DE SANTA MARIA
Page 4 and 5: DEDICATÓRIA Dedico esta dissertaç
Page 6 and 7: ―A vida é um movimento de assimi
Page 10 and 11: ARTIGO 1 LISTA DE TABELAS Tabela 1
Page 12 and 13: IBRAVIN - Instituto Brasileiro do V
Page 14 and 15: LISTA DE ANEXOS Anexo A - Modelo do
Page 16 and 17: INTRODUÇÃO Na busca por uma melho
Page 18 and 19: Entre uma diversidade de espécies,
Page 20 and 21: TREVES; PERL, 2002). A característ
Page 22 and 23: enefícios para saúde humana, entr
Page 24 and 25: A biossíntese dos terpenóides é
Page 26 and 27: hidroxicinâmico e isocumarinas (C9
Page 28 and 29: encontrada dose hormética. As ráq
Page 30 and 31: m -2 . Quanto à dose hormética pa
Page 32 and 33: A perda de peso das ráquis do ensa
Page 34 and 35: não foram afetadas pela radiação
Page 36 and 37: Entre os açúcares redutores e nã
Page 38 and 39: CHERVIN, C. et al. Ethylene seems r
Page 40 and 41: Tabela 1 - Taxa respiratória e de
Page 42 and 43: Tabela 3 - Parâmetros químicos no
Page 44 and 45: Figura 1 - Perda de peso (%) em rá
Page 46 and 47: ARTIGO 2 - COMPOSTOS VOLÁTEIS NA U
Page 48 and 49: áquis. A cultivar também é ampla
Page 50 and 51: Posteriormente, congeladas em nitro
Page 52 and 53: e Rossi (1965), com curva de calibr
Page 54 and 55: (aroma de anis) foi significativame
Page 56 and 57: álcoois 10,6%, ácidos e cetonas c
Page 58 and 59:
a 2-heptanona (aroma frutado) e art
Page 60 and 61:
Conclusão No período de armazenam
Page 62 and 63:
NELSON, N. A photometric adaptation
Page 64 and 65:
Nº Composto IK b IK c (ref.) Conce
Page 66 and 67:
Nº Composto IK b IK c (ref.) Conce
Page 68 and 69:
Tabela 4 - Intensidade dos atributo
Page 70 and 71:
DISCUSSÃO Durante todo o período
Page 72 and 73:
CONCLUSÃO A resposta fisiológica
Page 74 and 75:
CAMARGO, U. A.; MAIA, J. D. G. Sist
Page 76 and 77:
IOANNIDIS, P.; BONNER, L.; JOHNSON,
Page 78 and 79:
RIZZON, L. A.; MENEGUZZO, J. Sistem
Page 80 and 81:
ANEXOS 79
Page 82 and 83:
Anexo B - Modelo do teste discrimin
show all

Taísa Ceratti Treptow - UFSM

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?