Banca de DEFESA: MAGDA SOUZA VIANA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : MAGDA SOUZA VIANA
DATA : 28/11/2019
HORA: 14:00
LOCAL: Instituto Multidisciplinar em Saúde
TÍTULO:

PHOTONIC RESOURCES FOR MICROBIAL INHIBITION AND STIMULATION OF FERMENTATION OF MUST OF PURPLE GRAPE FOR RED WINE FABRICATION: EVALUATION OF THE INITIAL PROCESS

PALAVRAS-CHAVES:

Wine, grapes, LED, fermentation, photostimulation

PÁGINAS: 67
GRANDE ÁREA: Ciências da Saúde
ÁREA: Nutrição
RESUMO:

Wine is considered an alcoholic beverage resulting from the fermentation of grapes. For this, during the process of its production, several chemical reactions are provoked by the yeast, transforming the sugars present in the fruit in alcohol and later giving rise to drink. Obtaining quality wine depends on a number of prerequisites, including environmental factors and human intervention, which, when optimized, result in a significant increase in the quality of the initial process and consequently in the improvement of the final product. In this scenario, the search for improvements in the wine production process has been studied, one of them, analyzed by this work is the application of photostimulation, since light is able to accelerate the yeast metabolism leading to a reduction in the time spent on fermentation. without altering the quality of the drink, as already proven in studies with beer number of prerequisites, including environmental factors and human intervention, which, when optimized, result in a significant increase in the quality of the initial process and consequently in the improvement of the final. product. In this scenario, the search for improvements in the wine production process has been studied, one of which, analyzed by this work is the application of photostimulation, since light is able to accelerate the yeast metabolism leading to a reduction in the time spent on fermentation . without changing the quality of the drink, as proven in studies with beer. Thus, the present work aimed to evaluate the effects of Light Emitting Diodes (LEDs) on microbial selection, fermentation yield and productivity during the initial process of red wine production. The photonic reactors used in the process were made with four RGB (Red - Green - Blue) LED strips (MSS LED Lightining Co., Ltd., Shenzhen, Guangdong, China) measuring 10 cm in length, these strips were fixed to the outer walls. of a 12 x 100 mm glass test tube. Each ribbon contained 6 RGB LEDs, making up a total of 24 RGB LEDs. The reactors were inserted in elermayer containing grape must with yeast of the genus Saccharomyces, isolated from the grapes themselves. For groups that were evaluated for microbiological capacity, the blue LED light was used and for groups that were evaluated the productivity and yield of fermentation, the red light was used. In order to avoid interference from ambient light, in all groups irradiated with light the erlenmeyer containing the must was completely covered with film paper. When performing the intergroup analyzes, it can be observed that the LED was efficient in the bacterial decrease mainly at 48 and 72 hours of application, showing a statistically significant difference (p <0.001) when compared to all times of the Pure group (P24h, P48h and P72h) and at the 24 hour time of the Metabisulfite group (M24h). Another positive point was the alcohol content obtained in the samples that were irradiated with 525nm red LED, which obtained superior results when compared to all other groups (p <0.001) in the final time of 72 hours, showing that the light stimulates the production of ethanol by yeast. Thus, it can be seen that the use of blue (460 nm) and red (630 nm) lights has a positive effect on grape must both in the microbiological decontamination and ethanol production, and can thus be used as an innovative technique as a means of enhance and facilitate the production of red wine.

MEMBROS DA BANCA:
Externo ao Programa - 2861311 - BRUNO LOPES BASTOS
Interno - 1564303 - FRANCINE CRISTINA SILVA ROSA
Presidente - 1554172 - LUCIANO PEREIRA ROSA