Banca de QUALIFICAÇÃO: SAYMON MENEZES DE SOUZA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : SAYMON MENEZES DE SOUZA
DATE: 06/05/2021
TIME: 13:00
LOCAL: Google meet meet.google.com/rxz-afdm-hmm
TITLE:

SANITIZING STAINLESS STEEL SURFACES WITH BACTERIAL BIOFILM ADHESION

KEY WORDS:

Keywords: contamination; dairy; nanotechnology; biofilm control; nanosanitizing agents.

PAGES: 76
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Tecnologia Química
SPECIALTY: Alimentos
SUMMARY:

The presence of bacterial biofilms in dairy products, in addition to increasing the rates of surface corrosion, reducing the efficiency of heat transfer, reducing the flow in the pipes, reducing the final quality of the product and generating economic losses, also causes diseases carried by food. Due to the large number of cases of diseases caused by contaminated food, chemical treatments are applied in an attempt to reduce this problem. Despite this, there are limitations regarding the use of these treatments and, with that, nanotechnology can be inserted in this area, as an important tool capable of revolutionizing processes and products, mitigating this problem. Therefore, this work aims to compare the efficiency of sanitizers used by the food industry, such as sodium hypochlorite (HS), alkaline detergent LAT 300 PLUS, nitric acid (AN) and caustic soda (SC) in relation to silver nanostructures (AgNP) , chitosan (NQ) and zinc oxide (ZnOnano), in different concentrations, to control bacterial biofilms, from a simulation of the formation of Listeria monocytogenes and Pseudomonas fluorescens biofilms in stainless steel plates, over 12 days. It was observed a superiority in the growth of L. monocytogenes in relation to P. fluorescens. The nanosanitizers (AgNP, NQ and ZnOnano) were able to reduce the microbial load to a value acceptable by the World Health Organization (3.0 x 102 UFC · mL-1) until the 6th day of analysis, while the AN until the 4th day, and the other commercial sanitizers (HS, LAT, AN and SC) can be considered inefficient in any period of development of the biofilm. Also, in more advanced stages (after 12 days), commercial sanitizers showed a reduction of a maximum of 2.00 log cycles, while nanosanitizers were able to reduce between 3.00 to 7.59 log cycles. This result confirms the superior efficiency of nanostructures in the control of biofilms formed in dairy products.

BANKING MEMBERS:
Presidente - 2255060 - IGOR JOSE BOGGIONE SANTOS
Interno - 2028441 - BOUTROS SARROUH
Externa à Instituição - DELAINE MEIRELES GOUVÊA BOGGIONE
Externo à Instituição - HILARIO CUQUETTO MANTOVANI