• JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
 
  Bookmark and Share
 
 
Master's Dissertation
DOI
https://doi.org/10.11606/D.10.2005.tde-18062008-140110
Document
Author
Full name
Monica Ruz-Peres
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2005
Supervisor
Committee
Melville, Priscilla Anne (President)
Benites, Nilson Roberti
Langoni, Hélio
Title in Portuguese
Avaliação da presença de fungos em amostras de leite cru e estudo da susceptibilidade destes microrganismos às relações temperatura/tempo empregadas nos processos de pasteurização e fervura
Keywords in Portuguese
Fervura
Fungo filamentoso
Leite
Levedura
Pasteurização
Abstract in Portuguese
O presente trabalho foi delineado considerando-se a importância de fungos filamentosos e leveduras, os quais estão associados a diversas patologias no homem e animais. Deve-se considerar ainda que o leite e seus derivados lácteos contaminados com estes microrganismos podem constituir potenciais vias de transmissão de zoonoses a eles relacionados. Foram analisadas amostras de leite cru dos tipos A, B e C colhidas nas próprias propriedades leiteiras, bem como amostras de leite comercializado diretamente ao consumidor, visando-se a comparação da qualidade destes produtos quanto à presença e quantidade de fungos. Procedeu-se ainda à avaliação da susceptibilidade dos fungos isolados das amostras de leite às relações temperatura/tempo empregados nos processos de pasteurização e avaliação da sensibilidade destes isolados à fervura do leite. Foram analisadas 70 amostras de leite, sendo 50 de tanques de refrigeração de propriedades leiteiras, 10 de latões de propriedades de exploração leiteira e 10 de latões de transportadores e distribuidores que armazenam e comercializam leite clandestino, sendo que não houve diferença estatisticamente significante entre as medianas das quantidades de unidades formadoras de colônias de fungos/mL de Leite das diferentes procedências, indicando que o nível de contaminação por fungos nas amostras destas três origens foi similar. Foram isolados, em diferentes percentagens, fungos filamentosos e leveduras de todas as amostras de leite das diferentes procedências: Candida spp. (C. krusei, C. guilliermondii, C. tropicalis, C. kefyr, dentre outras), Geotrichum spp., Rhodotorula spp., Trichosporon spp., Aureobasidium sp., Penicillium spp., Acremonium spp., Chrysosporium sp., Mucor spp., Aspergillus spp. Todos os gêneros e espécies isoladas foram submetidos aos testes de pasteurização rápida e lenta, bem como a fervura. O processo de pasteurização rápida foi o procedimento no qual houve maior resistência (72,18%) por parte dos isolados de leveduras e fungos filamentosos submetidos ao teste na metodologia aplicada, seguido pelo processo de fervura (15,89%) e o de pasteurização lenta (0,99%).
Title in English
Evaluation of the presence of fungi in samples of raw milk and study of the susceptibility of these microorganisms to the temperature/time rates employed in pasteurization and boiling processes
Keywords in English
Boiling
Filamentous fungi
Milk
Pasteurization
Yeast
Abstract in English
The present study was outlined considering the importance of filamentous fungi and yeasts, associated to various pathologies in man and animals. It must be considered that milk and dairy products when contaminated with these microorganisms can represent a potential means of zoonosis transmission related to them. Samples of raw milk types A, B and C, collected in dairy farms, as well as milk sold directly to the consumer, were analysed, aiming the comparison of the quality of these products as to the presence and quantity of fungi. The susceptibility of the isolates to the temperature/time rates employed in pasteurization and boiling was also evaluated. Seventy samples of raw milk were analysed, 50 from bulk tanks, 10 from small tanks of milk from dairy farms, and 10 from transportation tanks and distributors that store and sell clandestine milk. No statistically significant difference was observed between medians of the quantity of colonies forming units of fungi/mL of milk from the different sources, indicating that the level of contamination by fungi was similar when the three sources were compared. Filamentous fungi and yeasts were isolated in different percentages from all the samples from the different sources: Candida spp. (C. krusei, C. guilliermondii, C. tropicalis, C. kefyr, etc.), Geotrichum spp., Rhodotorula spp., Trichosporon spp., Aureobasidium sp., Penicillium spp., Acremonium spp., Chrysosporium sp., Mucor spp., Aspergillus spp. All isolates were submitted to pasteurization and boiling. Quick pasteurization was the procedure in which the highest resistance (72.18%) of the isolates was verified, followed by boiling (15.89%) and slow pasteurization (0.99%).
 
WARNING - Viewing this document is conditioned on your acceptance of the following terms of use:
This document is only for private use for research and teaching activities. Reproduction for commercial use is forbidden. This rights cover the whole data about this document as well as its contents. Any uses or copies of this document in whole or in part must include the author's name.
Monica_Ruz_Peres.pdf (1.16 Mbytes)
Publishing Date
2008-09-23
 
WARNING: Learn what derived works are clicking here.
All rights of the thesis/dissertation are from the authors
CeTI-SC/STI
Digital Library of Theses and Dissertations of USP. Copyright © 2001-2024. All rights reserved.