STUDY OF MICROBIOLOGICAL CHARACTERISTCS OF UHT MILK ALONG ITS PROCESSING

Rossi Júnior, O.D.; Vidal-Martins, A.M.C.; Salotti, B.M.; Bürger, K.P.; Cardozo, M.V.; Cortez, A.L.L.

doi:10.1590/1808-1657v73p0272006

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Artigo Científico • Arq. Inst. Biol. 73 (1) • Jan-Mar 2006 • https://doi.org/10.1590/1808-1657v73p0272006 copy

STUDY OF MICROBIOLOGICAL CHARACTERISTCS OF UHT MILK ALONG ITS PROCESSING

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

With the aim of studying microbiological characteristics of UHT milk (ultra high temperature) during the industrialization, the present study analysed 60 samples of raw milk, 60 of pasteurized and 30 of UHT process, collected ata a factory. It was seen that the population of mesophilic, psychrotrophic and sporulated microrganisms decreased with thermal threatment, because the number of microrganisms were 10⁸, 10⁷ and 10⁴ CFU/mL in raw milk, and decreased to 10⁴, 10² and 10⁵ CFU/mL in pasteurized to less tham 1.0, 10.0 and 1.0 CFU/mL in UHT milk. The same was verified with the mesophilic population of thermophils, which, in the pasteurized milk were 10³ CFU/mL and UHT 1.0 CFU/mL. The results allow for the conclusion that termal threatment applied to raw material in the production of UHT milk were able to reduce but not to eliminate the initial number of microrganisms.

KEY WORDS
Raw milk; pasteurized milk; UHT milk; mesophilic; psichrotrophic; spores

Colheita	Tipo de leite	Populações de microrganismos
		Mesófilos UFC / mL			TermófilosUFC / mL			PsicrotróficosUFC / mL			Esporos mesófilos UFC / mL
		Mínimo	Mediana	Máximo	Mínimo	Mediana	Máximo	Mínimo	Mediana	Máximo	Mínimo	Mediana	Máximo
A	Cru	1,7 x 10⁸	2,1 x 10⁸	2,3 x 10⁸	-	-	-	2,3 x 10⁸	4,0 x 10⁸	2,6 x 10⁹	2,1 x 10⁴	3,3 x 10⁴	4,5 x 10⁴
	Past.	1,2 x 10⁵	2,5 x 10⁵	4,0 x 10⁵	6,0 x 10²	1,6 x 10³	2,0 x 10³	< 1,0 x 10	< 1,0 x 10	1,0 x 10²	< 1,0 x 10⁰	< 1,0 x 10⁰	< 1,0 x 10⁰
	UAT	< 1,0 x 10⁰	< 1,0 x 10⁰	1,0 x 10⁰	< 1,0 x 10⁰	< 1,0 x 10⁰	1,0 x 10⁰	< 1,0 x 10	5,0 x 10¹	1,0 x 10³	< 1,0 x 10⁰	< 1,0 x 10⁰	1,0 x 10⁰
B	Cru	2,6 x 10⁷	1,6 x 10⁸	2,4 x 10⁸	-	-	-	1,0 x 10⁷	2,0 x 10⁷	1,7 x 10⁸	1,6 x 10⁴	2,0 x 10⁴	3,4 x 10⁴
	Past.	2,0 x 10²	4,3 x 10⁴	9,3 x 10⁴	< 1,0 x 10⁰	2,0 x 10²	4,0 x 10²	< 1,0 x 10	< 1,0 x 10	< 1,0 x 10	2,2 x 10³	2,8 x 10³	3,7 x 10³
	UAT	< 1,0 x 10⁰	1,0 x 10⁰	1,0 x 10¹	< 1,0 x 10⁰	< 1,0 x 10⁰	< 1,0 x 10⁰	< 1,0 x 10	< 1,0 x 10	< 1,0 x 10	< 1,0 x 10⁰	< 1,0 x 10⁰	2,0 x 10⁰
C	Cru	4,0 x 10⁷	1,8 x 10⁸	3,3 x 10⁸	-	-	-	1,4 x 10⁷	4,5 x 10⁷	9,8 x 10⁷	1,2 x 10⁴	2,2 x 10⁵	4,0 x 10⁵
	Past.	1,5 x 10⁴	1,9 x 10⁴	2,4 x 10⁴	1,0 X 10²	3,0 x 10²	8,9 x 10²	3,0 x 10¹	1,0 x 10²	1,6 x 10²	3,5 x 10³	3,8 x 10³	5,1 x 10³
	UAT	< 1,0 x 10⁰	< 1,0 x 10⁰	< 1,0 x 10⁰	< 1,0 x 10⁰	< 1,0 x 10⁰	< 1,0 x 10⁰	< 1,0 x 10	< 1,0 x 10	< 1,0 x 10	< 1,0 x 10⁰	< 1,0 x 10⁰	< 1,0 x 10⁰
D	Cru	1,5 x 10⁷	2,1 x 10⁷	1,5 x 10⁸	-	-	-	1,6 x 10⁵	1,8 x 10⁵	2,2 x 10⁵	< 1,0 x 10⁰	7,0 x 10²	7,0 x 10³
	Past.	4,4 x 10³	1,2 x 10⁴	3,0 x 10⁴	1,3 x 10³	6,7 x 10³	7,1 x 10³	4,0 x 10²	5,5 x 10²	1,5 x 10³	4,0 x 10¹	8,0 x 10¹	1,4 x 10²
	UAT	< 1,0 x 10⁰	3,0 x 10¹	8,0 x 10¹	< 1,0 x 10⁰	< 1,0 x 10⁰	3,0 x 10¹	1,2 x 10²	4,0 x 10²	8,8 x 10²	< 1,0 x 10⁰	< 1,0 x 10⁰	1,0 x 10⁰
E	Cru	1,9 x 10⁸	2,2 x 10⁸	3,1 x 10⁸	-	-	-	2,1 x 10⁷	2,3 x 10⁷	7,9 x 10⁷	2,0 x 10²	1,6 x 10³	2,6 x 10³
	Past.	1,6 x 10³	1,8 x 10³	2,4 x 10³	1,4 x 10³	2,9 x 10³	3,3 x 10³	2,3 x 10²	6,4 x 10²	7,6 x 10²	1,4 x 10²	7,9 x 10²	1,7 x 10³
	UAT	< 1,0 x 10⁰	< 1,0 x 10⁰	< 1,0 x 10⁰	< 1,0 x 10⁰	< 1,0 x 10⁰	< 1,0 x 10⁰	< 1,0 x 10	< 1,0 x 10	< 1,0 x 10	< 1,0 x 10⁰	< 1,0 x 10⁰	1,5 x 10²
F	Cru	1,7 x 10⁷	2,2 x 10⁷	2,3 x 10⁸	-	-	-	1,0 x 10³	1,0 x 10⁴	2,0 x 10⁵	1,3 x 10³	5,0 x 10³	1,1 x 10⁴
	Past.	1,5 x 10⁴	1,6 x 10⁴	1,9 x 10⁴	1,6 x 10³	1,9 x 10³	2,1 x 10³	3,1 x 10¹	6,8 x 10²	1,3 x 10²	7,2 x 10²	8,3 x 10³	1,4 x 10⁴
	UAT	< 1,0 x 10⁰	< 1,0 x 10⁰	1,0 x 10⁰	< 1,0 x 10⁰	< 1,0 x 10⁰	< 1,0 x 10⁰	< 1,0 x 10	< 1,0 x 10	< 1,0 x 10	1,0 x 10⁰	1,0 x 10⁰	1,0 x 10⁰

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Bolsista de Iniciação Científica, CNPq.