Assessment of whey protein nitrogen index as an indicator of heat treatment for UHT milk and milk powder
<p>During heat treatment of dairy products it is possible to occur several chemical modifications which whey protein denaturation is quite evident and studied. This phenomenon can cause gelation in UHT milk and some problems in reconstitution of milk powder, two major dairy products widely use...
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doaj-fc4f0525e3f54e63af2ab694b32f6e8c2020-11-24T22:39:19ZengEmpresa de Pesquisa Agropecuária de Minas Gerais (EPAMIG)Revista do Instituto de Latícinios Cândido Tostes0100-36742238-64162015-09-01702788410.14295/2238-6416.v70i2.389318Assessment of whey protein nitrogen index as an indicator of heat treatment for UHT milk and milk powderLeandra Natália Oliveira0Vanessa Toledo Marinho1Marilana Vidal Zamagno2Maraíse Aparecida Lauro3Jéssica Aparecida Norvino Barboza4Paulo Henrique Fonseca da Silva5Departamento de Nutrição / UFJF- Juiz de Fora- MG- BrasilDepartamento de Nutrição / UFJF- Juiz de Fora- MG- BrasilDepartamento de Nutrição / UFJF- Juiz de Fora- MG- BrasilDepartamento de Nutrição / UFJF- Juiz de Fora- MG- BrasilDepartamento de Nutrição / UFJF- Juiz de Fora- MG- BrasilDepartamento de Nutrição / UFJF- Juiz de Fora- MG- Brasil<p>During heat treatment of dairy products it is possible to occur several chemical modifications which whey protein denaturation is quite evident and studied. This phenomenon can cause gelation in UHT milk and some problems in reconstitution of milk powder, two major dairy products widely used in dairy foods and by consumer. The whey protein nitrogen index (WPNI) can be an useful tool to assess the degree of severity that milk was submitted, and therefore inferred from the occurrence of possible defects associated with protein denaturation. This study presents the<br />evaluation of the non-denaturated whey protein contents as a heat treatment indicator for ultrapasteurization and drying milk processing. Commercial samples of UHT milk and milk powdershowed WPNI confidence interval of (2.39 ± 1.41) mgWPN.mL-1 and (2.63 ± 1.38) mgWPN.mL-1, respectively. According to the statistical analysis of variance, all samples differed with a p-value < 0.001; and 90% of UHT milk and 67% milk powder samples were classified as medium heat treatment. It was possible to infer the severity of the heat treatment associated with each kind of product analyzed.<br />The results were able to demonstrate the lack of standardization of heat treatment processes on the samples studied, a fact that may result in the growth of undesirable<br />characteristics in the products during the storage or commercia lization.</p>http://www.revistadoilct.com.br/rilct/article/view/389Desnaturaçãoprocessamento térmicoqualidadedesidratação. |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Leandra Natália Oliveira Vanessa Toledo Marinho Marilana Vidal Zamagno Maraíse Aparecida Lauro Jéssica Aparecida Norvino Barboza Paulo Henrique Fonseca da Silva |
spellingShingle |
Leandra Natália Oliveira Vanessa Toledo Marinho Marilana Vidal Zamagno Maraíse Aparecida Lauro Jéssica Aparecida Norvino Barboza Paulo Henrique Fonseca da Silva Assessment of whey protein nitrogen index as an indicator of heat treatment for UHT milk and milk powder Revista do Instituto de Latícinios Cândido Tostes Desnaturação processamento térmico qualidade desidratação. |
author_facet |
Leandra Natália Oliveira Vanessa Toledo Marinho Marilana Vidal Zamagno Maraíse Aparecida Lauro Jéssica Aparecida Norvino Barboza Paulo Henrique Fonseca da Silva |
author_sort |
Leandra Natália Oliveira |
title |
Assessment of whey protein nitrogen index as an indicator of heat treatment for UHT milk and milk powder |
title_short |
Assessment of whey protein nitrogen index as an indicator of heat treatment for UHT milk and milk powder |
title_full |
Assessment of whey protein nitrogen index as an indicator of heat treatment for UHT milk and milk powder |
title_fullStr |
Assessment of whey protein nitrogen index as an indicator of heat treatment for UHT milk and milk powder |
title_full_unstemmed |
Assessment of whey protein nitrogen index as an indicator of heat treatment for UHT milk and milk powder |
title_sort |
assessment of whey protein nitrogen index as an indicator of heat treatment for uht milk and milk powder |
publisher |
Empresa de Pesquisa Agropecuária de Minas Gerais (EPAMIG) |
series |
Revista do Instituto de Latícinios Cândido Tostes |
issn |
0100-3674 2238-6416 |
publishDate |
2015-09-01 |
description |
<p>During heat treatment of dairy products it is possible to occur several chemical modifications which whey protein denaturation is quite evident and studied. This phenomenon can cause gelation in UHT milk and some problems in reconstitution of milk powder, two major dairy products widely used in dairy foods and by consumer. The whey protein nitrogen index (WPNI) can be an useful tool to assess the degree of severity that milk was submitted, and therefore inferred from the occurrence of possible defects associated with protein denaturation. This study presents the<br />evaluation of the non-denaturated whey protein contents as a heat treatment indicator for ultrapasteurization and drying milk processing. Commercial samples of UHT milk and milk powdershowed WPNI confidence interval of (2.39 ± 1.41) mgWPN.mL-1 and (2.63 ± 1.38) mgWPN.mL-1, respectively. According to the statistical analysis of variance, all samples differed with a p-value < 0.001; and 90% of UHT milk and 67% milk powder samples were classified as medium heat treatment. It was possible to infer the severity of the heat treatment associated with each kind of product analyzed.<br />The results were able to demonstrate the lack of standardization of heat treatment processes on the samples studied, a fact that may result in the growth of undesirable<br />characteristics in the products during the storage or commercia lization.</p> |
topic |
Desnaturação processamento térmico qualidade desidratação. |
url |
http://www.revistadoilct.com.br/rilct/article/view/389 |
work_keys_str_mv |
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