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1.
Article | IMSEAR | ID: sea-219330

ABSTRACT

Human proteins seem to be processed by Human serum biotinidase, and Human excreted proteins seem to be handled with by Human serum biotinidase and Human Chymotrypsin A. Therefore, we must improve PDMD method by using these new findings. Protein determination is performed by the highly sensitive HPLC-SEC-photometric method at UV 210 nm; i.e., c.a. 200-fold sensitive than Lowry抯 method. Human proteins are found to be not metabolized at membrane inserted portions. Membrane and Hydrophobic proteins of Humans are defined as the precipitable proteins at 100,000 x g for 90 min at 4 C, and have hydrophobicities larger than 0.515.

2.
Ciênc. rural ; 41(8): 1472-1474, Aug. 2011. ilus
Article in English | LILACS | ID: lil-596947

ABSTRACT

The aim of this study was to estimate the concentration of milk true protein (TP) by mid-infrared absorbance method (MIR) in samples from bulk tank of dairy herds, and to determine the correlation between the results of TP of milk determined by Kjeldahl and MIR. Forty nine dairy herds were selected (17 Holstein, 6 Jersey and 26 Girolando) for monthly collections of samples from bulk tanks during the period of one year (284 samples). Fat, lactose, crude protein and total solids were firstly determined by MIR, and then analyzed for total and true protein by Kjeldahl method. The regression equation to estimate TP contents based on MIR crude protein determination was as follows: TP=0.0021+(1.0104xCP), where: TP is the content of true protein, CP is the crude protein content determined by the MIR method, and 0.0155 is the model error term.


O objetivo deste estudo foi estimar o teor de proteína verdadeira (PV) do leite por meio de metodologia de espectroscopia na região do infravermelho médio (IVM), em amostras de tanque de rebanhos leiteiros comerciais, e determinar a correlação entre os resultados de proteína verdadeira do leite determinados pelo método de Kjeldahl e por IVM. Foram selecionados 49 rebanhos leiteiros (17 da raça Holandesa, seis da raça Jersey e 26 da raça Girolando) para coletas mensais de amostras de leite de tanque durante o período de um ano, totalizando 284 amostras analisadas. As amostras de leite foram analisadas inicialmente em relação aos teores de gordura, lactose, proteína bruta e sólidos totais por IVM, sendo em seguida analisadas quanto ao teor de PB e PV pelo método de Kjeldahl. A equação de regressão para estimativa do teor de PV com base nos teores de proteína bruta foi a seguinte: PV=0,0021+(1,0104xPB); em que: PV é o teor de proteína verdadeira estimado; PB é o teor de proteína bruta pelo método IVM e 0,0155 é o erro apresentado pelo modelo.

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