Nutritional assessment of two vegetable protein concentrates in growing rats

Nestares, T.; Lopez-Jurado, M.; Sanz, A.; Lopez-Frias, M.

Nutritional assessment of two vegetable protein concentrates in growing rats

1993

Nestares, T. | Lopez-Jurado, M. | Sanz, A. | Lopez-Frias, M.

The digestive and metabolic utilizations of vegetable protein concentrates were determined in growing rats with the nutritional balance method of Thomas-Mitchell. The test diets contained 12 % protein in the form of casein plus 5% DL-methionine (control), commercial potato (PPC) and wheat (WPC) concentrates, and supplemented wheat protein concentrate (SMTC). The chemical composition of the protein sources was also determined to detect possible deficiencies in essential amino acids in PPC and WPC. The aminogram for PPC showed the content in amino acids to be adequate for the requirements of growing rats. The WPC presented a low content in tyrosine and some essential amino acids (methionine, tryptophan, and cysteine). The PPC had excellent nutritional value, as was indicated by the indices protein efficiency ratio (PER), apparent (ADC) and true digestibility coefficients (TDC) for protein, biological value (BV), net protein utilization (NPU), and nitrogen retention (nitrogen balance), which reflect the nutritive use of protein. However, the digestive and metabolic utilizations of WPC were poor and did not improve significantly after supplementation with amino acids. This poor response may have been due to the industrial production process which could have affected the bioavailability of some essential amino acids.

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