[Biological value of the unicellular protein of Kluyveromyces marxianus var. lactis].
The ever increasing problem of environmental pollution and protein scarcity led us to begin producing protein biomass from cheese whey, having selected for this aim, Kluyveromyces marxianus va. lactis strain, which represents the right relationship between its protein content (53.3% d.w.) and that of the RNA (4.63% d.w.). On the other hand, the distribution of its essential amino acids is balanced, although it shows a deficiency in methionine, its value being 1.5 g/16 gN. The purpose of this work was to assess the biological quality of this protein concentrate, so as to use it in animal feeding. Protein quality was determined by the NPU method (net protein utilization), according to Miller and Bender's technique. Three balanced diets were prepared (10% protein), the test sample with casein, and the rest with protein biomass, one of then supplemented with methionine (0.5 g/100 g food). Based on the results it can be concluded that the biomass analyzed has an adequate biological value (55.37%) for use in animal feeding, especially when methionine as added (60.23%).
Carrasco de Mendoza
M S
MS
Facultad de ingeniería Química, Universidad Nacional del Litoral, Santa Fe, Argentina.
Basílico
J C
JC
Umansky
G
G
Scarinci
H E
HE
D000601:Amino Acids, Essential / Q000032:analysis*; D000821:Animal Feed; D000818:Animals; D004032:Diet; D005285:Fermentation; D005656:Fungal Proteins / Q000032:analysis*; D006801:Humans; D007716:Kluyveromyces / Q000737:chemistry*; D008297:Male; D009753:Nutritive Value; D051381:Rats; D011919:Rats, Inbred Strains
D000601:Amino Acids, Essential; D005656:Fungal Proteins
Estudio del valor biológico de la proteína unicelular de. Kluyveromyces marxianus var. lactis.