The comparison of amino acid composition of the protein in preparations obtained from potato tubers cultivated within ecological and conventional systems
Anna Pęksa
anna.peksa@upwr.edu.plKatedra Technologii Rolnej i Przechowalnictwa, Uniwersytet Przyrodniczy we Wrocławiu (Poland)
Elżbieta Rytel
Katedra Technologii Rolnej i Przechowalnictwa, Uniwersytet Przyrodniczy we Wrocławiu (Poland)
Agnieszka Tajner-Czopek
Katedra Technologii Rolnej i Przechowalnictwa, Uniwersytet Przyrodniczy we Wrocławiu (Poland)
Agnieszka Kita
Katedra Technologii Rolnej i Przechowalnictwa, Uniwersytet Przyrodniczy we Wrocławiu (Poland)
Maria Pytlarz-Kozicka
Katedra Szczegółowej Uprawy Roślin, Uniwersytet Przyrodniczy we Wrocławiu (Poland)
Joanna Miedzianka
Katedra Technologii Rolnej i Przechowalnictwa, Uniwersytet Przyrodniczy we Wrocławiu (Poland)
Abstract
The aim of the experiment was to study the influence of thermal coagulation of protein in potato juice isolated from tubers of three potato varieties cultivated conventionally and in ecological system on amino acid composition and nutritive value of obtained preparations. A soil fertilizer and copper salt 50 WP as a fungicide were used within ecological system of potato cultivation and in conventional system fertilizing with high doses of NPK, herbicides, insecticides and fungicides were applied. Protein coagulation was performed in juice containing dissolved CaCl2. After suitable hydrolysis of the obtained concentrates, the chemical composition and contents of 18 amino acids were determined in total protein with the use of automatic amino acid analyser. Potato protein concentrates (PPC) obtained from tubers cultivated within ecological system contained more nitrogen compounds and also forms of protein nitrogen than there were found in preparations originating from juice of tubers cultivated conventionally. Also, in amino acid composition of isolated protein we found more such essential amino acids as Leucine, Phenylalanine, Tyrosine and Threonine. Among remaining amino acids in PPC originating from potatoes cultivated within ecological system there was more of Asparagine acid, Serine and Glycine. Chemical Score (CS) expressing nutritive value of studied concentrates, in dependence of protein standard chosen for comparison occurred similar or higher than it was established for standard, particularly in the case of preparations obtained from tubers cultivated within ecological system.
Keywords:
concentrates, cultivation system, nutritive value, potato proteinReferences
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Authors
Anna Pęksaanna.peksa@upwr.edu.pl
Katedra Technologii Rolnej i Przechowalnictwa, Uniwersytet Przyrodniczy we Wrocławiu Poland
Authors
Elżbieta RytelKatedra Technologii Rolnej i Przechowalnictwa, Uniwersytet Przyrodniczy we Wrocławiu Poland
Authors
Agnieszka Tajner-CzopekKatedra Technologii Rolnej i Przechowalnictwa, Uniwersytet Przyrodniczy we Wrocławiu Poland
Authors
Agnieszka KitaKatedra Technologii Rolnej i Przechowalnictwa, Uniwersytet Przyrodniczy we Wrocławiu Poland
Authors
Maria Pytlarz-KozickaKatedra Szczegółowej Uprawy Roślin, Uniwersytet Przyrodniczy we Wrocławiu Poland
Authors
Joanna MiedziankaKatedra Technologii Rolnej i Przechowalnictwa, Uniwersytet Przyrodniczy we Wrocławiu Poland
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