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Synthesis of low-phenylalanine polypeptides
International Journal of Peptide and Protein Research
|September 1, 1982
Summary
Researchers developed low-phenylalanine peptides from soy protein for phenylketonuria (PKU) diet therapy. Enzymatic hydrolysis significantly reduced phenylalanine content, offering a promising dietary approach for PKU management.
Area of Science:
- Biochemistry
- Food Science
- Nutritional Science
Background:
- Phenylketonuria (PKU) requires strict low-phenylalanine diet.
- Soybean protein isolate is a potential source for hypoallergenic protein hydrolysates.
Purpose of the Study:
- To prepare low-phenylalanine peptides from soybean protein isolate for PKU dietotherapy.
- To characterize the phenylalanine content and molecular weight distribution of the resulting peptides.
Main Methods:
- Soybean protein isolate was solubilized and hydrolyzed using alpha-chymotrypsin.
- Further hydrolysis was performed using carboxypeptidase-A.
- Molecular weight distribution and amino acid analysis were conducted on the hydrolysates.
Main Results:
- Chymotrypsin hydrolysate was fractionated into Fraction I (>2500 Da) and Fraction II (1000-2500 Da).
- Fraction I had lower phenylalanine (3.1%) than Fraction II (5%), indicating non-uniform distribution.
- Carboxypeptidase-A hydrolysis of Fraction I reduced phenylalanine to 2.3%.
Conclusions:
- Enzymatic hydrolysis of soybean protein isolate can produce peptides with significantly reduced phenylalanine content.
- These low-phenylalanine peptides are suitable for developing specialized food products for PKU diet therapy.
- The study demonstrates a viable method for creating a more effective and potentially palatable PKU dietary management option.