Extraction and characterization of protein from okara

Q: What does this research mean for the field?

Ultrasound-assisted alkaline extraction at pH 12 and 75% amplitude maximizes protein yield from okara to 17.67% while maintaining peptide backbone structure and functional properties comparable to conventional soy proteins. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

Kyeong-Jin Lee; Woo-Ju Kim

doi:10.9721/kjfst.2026.58.4.493

August 31, 2026Korean Journal of Food Science and TechnologyOpen Access

Extraction and characterization of protein from okara

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Key Points

To evaluate the yield, purity, and functional characteristics of proteins recovered from soybean curd residue (okara) using ultrasound-assisted alkaline extraction under varied processing conditions.
Extracted protein from okara using alkaline extraction alone across varying pH and temperature conditions, as well as combined with ultrasound assistance at different amplitudes.
Evaluated the functional properties of recovered fractions, including water absorption, oil absorption, solubility, foaming capacity, and structural integrity via FT-IR spectroscopy.
Ultrasound-assisted extraction achieved a maximum protein recovery yield of approximately 17.67% at pH 12 and 75% amplitude, with yield significantly increasing at higher pH and amplitude levels.
Extracted protein content remained stable between 62% and 68% across conditions, indicating that ultrasound enhanced recovery yield without altering protein purity.
Recovered protein exhibited a water absorption capacity of 4.33 ± 0.54 g/g, an oil absorption capacity of 2.31 ± 0.22 g/g, and preserved amide I, II, and III bands on FT-IR analysis.

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Implication

Experimental study demonstrates enhanced protein recovery from okara via ultrasound-assisted alkaline extraction, indicating its viable potential as a functional food ingredient.

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Lee et al. (2026) studied this question.

synapsesocial.com/papers/6a99351f636c6408cfa7d001 https://doi.org/10.9721/kjfst.2026.58.4.493

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Extraction and characterization of protein from okara

Key Points

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Implication

Abstract

Discussion

Cite This Study

Extraction and characterization of protein from okara

Key Points

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Implication

Abstract

Discussion

Cite This Study

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