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FTIR spectra of enzymatic modified SPI film with lignosulfonate (LSS) and alkali lignin (AL) (left) and deconvoluted spectra in the amide I and II region (wavenumber 1800–1400 cm–1). Abbreviations: AL: alkali lignin, LSS: lignosulfonate, SPI: soy protein isolate, lignin%: g/100 g.
