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. 2021 May 10;10(5):1033. doi: 10.3390/foods10051033

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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MIR spectral overlays for ISO100 with increasing amount of amino acid to a ratio of 1:3. (a) Doping with the amino acid glutamic acid spike in the range of 850–770 cm⁻¹ ( = ISO100, = ISO100:GA (10:1), = ISO100:GA (4:1), = ISO100:GA (1:1), = ISO100:GA (1:3), = GA); (b) doping with the amino acid lysine over the range from 880–820 cm⁻¹ ( = ISO100, = ISO100:Lysine (10:1), = ISO100/Lysine (4:1), = ISO100:Lysine (1:1), = ISO100:Lysine (1:3), = Lysine); and (c) doping with the amino acid glycine over the range from 950–850 cm⁻¹ ( = ISO100, = ISO100:Glycine (10:1), = ISO100:Glycine (4:1), = ISO100/Glycine (1:1), = ISO100/Glycine (1:3), = Glycine).

Inline graphic — MIR spectral overlays for ISO100 with increasing amount of amino acid to a ratio of 1:3. (a) Doping with the amino acid glutamic acid spike in the range of 850–770 cm⁻¹ ( = ISO100, = ISO100:GA (10:1), = ISO100:GA (4:1), = ISO100:GA (1:1), = ISO100:GA (1:3), = GA); (b) doping with the amino acid lysine over the range from 880–820 cm⁻¹ ( = ISO100, = ISO100:Lysine (10:1), = ISO100/Lysine (4:1), = ISO100:Lysine (1:1), = ISO100:Lysine (1:3), = Lysine); and (c) doping with the amino acid glycine over the range from 950–850 cm⁻¹ ( = ISO100, = ISO100:Glycine (10:1), = ISO100:Glycine (4:1), = ISO100/Glycine (1:1), = ISO100/Glycine (1:3), = Glycine).