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FTIR spectral analysis at a wave number region of (A and C) 1,800–1,000 cm−1 and (B and D) 3,000–2,827 cm−1 by PCA using control and tested cells with AuNP–GA in S. flexneri B.
Abbreviations: FTIR, Fourier transform infrared; PCA, principal component analysis; AuNP, gold nanoparticles; GA, gallic acid; S. flexneri B, Shigella flexneri B; PC1, principal component 1; PC2, principal component 2.
