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(A) Porcine tissue used to conceal a quartz vial containing MBA labeled 100 nm diameter gold nanoparticles. (B) Pure transmission Raman spectra of porcine tissue at set time intervals. (C) Pure transmission Raman spectra of the MBA-NP solution. (D) Transmission Raman spectra of the pH position sensitive benzene ring stretching mode of MBA at ∼1585 cm–1.
