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Enhanced CL factor for the analyzed milk samples: (a) With and (b) in the absence of 25 nm cross-linked GNPs onto the luminol CL system. Top inset: A schematic illustration of the intensified emitted radiation (eCL concept). The enhancement values were calculated with respect to CL values in the absence of cross-linked GNPs, while omitting milk from the assay. Data are reported as mean ± standard deviation (n ≥ 3). * Significantly different (t-test, p < 0.05).
