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UV-vis spectra of biosynthesized Bauhinia tomentosa Linn flower-powder extract-derived AgNPs 0 h (left) and 4 h (right) of incubation of B. tomentosa Linn flower powder extract with AgNO3. Over a period of 4 h the absorption peak shifted from approximately 400 nm to 420 nm due to the reduction of Ag+ to Ag0, indicating that AgNPs were obtained.
