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. 2018 Jan 22;3(1):724–733. doi: 10.1021/acsomega.7b00982

Figure 1.

Figure 1

A: Representative UV–vis spectra of AgNO3 in the presence of starch, with one of the following reducing sugars: Glc (black), NAG (red), GlcA (blue), and no sugar (pink). Samples were taken after 2 h of reaction. The peaks at 412 and 424 nm are characteristic of nanosilver surface plasmon resonance effect.59 AgNP concentration contributes to the absorbance intensity, whereas NPs’ core sizes refer to both the absorbance intensity and the nanoparticle size.59 Thus, Glc resulted in a higher rate of nanoparticle formation than NAG, whereas GlcA and no reducing sugar lead to no nanoparticle formation. B: TEM image of AgNP embedded in the field EPS matrix. The nanosilver atoms are distinguishable; however, the organic matrix atoms are nonidentifiable. This image is representative for AgNPs imbedded in EPS matrix and starch.