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. 2021 Nov 23;16(1):1–13. doi: 10.1049/nbt2.12070

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© 2021 The Authors. IET Nanobiotechnology published by John Wiley & Sons Ltd on behalf of The Institution of Engineering and Technology.

This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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UV–Vis spectra recorded as a function of time of reaction of 1 mM, (a) AgNO₃, (b) HAuCl₄, (c) CuSO₄ and (d) ZnSO₄ with cell‐free filtrate of Aspergillus kambarensis. The results displayed the range of AgNPs (417 nm), AuNPs (542 nm), CuNPs (582 nm) and ZnONPs (367 nm)