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. 2021 Nov 18;13(11):1958. doi: 10.3390/pharmaceutics13111958

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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UV-vis spectra of oxygenated (oxy-Hb) and deoxygenated (deoxy-Hb) HbNPs obtained after successively purging with compressed air and nitrogen (N₂) gas. The HbNPs (HbNPs-6_TRE3) were prepared using a 100 mg mL⁻¹ Hb concentration, trehalose (TRE) at a Hb:TRE ratio of 10:1, 12.5 mg mL⁻¹ PLGA and 1% PVA.