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. 2020 Oct 28;9(11):1052. doi: 10.3390/antiox9111052

Figure 3.

Figure 3

(a) Measuring scheme. (b) Photo illustrating the monitoring process of skin antioxidant activity (AOA) using a sensory system. E1–E3: electrodes; M: membrane; PA-S 1 and PA-S 2: potentiometric analyzers; P: load. (c) Measurement of the enhancing effect of consumption of food enriched with vitamins on the skin AOA of 6 volunteers (The age of the respondents is indicated between parentheses). Reprinted from Ref. [22] with permission from MDPI. (d) Cyclic voltammograms of hydroquinone on different modified electrodes; blank with an unmodified SPCE (a), GNPl/SPCE (b), AuNP/GNPl/SPCE (c), LACC/GNPl/SPCE (d), LACC/AuNP/GNPl/SPCE (e). Reprinted with permission from Ref. [49]. Copyright (2019) Elsevier. (e) Stable droplet formation obtained using six nozzles simultaneously, (f) Schematic illustration of inkjet-printed PA/CNT electrodes based on successive printing of Ag, CNT, insulator, and PA, (g) Schematic representation of simultaneous IJP and UV photopolymerization. Reprinted with permission from Ref. [18]. Copyright (2015) American Chemical Society.