Sensing Application — Wet-Adhesive On-Skin Sensors Based on Metal–Organic Frameworks for Wireless Monitoring of Metabolites in Sweat

4 measurement groups · 19 results

Reported values remain attached to the sample, method, conditions, extraction quality and source location that produced them.

Chronoamperometry for AA/vitamin C detection

Chronoamperometry

Ni3HHTP2 film working electrode on Au/BNC · Electrode

0.1 M PBS at pH 7, CHI1600C workstation; circulating fluid from two peristaltic pumps; potential 0.001 V vs Ag/AgCl.

Atmosphere: aqueous PBS
Geometry: Ni3HHTP2-based bichannel wearable electrode
Context: Composite sensor based on pristine Ni3HHTP2 cMOF component
Measurement source: 4-5 · Results and Discussions · Figure 2a-b; Table S1

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
AA/vitamin C linear concentration range	10-1190 uM	—	—	Text Range	4 · Results and Discussions · Figure 2a-b
AA/vitamin C linear range upper boundMarked as a best value within this paper	1190 uM	—	—	Text Exact Reported	4 · Results and Discussions · Figure 2a-b
AA/vitamin C linear range lower bound	10 uM	—	—	Text Exact Reported	4 · Results and Discussions · Figure 2a-b
AA chronoamperometry operating potentialMarked as a best value within this paper	ca. 0.001 V	—	—	Text Rounded Reported	4 · Results and Discussions · Table S1
AA calibration correlation coefficientMarked as a best value within this paper	0.9997	—	—	Text Exact Reported	4 · Results and Discussions · Figure 2a-b
AA/vitamin C amperometric sensitivityMarked as a best value within this paper	4.3484 uA mM^-1 cm^-2	—	—	SI Table Exact Reported	S21 · Table S1 · Table S1

AA selectivity, recyclability, and operational stability tests

Ni3HHTP2 film working electrode on Au/BNC · Electrode

Interferents UA, Glu, lactate, K+, Na+; six reuse cycles; continuously stirred stability test at 0.001 V.

Atmosphere: aqueous electrolyte / sweat-relevant media
Geometry: Ni3HHTP2-based sensor electrode
Context: Composite sensor durability and selectivity
Measurement source: 4-5 · Results and Discussions · Figure 2c-d; Figures S14-S16

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
AA sensor operational stability duration	> 4800 s	—	—	Text Rounded Reported	4 · Results and Discussions · Figure S16
AA sensor recyclability	No observable change when reused for at least six cycles	—	—	Text Exact Reported	4 · Results and Discussions · Figure 2d
AA selectivity versus inorganic ions	K+ and Na+ did not affect the test	—	—	Text Qualitative	4 · Results and Discussions · Figure S14
AA selectivity versus metabolites	AA oxidation current did not change significantly when UA, Glu, and lactate were injected	—	—	Text Qualitative	4 · Results and Discussions · Figure 2c
Ni3HHTP2 crystallinity after water/sensing	Crystallinity well maintained after soaking in water and after sensing	—	—	Text Qualitative	4 · Results and Discussions · Figure S15

Differential pulse voltammetry for UA detection

Voltammetry

Ni3HHTP2 film working electrode on Au/BNC · Electrode

0.1 M PBS; DPV range -0.2 to 0.7 V, incremental potential 0.004 V, pulse amplitude 0.05 V; UA concentrations read from Figure 2f inset.

Atmosphere: aqueous PBS
Geometry: Ni3HHTP2-based bichannel sensor electrode
Context: Composite sensor based on pristine Ni3HHTP2 cMOF component
Measurement source: S6 · Electrochemical measurements · Figure 2f; Figure S19

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
UA DPV calibration upper concentration	about 250 uM	—	—	Figure Axis Approximate	5 · Results and Discussions · Figure 2f inset
UA DPV calibration lower concentration	about 50 uM	—	—	Figure Axis Approximate	5 · Results and Discussions · Figure 2f inset
Representative UA DPV oxidation peak potential	about 0.47 V	—	—	Visual Estimate Approximate	5 · Results and Discussions · Figure 2f
UA selectivity against DA, 5-HT, and AA	UA peak readily distinguished from DA, 5-HT, and AA	—	—	Text Qualitative	4-5 · Results and Discussions · Figure 2g; Figure S18

Wireless on-body vitamin C sensing compared with HPLC

Ni3HHTP2 film working electrode on Au/BNC · Electrode

Five male subjects aged 20-30; forehead sweat after treadmill perspiration; Bluetooth smartphone readout; sweat collected simultaneously for Waters Alliance HPLC with C18 column and potassium phosphate monobasic/methanol 88:12 mobile phase at lambda = 243 nm.

Atmosphere: human sweat/on-body
Geometry: Ni3HHTP2 wearable patch connected to PCB through enameled Cu wire and ACF
Context: Composite sensor application demonstration
Measurement source: S7-S8 · On-body sweat analysis · Figure 4; Figure S22

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Average percentage error versus HPLCMarked as a best value within this paper	13.4% in five samples	—	—	Text Exact Reported	7 · Results and Discussions · Figure 4d
On-body sweat vitamin C 4 h after 1000 mg pillMarked as a best value within this paper	26 uM after 4 h	—	—	Text Exact Reported	7 · Results and Discussions · Figure 4f
On-body sweat vitamin C before intake	15 uM before intake	—	—	Text Exact Reported	7 · Results and Discussions · Figure 4f
Example smartphone vitamin C display	8.91 uM	—	—	Visual Estimate Approximate	7 · Results and Discussions · Figure 4c