Emerging technologies for next-generation point-of-care testing
Sandeep Kumar Vashist a*, Peter B. Luppa a, Leslie Y. Yeo b, Aydogan Ozcan c,d,e and John H.T. Luong f*
a Institute of Clinical Chemistry and Pathobiochemistry, Klinikum rechts der Isar der Technischen Universität München, Ismaninger Str. 22, D-81675 Munich, Germany.
b Micro/Nanophysics Research Laboratory, RMIT University, Melbourne, VIC 3001, Australia.
c Electrical Engineering Department, University of California, Los Angeles, CA 90095, USA.
d Bioengineering Department, University of California, Los Angeles, CA 90095, USA.
e California NanoSystems Institute (CNSI), University of California, Los Angeles, CA 90095, USA.
f Innovative Chromatography Group, Irish Separation Science Cluster (ISSC), Department of Chemistry and Analytical, Biological Chemistry Research Facility (ABCRF), University College Cork, Cork, Ireland.
*Corresponding authors. (SKV) E-mail: sandeep.vashist@tum.de; Tel.: +49 89 41404071; Fax: +49 89 41404875. (JHTL) E-mail: j.luong@ucc.ie
Supplementary Table S1. Cell phone-based point-of-care testing (CP-POCT).
Types
|
Analyte(s) detected
|
Characteristics
|
Ref.
|
Colorimetric detection
|
Peanut
|
Detects 1-25 ppm of peanut within 20 min
|
[1]
|
|
25-hydroxyvitamin D
|
AuNP-based immunoassay (IA), linear detection range (LDR): 15-110 nM
|
[2]
|
|
Herpesvirus nucleic acid
|
DNA sequences [1 mM] from Kaposi’s sarcoma associated herpes virus (KSHV) using a nanoparticle (NP) assay in microfluidic chips
|
[3]
|
|
CRP
|
CRP [0.035-0.182 µg mL-1] with limit of detection (LOD) of 0.026 µg mL-1
|
[4]
|
|
CRP
|
Rapid sandwich IA for CRP [0.3-81 ng mL-1] with LOD of 0.4 ng mL-1 using a smartphone-based colorimetric reader
|
[5]
|
|
Cortisol
|
Detects cortisol in 10 min with LDR of 0.01-10 ng mL-1 and LOD of 0.01 ng mL-1
|
[6]
|
|
Cholesterol
|
Detects the total cholesterol level in blood [140-400 mg dL-1] within 1 min
|
[7]
|
|
Proteases
|
A quantum dot (QD) based multiplex assay for the activity of trypsin, chymotrypsin and enterokinase [pM-nM]
|
[8]
|
|
Cocaine
|
AuNP and aptamer-based assay for cocaine with LDR of 0.2-0.8 mg mL-1
|
[9]
|
|
HE4
|
Microchip ELISA for HE4 in urine with LDR of 19.5-1250 ng mL-1 and LOD of 19.5 ng mL-1
|
[10]
|
|
Hg2+
|
Plasmonic AuNP and aptamer-based assay for Hg2+ with LOD of ~3.5 ppb
|
[11]
|
|
Albumin
|
Detects albumin in the LDR of 0-100 mg dL-1 with LOD of 6 mg dL-1
|
[12]
|
|
Glucose
|
Detects glucose in the LDR of 0-300 mg dL-1 with LOD of 40 mg dL-1
|
[12]
|
|
Triplex detection of infectious diseases
|
Detects HIV antibody, treponemal specific antibody for syphilis, and non-treponemal antibody for active syphilis infection in 15 min
|
[13]
|
|
Mumps, measles and herpes simplex virus IgGs
|
CP-based hand-held micro-plate reader based ELISAs for mumps, measles and herpes simplex virus IgGs
|
[14]
|
|
Multi-analyte sensing arrays
|
An image processing algorithm for ascorbic acid, glucose, protein, ketones, urobilinogen, bilirubin and RBC using paper-based urine strips
|
[15]
|
|
Heavy metals (Cu2+, Ni2+, Cd2+ and Cr6+)
|
Detects Cu2+, Ni2+, Cd2+ and Cr6+ with LODs of 0.29, 0.33, 0.19 and 0.35 ppm, respectively
|
[16]
|
|
2,2ʹ,4,4ʹ-tetrabromodiphenyl ether (BDE-47)
|
Detects BDE-47 in the LDR of 10-3-104 ng mL-1 using CP-interfaced lab-on-a-chip device based ELISA
|
[17]
|
Fluorescent detection
|
M. tuberculosis
|
M. tuberculosis bacilli in Auramine O-stained sputum smears.
|
[18]
|
|
Salmonella typhimurium DNA
|
A fluorescent microscope and paper microfluidics-based assay for detecting S. typhimurium down to 104 CFU mL-1
|
[19]
|
|
DNA amplification
|
Detects the DNA fragment of the Hepatitis B virus plasmid by convective polymerase chain reaction (cPCR)
|
[20]
|
|
Recombinant bovine somatotropin (rbST) Abs
|
Detects rbST Abs in milk extracts by an IA using magnetic polystyrene microspheres and QD-labelled detection Ab
|
[21]
|
|
Salmonella and E.coli O157
|
Lateral flow IA (LFIA) strips for Salmonella and E. coli O157 with LOD of 105 CFU mL-1
|
[22]
|
|
β-D-galactosidase
|
A paper microfluidics-based IA for β-D-galactosidase, with LDR of 0.7-12 nM and LOD of 0.7 nM
|
[23]
|
|
Single NPs & viruses
|
Fluorescent imaging of isolated 100 nM fluorescent NPs and human cytomegaloviruses
|
[24]
|
|
microRNA
|
Fluorescent molecular beacon assay to detect microRNA with LOD of 10 pM.
|
[25]
|
|
Red blood cells (RBCs)
White blood cells (WBCs)
Haemoglobin (Hb)
|
Imaging cytometry platform for Hb concentration and the density of RBCs and WBCs
|
[26]
|
|
E. coli
|
Detects E.coli O157 by QD-based sandwich IA in glass capillaries with LOD of ~5-10 CFU mL-1
|
[27]
|
|
WBCs
Giardia lamblia cysts
|
Imaging labelled WBCs in whole blood and water-borne pathogenic Giardia lamblia cysts [resolution of 10 µm and FOV of 81 mm2]
|
[28]
|
|
Trypanosoma cruzi
|
T. cruzi genomic DNA [0.1 to100 fg µL-1] with LOD of 9.6 ag
|
[29]
|
|
Collagenase and Trypsin
|
Detects collagenase and trypsin with LODs of 3.75 µg mL-1 and 930 pg, respectively, using a simple CP and tablet-based fluorescence detection system
|
[30]
|
Luminescent detection
|
Bile acid
|
An lateral flow assay (LFA) minicartridge format for total bile acid in serum and oral fluid with LDR and LOD of 0.5-100 µM and 0.5 µM
|
[31]
|
|
Cholesterol
|
LFA minicartridge format for total cholesterol in serum with LDR and LOD of 20-386 mg dL-1 and 20 mg dL-1
|
[31]
|
|
Salivary cortisol
|
LFIA for salivary cortisol [0.3-60 ng mL-1] with LOD of 0.3 ng mL-1
|
[32]
|
Spectrophotometric detection
|
microRNA
|
CP fluorimeter system to detect specific microRNA sequence with LOD of 10 pM using molecular beacon FRET assay
|
[33]
|
|
Additives in beverages and food
|
CP-based spectroscopic analysis using CP’s screen for illumination and front camera for imaging.
|
[34]
|
SPR detection
|
β2 microglobulin (β2M)
|
Angle-resolved SPR detection system for β2M with LOD of 0.1 µg mL-1
|
[35]
|
|
Glycerol
|
Fiber optic SPR sensor to detect glycerol concentrations of 0-20%
|
[36]
|
|
IgG
|
Fiber optic SPR sensor to detect various concentrations of IgG binding to protein A-bound sensing element
|
[37]
|
Electrochemical detection
|
Plasmodium falciparum histidine-rich protein 2 (PfHRP2) biomarker for malaria,
|
Detects PfHRP2 in 15 min with LOD of 16 ng mL-1 using a compact embedded circuit, disposable microfluidic chip and capillary flow
|
[38]
|
|
blood glucose and trace heavy metals (Pb2+, Cd2+, Zn2+) in water, Na+ in urine, and PfHRP2
|
Universal low-cost CP-based electrochemical detector for the detection of blood glucose and heavy metals in water, Na+ in urine, and PfHRP2 biomarker
|
[39]
|
|
2,4,6-trinitrotoluene (TNT)
|
A CP-based electrochemical biosensor, using screen-printed electrodes modified with TNT-specific peptides, to detect TNT with LOD of 1 µM
|
[40]
|
|
iHealth Wireless Smart Gluco-Monitoring System
|
Detects pathophysiological blood glucose concentrations using a miniaturized glucometer interfaced with SP via a smart application
|
[41]
|
|
iHealth Align
|
Detects pathophysiological blood glucose concentrations using the smallest Food and Drug Administration (FDA) approved blood glucose meter
|
[42]
|
|
Escherichia coli
|
CP-based electrochemical biosensor pre-concentrates E.coli and detects it with a LDR and LOD of 10-100 cells mL-1 and 10 cells mL-1, respectively
|
[43]
|
|
Nitrate
|
Audio jack-based electrochemical sensor that detects nitrate concentration in water with LOD of 0.2 ppm and LDR of 1.4-70 ppm within 1 min
|
[44]
|
Cytometry
|
Optofluidic fluorescent imaging-based flow cytometer
|
Compact, light-weight and cost-effective CP-based flow cytometer with fluorescent resolution of ~2 µm and capability to analyze samples >0.1 mL
|
[45]
|
|
RBCs, WBCs and Hb
|
Determines the density of RBCs, WBCs and Hb in blood from a 10 µL sample
|
[26]
|
Other detection techniques
|
Microscopy and spectroscopy
|
Stained and unstained blood smears, and transmission and fluorescence spectroscopy of diffuse tissue
|
[46]
|
|
Unlabelled DNA
|
Monitoring the electrochemical dissolution of chromium electrode array in a microfluidic system
|
[47]
|
|
Malaria, TB, HIV
|
CP-based integrated reader for malaria, TB and HIV
|
[48]
|
|
RBCs & WBCs
|
A glass-based tapered fiber-optic array and multi-frame imaging for RBCs and WBCs in transmission mode
|
[49]
|
|
Salmonella and E.coli
|
A paper microfluidic device and a Mie scattering-based IA for Salmonella and E. coli (102-105 CFU mL-1)
|
[50]
|
|
P. falciparum-infected and sickle RBCs
|
CP-based microscope for the bright field imaging of P. falciparum-infected and sickle RBCs in blood smears
|
[18]
|
|
Thyroid stimulating hormone (TSH)
|
CP-based Mie scatter optimized LFA for TSH with LOD of 0.4 mIU L-1
|
[51]
|
|
Aflatoxin B1 (AFB1)
|
Reader and LFIA using a competitive binding format for AFB1 with linearity of 5-1000 µg kg-1 and LOD of 5 µg kg-1
|
[52]
|
|
Single molecules
|
CP-based system using plasmonic substrates to detect surface enhanced Raman signals from solids and liquids
|
[53]
|
|
Hepatitis B and Human Immunodeficiency Virus (HIV)
|
Detection of biomarkers for Hepatitis B and HIV in nM range using a CP camera and an optomechanical cradle that monitors the intensity of light reflected by the surface using the CP’s LED for illumination
|
[54]
|
|
|
|
|
Supplementary Figure S1. (A) Schematic of a CP-based device for the colorimetric detection of Hg2+ [11]. Reprinted with permission from the American Chemical Society. (B) vitaAID accessory on an iPhone for the colorimetric detection of vitamin D [2]. Reprinted with permission from the Royal Society of Chemistry. (C) CP attachment and minicartridge for biochemiluminescent detection of cholesterol [31]. Reprinted with permission from the American Chemical Society. (D) A CP-based colorimetric reader using screen-based bottom illumination provided by gadgets [5]. Reprinted with permission from the Elsevier B.V. (E) CP attachment for wide-field fluorescent and dark field imaging along with its schematic [28]. Reprinted with permission from the Royal Society of Chemistry. (F) Schematic of a CP-based fluorescence microscope and its ray-tracing diagram [24]. Reprinted with permission from the American Chemical Society (G) A CP-based contact microscopy platform and a schematic of the CP attachment [49]. Reprinted with permission from the Royal Society of Chemistry.
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