1. Rapid screening for detection and differentiation of detergent powder adulteration in infant milk formula by LC–MS 
Manjun Tay, Guihua Fang, Poh Ling Chia, Sam Fong Yau Li 
Forensic Science International 
Volume 232, Issue 1, Pages (October 2013)
DOI: /j.forsciint
Copyright © 2013 Elsevier Ireland Ltd Terms and Conditions

2. Fig. 1
PCA score plots (centering) of 0–20% D1 adulterated in M2 samples acquired by LC-Qtrap in 12min LC run time under (a) negative electrospray ionization with R2(cum) and Q2(cum) values of and respectively], (b) positive electrospray ionization with R2(cum) and Q2(cum) values of and respectively. The numbers represent % adulteration level and ‘R’ represents samples for inter-day reproducibility test.
Forensic Science International  , 32-39DOI: ( /j.forsciint )
Copyright © 2013 Elsevier Ireland Ltd Terms and Conditions

3. Fig. 2
PCA score plots (centering) of M1 samples adulterated with 20% of various detergent brands by LC-Qtrap, 25min LC run time under (a) negative electrospray ionization and (b) positive electrospray ionization.
Forensic Science International  , 32-39DOI: ( /j.forsciint )
Copyright © 2013 Elsevier Ireland Ltd Terms and Conditions

4. Fig. 3
Contribution plot of the difference between adulterated and pure M3 samples analyzed by negative electrospray ionization LC-Qtrap, 25min LC run time.
Forensic Science International  , 32-39DOI: ( /j.forsciint )
Copyright © 2013 Elsevier Ireland Ltd Terms and Conditions

5. Fig. 4
(a) 3D PCA score plot (centering) and (b) zoomed-in image of the boxed up region (left) of pure M1 and adulterated M1 samples with 20% various detergent brands analyzed by negative electrospray ionization LC-QTOF–MS in 25min LC run time.
Forensic Science International  , 32-39DOI: ( /j.forsciint )
Copyright © 2013 Elsevier Ireland Ltd Terms and Conditions

6. Fig. 5
Total ion chromatograms of pure M1 and adulterated samples containing 20% of various detergent brands by negative electrospray ionization LC-QTOF–MS, 25min run time.
Forensic Science International  , 32-39DOI: ( /j.forsciint )
Copyright © 2013 Elsevier Ireland Ltd Terms and Conditions

7. Fig. 6
MS/MS spectrum of m/z ion in M1 sample adulterated with 20% D1 analyzed by negative electrospray ionization LC-QTOF–MS, 25min LC run time.
Forensic Science International  , 32-39DOI: ( /j.forsciint )
Copyright © 2013 Elsevier Ireland Ltd Terms and Conditions