1. Analysis of free and bound formaldehyde in squid and squid products by gas chromatography–mass spectrometry 
Tai-Sheng Yeh, Tzu-Chun Lin, Ching-Chuan Chen, Hwui-Mei Wen 
Journal of Food and Drug Analysis 
Volume 21, Issue 2, Pages (June 2013)
DOI: /j.jfda
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2. Fig. 1
Total ion chromatogram of 50 μg/mL standard solution of formaldehyde-DNPH, acetaldehyde-DNPH and propionaldehyde-DNPH. DNPH = 2,4-dinitrophenylhydrazine.
Journal of Food and Drug Analysis  , DOI: ( /j.jfda )
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3. Fig. 2
Mass spectrum of formaldehyde-DNPH. DNPH = 2,4-dinitrophenylhydrazine.
Journal of Food and Drug Analysis  , DOI: ( /j.jfda )
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