1. Gold nanoparticles grafted modified silica gel as a new stationary phase for separation and determination of steroid hormones by thin layer chromatography 
Mitra Amoli-Diva, Kamyar Pourghazi 
Journal of Food and Drug Analysis 
Volume 23, Issue 2, Pages (June 2015)
DOI: /j.jfda
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2. Fig. 1 Structure of (A) progesterone and (B) testosterone.
Journal of Food and Drug Analysis  , DOI: ( /j.jfda )
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3. Fig. 2
(A) UV–Vis spectrum and (B) TEM image of the prepared Au NPs. Au NP = gold nanoparticle; TEM = transmission electron microscopy; UV–Vis = ultraviolet–visible.
Journal of Food and Drug Analysis  , DOI: ( /j.jfda )
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4. Fig. 3
Schematic illustration of preparation of Au NPs-APTS modified silica gel stationary phase. Au NPs-APTS = gold nanoparticles grafted 3-triethoxysilyl propylamine.
Journal of Food and Drug Analysis  , DOI: ( /j.jfda )
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5. Fig. 4
Densitograms of standard solution of progesterone and testosterone (50 ng per spot) on the Au NPs-APTS modified silica gel plate. Au NPs-APTS = gold nanoparticles grafted 3-triethoxysilyl propylamine; PRO = progesterone; TES = testosterone.
Journal of Food and Drug Analysis  , DOI: ( /j.jfda )
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6. Fig. 5
Densitograms of sample solution (urine) containing progesterone and testosterone (50 ng per spot) on the plain silica gel plate. PRO = progesterone; TES = testosterone.
Journal of Food and Drug Analysis  , DOI: ( /j.jfda )
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7. Fig. 6
Densitograms of sample solution (urine) containing progesterone and testosterone (50 ng per spot) on the Au NPs-APTS modified silica gel plate. Au NPs-APTS = gold nanoparticles grafted 3-triethoxysilyl propylamine; PRO = progesterone; TES = testosterone.
Journal of Food and Drug Analysis  , DOI: ( /j.jfda )
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