J. AOAC Int. 78, 1328 - 1332 (1995). TLC of sodium salts of tripolyphosphate, pyrophosphate, phosphate dibasic, and phosphate monobasic on cellulose with isopropanol - propanol - trichloroacetic acid - NH3 - water 200:175:25:1:125. Detection by spraying with molybdenum blue spray reagent. - Exogenous polyphosphates are distinguishable from naturally occurring phosphates; TLC detection of added phosphates can be used as an inspection tool for fresh products and for frozen products stored about 1 year.

Merck KGaA (Ed.): Chromatographie - Chronologie einer Analysentechnik - Praxis, Status, Trends, GIT Verlag mbH, Darmstadt, 222-230, ISBN 3-928865-21-8 (1996). Description of the experimental practice of the German standard DIN 38407, part 11, the field of usage and the steps of the whole procedure. Reasons for the determination limit of the procedure of 50 ng/L are given. Critical points and factors of influence are demonstrated during handling of the samples after sampling, during solid phase extraction, concentration of the eluate and AMD chromatography. The stepwise confirmation of positive results and thereby the flexibility of the method are shown.

CBS 83, 9-11 (1999) HPTLC of histamine in fish on RP-18 W with n-propanol - 25 % ammonia 4:1 without chamber saturation. Detection by dipping in Pauly’s reagent. Evaluation with video technology and quantitative determination by absorption measurement at 530 nm.

J. Planar Chromatogr. 17, 147-148 (2004). TLC of capsaicin on silica gel with concentration zone with toluene - acetone - chloroform 8:7:5 and 9:6:5. Detection by spraying with a 0.25 % ethanolic solution of 2,6-dichloroquinone-4-chlorimide or by exposure to iodine vapor.

CBS 95, 2-4 (2005). TLC of seven biogenic amines (extracted with trichloroacetic acid from fish, followed by dansylation with dansyl chloride) on silica gel (prewashed with developing solvent) with benzene - chloroform - triethylamine 10:6:7 or 10:6:2 in horizontal developing chamber over 90 mm. Quantitative determination by fluorescence measurement at 365 nm/> 400 nm. Calibration using peak area, LOD 7.5 mg/kg, LOQ 56 mg/kg.

J. Planar Chromatogr. 19, 10-14 (2006). OPLC of D-xylitol, L-arabitol, D-glucitol , D-xylose, L-arabinose, D-glucose, and L-rhamnose on silica gel with overrunning elution. Acetonitrile - acetic acid - water 63:33:5 was used as mobile phase. The upper limits of linearity were in the range 140-600 ng and detection limits were 15-50 ng per spot.

Anal. Bioanal. Chem. 387, 1083-1093 (2007). A new HPTLC method for trace analysis (low µg/kg range) of the five heterocyclic aromatic amines PhIP (2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine), MeIQx (2-amino-3,8-dimethylimidazo[4,5-f]quinoxaline), 4,8-DiMeIQx (2-amino-3,4,8-trimethylimidazo[4,5-f]quinoxaline), norharmane (9H-pyrido[3,4-b]indole) and harmane (1-methyl-9H-pyrido[3,4-b]indole) in meat samples has been established. HPTLC on LiChrospher silica gel WRF with methanol – chloroform 1:9. Using the ADC2, the plate activity was adjusted to 34 % relative air humidity with MgCl2 x 6H2O for 15 min and, at the same time, chamber saturation with 35 mL aqueous ammonia 28 % – ultrapure water 1:4 was performed for 20 min, followed by alkaline plate preconditioning for 15 min. The development was performed in a fresh chamber. Quantitative determination by absorbance measurement at UV 262 nm and 316 nm, and fluorescence measurement at UV 366/>400 nm. The UV wavelength 316 nm was later substituted by 313/>340 nm for a more selective and sensitive determination of PhIP in the meat matrix. Mass spectrometric analysis was performed in ESI+ mode for confirmation of positive findings. The method was validated according to ICH guidelines. Repeatability was better than 3.3 % (n=14), the intermediate precision (n=6, peak area) was 0.4 % (PhIP), 0.6 % (MeIQx), 0.7 % (4,8-DiMeIQx), 0.9 % (norharmane) and 1.1 % (harmane). Reproducibility of the migration distance was better than 1.3 % (n=6). LODs were 4 ng/band for PhIP, 5 ng/band for MeIQx, 4 ng/band for 4,8-DiMeIQx, and 0.4 ng/band each for norharmane and harmane. LOQs were 6 ng/band for PhIP, 14 ng/band for MeIQx, 11 ng/band for 4,8-DiMeIQx, and 0.8 ng/band each for norharmane and harmane. Selectivity in the meat matrix was proven. Confirmation of the substances found in meat was performed by MS. In the working range RSDs of the calibration functions were between 1.9 and 3.6 %.

J. Planar Chromatogr. 20, 317-320 (2007). HPTLC of mangiferin (a C-glucosyl xanthone) on silica gel with ethyl acetate - methanol - water - formic acid 20:2:2:1. Detection and quantification were performed densitometrically at 270 nm.