Molecules, 26 (24), 7683 (2021). Samples were ultrasound-assisted extracts of fruit puree and juice (pre-treated with sulfur dioxide or ascorbic acid) of Ananas comosus (Bromeliaceae) and Mangifera indica (Anacardiaceae). HPTLC on silica gel with toluene – ethyl acetate – methanol – formic acid 120:90:35:3. Detection under white light, UV 254 nm and 366 nm, before and after  derivatization by immersion (2 s, 3 cm/s) into anisaldehyde sulfuric acid reagent and  diphenylamine aniline reagent, followed by heating at 110 °C for 5 min. Effect-directed analysis using automated immersion: A) for free radical (DPPH•) scavengers; B) for enzymatic inhibition (acetyl-cholinesterase, tyrosinase); C) for activity against Gram-negative (Aliivibrio fischeri bioluminescence assay) or Gram-positive bacteria (Bacillus subtilis bioassay). Active compounds were far more present in puree than in juice extracts, and differences were also seen between cultivars. Ascorbic acid (hRF 37), used as additive for the mango puree, was active as antioxidant and as transiently disruptive for A. fischeri metabolism and bioluminescence.

Detection limit 300 -1000 ng for BHA, BHT and PG, resp. Also GC.

Kautschuk + Gummi - Kunstoffe 41 (9) 875-881 (1988). TLC of antioxidants IPPD (N-isopropyl-N'-phenyl-p-phenylene-diamine), 6PPD (N-1,3-dimethyl-butyl-N'-phenyl-diamine), N,N'-diaryl-PPD (N,N'-diaryl-p-phenylene-diamine) and TMQ (2,2,3-trimethyl-1,2-dihydroquinoline) on silica with chloroform - hexane - methanol - acetic acid 15:6:1:1. To remove plasticizers the TLC plate is chromatographed twice with petrol ether first. Detection by multi-wavelength scanning of UV absorbance at 240, 280, 320, 360 nm and visually by spraying with 3% ethanolic solution of 2,6-dichloroquinone-4-chlorimide. Additionally identification by recording of UV spectra. A further mobile phase system (toluene - hexane - methanol 29:15:6) is mentioned.

J. Planar Chromatogr. 15, 294-298 (2002). TLC of 8 N-phenylsuccinimide derivatives on silica gel and on silica gel impregnated with paraffin with n-hexane - dioxane and n-hexane - acetone resp. acetone - water in different ratios. Visualization under UV 254 nm. The RP TLC method can be successfully used for separation of the succinimide derivatives.

Chem. Pharm. Bull. 34, 174-181 (1986). Description of a method for determination of the antioxidative activities of chemicals. Application of 1 Ál mixture of linolenic acid and test sample in ethanol to HPTLC plate, and peroxidation at 80 °C for 20 min. Detection of the lipid peroxides produced by spraying with alpha-methylindole reagent. Measurement by densitometry at 557 nm. Expression of the antioxidative activity of the test sample as the amount required to inhibit the peroxidation of linolenic acid by 50 %.

J. Planar Chromatogr. 9, 39-47 (1996). HPTLC of 30 preservatives on silica, RP-18, CN, diol with 5 different mobile phases; detection with nine different methods. The procedure based on hRf values and color codes can be used for the detection and identification of the preservatives after being entered into a user-generated data base. The data compilations comprise the retention values obtained after chromatography using 5 different chromatographic systems (adsorption, partition, and reversed phase) and the colors obtained upon spraying with selected reagents, the color codes being read by the user from a color key card. By combination of more than two chromatographic systems, identification of unknown samples becomes reliable.

CBS 87, 13-15 (2001). HPTLC of antioxidants on silica gel with cyclohexane - ethyl acetate 49:1 containing 2 mg/mL butylated hydroxytoluene over a distance of 25 mm after preconditioning with solvent vapor for 5 min. Quantitative determination by absorbance measurement at 442 nm.

J. Agric. Food Chem. 34, 1-5 (1986). TLC separation of DHDP (3,3'-bis (1,1-dimethylethyl)-5,5'-dimethoxy-1,1'-biphenyl-2,2'-diol) on silica with dichloromethane - methanol - acetic acid 80:20:1 and hexane - benzene - ether 90:30:3. After cutting the plate into portions, determination of (14C) compounds by liquid scintillation; detection by autoradiography.