Simple and rapid polyamide chromatography of antioxidants

✍ Scribed by R.-T. Wang; S.-S. Chou

• Book ID: 104145537
• Publisher: Elsevier Science
• Year: 1969
• Tongue: English
• Weight: 202 KB
• Volume: 43
• Category: Article
• ISSN: 1873-3778
• DOI: 10.1016/s0021-9673(00)99241-0

✦ Synopsis

Silica gel TLC does not throw any light on the homogeneity of individual o-or +alkylphenols having different chain lengths. However, reversed-phase TLC, with the solvent system acetic acid-water (80 : 20) , separates the o-or fi-alkyl phenol homologues due to the difference in the chain length of the alkyl groups. Fig. 3 shows that this technique effectively separates dodecyl, tetradecyl, hexadecyl and octadecyl phenols among the ortlzo or para class of compounds (items A, B, C and D; G, H, I and J) but does not distinguish isomeric alkyl phenols (items A and J; B and I ; C and H ; D and G) which can be separated only by silica gel TLC (Fig. z) , These separations also

indicate that resolution of some of the lower and higher homologues is possible. This method is useful in determining their purity. The results of all the separations are summarised in Table I.