Premium
Selective recovery of volatile flavour compounds using reversed‐phase polystyrene adsorbents
Author(s) -
Gehrke Maik,
Krings Ulrich,
Berger Ralf G.
Publication year - 2000
Publication title -
flavour and fragrance journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.393
H-Index - 70
eISSN - 1099-1026
pISSN - 0882-5734
DOI - 10.1002/(sici)1099-1026(200003/04)15:2<108::aid-ffj876>3.0.co;2-4
Subject(s) - amberlite , chemistry , adsorption , carvone , borneol , limonene , ion exchange resin , chromatography , desorption , polystyrene , aqueous two phase system , aqueous solution , organic chemistry , medicine , alternative medicine , traditional chinese medicine , pathology , essential oil , polymer
Thermodynamically and kinetically controlled adsorption capacities of derivatized polystyrenes were compared to a commercial polystyrene resin (Amberlite ® XAD 16), a strong acid, cationic exchanger (Amberlite ® 200), and a silica gel (Silikagel 100) using the binary model systems (−)‐limonene/(−)‐carvone and (−)‐α‐pinene/(−)‐borneol. Functionalization with –SCH 3 , –Br, –B(OH) 2 , –NO 2 , or –SO 3 Na decreased the overall adsorption capacity. Preferred adsorption of (−)‐carvone to (−)‐limonene was achieved with the sulphonated resin in the aqueous phase. Salting‐out experiments showed that the inevitable competition of water molecules dominated, and that (−)‐limonene adsorption remained to be kinetically favoured. In n ‐hexane, however, both (−)‐carvone and (−)‐borneol were preferentially adsorbed, with loadings 10 times higher than in water with 300 g/l NaCl added. (−)‐Borneol loads on Amberlite 200 were only one quarter of the sulphonated XAD 16, and Silikagel 100 was not suitable for multiple adsorption/desorption cycles. Copyright © 2000 John Wiley & Sons, Ltd.