Paprika (Capsicum annuum) oleoresin extraction with supercritical carbon dioxide
1999
Jaren-Galan, M. | Nienaber, U. | Schwartz, S.J.
Paprika oleoresin was fractionated by extraction with supercritical carbon dioxide (SCF-CO2). Higher extraction volumes, increasing extraction pressures, and similarly, the use of cosolvents such as 1% ethanol or acetone resulted in higher pigment yields. Within the 2000-7000 psi range, total oleoresin yield always approached 100%. Pigments isolated at lower pressures consisted almost exclusively of beta-carotene, while pigments obtained at higher pressures contained a greater proportion of red carotenoids (capsorubin, capsanthin, zeaxanthin, beta-cryptoxanthin) and small amounts of beta-carotene. The varying solubility of oil and pigments in SCF-CO2 was optimized to obtain enriched and concentrated oleoresins through a two-stage extraction at 2000 and 6000 psi. This technique removes the paprika oil and beta-carotene during the first extraction step, allowing for second-stage oleoresin extracts with a high pigment concentration (200% relative to the reference) and a red: yellow pigment ratio of 1.8 (as compared to 1.3 in the reference).
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