Grasas y Aceites, Vol 59, No 1 (2008)

Supercritical CO2 extraction of sweet and hot paprika

J. Pablo Fernández-Trujillo
Departamento de Ingeniería de Alimentos y Equipamiento Agrícola, Spain


Paprika extraction by supercritical CO2 (ESCO2) dependson sample pretreatment (milling, pelletization), the static ordynamic conditions of the pressure, temperature, extraction time, solvent flow and density, the steps of the extractions, or the use of cosolvents. The best conditions according to the literature are prepelletizing samples and extracting at 40 °C in two steps: 13,8-15 MPa for aroma volatiles and β-carotene, followed by 40 MPa for other carotenoids (capsorubin,capsanthine, zeaxanthine, and β-cryptoxanthine). In general, supercritical CO2 extract better the capsaicinoids andtocopherols than the red xanthophylls. To extractcapsaicinoids, 32-40 MPa y 40-55 °C have been used, and for chlorophyll pigments in some cultivars and stages of maturity 36 MPa and 45 °C. For tocopherols, 20 MPa and 55 °C or the above conditions have been advised. Depending on the raw paprika composition and the optimum conditions used for the extraction, the yields are variable: 5,2-17,4% (total), 2-3%carotenoids, 0,7–8,6% capsaicinoids in pungent oleoresin and 370-400 μg tocopherols • g-1 oleoresin (mainly the atocopherolisomer). The recovery of the compounds ofinterest by fractionation and optimization of the raw materialand extraction process is 90-100%. Ethanol, water and aceticacid are used as cosolvents to extract capsaicinoids, and forβ-carotene the 2,2-dimethoxypropane or ESCO2 plus adsorption in silica gel. The ESCO2 allows extracting anoleoresin free from paprika contaminants. The main hazards and critical control point are derived from the high pressure of the CO2, the homogeneity of the solute distribution depending on the previous pretreatments, and the variability of the results in pigment composition compared with that obtained by means of conventional extraction, as well as the difficult to reproduce laboratory results to an industrial scale. The innovations in paprika ESCO2 extract are the aromatized extracts, colorants or deodorized extracts, capsaicinoids extract for food or other uses, as well as oleoresins enrichedin zeaxanthines that it is possible to obtain.


Capsaicinoids; Carotenoids; Cosolvent; Paprika; Supercritical fluid; Tocopherols

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