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Cholesterol, ß-Sitosterol, Ergosterol, and Coprostanol in Agricultural Soils

Istituto di Chimica Agraria ed Ambientale, Università Cattolica del Sacro Cuore, 29100 Piacenza, Italy

View larger version (20K): [in a new window]   Fig. 1. Ion gas chromatogram of sterols extracted from a soil sample.

View larger version (11K): [in a new window]   Fig. 2. Site behavior of ergosterol, ß-sitosterol, and cholesterol, showing average values and standard deviations.

View larger version (16K): [in a new window]   Fig. 3. Concentrations of coprostanol in treated and untreated samples from Cremona (CR) and Naples (NA).

View larger version (26K): [in a new window]   Fig. 4. Principal component analysis performed on soil sterol content after a varimax rotation (Proc FACTOR; SAS Institute, 1985). Different symbols were assigned to altered and unaltered soils in each site: Cremona, pyramids and cubes; Bari, hearts and spades; Naples, flags and squares.