Other Components

Many analyses have been carried out on aloes in search of constituents which might be responsible for beneficial properties and various organic compounds additional to those described above reported from time to time. In a detailed study the composition ofvarious fractions of an A. arborescens plant was investigated as shown in Table 3.4 (Hirata and Suga, 1977). Another very detailed analysis, of A. vera this time, revealed a lipid content of c.5% of the dry gel (Femenia etal., 1999). The common plant sterol, ß-sitosterol was found in whole A. vera leaves, accompanied by lesser amounts ofcholesterol, campestrol and lupeol (Waller etal., 1978). Also observed were a number of unidentified volatiles, recognized by thin-layer chromatography. A further determination of ß-sitosterol was made in A. arborescens leaf (Yamamoto etal, 1990; Yamamoto etal, 1991) and again in A. vera leaf (Ando and Yamaguchi, 1990). Then, sitosterol glucoside and its palmitic acid ester were found in whole leaves of A. vera together with, again, lupeol (Kinoshita etal, 1996). A later study also showed ß-sitosterol and a variety of n-alkanes in the gel of A. vera with n-octadecane predominating, as well as fatty acids and their methyl esters (Yamaguchi etal, 1993). The main compnent of a steam distillate of a methanol extract of A. arborescens was 3-hydroxymethyl furan (Kameoka etal, 1981). Later, a milder steam distillation extracted a number of volatiles of which (Z)-3-hexanol and (Z)-3-hexanal were the major components, while headspace extraction yielded (Z)-3-hexanal

Table 3.4 Analysis of an A. arborescens plant (Hirata and Suga, 1977).

Leaves Roots

Table 3.4 Analysis of an A. arborescens plant (Hirata and Suga, 1977).

Leaves Roots

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Aloe and Your Health

Aloe and Your Health

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