Premium
The lipids of the common house cricket, Acheta domesticus L. III. Sterols
Author(s) -
Martin Michael M.,
Carls Glen A.
Publication year - 1968
Publication title -
lipids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.601
H-Index - 120
eISSN - 1558-9307
pISSN - 0024-4201
DOI - 10.1007/bf02531197
Subject(s) - acheta , sterol , chemistry , fraction (chemistry) , chromatography , biochemistry , biology , cholesterol , cricket , ecology
Sterols constitute 1.95% of the total extractable lipids of Acheta domesticus L., of which 18% are esterified. The free sterols consist of cholestane‐3β‐ol (0.5%), Δ 5 ‐cholestene‐3β‐ol (83.5%), Δ 7 ‐cholestene‐3β‐ol (2.3%) Δ 5,7 ‐cholestadiene‐3β‐ol (3%), Δ 5,22 ‐cholestadiene‐3β‐ol (4%), Δ 5,7,22 ‐cholestatriene‐3β‐ol (0.2%), campestane‐3β‐ol (0.03%), Δ 5 ‐campestene‐3β‐ol (1.0%), Δ 7 ‐campestene‐3β‐ol (trace), Δ 5,7 ‐campestadiene‐3β‐ol (0.2%), stigmastane‐3β‐ol (0.09%), Δ 5 ‐stigmastene‐3β‐ol (2.1%), Δ 7 ‐stigmastene‐3β‐ol (0.04%), Δ 5,7 ‐stigmastadiene‐3β‐ol (0.4%), Δ 5,22 ‐stigmastadiene‐3βol (0.1%). The same sterols are present in the esterified sterol fraction. Δ 7 ‐Sterols and Δ 5,7 ‐sterols are present in significantly larger amounts in the esterified fraction than in the free sterol fraction. By a comparison with the sterols of the cricket food, it is clear that A. domesticus is capable of removing methyl and ethyl groups from C‐24 of sterols of the campestane and stigmastane type. The ability to introduce a Δ 7 double bond into saturated and Δ 5 ‐sterols is indicated, and it is suggested that Δ 7 ‐sterols of the C 27 , C 28 , and C 29 sterol series may be intermediates in the conversion of Δ 5 ‐sterols to Δ 5,7 ‐sterols.