^^ 



/ 



i(Bft:«)S»»«v? 



357 



700. , and Burks. M. L. 1971. Absorption and metabolism of galactose and 

 galactitol in Anthonomus grandis . J. Insect Physiol. 17: 1615-1623. 



Galactitol is a significant metabolite of galactose in fasted adults of 

 Anthonomus grandis ; this is Che first time that galactitol has been found 

 to be a metabolite of galactose in an insect in vivo . Galactitol is not 

 metabolized, and galactose, at best, is poorly metabolized by the boll weevil 

 to trehalose and glycogen. Because sizeable quantities appear in the haemo- 

 lymph when fed, galactose and galactitol must be readily absorbed through 

 the gut. 



701. , and Burks, M. L. 1973. Metabolism of sugars to polyols in the 

 boll weevil. J. Insect Physiol. 19: 1677-1687. 



When fed to starved '.dults of Anthonomus grandis , several pentoses and 

 hexoses were metabolized to the corresponding polyols (sugar alcohols) . 

 Xylitol, galactitol, arabitol, ribitol, rhamnitol, mannitol, and sorbitol 

 were metabolites of DOxylose, D-galactose and lactose, D-arabinose, D-ribose, 

 L-rhamnose, D-mannose, and D-glucose and D-fructose, respectively. L-Sorbose 

 was not metabolized to a polyol. Large quantities of xylitol and galactitol 

 and intermediate amounts of arabitol, ribitol, and rhamnitol accumulated 

 while only small amounts or traces of mannitol and sorbitol were detected. 

 The limited accumulation of sorbitol in the glucose- and fructose-fed 

 weevils probably was caused by the rapid metabolism of sorbitol to glucose, 

 fructose, trehalose, and glycogen. Each of the ingested sugars, the corres- 

 ponding polyols, and trehalose were present in the weevil haemolymph. Most 

 of the polyols had never before been detected as metabolites in an insect. 



702. ; Parro, B.; Sharbaugh, C; and Mangura, C. L. 1972. Trehalose and 

 other carbohydrates in diapausing and starving boll weevils. Ann. 

 Entomol, Soc. Am. 65: 554-558. 



