The following paper (which can be found at www.wolfson.huji.ac.il/purification/PDF/Literature/Bondos2003.pdf
Detection and prevention of protein aggregation before, during, and after purification. Sarah E. Bondos and Alicia Bicknell (2003) Analytical Biochemistry, 316, 223-231
contains a table of "agents that may promote protein solubility" on the 2nd page. Most are non-detergents which may be worth following up as well as Tween 80, Tween 20 and Nonidet P-40 at the recommended concentrations and their references.
Dan
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