. Author manuscript; available in PMC: 2015 Jun 26.

Published in final edited form as: J Mol Biol. 2014 Apr 13;426(13):2422–2441. doi: 10.1016/j.jmb.2014.04.004

Table 2.

Comparison of the collision cross section data for Aβ42, iAβ42 conversion and Ac-iAβ42 at pH 7.4 in negative ion mode.

System		Aβ42		iAβ42→Aβ42		Ac-iAβ42

Oligomer	Charge State	σ(Å²)	σ/n	σ(Å²)	σ/n	σ(Å²)	σ/n

Monomers
solvent free	−3	635	635	657	657	652	652
solution-like	−3	702	702	718	718	712	712
Dimers	−5	1256	628	1282	641	1318	659
	−6	-	-	1587	743

Tetramer	−10	2332	583	2384	596	2204	551

Hexamer	−15	2898	483	2970	495	3024	504
Dodecamer(H₂)	−30	4307	359	4428	369	4440	370