Fig. 4.
Amyloid-β 1–42 (Aβ1–42) concentrations recovered from 0.1-ml and 0.5-ml aliquots of cerebrospinal fluid (CSF) dispensed into different tube types with or without Tween-20 pretreatment as measured by the AlzBio3 assay. Aβ1–42 recovery from patients with Alzheimer’s disease (n = 2) after 0.1-ml or 0.5-ml volumes of CSF were dispensed into three low-retention polypropylene tube types and then assayed in the absence (white bars) or presence (gray bars) of Tween-20. a and b Axygen MAXYMum Recovery® tubes. c and d Thermo Scientific Matrix® tubes. e and f Eppendorf LoBind® tubes (1.5-ml capacity)