New highly sensitive rodent and human tests for soluble amyloid precursor protein alpha quantification: preclinical and clinical applications in Alzheimer’s disease

Table 3 Stability of h-sAPPα in CSF stored at different conditions

Effect of storing CSF in polypropylene and polystyrene tubes
Samples	Polypropylene	Polystyrene	%
Samples	h-sAPPα (ng/ml)	h-sAPPα (ng/ml)	%
1	669 ± 20	659 ± 41	98 ± 6
2	399 ± 20	391 ± 24	98 ± 6
3	456 ± 2.5	412 ± 16	90 ± 3
4	535 ± 16	482 ± 18	90 ± 3
5	236 ± 2	212 ± 7	89 ± 3

Five CSF samples were divided into polypropylene or polystyrene tubes and stored for 24 hours at −80°C. Mean ± SEM of h-sAPPα in ng/ml and (%) compared to the aliquot stored in polypropylene tubes.

ISSN: 1471-2202