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Table 2 Recovery of morphine after hot extraction and filtration

From: Effect of filtration on morphine and particle content of injections prepared from slow-release oral morphine tablets

Filtration Volume of extract
(ml)
Amount of morphine
(mg)
P versus cig.
filter alone*
None 3.0 58.9 ± 1.3  
Cigarette filter    
First filtrate 2.1 ± 0.1 42.4 ± 0.9  
First rinse 1.0 ± 0.1 9.1 ± 1.9  
Second rinse 1.1 ± 0.1 2.7 ± 0.1  
Total 4.1 ± 0.1 54.3 ± 2.6  
Cotton wool    
First filtrate 1.6 ± 0.2 35.3 ± 4.4  
First rinse 1.1 ± 0.0 12.1 ± 2.3  
Second rinse 1.0 ± 0.2 5.2 ± 0.6  
Total 3.8 ± 0.3 52.6 ± 3.1 0.393
0.45 μm filter    
First filtrate 1.9 ± 0.2 41.2 ± 2.3  
Rinse 0.9 ± 0.1 10.7 ± 2.4  
Total 2.8 ± 0.2 51.8 ± 1.9 0.203
Combined filtration    
Cig.+ 0.45 μm filter 4.5 ± 0.3 52.4 ± 1.6 0.400
Cig. + 0.22 μm filter 4.3 ± 0.6 49.6 ± 2.0 0.096
  1. Data are mean ± SD, N = 3.
  2. *Comparison of morphine recovery by Mann-Whitney U test (a non-parametric analogue of the t-test), 2-tailed. Results are consistent with parametric analysis with Games-Howell post-hoc tests.