Table 2.

Specific phosphotransbutyrylase activity of different C. beijerinckii strains

Strain	Specific PTB activity (U mg−1 total protein)
	8-h growtha	27-h growth
C. beijerinckii NCIMB 8052	58.2 ± 2.2	67.3 ± 1.2
C. beijerinckii BAS/B3/I/124	80.6 ± 4.7	69.1 ± 5.2
C. beijerinckii NCP 260	37.1 ± 0.8	29.7 ± 2.9

^aValues are the average of five independent measurements ± SD

Phosphotransbutyrylase (PTB) activity was determined according to Andersch et al. [57] in CGM cultures of the late strain NCP 260 and the early strain BAS/B3/I/124. The strain NCIMB 8052 was used as a reference