Table 1.

Number of identical m/z signals between repeated analyses of each sample. A, B and C refers to the three cultivation replicates, RSD at p = 0.05 (in parentheses), n = number of comparisons.

Analysis	Storage	Number of Freeze/Thaw Cycles	Number of Identical m/z Signals	n
First	Fresh sample	0	89.6% (3.6)	30
Second	One week at −78 °C	1	A 80.7% (2.8)	10
			B 79.2% (4.2)	10
			C 80.3% (3.1)	10
			Average 80.1%
Third	One additional week at −20 °C	2	A 67.3% (3.4)	10
			B 76.7% (6.1)	10
			C 74.4% (3.9)	10
			Average 72.8%