4040+e_22.docx / 06.10.17
ROBERT RIELE GmbH & Co KG
Page 42
6.4.16 Calculation Procedure 16 (DELTA R1R2)
Method for two endpoint assays to calculate the difference in absorbance (E1 and E2) after addition of two
reagents R1 and R2 to a sample. E1 represents the absorbance of a sample in addition with reagent 1 (R1) just
before a second reagent (R2) is added. E2 is the absorbance after adding R2. The course of the procedure is
outlined in Fig. 5.4.16.1.
The maximum number of samples depends on the length of the measure time of reagent 1 and 2 (T2 and T3).
The number of samples may be reduced by pushing [->R2] before starting the measurement or by skipping of
further samples during the first pipetting phase.
During the procedure the user is guided by indications on the screen (draw up and dispense reagent, etc., see
Fig. 5.4.16.2) and acoustic signals.
The factor F
dil
is the volume correction factor which is calculated on the basis of the given volumes (sample volume
(a), R1 volume (b) and R2 volume (c) on page 3/3 of the method parameters). The factor is set to 1.000 by default
when given volumes are not set.
A
S
= E2
– F
dil
* E1
whereby F
dil
= (a + b) / (a + b + c)
Fig. 5.4.16.1: time controlled measuring
Fig. 5.4.16.2: screen during the method
D E L T A R 1 R 2
S A M P L E S : 3
F d i l : 1 . 0 0 0 0
Z [ A ]
T I M E 4 s
N E X T A C T I O N A T T I M E 5 s
D I S P E N S E R E A : I N S A M P L E # 1
E X I T M O D E - > R 2 Z E R O R E S U L T
o 3 7 . 0 ° C i 3 7 . 0 ° C 0 7 / 2 4 / 2 0 1 7 1 0 : 1 4
0
Current time
name of active method
reading window
dimension
action keys
info line
Instructions
for next
action
Number of
samples