HPLC/ESI-MS
HPLC/ESI-MS method was also fully validated in terms of precision,
accuracy, linearity, limits of detection (LODs) and limits of
quantification (LOQs) as described above for the HPLC/DAD
method (Table 1). The method showed good precision, demonstrated
by the RSD (%) of the inter and intra-day studies, which ranged
from 1.41 to 4.80 and 2.97 to 4.61, respectively. The percent of
recovery in spiking study (Table 1) was within the accepted limits,
indicating good accuracy of the method, and all the analytes demonstrated
good linearity (R2 P 0.9992). The HPLC/ESI-MS method
was more sensitive, as LODs and LOQs ranged from 0.01 to
0.025 lg/ml and 0.03 to 0.075 lg/ml, respectively, which are lower
than the corresponding values of HPLC/DAD. For these reasons we
decided to apply HPLC/ESI-MS method for the subsequent
quantitative analysis of the gentian samples. The calibration ranges
HPLC/ESI-MSHPLC/ESI-MS method was also fully validated in terms of precision,accuracy, linearity, limits of detection (LODs) and limits ofquantification (LOQs) as described above for the HPLC/DADmethod (Table 1). The method showed good precision, demonstratedby the RSD (%) of the inter and intra-day studies, which rangedfrom 1.41 to 4.80 and 2.97 to 4.61, respectively. The percent ofrecovery in spiking study (Table 1) was within the accepted limits,indicating good accuracy of the method, and all the analytes demonstratedgood linearity (R2 P 0.9992). The HPLC/ESI-MS methodwas more sensitive, as LODs and LOQs ranged from 0.01 to0.025 lg/ml and 0.03 to 0.075 lg/ml, respectively, which are lowerthan the corresponding values of HPLC/DAD. For these reasons wedecided to apply HPLC/ESI-MS method for the subsequentquantitative analysis of the gentian samples. The calibration ranges
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