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Cassia siamea  leaf has been proven  in vitro  and  in vivo  to have a strong antimalarial activity with Cassiarin A as its active compound. To obtain a source of  C. siamea  medicinal plant with high level of active antimalarial compound (Cassiarin A), a valid method for determining Cassiarin A level is needed. For this reason, this research conducts the validation of the Cassiarin A content with determination method using thin-layer chromatography (TLC) densitometry which includes the determination of selectivity ( R s), linearity (r), accuracy, precision, limit of detection (LOD), and limit of quantification (LOQ). Cassiarin A was chromatographed on silica gel 60 F 254  TLC plate using chloroform : ethanol (85 : 15 v/v) as a mobile phase. Cassiarin A was quantified by densitometric analysis at 368 nm. The linear regression analysis data for the calibration plots showed good linear relationship with  r  = 0.9995. The method was validated for precision, recovery, repeatability. The minimum detectable amount was found to be 0.0027  μ g/spot, whereas the limit of quantitation was found to be 0.008  μ g/spot. The results of this validation are then used to determine the Cassiarin A level of  C. siamea  leaf from various regions in Indonesia. Based on the results of the study, it can be concluded that the TLC-densitometry method can be used to determine level of the Cassiarin A compound with the advantages of being fast, easy, accurate, and inexpensive. In addition, it showed that  C. siamea  leaves from Pacitan have the highest level of Cassiarin A compared to other areas studied.

Determination of Cassiarin A Level of Cassia siamea Leaf Obtained from Various Regions in Indonesia Using the TLC-Densitometry Method