<![CDATA[The ethanol extract of purple sweet potato leaves (Ipomoea batatas L. or “IBL”) has antidiabetic activity, and the total flavonoid (KTF) is designated as the quality marker (Q-marker) in capsule manufacturing. This research aims to develop KTF As a Q-marker for OHT capsules from ethanol extract of IBL leaves as antidiabetic. KTF Q-marker determination involves: (1) Identification of the absorption peak of the quercetin-AlCl3 complex, (2) Method verification, and (3) Testing OHT capsule content uniformity. The Quersetin-AlCl3 complex provides a bathochromic shift in band I from 380 nm before being reacted towards 430 nm after complex formation. The method verification test resulted in a correlation coefficient of 0.998, intraday RSD of 0.76-2.00%, and interday RSD of 0.87-1.96%, and accuracy of return in the range 82.88-91.83%. The consistency test results of the capsule content of the four bets obtained a ratio of the content of 10 capsules of each bet of 100% and RSD value in the range of 3.22-4.57% The establishment of KTF with a method in accordance with the FHI has met the verification requirements, showing that the method can be used and potentially as a quality control in the manufacture of IBL leaf capsules on a production scale.]]>
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