Rahma U, Zulfajri M, Ismulyati S. Evaluation of anthocyanin extracted from Lempeni (Ardisia Elliptica l.) fruit as a new natural acid-base indicator. IJBCh [Internet]. 2025 Jun. 30 [cited 2025 Aug. 24];18(1):159-66. Available from: https://ijbch.kaznu.kz/index.php/kaznu/article/view/942