@article {2557, title = {Quantification of Phenolics, Flavonoids, and In Vitro Antioxidant Activity in Rosella and Breadfruit Leaf Extracts}, journal = {Pharmacognosy Journal}, volume = {17}, year = {2025}, month = {December 2025}, pages = {688-698}, type = {Original Article}, chapter = {688}, abstract = {

Indonesia is a country rich in biodiversity, with numerous plant species traditionally used in medicine. One such plant is breadfruit (Artocarpus altilis), whose leaves contain bioactive compounds such as flavonoids, saponins, tannins, quercetin, artocarpanone, and artoindonesianin. Another plant with high medicinal value is roselle (Hibiscus sabdariffa L.), a tropical plant from the Malvaceae family known for its rich phenolic content. Both plants are widely found across Indonesia and have potential as natural antioxidants. In this study, the dry extracts were prepared using the decoction method followed by spray drying. Phytochemical screening, total phenolic and flavonoid content analysis, and antioxidant activity tests were performed using standard in vitro methods. The DE2C extract (a combination of breadfruit leaves and roselle flowers) exhibited high total phenol content at 0.953 {\textpm} 0.005 g GAE/100 g and flavonoid content at 136.97 {\textpm} 5.050 μg QE/100 g. Meanwhile, the DE3C extract showed an IC$_{5}$$_{0}$ value of 540.55 ppm in the DPPH assay. Pearson correlation analysis showed a strong positive correlation between total phenolic content and antioxidant activity (R = 0.956, p \< 0.05), while flavonoids also showed a moderate correlation (R = 0.502, p \< 0.05). These results confirm that phenolic compounds play a key role in the antioxidant potential of the extract.

}, keywords = {Flavonoids, Quantification of Phenolics}, doi = {10.5530/pj.2025.17.86}, author = {Hesti Riasari and Sani Nurlaela Fitriansyah and Siti Uswatun Hasanah and Mia Aulia and Khania Zavella and Nurul Padilah} } @article {1124, title = {Chemical Constituents, Antibacterial Activity and Mode of Action of Elephant Ginger (Zingiber officinale var. officinale) and Emprit Ginger Rhizome (Zingiber officinale var. amarum) Essential Oils}, journal = {Pharmacognosy Journal}, volume = {12}, year = {2020}, month = {March 2020}, pages = {404-409}, type = {Research Article}, chapter = {404}, abstract = {

Introduction: Ginger (Zingiber officinale Rosc) is a spice plant, which is extensively used worldwide, and morphologically classified into three types, including the red, {\textquotedblleft}gajah{\textquotedblright} or {\textquotedblleft}elephant{\textquotedblright}, and {\textquotedblleft}emprit{\textquotedblright} ginger (common name in Indonesia). In addition, the extract and essential oils possess antibacterial pharmacological activities, due to the inherent constituents. The aim of this research, therefore, was to analyze the chemical constituents, test antibacterial activities, and observe the mode of action of elephant and emprit ginger rhizome essential oils. Methods: Essential oils isolation was conducted using water and steam distillation method, while microdilution method was adopted in the testing for antibacterial activities against Gram positive and negative bacteria. Furthermore, the mode of action was evaluated using Scanning Electron Microscopy (SEM). Results: The antibacterial activity demonstrated antibacterial activities in the essential oils of elephant and emprit ginger rhizome, with minimal inhibition concentrations (MIC) value of 250-1000 μg.mL-1 and minimal bacterial concentrations (MBC) value of 500-1000 μg.mL-1, while chemical evaluation showed the presence of 45 and 38 constituents, respectively. Conclusion: Both essential oils possess antibacterial activities against Gram positive and negative bacteria, with different strengths, which are based on chemical composition. Conversely, SEM micrographs demonstrated the ability for elephant and emprit ginger rhizome essential oils to change the morphology of bacteria.

}, keywords = {Antibacterial, Chemical constituents, Elephant ginger, Emprit ginger}, doi = {10.5530/pj.2020.12.62}, author = {Diki Prayugo Wibowo and Ria Mariani and Siti Uswatun Hasanah and Diah Lia Aulifa} }