@article {1701, title = {Tyrosinase Inhibitory Activity of Garcinia latissima Miq. Extracts}, journal = {Pharmacognosy Journal}, volume = {13}, year = {2021}, month = {December 2021}, pages = {1673-1677}, type = {Research Article}, chapter = {1673}, abstract = {

Background: Tyrosinase is an enzyme that plays an essential part in the process of melanin synthesis. High exposure to ultraviolet (UV) radiation or high stimulation of melanocytes could cause excessive melanin pigments to lead to hyperpigmentation. Objective: This study aimed to find potential natural skin lightening ingredients from Garcinia latissima Miq. Methods: Stem bark, fruits, and leaves of Garcinia latissima Miq. were extracted with successive maceration. The tyrosinase inhibitory activity test was measured spectrophotometrically at 490 nm using 3,4-dihydroxy-L-phenylalanine (L-DOPA) as substrate and kojic acid as a positive control. Results: The tyrosinase inhibitory activity test at a concentration of 100 ppm showed that the bark ethyl acetate extract 15.94\% {\textpm} 7.70, bark methanol extract of 28.94\% {\textpm} 5.73, fruit n-hexane extract 25.16\% {\textpm} 10.22, fruit methanol extract 23.26\% {\textpm} 9.10; and leaf methanol extract 30.59\% {\textpm} 0.63 with kojic acid inhibition 65.07\%. Conclusion: Methanol extract of leaf from Garcinia latissima Miq was the most active extract as a tyrosinase inhibitor.

}, keywords = {Extract, Garcinia latissima Miq., Succesive maceration, Tyrosinase}, doi = {10.5530/pj.2021.13.215}, author = {Neneng Siti Silfi Ambarwati and Berna Elya and Yesi Desmiaty and Ayun Erwina Arifianti and Islamudin Ahmad} } @article {1113, title = {Establishment of Simple Cell-based Screening Assay and the Identification of Potent Antiviral Activity of a Plant Extract against HSV-1}, journal = {Pharmacognosy Journal}, volume = {12}, year = {2020}, month = {March 2020}, pages = {251-259}, type = {Original Article}, chapter = {251}, abstract = {

Backgrounds: Drug screening is a time-consuming and costly process confronted with low productivity and challenges in using animals, which limits the discovery of new drugs. The cellbased assay allows the minimization of using the animal models and can provide more relevant in vivo biological information than biochemical assay. Objective: We aimed to establish a simple cell-based screening assay for the discovery of lead extract against HSV-1. Materials and Methods: Assay setting up was performed by optimization of the cell, incubation time, virus titer, and determination of Z value. Results: We have successfully established reproducible methods, by setting up assay plate including determination: 1) Vero cells as a model for HSV-1 infection, 2) Incubation for 5 days as sufficient time for CPE endpoint at monolayer cells, 3) 100 TCID50/well HSV-1 as infection titer which caused high percentage of cell detachment, 4) determination of Z value of 100 TCID50/well infection \> 0.5. In addition, the established system was tested using ACV as the most common anti-HSV drug. Furthermore, we demonstrated the current system to screen extracts from Acacia nilotica, Uncaria gambir and Aspalathus linearis against HSV-1. It was observed that the alkaline extract of Uncaria gambir exhibited the highest SI (12.5) compared to other extracts. Conclusion: We demonstrated current cellbased screening system was reproducible and able to identify lead extracts against HSV-1 infection.

}, keywords = {HSV-1, Natural product activity, Simple cell-based screening}, doi = {10.5530/pj.2020.12.39}, author = {Ratika Rahmasari and Takahiro Haruyama and Muhareva Raekiansyah and Farhana Mossadeque and Marina Ika Irianti and Ayun Erwina Arifianti and Nobuyuki Kobayashi} } @article {847, title = {Antioxidant and Tyrosinase Inhibitor Activities of Ethanol Extracts of Brown Seaweed (Turbinaria conoides) as Lightening Ingredient}, journal = {Pharmacognosy Journal}, volume = {11}, year = {2019}, month = {February 2019}, pages = {379-382}, type = {Original Article}, chapter = {379}, abstract = {

Background: Turbinaria conoides is one of abundant brown macroalgae in Indonesian oceans contains phenolic derivatives. Phloroglucinol is a multifunctional phenolic derivative in brown algae. Phloroglucinol has been known to have activity inhibitor tyrosinase, because phloroglucinol is copper chelating agent. The antioxidant and the tyrosinase inhibitor activities are parameters of the skin lightening active ingredient. The mechanism of tyrosinase inhibitors is to decrease skin pigmentation by inhibit the catalytic steps of the enzyme to the pigmentation associated with melanin production in the pathway of melanogenesis. Antioxidant activity protects skin against oxidative stress mediated by UVR. Numerous report have determine phenolic compound of T. conoides as antioxidant but none is reported as tyrosinase inhibitor. Objective: The objective of this study is to determine the activities of T. conoides as antioxidant and tyrosinase inhibitor. Methods: Turbinaria conoides were extracted with ethanol with different concentration (30\%, 50\% and 70\%) by maceration method. Crude ethanolic extracts of T. conoides were determined its total phenolic content, antioxidant activity (DPPH) and tyrosinase inhibitor. Results: E50 showed the highest total phenolic content (27.63{\textpm}1.05 mg PGE/g extract). Antioxidant and tyrosinase inhibitor activities of E50 showed IC50 value of 215.96 μg/mL and 188.85 μg/mL, respectively. Conclusion: Ethanol extract of Turbinaria conoides is potential as antioxidant agent and tyrosinase inhibitor.

}, keywords = {Antioxidant, Lightening agent, Phloroglucinol, total phenolic content, Turbinaria conoides}, doi = {10.5530/pj.2019.11.58}, author = {Diani Mega Sari and Effionora Anwar and Nurjanah and Ayun Erwina Arifianti} }