@article {2127, title = {Total Phenolic and Flavonoid Contents, Anti-tyrosinase and Antioxidant Activities of Pachyrhizus erosus Extracts}, journal = {Pharmacognosy Journal}, volume = {15}, year = {2023}, month = {October 2023}, pages = {839-842}, type = {Research Article}, chapter = {839}, abstract = {

Background: The storage roots of Pachyrhizus erosus (PE) have been traditionally used as a skin whitening agent in Indonesia and are also consumed fresh in many Southeast Asian countries, including Thailand. However, research on the biological activities of PE is limited. Objective: This study aimed to measure the total phenolic and flavonoid contents and to test the anti-tyrosinase and antioxidant activities of PE extracts. The Folin-Ciocalteu colorimetric, the Aluminium chloride colorimetric, the DPPH scavenging, and the Dopachrome assays were used for the experiments. Results: The dichloromethane extract had the highest anti-tyrosinase activity (IC50= 2.08 {\textpm} 0.40 mg/mL), total flavonoid content (9.93 {\textpm} 0.02 mg QE/g extract), and antioxidant activity (IC50= 40 {\textpm} 0.02 μg/mL). The largest total phenolic concentration was found in the 80\% ethanol extract, albeit (11.97 {\textpm} 0.55 mg GAE/g extract). Conclusion: Based on its remarkable activities, the dichloromethane extract is recommended for future development in skinlightening products. The study{\textquoteright}s findings conclude that PE extracts may be used as an alternate source of antioxidants and anti-tyrosinase agents

}, keywords = {Anti-tyrosinase, Free radical scavenging., Pachyrhizus erosus, total flavonoid content, total phenolic content}, doi = {10.5530/pj.2023.15.160}, author = {Pornpun Laovachirasuwan and Methin Phadungkit} } @article {1115, title = {Anti-Elastase, Anti-Tyrosinase and Anti-Oxidant of Rubus Fraxinifolius Stem Methanolic Extract}, journal = {Pharmacognosy Journal}, volume = {12}, year = {2020}, month = {March 2020}, pages = {271-275}, type = {Original Article}, chapter = {271}, abstract = {

Introduction: Some Rubus were reported had anti-skin aging activity. Rubus fraxinifolius was one of Rubus genus which lives in Indonesian highland. Objective: This study was to examine elastase, tyrosinase, and oxidant inhibitory activity of R. fraxinifolius stem (RFS) extract. Methods: Extraction was done by a Soxhlet apparatus using methanol as solvent. Elastase inhibition activity was determined, which based on the formation of p-nitroaniline. Tyrosinase inhibition activity evaluated based on inhibition of mushroom tyrosinase by the sample with L-DOPA as substrate. The activity of antioxidant was determined using the DPPH radical scavenger method. LC-MS was used for prediction of naturally occurring phytochemicals. Results: The RFS extract yield was 9.03 \%. The RFS extract revealed inhibition activity against elastase and tyrosinase with IC50 128.85 ppm, and 155.19 ppm, respectively. DPPH radical scavenging activity gave IC50 63.04 ppm. Total phenolic content of the extract was 387.99+3.21 mg GAE/g extract. The LC-MS analysis showed the presence of at least 13 different organic compounds in RFS extract, which might contribute to the bioactivity. Conclusion: Therefore, this experiment further proved that RFS extract might be useful as a natural product ingredient of anti-photoaging skincare products because of its ability to inhibit elastase, tyrosinase, and as an antioxidant.

}, keywords = {Anti-Elastase, Anti-tyrosinase, Antioxidant, Rubus fraxinifolius stem}, doi = {10.5530/pj.2020.12.42}, author = {Yesi Desmiaty and Fadlina Chany Saputri and Muhammad Hanafi and Rini Prastiwi and Berna Elya} } @article {1189, title = {Phytochemicals, Antioxidants and Anti-tyrosinase Analyses of Selected Ginger Plants}, journal = {Pharmacognosy Journal}, volume = {12}, year = {2020}, month = {June 2020}, pages = {872-883}, type = {Research Article}, chapter = {872}, abstract = {

Background: Some of Zingeberaceae are not widely used for medicine of food, although in Thailand have been used them for many reasons about health or the diet. This study evalued the phytochemicals and anti-tyrosinase activities of 16 plant species of Alpinia, Amomum, Curcuma, Etlingera and Kaemferia (Zingiberaceae). Methods: The extractions of dried powdered rhizomes were performed using n-hexane, ethylacetate and ethanol. Percentage extract yield of the samples varied among species and solvent extracts. Chemical groups (alkaloids, flavonoids, tannins, polyphenols, steroids and terpenoids) were identified using phytochemical screening. The total phenolic contents (TPC) were analyzed using the Folin-Ciocalteu{\textquoteright}s reagent, while antioxidant activities were detected using 2,2-diphenyl-1- picrylhydrazyl (DPPH) and the 2,2{\textquoteright}-azino-bis (3-ethylbenzothizoline-6-sulphonic acid) (ABTS.+). The anti-tyrosinase was expressed to the half maximal inhibitory concentration (IC50) value (mg/mL). Results: The ethyl acetate extract of Amomum showed the highest value of TPC. The strongest antioxidant activity were found in Amomum and Kaemferia extracts, while ethyl acetate and ethanol extracts of all samples have a better antioxidant properties than the n-hexane extracts. On the other hand, the n-hexane extracts have the highest anti-tyrosinase potential in all samples and of these, Curcuma extracts were the best group. Conclusion: Our research indicated that plants of the Zingiberaceae would be new sources of antioxidants and anti-tyrosinase for further natural product developments in cosmetics, food or nutraceuticals.

}, keywords = {ABTS assay, Anti-tyrosinase, DPPH assay, Phenolic content, Phytochemicals, Zingiberaceae}, doi = {10.5530/pj.2020.12.125}, author = {Apinya Rachkeeree and Kuttiga Kantadoung and Ratchadawan Puangpradub and Ratchuporn Suksathan} }