Key lime or Citrus aurantifolia has been well known for its functions, either as food or medicine. This fruit has a greenish-yellow color with a sour and bitter taste and distributed initially from East Asia. This review summarizes the phytochemical screening, therapeutic effects, and adverse effects of key lime. Most parts of the plant contain phytochemicals, such as phenols, flavonoids, steroids, terpenoids, and alkaloids, with other varying compounds like saponin, tannin, anthraquinone, glycosides, and carbohydrates that may be due to the country where the plant is grown, or the extraction methods. Some studies have been conducted to evaluate the therapeutic effects of key lime, including antibacterial, antioxidant, anticancer or antitumor, anti-cholesterol, anti-larvae, anti-mosquito, antidiabetic, anti-inflammatory, and anticholinesterase. Key lime also may cause some adverse effects, such as phytophotodermatitis. It may lead to toxicity manifested in conditions such as edema, inflammation, or necrosis in some organs in the body, an increase in lymphocytes & liver enzymes, and a decrease in hemoglobin.

Orthosiphon aristatus has been known for its medicinal uses. One of the compounds responsible for the pharmacological activities of O. aristatus is a flavonoid called Eupatorin (EUP). EUP has been studied for its pharmacological activities, including anti-inflammatory, vasodilating, antiproliferative, hepatoprotective, analgesic, and antidiabetic properties. Despite its importance and abundance, currently, there is no published paper that reviews the characteristics, pharmacological activities and isolation methods of EUP. This review summarizes the botanical origin, phytochemical characteristics, pharmacological activities, isolation, as well as identification and characterization methods of EUP from O. aristatus. This paper also compares different isolation methods based on the parameters and the resulting yields. Various isolation methods had been used to obtain EUP. Reverse-phase high-performance liquid chromatography (HPLC) is the most commonly used method to isolate EUP, followed by preparative thin layer chromatography (TLC) and crystallization for the purification. Various spectroscopic methods, including UV-Vis, FT-IR, Mass, and NMR spectroscopy have been commonly used to identify and characterize EUP. This paper provides a comprehensive insight into EUP from O. aristatus which might be beneficial for future research using this compound

Background: Blue light exposure has been shown to induce ROS generation and subsequent inflammatory pathways that lead to cell death, in which antioxidants could counteract this effect. Although regarded as waste, cocoa (Theobroma cacao L.) Pod Husk (CPH) possesses a high polyphenolic contents, which could serve as antioxidants. Objectives: To characterize CPH ethanolic extract based on its antioxidant capacity and observe the cytoprotective ability of CPH in vitro upon blue light exposure. Materials and Methods: CPH ethanolic extract was characterized through total phenolic content, total flavonoid content, and three antioxidant assays, then treated on HaCaT cells, in which cell viability was measured through MTS assay. Results: CPH extract showed high phenolic and flavonoid contents and high antioxidant capacity through DPPH and FRAP assay. CPH extract started to exert cytotoxicity from concentrations of 400 µg/mL and above, while 100 µg/mL and above in AA. Furthermore, CPH extract showed significant cytoprotective effect at 50 µg/mL at 11.92 ± 0.83% cell viability increase, wherein AA failed to protect HaCaT cells at the same concentration at 15.79 ± 0.72% cell viability decrease. Conclusion: CPH could serve as an alternative as blue light protection agent as it was safe to be used at higher concentrations and was able to protect HaCaT cells from blue light irradiation better than AA.