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Since 2006, Ficus dubia has been reported as a new Ficus species in Thailand. As per our recent report, the red-brown aqueous extract of F. dubia sap (FDS) has been determined to strongly exhibit in vitro anti-radicals. However, the phytochemicals in the FDS extract related to health-promoting antioxidation have not been explored. Thus, in this study, we aimed to investigate the chemical components of the F. dubia sap extract by liquid chromatography-electrospray ionization quadrupole time-of-flight mass spectrometry (LC–ESI–MS/QTOF-MS) and its potential use in cosmetics in terms of cellular antioxidation on keratinocytes (HaCaT), phototoxicity, and irritation on 3D skin cell models following standard tests suggested by the Organization for Economic Cooperation and Development (OECD). It was found that the sap extract was composed of quinic acid and caffeoyl derivatives (e.g., syringoylquinic acid, 3-O-caffeoylquinic acid, 4-O-caffeoylquinic acid, and dimeric forms of caffeoylquinic acids). The extract has significantly exhibited antioxidant activity against H2O2-induced oxidative stress in HaCaT cells. The cellular antioxidative effect of the FDS extract was remarkably dependent on the presence of 3- and 4-O-caffeoylquinic acid in the extract. Furthermore, the FDS extract showed negative results on skin phototoxicity and irritation. Overall, the results reveal that the FDS extract could be developed as a new antioxidant candidate for a skin healthcare product.

Ethnopharmacological relevance Chiang-Da, Gymnema inodorum (Lour.) Decne. (GI), is an ethnomedicinal plant that has been used for diabetic treatment since ancient times. One of the anti-diabetic mechanisms is possibly related to the actions of triterpene glycoside, (3β, 16β)-16,28-dihydroxyolean-12-en-3-yl-O-β-D-glucopyranosyl-β-D-glucopyranosiduronic acid (GIA1) in decreasing carbohydrate digestive enzymes and intestinal glucose absorption in the gut system. Aims of the study To observe the amount of GIA1 in GI leaf extracts obtained from different ethanol concentrations and to investigate the anti-hyperglycemic mechanisms of the extracts and GIA1. Materials and methods The crude extracts were prepared using 50%v/v to 95%v/v ethanol solutions and used for GIA1 isolation. The anti-hyperglycemic models included in our study examined the inhibitory activities of α-amylase/α-glucosidase and intestinal glucose absorption related to sodium glucose cotransporter type 1 (SGLT1) using Caco-2 cells. Results GIA1 was found about 8%w/w to 18%w/w in the GI extract depending on ethanol concentrations. The GI extracts and GIA1 showed less inhibitory activities on α-amylase. The extracts from 75%v/v and 95%v/v ethanol and GIA1 significantly delayed the glycemic absorption by lowering α-glucosidase activity and glucose transportation of SGLT1. However, the 50%v/v ethanolic extract markedly decreased the α-glucosidase activity than the SGLT1 function. Conclusion Differences in the GIA1 contents and anti-glycemic properties of the GI leaf extract was dependent on ethanol concentrations. Furthermore, the inhibitory effects of the 75%v/v and 95%v/v ethanolic extracts on α-glucosidase and SGLT1 were relevant to GIA1 content.

Background: Derris scandens (DS) has been used in Thai traditional medicine recipes for musculoskeletal pain relief in Southern Thailand. Changing of terrain and climate affected its phytochemical constituents and led to change antioxidant and toxic properties. Objective: The aim of this study was to study phytochemical contents, antioxidant properties, and toxicity of the DS extracts' in vitro models. Materials and Methods: The DS ethanolic extract (EE) was partially extracted with chloroform (CE), ethyl acetate (EAE), and water (aqueous extract [AE]). Phytochemical contents, antioxidant properties, and toxicity in Caco-2 cells, peripheral blood mononuclear cells (PBMCs), and red blood cells (RBCs) were explored. Results: Genistein and gallic acid were rich in the EE and CE. The CE demonstrated the highest 2,2 − diphenyl − 1 − picrylhydrazyl scavenging activity with half-maximal Radical cavenging concentration (SC50) value – 0.81 ± 0.07 mg/mL. The EE showed the highest 2, 2'−azino − bis (3 − ethylbenzothiazoline − 6 − sulfonic acid) radical scavenging activity (SC50 = 22.05 ± 3.91 μg/mL) and all the extracts strongly inhibited lipid peroxidation. The EE and CE were more toxic than the EAE on Caco-2 cells with IC50 values – 26.45 ± 3.57 and 36.36 ± 6.87 μg/mL, respectively. At high dose, all fractions were not toxic to human's PBMCs, but they slightly induced RBC hemolysis by 3-6 percent. Conclusions: The DS grown in Southern Thailand had antioxidant properties, toxic to Caco-2 cells and not toxic to normal cells. High dose and continuous consumption of the DS must be concerned. Further safety assessment models including animals and humans should be performed to find safety dose of the DS. Abbreviations Used: ABTS: 2, 2-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid), DMEM: Dulbecco's Modified Eagle Medium, DMSO: Dimethyl sulfoxide, DPPH: 2,2-diphenyl-1-picrylhydrazyl, HLM: Human liver microsome, HLM: Human liver microsome, HPLC: High-performance liquid chromatography, IC50: Half inhibitory concentration, MDA: Malondialdehyde, OD: Optical density, PBMC: Peripheral blood mononuclear cell, RBC: Red blood cell, RPMI: Roswell Park Memorial Institute Medium, SC50: Halfmaximal radical scavenging concentration, SRB: Sulforhodamine B assay.