In this study, the influence of guelder rose (revealed potential toxic effects as well as decreased insulin secretion from MIN6 cells. of fruit was explained previously and includes chlorogenic acid, flavanols, and procyanidins [5,6,7]. Whereas the antioxidant potential Prasugrel (Maleic acid) of guelder rose constituents is definitely well characterized, its biological activity within the cellular model is not known very Prasugrel (Maleic acid) well. There are few studies exposing its anticancer properties against different cell lines, yet they match cytotoxicity with down-regulation of the cellular antioxidant defense system, mitochondria collapse, and cellular death induction [4,8,9,10,11,12]. Furthermore, actually less data indicate the cytoprotective activity of fruit may increase the antioxidant capacity of the body, and consequently counteract oxidative stress, we decided to investigate its influence on the prevention of obesity and type 2 diabetes. Our previous studies have identified potent antidiabetic activities of guelder rose as the inhibitor against -amylase, -glucosidase, and protein tyrosine phosphatase 1B (PTP1B) . Furthermore, the phenolic-rich portion (PRF) decreased free fatty acids and glucose uptake, as well as build up of lipid droplets in Caco-2 cells, exposing potential anti-obesity properties . Taking into account the pancreas is definitely involved in nutrient rate of metabolism rules and glucose homeostasis, we wanted to determine the influence of on -cells. We previously found pancreatic TC3 cells to have low level of antioxidant safety, which was supported by guelder rose phenolics activity . Here, the mouse insulinoma MIN6 cell collection was selected as the cellular model, which displays characteristics of pancreatic -cells insulin secretion in response to glucose along with other secretagogues [21,22]. Like a source of biologically active phenolic compounds, new juice (FJ) and the PRF from guelder rose juice were used. The recognized phenolic compounds and their quantities were described in detail previously , and chemical characteristics are briefly presented in Table 1. The phenolics Prasugrel (Maleic acid) content in FJ reached a value of 10.32 mg/g in preparation, but sugars, proteins, organic acids, along with other mineral elements were also present. Purification of juice performed via solid-phase extraction on a Sep-Pac C18 column allowed Prasugrel (Maleic acid) us to obtain the PRF, where phenolics reached 827.00 mg/g in preparation. As data shown (Table 1), the juice purification process resulted in an 80-fold increase in the concentration of phenolic compounds. In the tested samples there were 10 major phenolics detected. As the main phenolic compound in both components, the chlorogenic acid amount in FJ was equal to 8 mg/g in preparation, whereas in PRF it reached 645 mg/g. Quantitatively, flavanols were the second most prominent component of the preparations with (+)-catechin as the main chemical. Both components also contained procyanidins B1 and B2. Among anthocyanins, different cyanidin glycosides have been recognized with cyanidin 3-sambubioside as the main pigment. Flavonols occurred at the lowest concentration in the extracts. Due to low concentrations, neochlorogenic acid and quercetin were recognized only in the PRF. Table 1 Individual phenolic compounds in fruit samples . phenolic components against oxidative stress induced by a powerful pro-oxidant chemically, L. fruit had been used (accounts number 18162), that have been extracted from Rogw Arboretum, Warsaw School of Lifestyle Sciences (Rogw, Poland). After fruits homogenization and centrifuging (5000 rpm for 10 min) FJ was attained. FJ purification by solid-phase removal with C-18 Sep-Pak cartridge (10 g capability, Waters Corp., Milford, MA, USA; 12-Interface Vacuum Manifold program) and methanolic elution procedures permitted to isolate PRF. To execute natural activity assays a share option of PRF at ILK focus 100 mg/mL in 50% dimethyl sulfoxide (DMSO) was ready. Identified phenolic substances.