AN INSIGHT INTO IN VITRO BIOACTIVITY OF WILD-GROWING PUFFBALL SPECIES LYCOPERDON PERLATUM (PERS) 1796

ABSTRACT: Lycoperdon perlatum (Pers) 1796 is saprobic puffball species with a global distribution. It is edible if young, when the gleba is still homogeneous and white. Since this species has a pleasant texture and taste, it has been used in soups as a substitute for dumplings. The aim of this work was to study bioactivity of crude extracts prepared from wild-growing sporocarps of L. perlatum collected from Eastern Serbia during 2012. The bioactivity screens included antioxidant (DPPH • and FRAP assays), antiproliferative (human breast MCF-7 cancer cell-line; MTT and SRB assays) and antibacterial (three referent ATCC strains; microdilution assay) effects. Polar extracts (aqueous -LycAq and ethanol -LycEtOH) and a nonpolar extract (hexane -LycHex) of the examined mushroom species were screened. In addition, LycAq and LycEtOH were primarily characterized by UV-VIS spectrophotometry, due to determination of chemical composition (total phenol and flavonoid contents). The highest anti-DPPH radical activity was observed for LycAq (IC 50 = 46.56 µg/ml). In comparison with LycAq, less polar LycEtOH showed slightly better ferric reducing antioxidant power (FRAP) (IC 50 = 21.87 µg/ml and IC 50 = 19.28 µg/ml, respectively). However, total phenol contents of both extracts were similar (≈ 2.0 mg GAE/g d.w.). Conversely, modest activities were found against Staphylococcus aureus ATCC 25922 (LycHex, MIC = 3.12 mg/ml) and MCF-7 cells (with the highest one obtained for LycEtOH after 72 h, IC 50 = 367.54 µg/ml and IC 50 = 390.03 µg/ml, MTT and SRB assays, respectively). According to the obtained experimental data, L. perlatum can be considered as a good source of novel and potent natural antioxidants for use in regular diet

Edible mycorrhizal species Lactarius controversus Pers. 1800 as a source of antioxidant and cytotoxic agents

The aim of this work was to study chemical profile and antioxidant and cytotoxic activities of ethanol and water extracts of Lactarius controversus (Pers.) 1800 mushroom species growing in eastern Serbia. The chemical characterization of phenolic compounds performed by HPLC-MS/MS demonstrated the presence of quinic acid among others. Determination of antioxidant activity, including radical scavenging effects on DPPH•, NO•, OH• and SOA radicals and ferric reducing ability was investigated. The highest DPPH radical scavenging effect was obtained for water extract (LcAq) while ethanol extract (LcEtOH) demonstrated the highest FRAP activity. Hexane extract applied in antibacterial assay against three pathogenic strains demonstrated antibacterial effect only against S. aureus ATCC25922. Anti-proliferative properties against estrogen dependent MCF 7 breast cancer cell lines using MTT showed higher activity for ethanolic extract. [Projekat Ministarstva nauke Republike Srbije, br. III 46001 i br. 172058

Protective intraoperative ventilation with higher versus lower levels of positive end-expiratory pressure in obese patients (PROBESE): Study protocol for a randomized controlled trial

Background: Postoperative pulmonary complications (PPCs) increase the morbidity and mortality of surgery in obese patients. High levels of positive end-expiratory pressure (PEEP) with lung recruitment maneuvers may improve intraoperative respiratory function, but they can also compromise hemodynamics, and the effects on PPCs are uncertain. We hypothesized that intraoperative mechanical ventilation using high PEEP with periodic recruitment maneuvers, as compared with low PEEP without recruitment maneuvers, prevents PPCs in obese patients. Methods/design: The PRotective Ventilation with Higher versus Lower PEEP during General Anesthesia for Surgery in OBESE Patients (PROBESE) study is a multicenter, two-arm, international randomized controlled trial. In total, 2013 obese patients with body mass index ≥35 kg/m2 scheduled for at least 2 h of surgery under general anesthesia and at intermediate to high risk for PPCs will be included. Patients are ventilated intraoperatively with a low tidal volume of 7 ml/kg (predicted body weight) and randomly assigned to PEEP of 12 cmH2O with lung recruitment maneuvers (high PEEP) or PEEP of 4 cmH2O without recruitment maneuvers (low PEEP). The occurrence of PPCs will be recorded as collapsed composite of single adverse pulmonary events and represents the primary endpoint. Discussion: To our knowledge, the PROBESE trial is the first multicenter, international randomized controlled trial to compare the effects of two different levels of intraoperative PEEP during protective low tidal volume ventilation on PPCs in obese patients. The results of the PROBESE trial will support anesthesiologists in their decision to choose a certain PEEP level during general anesthesia for surgery in obese patients in an attempt to prevent PPCs. Trial registration: ClinicalTrials.gov identifier: NCT02148692. Registered on 23 May 2014; last updated 7 June 2016

Protective intraoperative ventilation with higher versus lower levels of positive end-expiratory pressure in obese patients (PROBESE): study protocol for a randomized controlled trial

Background: Postoperative pulmonary complications (PPCs) increase the morbidity and mortality of surgery in obese patients. High levels of positive end-expiratory pressure (PEEP) with lung recruitment maneuvers may improve intraoperative respiratory function, but they can also compromise hemodynamics, and the effects on PPCs are uncertain. We hypothesized that intraoperative mechanical ventilation using high PEEP with periodic recruitment maneuvers, as compared with low PEEP without recruitment maneuvers, prevents PPCs in obese patients.Methods/design: The PRotective Ventilation with Higher versus Lower PEEP during General Anesthesia for Surgery in OBESE Patients (PROBESE) study is a multicenter, two-arm, international randomized controlled trial. In total, 2013 obese patients with body mass index >= 35 kg/m(2) scheduled for at least 2 h of surgery under general anesthesia and at intermediate to high risk for PPCs will be included. Patients are ventilated intraoperatively with a low tidal volume of 7 ml/kg (predicted body weight) and randomly assigned to PEEP of 12 cmH(2)O with lung recruitment maneuvers (high PEEP) or PEEP of 4 cmH(2)O without recruitment maneuvers (low PEEP). The occurrence of PPCs will be recorded as collapsed composite of single adverse pulmonary events and represents the primary endpoint.Discussion: To our knowledge, the PROBESE trial is the first multicenter, international randomized controlled trial to compare the effects of two different levels of intraoperative PEEP during protective low tidal volume ventilation on PPCs in obese patients. The results of the PROBESE trial will support anesthesiologists in their decision to choose a certain PEEP level during general anesthesia for surgery in obese patients in an attempt to prevent PPCs