Preparation of HRP Molecularly Imprinted Electrochemical Sensor with Multi-walled Carbon Nanotubes as Sensitizing Materials and the Detection of H2O2
CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE
Authors: Teng Yu; Yang Shaoming; Bai Chaopeng; Zhang Jian
Abstract
Firstly, the pre-carboxylated multi-walled carbon nanotubes (MWCNTs) were electrodeposited on the surface of the glassy carbon electrode as sensitivity-enhanced materials. Then, a layer of polymeric film was formed on the modified electrode through the electropolymerization in the o-phenylenediamine (o-PD) monomer solution containing horseradish peroxidase template molecule. After removing the templates, the molecularly imprinted polymer membrane with specific recognition ability towards horseradish peroxidase was formed. The prepared molecularly imprinted electrochemical sensor had a good linear relationship with horseradish peroxidase ( HRP) in the concentration range of 1. 0 x 10(-10) -1. 0 x 10(-5 )mg/mL the correlation coefficient was 0. 991, and the detection limit was 1. 5x 10(-11) mg/mL,(S/N= 3); and also exhibited a good linear response for H2O, in the concentration range of 4. 0 x 10(-7)-1. 4 x 10(-5) mol/L, with a correlation coefficient of 0. 992 and a detection limit of 2. 6x 10( -7) mol/L (S/N = 3). And this molecularly imprinted sensor was used for the detection of the actual sample, the recovery rate is between 91. 2% and 97. 1%. HRP and H2O2 bi-analyte sensor based on MIP film was successfully developed in this work. The developed method can also be applicable 14 enzyme and its enzymatic substrate bi-analyte sensor.
A Preliminary Randomized Controlled Evaluation of a Universal Healthy Relationships Promotion Program for Youth
CANADIAN JOURNAL OF SCHOOL PSYCHOLOGY
Authors: Exner-Cortens, Deinera; Wolfe, David; Crooks, Claire, V; Chiodo, Debbie
Abstract
Bullying and mental health problems are pressing concerns for adolescents. Given their burden, we need to find efficacious ways to prevent these experiences. However, existing prevention programs tend to be single-issue and may not focus on the universal capacities required to reduce these problems among youth. To this end, we evaluated the universal, small groups Healthy Relationships Plus (HRP) program, which focuses on the promotion of positive mental health and the reduction of bullying and substance misuse. A sample of 212 youth from Southwestern Ontario were randomly assigned to the HRP or an attention-control condition over an 8-day period during summer 2014. Primary outcome measures (i.e., most important outcomes for this evaluation) were positive mental health, bullying victimization/perpetration, and substance misuse (alcohol, marijuana). We also examined a mediator (help-seeking) and two moderators (sex, adverse childhood experiences) of main effects. Participation in HRP was associated with reduced odds of physical bullying victimization at 1-year follow-up, compared with adolescents in the attention-control condition. This finding was mediated by increased intention to seek help from a mental health professional following HRP participation. We did not find main effects for positive mental health or substance misuse in this sample; however, there was an interaction effect whereby youth with significant trauma experiences reported less marijuana use at 1-year follow-up compared with control students. Findings reiterate the importance of help-seeking for bullying prevention and demonstrate the preliminary efficacy of the HRP as a universal strategy for preventing bullying victimization among mid-adolescents within school and community settings.