Rabbit Anti-HBsAg (subtypes ad & ay) Polyclonal antibody

A simple model is designed for an inductive immunosensor in which the magnetic particles are attached to the bioreceptors to form a sandwich on the surface of an inductor. The inductor consists of a coil covered on a silicon oxide wafer. The coil comprises 250 turns of a planar gold wire, which is approximately 200 nm thick and 392 mm long, placed in a circle with a diameter of 2 mm. The model is well characterised by controlling the geometrical and electrical parameters and also the permeability of the magnetic material. To evaluate the feasibility of the model for virus monitoring, a novel inductive immunosensor is designed and for the first time applied for the detection of hepatitis B surface antigen (HBsAg). At first, Fab ' segment of primary anti-HBsAg is immobilised on the coil. Then, the coil is exposed to HBsAg and the complex is introduced to a secondary antibody conjugated with magnetic particles to form an immune-sandwich. Finally, the influence of magnetic particles on the coil inductance is recorded and used as a signal for HBsAg detection. The magnetic inductive immunosensor showed specific responses toward HBsAg with the detection limit of 1 ng mL(-1), linear range of 1 to 200 ng mL(-1), and a sensitivity of 6 x 10(-4) mL ng(-1). The experimental results showed a very good agreement with simulation data indicating the compatibility of sensor sensitivity to the expected theoretical values.

Background Chronic hepatitis B virus (HBV) infection is a great health burden with geographical variations. Aims To explore genetic variants associated with chronic HBV infection. Methods The study included 15 352 participants seropositive for HBV core antibodies in Taiwan Biobank. Among them, 2591 (16.9%) seropositive for HBV surface antigen (HBsAg) were defined as chronic HBV infection. All participants were examined for whole-genome genotyping by Axiom-Taiwan Biobank Array. The human leucocyte antigen (HLA)imputation was performed after identification of the variants within the region. Logistic regressions were used to estimate odds ratios (ORs) with 95% confidence intervals. Correlations of differentHLAallele frequencies with HBsAg seroprevalence were evaluated across worldwide populations by Pearson correlation coefficients. Epitope prediction was performed forHLAalleles using NetMHCIIpan method. Results Located within a cluster of 450 single nucleotide polymorphisms inHLAclass II, rs7770370 (P = 2.73 x 10(-35)) was significantly associated with HBV chronicity (P-corrected < 8.6 x 10(-8)). Imputation analyses showed thatHLA-DPA1*02:02andHLA-DPB1*05:01were associated with chronic HBV, with adjusted ORs of 1.43 (1.09-1.89) and 1.61 (1.29-2.01). These allele frequencies were positively correlated with global HBsAg seroprevalence, with R of 0.75 and 0.62 respectively (P < 0.05).HLA-DRB1*13:02,HLA-DQA1* 01:02andHLA-DQB1*06:09associated with HBV chronicity negatively, with adjusted ORs of 0.31 (0.17-0.58), 0.70 (0.56-0.87) and 0.33 (0.18-0.63). TheseHLAalleles had various binding affinities to the predicted epitopes derived from HBV nucleocapsid protein. Conclusions HLAclass II variants are relevant for chronicity after HBV acquisition.