scholarly journals QCM-based assay designs for human serum albumin

2021 ◽  
Author(s):  
Wisnu Arfian A. Sudjarwo ◽  
Mathias Thomas Dobler ◽  
Peter A. Lieberzeit
Keyword(s):  
Human Serum Albumin ◽  
Serum Albumin ◽  
Human Serum ◽  
Limit Of Detection ◽  
Solid Phase ◽  
Polymer Nanoparticles ◽  
Dependent Manner ◽  
Imprinted Polymer ◽  
Limit Of Quantification ◽  
Concentration Dependent Manner

AbstractSolid-phase synthesis is an elegant way to create molecularly imprinted polymer nanoparticles (nano-MIPs) comprising a single binding site, i.e. mimics of antibodies. When using human serum albumin (HSA) as the template, one achieves nano-MIPs with 53 ± 19 nm diameter, while non-imprinted polymer nanoparticles (nano-NIPs) reach 191 ± 96 nm. Fluorescence assays lead to Stern–Volmer plots revealing selective binding to HSA with selectivity factors of 1.2 compared to bovine serum albumin (BSA), 1.9 for lysozyme, and 4.1 for pepsin. Direct quartz crystal microbalance (QCM) assays confirm these results: nano-MIPs bind to HSA immobilized on QCM surfaces. This opens the way for competitive QCM-based assays for HSA: adding HSA to nanoparticle solutions indeed reduces binding to the QCM surfaces in a concentration-dependent manner. They achieve a limit of detection (LoD) of 80 nM and a limit of quantification (LoQ) of 244 nM. Furthermore, the assay shows recovery rates around 100% for HSA even in the presence of competing analytes.

Haemolytic activity of polyamidoamine dendrimers and the protective role of human serum albumin

2009 ◽  
Vol 466 (2117) ◽  
pp. 1527-1534 ◽  
Author(s):  
Barbara Klajnert ◽  
Sylwia Pikala ◽  
Maria Bryszewska
Keyword(s):  
Human Serum Albumin ◽  
Serum Albumin ◽  
Human Serum ◽  
Protective Role ◽  
Haemolytic Activity ◽  
Dependent Manner ◽  
Concentration Dependent Manner ◽  
Polyamidoamine Dendrimers

We have examined the haemolytic activity of polyamidoamine dendrimers. Haemolysis increased in a generation- and concentration-dependent manner. Moreover, the longer the incubation time, the greater the amount of haemoglobin released. When human serum albumin (HSA) was present in the incubation buffer, the extent of haemolysis decreased. This protective effect may be due to the high affinity of dendrimers for proteins: dendrimers that interact with HSA are unable to disrupt the membrane to the same extent as free dendrimers. The presence of HSA makes the buffer more relevant to physiological conditions. The results of this study suggest that the actual haemotoxicity of dendrimers in vivo is lower than is observed in vitro .

Calcium/Copper alginate framework doped with CuO nano-particles as a novel adsorbent for micro-extraction of benzodiazepines from human serum

2020 ◽  
Vol 16 ◽  
Author(s):  
Nadereh Rahbar ◽  
Fatemeh Ahmadi ◽  
Zahra Ramezani ◽  
Masoumeh Nourani
Keyword(s):  
Human Serum ◽  
High Performance ◽  
Limit Of Detection ◽  
Solid Phase ◽  
Nano Particles ◽  
Limit Of Quantification ◽  
Analytical Methodology ◽  
Fiber Fabrication ◽  
Relative Standard ◽  
Green Procedure

Background: Sample preparation is one of the most challenging phases in pharmaceutical analysis, especially in biological matrices, affecting the whole analytical methodology. Objective: In this study, a new Ca(II)/Cu(II)/alginate/CuO nanoparticles hydrogel fiber (CCACHF) was synthesized through a simple, green procedure and applied for fiber micro solid phase extraction (FMSPE) of diazepam (DIZ) and oxazepam (OXZ) as model drugs prior to high-performance liquid chromatography-UV detection (HPLC-UV). Methods: Composition and morphology of the prepared fiber were characterized and the effect of main parameters on the fiber fabrication and extraction efficiency have been studied and optimized. Results: In optimal conditions, calibration curves were linear ranging between 0.1–500 µg L−1 with regression coefficients of 0.9938 and 0.9968. Limit of detection (LOD) (S/N=3) and limit of quantification (LOQ) (S/N=10) of the technique for DIZ and OXZ were 0.03 to 0.1 µg L−1. Within-day and between-day relative standard deviations (RSDs) for DIZ and OXZ were 6.0–12.5% and 3.3–9.4%, respectively. Conclusion: The fabricated adsorbent has been substantially employed to extraction of selected benzo-diazepines (BZDs) from human serum real specimens and the obtained recoveries were also satisfactory (82.1-109.7%).

Solid-phase luminescent catalyst immunoassay for human serum albumin with hemin as labeling catalyst

1984 ◽  
Vol 156 ◽  
pp. 245-252 ◽  
Author(s):  
Yoshihito Ikariyama ◽  
Shuichi Suzuki ◽  
Masuo Aizawa
Keyword(s):  
Human Serum Albumin ◽  
Serum Albumin ◽  
Human Serum ◽  
Solid Phase

Rapid, competitive enzymoimmunoassay for albumin in urine.

1986 ◽  
Vol 32 (4) ◽  
pp. 669-671 ◽  
Author(s):  
J Chesham ◽  
S W Anderton ◽  
C F Kingdon
Keyword(s):  
Diabetic Nephropathy ◽  
Human Serum Albumin ◽  
Horseradish Peroxidase ◽  
Serum Albumin ◽  
Human Serum ◽  
Human Urine ◽  
Solid Phase ◽  
Low Concentrations ◽  
Initiation Of Therapy ◽  
Assay Protocol

Abstract In this solid-phase competitive enzymoimmunoassay for albumin in human urine, antiserum to human serum albumin labeled with horseradish peroxidase (EC 1.11.1.7) is incubated with solid-phase-bound human serum albumin in the presence of sample or standard. Results obtained correlate well (r = 0.96) with those of an established fluoroimmunoassay. The present assay covers the range 0.9 to 200 mg/L and can be performed within 1 h. These characteristics, together with the simplicity of the assay protocol, make it very useful for monitoring low concentrations of albumin in urine. Detection of such minimal albuminuria allows initiation of therapy that may prevent development of clinical proteinuria and associated diabetic nephropathy.

Sign in / Sign up

Export Citation Format

Share Document