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Commentary - (2022) Volume 8, Issue 3

A note on the Optical Biosensor for Monitoring Antigen Recognition

1Department of Chemistry, Jilin University, Changchun, Jilin 130023, P.R. China
*Correspondence: Qinhan Jin, Department of Chemistry, Jilin University, Changchun, Jilin 130023, P.R. China, Tel: +86 431-8922161, Email:

Received: 02-May-2022, Manuscript No. Ipmedt-22-13011; Editor assigned: 03-May-2022, Pre QC No. Ipmedt-22-13011 (PQ); Reviewed: 16-May-2022, QC No. Ipmedt-22-13011; Revised: 23-May-2022, Manuscript No. Ipmedt-22-13011 (R); Published: 30-May-2022


The sensor is designed on the basis of fixing angle of incidence and measuring the reflected intensities of light in the wavelength range of 400–800 nm. The SPR spectra are shown in terms of reflected light intensity verus wavelength of incident light. The intensity of the reflected light is the minimum at the resonant wavelength. The bio recognition surface, formed on a chemically modified gold layer, consists of avidin that is specifically bound with biotin. These sensing membranes were self-assembled on gold layer. The modified surface was used as a model immunosensor and to detect successfully the human factor B (Bf). The Bf was determined in the concentration range of 0.5~100 μg/mL. Under optimum experimental conditions, the sensor has a good repeatability, reversibility and selectivity.


Plasmon; Immunosensor; Biosensor; Avidin; Biotin; Prism.


Surface plasmon resonance (SPR) sensing element could be a helpful analytical tool for finding out the biomolecular recognition at surfaces as a result of it is wont to monitor interactions between proteins and immobilized ligands in real time. Associate in Nursing temporary field is generated as light-weight propagate with total internal reflection at the interface between glass and metal film, inducement the generation of surface plasmon from the free electrons within the metal film. The temporary field from the glass-metal interface penetrates into the metal film and propagates with exponentially ablated amplitudes [1]. Surface plasmon, that oscillates and propagates on the side of the metal film, absorbs a number of the optical phenomenon light-weight energy from the temporary field, reduces the totalinternal- reflection intensity level. the precise location of the dip minimum (resonant angle or resonant wavelength) is determined by sleuthing the amendment of the angle or wavelength. The binding of molecules being studied on the lower metal surface causes a amendment in index of refraction of the surface medium that, in turn, will cause a shift of resonant angle or wavelength and therefore is used for determination of the species being studied [2]. The sensing principle of most business SPR devices is predicated on fixing a distinct excitation wavelength and modulating the angle of incident light-weight, therefore, the SPR mirrored spectra were shown as a perform of the angle of incident light-weight. In apply, the mode of operation is to use a large machinery-rotating shelf. It makes use of a coupling prism coated with a skinny gold film and performs the sensing by variable the angle with a direction finder. The SPR wavelength of mixture gold particles coated with a protein(antibody) was shown to be redshifted once the antibody interacted with its specific matter to supply a amendment within the index of refraction. However, rather than using a set wavelength and modulated the angle of sunshine, the incident angle is fastened and therefore the excitation wavelength modulated. A grouping W lamp was used because the light and a charge coupled device (CCD) detector was used for observation the complete wavelength vary of 400- 800 nm, at the same time.


The robust and specific noncovalent interaction between vitamin H|vitamin B complex|vitamin B|B vitamin|B} (vitamin H) and therefore the egg-white macromolecule|compound protein} avidin (MW sixty eight 000) or the nonglycosylated protein streptavidin (MW sixty 000) results in the formation of a high-affinity complex (Ka is concerning 10-15 M) [3]. the sunshine supply could be a grouping W lamp in conjunction with a continuing voltage electrical device. {the light-weight|the sunshine} from this supply passes through a polarizer and becomes atomic number 69 polarized light. so as to form the sunshine be parallel one, 2 lenses square measure utilized. The focal lengths of lens one and lens two square measure thirty millimetre and therefore the operating distance from lens one to lens two is sixty millimetre. The exit light-weight from the prism is radio-controlled into the glass fibre so to the Fullwave photometer. The incident angle is fastened at an acceptable price to make sure the surface plasmon resonance development to occur. The mirrored intensity level is that the minimum at the resonant wavelength [4]. A smaller increase in index of refraction of the analyzed answer would cause a transparent shift in SPR mirrored spectra towards longer resonant wavelength. The gold surface of the prism was exposed to five mmol/L DDA for one hour, followed by water removal. 0.25 mil of a hundred mg/mL EDC answer and zero.25 mil of a hundred mg/mL NHS answer were mixed, so were injected into the flow cell. This answer was allowed to move with the DDA for one hour. The surface was then rinsed with water Associate in Nursingd immersed in an liquid zero.2 mg/mL avidin answer for a minimum of one hour, when that the surface was rinsed with water once more. A PBS answer containing five-hitter bovine albumin (BSA) was wont to block the nonspecific binding sites. Then a two μg/mL biotinlated anti-rabbit IgG PBS answer was injected into the flow cell and unbroken to immerse the sensing membrane for forty min. when the biotinlated anti-rabbit IgG monolayer was fashioned, 2 mL of 0.01 mol/L PBS (pH=7.4) was wont to take away the unbound protein for many times. The –NH2 cluster of avidin will simply exchange with the –NHS of the sensing element surface. The surface assimilation curve of avidin (from zero.2 mg/mL liquid solution) on the surface of sensing element was shown in Figure two(a). the most shift of the resonant wavelength was four 5 nm and turning into stable in ten min. so as to form the avidin monolayer well ordered and stable, the sensing element surface was immersed in avidin answer for sixty min, then it had been rinsed with pure water for many times. Bf is a vital complement substance of complement three (C3), that plays an important role within the activation of the choice pathway of C3 on the surface of biomaterials throughout extra-corporeal procedures. The content of Bf is expounded with polygenic disorder, high blood pressure, and so on. so as to discover human Bf, a rabbit anti-human Bf blood serum was injected into the flow cell of the SPR sensing element. The protein collecting was monitored once more in real time [5].The antigen-antibody complicated is eluted from the avidin-biotin surface among ten minutes. use caution ne'er to let the samples keep within the flow cell for while as a result of it'll build the complicated tough to be rinsed and waste the sensing element membrane



Conflict of interest

No conflict of interest


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Citation: Jin Q (2021) A note on the Optical Biosensor for Monitoring Antigen Recognition . Mol Enzy Drug Targ, Vol.8 No. 3: 102.