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IgG (H+L), Goat anti_Mouse; ELISA,WB

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[#YSRTSTAR167] IgG (H+L), Goat anti_Mouse; ELISA,WB


YSRTSTAR167 | IgG (H+L), Goat anti_Mouse; ELISA,WB, 1 mg.
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(1) Long-period gratings in photonic crystal fiber as an optofluidic label-free biosensor.[TOP]

Pubmed ID :21703845
Publication Date : //
Using long-period gratings (LPG) inscribed in photonic crystal fiber (PCF) and coupling this structure with an optically aligned flow cell, we have developed an optofluidic refractive index transduction platform for label-free biosensing. The LPG-PCF scheme possesses extremely high sensitivity to the change in refractive index induced by localized binding event in different solution media. A model immunoassay experiment was carried out inside the air channels of PCF by a series of surface modification steps in sequence that include adsorption of poly(allylamine hydrochloride) monolayer, immobilization of anti-rat bone sialoprotein monoclonal primary antibody, and binding interactions with non-specific goat anti-rabbit IgG (H+L) and specific secondary goat anti-mouse IgG (H+L) antibodies. These adsorption and binding events were monitored in situ using the LPG-PCF by measuring the shift of the core-to-cladding mode coupling resonance wavelength. Steady and significant resonance changes, about 0.75 nm per nanometer-thick adsorbed/bound bio-molecules, have been observed following the sequence of the surface events with monolayer sensitivity, suggesting the promising potential of LPG-PCF for biological sensing and evaluation.

Authors : He Zonghu, Tian Fei, Zhu Yinian, Lavlinskaia Nina, Du Henry,

(2) The immobilization of proteins on biodegradable polymer fibers via click chemistry.[TOP]

Pubmed ID :18035410
Publication Date : //
A facile and efficient method to immobilize bioactive proteins onto polymeric substrate was established. Testis-specific protease 50 (TSP50) was immobilized on ultrafine biodegradable polymer fibers, i.e., (1) to prepare a propargyl-containing polymer P(LA90-co-MPC10) by introducing propargyl group into a cyclic carbonate monomer (5-methyl-5-propargyloxycarbonyl-1,3-dioxan-2-one, MPC) and copolymerizing it with l-lactide; (2) to electrospin the functionalized polymer into ultrafine fibers; (3) to azidize the TSP50, and (4) to perform the click reaction between the propargyl groups on the fibers and the azido groups on the protein. The TSP50-immobilized fibers can resist non-specific protein adsorptions but preserve specific recognition and combination with anti-TSP50. ELISA tests were carried out by using HRP-goat-anti-mouse-IgG(H+L) as secondary antibody and o-phenylenediamine (OPDA)/H(2)O(2) as substrate to detect the combination of immobilized TSP50 with anti-TSP50. The results showed that anti-TSP50 can be selectively adsorbed from its solution onto the TSP50-immobilized fibers in the presence of BSA of as high as 10(4) times concentration. TSP50 immobilized on the fiber and anti-TSP50 combined to the fiber were also quantitatively determined. Anti-TSP50 can be then eluted off from the fiber when pH changes. The eluted fiber can re-combine anti-TSP50 at an efficiency of 75% compared to the original TSP50-immobilized fiber. Therefore, the TSP50-immobilized fibers can be used in the detection, separation, and purification of anti-TSP50. The "click" method can lead to a universal strategy to protein immobilization.

Authors : Shi Quan, Chen Xuesi, Lu Tiancheng, Jing Xiabin,

(3) Multiplex biosensor using gold nanorods.[TOP]

Pubmed ID :17222022
Publication Date : //
Gold nanorods (GNRs) with different aspect ratios were fabricated through seed-mediated growth and surface activation by alkanethiols for the attachment of antibodies to yield gold nanorod molecular probes (GNrMPs). Multiplex sensing was demonstrated by the distinct response of the plasmon spectra of the GNrMPs to binding events of three targets (goat anti-human IgG1 Fab, rabbit anti-mouse IgG1 Fab, rabbit anti-sheep IgG (H+L)). Plasmonic sensors are highly specific and sensitive and can be used to monitor refractive index changes caused by molecular interactions in their immediate vicinity with potential to achieve single-particle biosensing. This technique can play a key role in developing novel optical biosensors for both in vivo and in vitro detection and single-receptor kinetics.

Authors : Yu Chenxu, Irudayaraj Joseph,

(4) Enzyme immunoassay for carminic acid in foods.[TOP]

Pubmed ID :7756895
Publication Date : //
A competitive enzyme immunoassay (EIA) for carminic acid was investigated. Monoclonal anticarminic acid antibody was obtained from A/J mice immunized with carminic acid-human immunoglobulin G (IgG) conjugate. Carminic acid was extracted with distilled water from beverage, jelly, candy, pasta sauce, yogurt, or ice cream samples. Ham or fish paste samples were digested with pronase, then carminic acid was extracted from samples with sodium hydroxide solution. The extract was diluted more than 10-fold with 1% gelatin in borate buffer solution. Microtiter plates were coated with carminic acid-bovine serum albumin (BSA) conjugate or just BSA. Goat anti-mouse IgG(H+L)-peroxidase complex was used as a second antibody, and 3,3',5,5'-tetramethylbenzidine was used as a substrate for the peroxidase. The working range for quantitative analysis was 0.3-10 ng/mL, and the detection limit was 0.2 micrograms/g original sample. Recoveries of carminic acid by this assay were > 95% for milk beverage and jelly, and > 85% for yogurt and fish paste. Carminic acid was detected in 7 of 26 red-colored commercial food products and ranged from 3.5 to 356 micrograms/g. This EIA system also responded to the structural analogue of carminic acid, laccaic acid.

Authors : Yoshida A, Takagaki Y, Nishimune T,

(5) Immunoblot analysis of IgG subclass antibody response against Coxiella burnetii in Balb/c mice.[TOP]

Pubmed ID :1350177
Publication Date : //
Balb/c mice were inoculated with live or inactivated organisms of Coxiella burnetii, strain Nine Mile, phase I. Sera collected after different time intervals were subjected to immunoblot analysis and results compared with ELISA values. Immunoblots were performed with different horseradish peroxidase labelled conjugates (goat anti-mouse IgG1, IgG2a, IgG2b, IgG3) and results monitored and analysed by laser densitometry. ELISA analysis was performed using the same peroxidase labelled goat anti-mouse subclass antibody conjugates. In addition, goat anti-mouse IgG(H+L), IgG(H), IgM, and IgA conjugates were used for ELISA tests.

Authors : Thiele D, Willems H, Glas M,

(6) Enzyme immunoassay for hen egg white lysozyme used as a food additive.[TOP]

Pubmed ID :1874695
Publication Date : //
An indirect competitive enzyme immunoassay for hen egg white lysozyme (HEL) used as a food additive was investigated. Anti-HEL antibodies were obtained from B10A mouse ascites immunized by intraperitoneal injection of HEL. HEL samples to be assayed were extracted from foods with 1% gelatin in borate buffer. Goat anti-mouse IgG (H+L)-peroxidase complex was used as a second antibody, and 3,3',5,5'-tetramethylbenzidine was used as a substrate for the peroxidase. The working range for quantitative analysis was 1-50 ng/mL, because in this range the binding inhibition curve of anti-HEL antibodies to HEL-coated plates by HEL was linear. Even after losing the lysozyme activity by heat treatment, HEL could be detected by indirect competitive enzyme immunoassay. Recoveries of HEL by this assay were greater than 85% for Japanese noodles and Japanese traditional-style confectioneries, 53-95% for Miso and cooked beans, and 30-85% for fried fish pastes. HEL contents of 55 commercial foods were determined; HEL was detected in 19 samples in the range 25-20,000 ng/g. HEL as a food additive was detected more frequently in plant-derived foods than in foods of animal origin.

Authors : Yoshida A, Takagaki Y, Nishimune T,