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Chemiluminescence method

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The Chemiluminescence method is a technique used in analytical chemistry and biochemistry to detect and quantify various analytes, such as proteins, enzymes, and other biomolecules. The method relies on the emission of light during a chemical reaction, which can be measured and used to determine the concentration of the target analyte. This technique is widely used in a variety of applications, including immunoassays, gene expression analysis, and environmental monitoring.

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9 protocols using chemiluminescence method

1

Quantifying DARPP-32 Phosphorylation in Striatal Slices

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To evaluate the phosphorylation state of DARPP-32 in our experimental conditions, striatal slices were incubated with Roscovitine 20 μM or vehicle for 10 min in artificial brain fluid. After incubation, striatal tissue was homogenized in lysis buffer containing 26 mM Tris–HCl, 1% (v/v) Triton X-100, 1.3 M glycerol and 130 mM NaCl, with the protein phosphatase inhibitor cocktail Complete mini tab (Roche). The samples were recollected and centrifuged for 5 min at 4500 rpm; supernatants were recollected and store at −70°C. Protein quantification was made using the Bradford method and 80 μg of protein was loaded in 10% (w/v) PAGE for electrophoresis. Proteins were transferred to PVDF membranes and incubated with primary antibodies against pDARPP-32 Trh34 (1:1000), pDARPP-32 Trh75 (1:1000) and Actin (1:1000) for 12–20 h at 4°C, and with secondary antibodies (1:2000) with HRP for 2 h at room temperature. Protein detection was performed through the use of luminol with a chemiluminescence method (Millipore); images were acquired via a scan (HP Scanjet G2410) and analyzed with Image J software for the evaluation of densitometry.
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2

Protein Extraction and Western Blot

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Cells were lysed in cell lysis buffer (RIPA) with complete protease inhibitor cocktail (Roche, Pleasanton, CA, USA) and centrifuged at 120,000g at 4 °C for 15 min. The cytosolic fraction in the supernatant was collected. Protein extract was separated by SDS-PAGE, and then electronically transferred onto the PVDF membrane (Roche). After blocking, the membrane was incubated with indicated primary antibodies (Additional file 1: Table S1) at 4 °C for overnight. After washing, the membrane was incubated with secondary antibody. Subsequently, immunoblotting was performed using the chemiluminescence method (Millipore, Bedford, MA, USA), according to manufacturer’s instructions.
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3

Quantifying NF-κB p65 Expression in Endometrial Tissue

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Using RIPA lysis buffer [50 mM Tris-HCl (pH 7.6), 1% NP-40; sodium deoxycholate (0.5%), SDS (0.1%), PMSF, Aprotinin (1 mg/L), Leupeptin (1 mg/L)] the endometrial tissue sections were homogenized on ice and centrifuged. Total protein concentration in the supernatant was determined using BCA assay kit (BioRad, USA). For NF-κB (p65) expression analysis both in nuclear and cytosolic fractions, aliquot of the tissue homogenate was separated into fractions as per manufacturer's protocol using an NE-PER nuclear and cytoplasmic extraction reagents kit (Pierce Biotechnology, Rockford, IL, USA). Protein concentration of equivalent volumes (50 µg) from each group were electrophoretically separated on SDS-PAGE (10%). The bands were transferred onto PVDF membrane (Invitrogen). The PVDF membrane was then blocked with TBST buffer (20 mM Tris -pH7.6; 137 mM NaCl; 0.1% Tween 20) that contained 5% non-fat milk at 37℃ for 60 min and were incubated overnight with respective primary antibody (1:1,000) at 4℃. The PVDF membranes were washed with TBST thrice and were incubated at 37℃ with secondary HRP-labelled antibodies (1:2,000) for 60 min. Positive bands were analyzed by chemiluminescence method (Millipore, USA) and analyzed by ChemiDoc XRS imaging system (Bio-Rad, USA). Using internal control (β-actin), the concentration of test proteins was normalized.
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4

Immunoblotting for Protein Expression

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Cells lysed in ice‐cold RIPA buffer (Beyotime, China) supplemented with 10 nM PMSF. The protein samples of equal amount were resolved on 10% SDS polyacrylamide gels and transferred to polyvinylidene fluoride membranes at 100 V for 2.5 hours. 5% fat‐free milk in TBST was used to block the membrane, followed by adding primary antibodies (Abcam, Cambridge) (anti‐LDHA, 1: 500) and incubation at 4°C overnight. Secondary antibodies (1:5000) were added and incubated for 2 hours at room temperature. The protein bands were visualized using the chemiluminescence method (Millipore, MA). Image J software (National Institutes of Health, Bethesda) was used to analyze the protein expression levels. GAPDH (1:1000) was used as the control.
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5

Protein Extraction and Western Blot

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Extracted proteins from tissues and cells using Radio Immunoprecipitation Assay lysis buffer (RIPA, R0010) from Solarbio Life Sciences (Beijing, China). The BCA reagent kit from Thermo Scientific (23225, Waltham, USA) was used to detect protein concentration. Protein lysates were loaded on a 10% tris-glycine gel and transferred to a 0.22 μm polyvinylidene difluoride membrane. The primary antibodies (Supplementary Table 3) used to detect protein bands in the membranes included HIF-1α, YAP1, phosphorylated (p)-YAP(S127), Collagen type I alpha 1 (Col1A), mitochondrial oxide phosphorylation complex cocktails (OXPHOS), HIF-2α, α-smooth muscle actin (α-SMA), tubulin from Cell Signaling Technology (Danvers, USA) and β-actin from Sigma-Aldrich (St. Louis, US). The anti-rabbit immunoglobin G HRP-linked antibody and anti-mouse immunoglobin G horseradish from Cell Signaling Technology (Danvers, USA). The chemiluminescence method from Millipore Corporation was used to display the protein bands of western blot. The protein bands were visualised using an Amersham Imager 600 (GE, USA) and were quantified using densitometry analysis (Image J x64 software, NIH).
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6

UVB-Induced Cellular Responses in HaCaT Cells

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HaCaT stable cells were seeded in 60mm dishes. After 24h, the cells were treated with UVB 50mj/cm2. After 6 hours of UVB irradiation, cells were extracted a lysed by using RIPA lysis buffer (50 mMTris-HCl pH7.5, 1% NP-40, 0.5 mM EDTA, 0.1% SDS, 150 mMNaCl, 0.5% Sodium deoxycholate) with PMSF (Beyotime, China). The cell lysate was centrifuged at 13,000 RPM for 15 min at 4°C. BCA assay (Beyotime, China) was used to measure the protein concentration. The protein samples were separated by 15% SDS-PAGE and then transferred to polyvinylidene fluoride (PVDF) membranes (PALL, USA). PVDF membrane was blocked in 1XTBST with 5% nonfat milk for one hour and then incubated with primary antibodies at 4ºC overnight. After overnight incubation, the membrane was washed three times with 1xTBST and incubated with corresponding secondary antibodies for 1h at room temperature. Following a triple washing step with 1XTBST, the bands were visualized with the chemiluminescence method (Millipore, USA). Antibodies including GAPDH, Smad4, Bcl-2, Bax, and Caspases anti-rabbit or anti-mouse secondary antibodies were purchased from santa cruz and cell signalling (USA).
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7

SDS-PAGE Immunoblot Analysis of Proteins

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Samples containing equal amounts of protein were denatured in SDS sample buffer, subjected to SDS-PAGE, transferred onto a PVDF membrane, and applied to immunoblot analysis. Protein bands on immunoblots were visualized by a chemiluminescence method (Millipore) and an imaging documentation system (ImageQuant LAS 4000, GE healthcare). Images were analyzed using ImageJ. Primary antibodies against CCNY (Proteintech group), GFP (Roche), GluA1 (a gift from Michael Ehlers, Pfizer Neuroscience), phospho-GluA1 (S845) (Thermo scientific), PSD-95 (Thermo scientific, 7E3-1B8), Synaptophysin (Synaptic Systems), Prox1 (Proteintech group), Ctip2 (Genetex), Py (a gift from D.T.S. Pak, Georgetown Univ.) or β-tubulin (Abcam) were used.
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8

Western Blotting Procedure for Protein Quantification

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Cells were lysed in RIPA lysis buffer (50 mM Tris-HCl pH7.5, 1% NP-40, 0.5 mM EDTA, 0.1% SDS, 150 mM NaCl, 0.5% Sodium deoxycholate) with PMSF (Beyotime, China). Cell lysate was centrifuged at 14,000 rpm for 10 min at 4°C. The protein concentration was measured by BCA assay (Beyotime, China). The protein samples were separated by 15% SDS-PAGE, and then transferred to polyvinylidene fluoride (PVDF) membranes (PALL, USA). Membranes were blocked in TBST with 5% nonfat milk and then incubated with primary antibodies at 4 °C overnight. After washing with TBST, the membranes were incubated with corresponding secondary antibodies for 1h at room temperature. Following a triple washing step with TBST, the bands were visualized with the chemiluminescence method (Millipore, USA). Antibodies including β-actin, GAPDH, hnRNP A1, SRSF1 and HRP-conjugated anti-rabbit or anti- mouse secondary antibodies were purchased from Santa Cruz (USA).
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9

Cell Wall Isolation and Western Blot Analysis

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The C. albicans cell pellet was harvested by centrifugation, and cell walls were prepared as described elsewhere44 (link). Briefly, the cell pellet was washed 3 times in PBS (pH 7.4) and then centrifuged, then ground to a fine powder in liquid nitrogen at the presence of a protease inhibitor cocktail. Isolated cell walls were washed 3 times with MilliQ water and then boiled for 10 min in SDS extraction buffer [150 mM NaCl, 2% (w/v) SDS, 100 mM Na-EDTA, 100 mM beta-mercaptoethanol, 50 mM Tris/HCl, pH 7.8]. Subsequently, they were washed again with MilliQ water and stored at −20 °C until required.
Equal amounts of proteins of rSap2, cell walls and total cell lysates were separated by SDS-PAGE (10%), and transferred to a PVDF membrane (Millipore, Germany) using a blotting system (Bio-Rad, USA) for 1 h at 90 V. The membrane was incubated with the scFv-phages (1 × 1010 pfu), anti-rSap2 pAb and KM13 phages respectively, and subsequently blotted with different secondary antibodies, i.e., anti-phage g3p antibody for phages and goat anti-rabbit IgG for anti-rSap2 pAb. Detection was achieved with the chemiluminescence method according to the manufacturer’s instructions (Millipore, Germany), and visualized by using the ECL detection system (Tanon 5500, Shanghai, China).
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