For the rapid, sensitive and accurate measurement of Glucose in various samples
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1 ab65333 Glucose Assay Kit Instructions for Use For the rapid, sensitive and accurate measurement of Glucose in various samples This product is for research use only and is not intended for diagnostic use.
2 1
3 Table of Contents 1. Overview 3 2. Protocol Summary 4 3. Components and Storage 5 4. Assay Protocol 7 5. Data Analysis 9 6. Troubleshooting 10 2
4 1. Overview Glucose (C 6 H 12 O 6 ; FW: ) is a very important fuel source to generate universal energy molecules ATP. Glucose level is a key diagnostic parameter for many metabolic disorders. Measurement of glucose can be very important in both research and drug discovery processes. Abcam s Glucose Assay Kit provides direct measurement of glucose in various biological samples (e.g., serum, plasma, body fluid, food, growth medium, etc.). Glucose Enzyme Mix specifically oxidizes glucose to generate a product which reacts with a dye to generate color (λ = 570 nm) and fluorescence (Ex/Em = 535/587 nm). The generated color and fluorescence is proportionally to the glucose amount. The method is rapid, simple, sensitive, and suitable for high throughput. The assay is also suitable for monitoring glucose level during fermentation and glucose feeding in protein expression processes. The kit detects µm glucose samples. 3
5 2. Protocol Summary Standard Curve Preparation Sample Preparation Prepare and Add Reaction Mix Measure Absorbance or Fluorescence 4
6 3. Components and Storage A. Kit Components Item Quantity Glucose Assay Buffer 25 ml Glucose Probe (in DMSO) 0.2 ml Glucose Enzyme Mix (Lyophilized) 1 vial 100 nmol/µl Glucose Standard 100 µl Store kit at -20 C, protect from light. Warm the Glucose Assay Buffer to room temperature and briefly centrifuge vials before opening. Read the entire protocol before performing the assay. GLUCOSE PROBE: Ready to use as supplied. Warm to >18 C (~room temp) prior to use, to melt frozen DMSO. Store at -20 C, protect from light and moisture. Use within two months. GLUCOSE ENZYME MIX: Dissolve in 220 µl Glucose Assay Buffer, then aliquot & store at -20 C. Keep on ice while in use. Use within two months. 5
7 B. Additional Materials Required Microcentrifuge Pipettes and pipette tips Fluorescent or colorimetric microplate reader 96 well plate Orbital shaker 6
8 4. Assay Protocol 1. Standard Curve Preparation: a. For colorimetric assay: Dilute the Glucose Standard to 1 nmol/µl by adding 10 µl of the Glucose Standard to 990 µl of Glucose Assay Buffer, mix well. Add 0, 2, 4, 6, 8, 10 µl into a series of well on a 96 well plate. Adjust volume to 50 µl/well with Glucose Assay Buffer to generate 0, 2, 4, 6, 8, 10 nmol/well of Glucose Standard. b. For the fluorometric assay: Dilute the Glucose Standard solution to 0.1 nmol/µl by adding 10 µl of the Glucose Standard to 990 µl of Glucose Assay Buffer, mix well. Then take 20 µl into180 µl of Glucose Assay Buffer. Mix well. Add 0, 2, 4, 6, 8, 10 µl into a series of wells as in the colorimetric assay. Adjust volume to 50 µl/well with Glucose Assay Buffer to generate 0, 0.2, 0.4, 0.6, 0.8, 1.0 nmol/well of the Glucose Standard. 2. Sample Preparation: Prepare test samples at a total volume of 50 µl/well with Glucose Assay Buffer in a 96-well plate. If using serum, limit sample volume to µl/assay. Adjust the final volume to 50 µl with Assay buffer. Normal serum contains ~5 nmol/µl glucose can be directly diluted in the Glucose Assay Buffer. 7
9 We suggest testing several doses of your sample to make sure the readings are within the standard curve range. 3. Glucose Reaction Mix: Mix enough reagent for the number of assays to be performed: For each well, prepare a total 50 µl Reaction Mix containing: Glucose Assay Buffer 46 µl Glucose Probe* 2 µl Glucose Enzyme Mix 2 µl Mix well. Add 50 µl of the Reaction Mix to each well containing the Glucose Standard and test samples. Mix well. * Note: The fluorometric assay is ~10 times more sensitive than the colorimetric assay. Use 0.4 µl of the probe per reaction to decrease the background reading / increase detection sensitivity significantly. 4. Incubate the reaction for 30 minutes at 37 C, protect from light. Measure absorbance at 570 nm for colorimetric assay or Ex/Em = 535/590 nm for fluorometric assay in a microplate reader. 8
10 5. Data Analysis Correct background by subtracting the value derived from the zero glucose control from all readings. The background reading can be significant and must be subtracted from sample readings. Glucose concentrations of the test samples can then be calculated. Concentration = Sa / Sv (nmol/µl or µmol/ml or mm) Where: Sa is sample amount (in nmol) from standard curve. Sv is sample volume (in µl) added into the sample wells. Glucose Molecular Weight
11 6. Troubleshooting Problem Reason Solution Assay not working Unexpected results Assay buffer at wrong temperature Protocol step missed Plate read at incorrect wavelength Unsuitable microtiter plate for assay Measured at wrong wavelength Samples contain impeding substances Unsuitable sample type Sample readings are outside linear range Assay buffer must not be chilled - needs to be at RT Re-read and follow the protocol exactly Ensure you are using appropriate reader and filter settings (refer to datasheet) Fluorescence: Black plates (clear bottoms); Luminescence: White plates; Colorimetry: Clear plates. If critical, datasheet will indicate whether to use flat- or U-shaped wells Use appropriate reader and filter settings described in datasheet Troubleshoot and also consider deproteinizing samples Use recommended samples types as listed on the datasheet Concentrate/ dilute samples to be in linear range 10
12 Samples with inconsistent readings Lower/ Higher readings in samples and standards Unsuitable sample type Samples prepared in the wrong buffer Samples not deproteinized (if indicated on datasheet) Cell/ tissue samples not sufficiently homogenized Too many freezethaw cycles Samples contain impeding substances Samples are too old or incorrectly stored Not fully thawed kit components Out-of-date kit or incorrectly stored reagents Reagents sitting for extended periods on ice Incorrect incubation time/ temperature Incorrect amounts used Refer to datasheet for details about incompatible samples Use the assay buffer provided (or refer to datasheet for instructions) Use the 10kDa spin column (ab93349) Increase sonication time/ number of strokes with the Dounce homogenizer Aliquot samples to reduce the number of freeze-thaw cycles Troubleshoot and also consider deproteinizing samples Use freshly made samples and store at recommended temperature until use Wait for components to thaw completely and gently mix prior use Always check expiry date and store kit components as recommended on the datasheet Try to prepare a fresh reaction mix prior to each use Refer to datasheet for recommended incubation time and/ or temperature Check pipette is calibrated correctly (always use smallest volume pipette that can pipette entire volume) 11
13 Problem Reason Solution Standard curve is not linear Not fully thawed kit components Pipetting errors when setting up the standard curve Incorrect pipetting when preparing the reaction mix Air bubbles in wells Concentration of standard stock incorrect Errors in standard curve calculations Use of other reagents than those provided with the kit Wait for components to thaw completely and gently mix prior use Try not to pipette too small volumes Always prepare a master mix Air bubbles will interfere with readings; try to avoid producing air bubbles and always remove bubbles prior to reading plates Recheck datasheet for recommended concentrations of standard stocks Refer to datasheet and re-check the calculations Use fresh components from the same kit For further technical questions please do not hesitate to contact us by (technical@abcam.com) or phone (select contact us on for the phone number for your region). 12
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16 UK, EU and ROW Tel: +44 (0) US, Canada and Latin America Tel: ABCAM (22226) China and Asia Pacific Tel: ( 中國聯通 ) Japan technical@abcam.co.jp Tel: +81-(0) Copyright 2012 Abcam, All Rights Reserved. The Abcam logo is a registered trademark. All information / detail is correct at time of going to print. 15
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