EC-MUG Medium - BioReagent

Cat. No.: E1528690

GRADE & PURITY BioReagent

Storage

Room temperature

Shipped In

Normal

Overview

For Escherichia coli enumeration

Specifications

Specifications & Purity

BioReagent

Storage

Room temperature

Shipped In

Normal

Grade

BioReagent

Product Line

Biological Products

Application Protocols

General protocol (literature; adapt to your SOP and the product label)

1. Medium preparation

• Weigh the directed amount of EC-MUG Medium powder per liter of high-purity water (per label/CoA). Mix until dissolved. Adjust pH if instructed by the label.
• Sterilize by autoclaving as directed. Protect from strong light. If instructed, aseptically add any heat-labile supplements after cooling to ~45–50 °C.

2. Inoculation and incubation

• Inoculate with test sample or with appropriate positive/negative controls. For water testing, process sample volumes consistent with the governing method (e.g., presence/absence or MPN schemes).
• Incubate under EC conditions (literature commonly ~44–45 °C) for 18–24 h, or as specified by your method.

3. Detection and interpretation

• Examine tubes in a darkened area using a 365 nm UV lamp. Blue fluorescence indicates MUG hydrolysis (presumptive E. coli if growth/selectivity criteria are met). Record presence/absence or MPN.
• If quantitation is desired, measure fluorescence with a fluorimeter (Ex ~360–365 nm / Em ~445–455 nm) and compare to controls/standards.

Controls and QA

• Include a GUD+ E. coli reference strain and a GUD− control each run. Verify sterility of uninoculated medium.

Item-specific preparation mass, volumes, and cycle parameters

• Not specified for this item; refer to CoA/Spec Sheet.

Biological Roles

Scope (literature)

• Target organism physiology: Escherichia coli commonly encodes β-D-glucuronidase (GUD, uidA gene), enabling hydrolysis of glucuronides. This enzymatic activity is exploited for fluorogenic detection with MUG.
• Indicator chemistry: MUG is a synthetic glucuronide; its hydrolysis yields 4-methylumbelliferone (MU), which is not a native metabolite but provides a sensitive fluorescent signal correlating with GUD activity.

Considerations and caveats

• Variability: A subset of E. coli strains (notably some O157:H7) are GUD-negative, which can lead to false negatives in MUG-based confirmation. Conversely, a few non-E. coli organisms may exhibit GUD activity, causing potential false positives if selectivity is weak.
• Temperature tolerance: EC-based media often incorporate incubation at elevated temperature (e.g., ~44–45 °C) to enrich thermotolerant coliforms/E. coli.

Application relevance

• The biological role assessed here is enzymatic phenotype (GUD) as a marker for E. coli in environmental/food microbiology. The medium provides nutrients for growth plus an embedded enzymatic probe to report on target activity.

Item-specific organism panels and performance claims

• Not specified for this item; refer to CoA/Spec Sheet.

Buffer Applications

Not typically applicable.

• EC-MUG Medium is a complex culture medium, not a defined buffering agent. While prepared broths possess some intrinsic buffering capacity from their constituents, the product is not intended for precise pH buffering applications.
• For buffering needs, use defined buffer systems (e.g., phosphate, Tris, HEPES) as appropriate to your experimental design.

Green Alternatives

Context

• EC-MUG Medium is an aqueous, solvent-free working system once prepared. Environmental considerations focus on preparation efficiency, waste reduction, and energy use.

Greener practice options (literature)

• Energy-efficient sterilization: Consolidate autoclave loads and use validated minimum cycles to reduce energy/water consumption.
• Right-size batching: Prepare only the volume needed for each testing cycle to minimize expired/unused broth disposal.
• Reusable glassware: When feasible, use reusable culture vessels to reduce single-use plastics; ensure validated cleaning/sterilization.
• Alternative methods: Enzymatic/fluorogenic test kits (e.g., presence/absence or quanti-tray style assays) can reduce culture volumes and solid waste, though they may involve proprietary plastics; tradeoff analysis is case-dependent.

Comparison (literature; qualitative)

• Dehydrated medium vs. ready-to-use bottled broth: Dehydrated powder ships with lower mass and volume, reducing transport emissions and packaging waste; requires autoclaving energy on-site.
• Culture-based vs. molecular assays (PCR/qPCR): Molecular methods can be faster with potentially less biological waste but may use more single-use plastics and specialized reagents; culture remains cost-effective and aligns with many compendial methods.

Item-specific eco-metrics

• Not specified for this item; refer to CoA/Spec Sheet if environmental declarations are provided.

Pharmaceutical Uses

Scope

• This product is not an excipient or an active pharmaceutical ingredient. It is a research/microbiology culture medium.

Relevant pharma-adjacent uses (literature)

• Environmental monitoring and water system testing in GMP facilities may employ EC/MUG-based methods for E. coli detection as part of hygiene and utility monitoring programs. Use is method- and compendia-driven; validate per pharmacopeial or regulatory guidance where applicable.
• Incoming material or process water screening for coliforms/E. coli can use culture-based MUG confirmation in quality control labs.

Regulatory and quality notes

• Pharmacopeia monographs may specify particular media or performance criteria for microbial limit and water tests. Confirm acceptability of EC-MUG Medium against the required method; when mandated, use the specified medium.

Item-specific pharmacopeial status, compliance, or endotoxin/bioburden limits

• Not specified for this item; refer to CoA/Spec Sheet.

Research Use Note (from Product Data)

• For research use only.

Physical Properties

Item-specific facts (from Product Data)

• Appearance: Not specified for this item; refer to CoA/Spec Sheet.
• Molecular weight, formula: Not specified for this item; refer to CoA/Spec Sheet.

Literature/general properties for EC-type MUG media (not specifications for this item)

• Physical form: Dehydrated powder; yields a clear to slightly opalescent broth upon dissolution and sterilization.
• Solubility: Freely soluble in water; intended for aqueous preparation only.
• Typical prepared medium pH (at 25 °C): Often near neutral (≈6.9–7.5) depending on formulation; confirm on label/CoA.
• Optical behavior: After incubation with GUD-positive organisms, the medium shows blue fluorescence of 4-methylumbelliferone under ~365 nm UV; emission commonly observed around 445–455 nm in alkaline conditions.
• Stability considerations: MUG and the MU fluorophore are photosensitive; prolonged exposure to strong light may reduce signal. Many dehydrated media are hygroscopic; clumping may occur if exposed to humidity.

Notes

• Do not treat the above as specifications. Always follow the specific mass-per-liter, pH targets, and sterilization guidance printed on the product label or CoA for this SKU.

Quality & Grades

Item-specific facts (from Product Data)

• Grade/Purity: BioReagent

What BioReagent typically signifies (general)

• BioReagent grade products are suitable for biological laboratory use, emphasizing consistency, low bioburden, and performance in biochemical or microbiological applications. For culture media, this generally translates to lot-to-lot reproducibility in growth and indicator response characteristics.

Implications for this product

• EC-MUG Medium performance is driven by the balance of selectivity (suppression of non-targets) and sensitivity (robust fluorescence in GUD-positive E. coli). BioReagent grading supports these outcomes by controlling raw material quality (e.g., peptone nitrogen content, carbohydrate background), indicator purity, and moisture content.

Verification and documentation

• Item-specific acceptance criteria (e.g., growth promotion tests, selectivity/indicative response, pH of prepared medium, sterility) are Not specified for this item; refer to CoA/Spec Sheet.
• For regulated workflows, retain the CoA for the lot used and perform in-house quality control: sterility checks, positive/negative control responses (e.g., E. coli GUD+ vs. GUD− strains), and fluorescence verification under defined conditions.

Stabilizers/antifoams/UV cutoff

• Not specified for this item; refer to CoA/Spec Sheet.

Reaction & Applications

Scope (literature)

• Primary application: Detection and/or confirmation of Escherichia coli via β-D-glucuronidase (GUD) activity using the fluorogenic substrate MUG. Hydrolysis of MUG releases 4-methylumbelliferone (MU), yielding blue fluorescence under long-wave UV.
• Use cases: Food and beverage testing, environmental water analysis, wastewater monitoring, and general microbiology teaching/research where E. coli detection is required.

Mechanistic notes (indicator chemistry; literature)

• Enzymology: GUD catalyzes cleavage of the β-glucuronide bond of MUG to form MU and glucuronic acid. MU’s phenolate is highly fluorescent (excitation ~360–365 nm; emission ~445–455 nm), particularly under mildly alkaline conditions.
• Selectivity layer: EC formulations typically include bile salts and/or other inhibitors that suppress Gram-positive bacteria and many non-coliforms, enriching for coliforms/E. coli. The MUG readout adds biochemical confirmation on top of growth at elevated temperatures.

Practical tips (literature)

• Controls: Always include GUD-positive (e.g., E. coli ATCC strains) and GUD-negative controls (e.g., E. coli O157:H7 often GUD−, or non-coliforms). This verifies both selectivity and fluorogenic performance.
• Light management: Protect prepared medium and incubated cultures from strong light to preserve MUG integrity and MU signal.
• Reading fluorescence: Use a handheld 365 nm UV lamp in a darkened room; for quantitation, a fluorimeter with appropriate filters can be employed.

Item-specific directions for use

• Not specified for this item; refer to CoA/Spec Sheet.

Reaction Conditions

Preparation and incubation conditions (literature; general guidance, not item-specific specifications)

• Reconstitution: Dissolve the directed mass of dehydrated medium in high-purity water per the product label. Mix until fully dissolved.
• Sterilization: Autoclave as directed (commonly 121 °C). If the formulation contains heat-labile components, sterile-filter them separately and add aseptically after cooling to 45–50 °C.
• Inoculation: Add samples or test cultures using aseptic technique. For quantitative tests, perform serial dilutions as required by the method.
• Incubation: EC-based methods frequently incubate at elevated temperature (typical literature values around 44–45 °C) to select for thermotolerant coliforms and E. coli. Incubation times are often 18–24 h, with method-specific deviations.
• Detection: Examine tubes under a 365 nm UV lamp in a darkened environment. Positive reactions show blue fluorescence attributable to 4-methylumbelliferone. For instrumented detection, use excitation near 360–365 nm and emission near 445–455 nm; adjust slit widths and gain to avoid saturation.
• Controls: Include positive (GUD+) and negative (GUD−) controls every run to validate selectivity and indicator function.

Item-specific parameters (mass per liter, target pH, exact autoclave cycle)

• Not specified for this item; refer to CoA/Spec Sheet.

Safety & Handling

Item-specific hazard data (from Product Data)

• Signal word: Not specified for this item; refer to SDS.
• H-statements: Not specified for this item; refer to SDS.
• GHS classification and pictograms: Not specified for this item; refer to SDS.

General safety guidance (literature; not a substitute for the SDS)

• Personal protective equipment: Laboratory coat, nitrile gloves, and safety glasses are recommended when handling dehydrated media and prepared broths. Avoid breathing dust from powdered media.
• Microbiological risk: When inoculated, the medium will contain viable microorganisms. Employ appropriate biosafety practices (e.g., BSL-2 procedures for E. coli where applicable), including biological safety cabinet use for aerosol-generating steps and proper decontamination.
• Incompatibilities: Store away from strong oxidizers and moisture. Avoid prolonged exposure to light to preserve indicator performance.
• Peroxide formation: Not applicable (aqueous medium components do not typically auto-oxidize to peroxides like ethers).
• First aid (general): If inhaled (powder), move to fresh air. Skin/eye contact: Rinse with water for several minutes; remove contaminated clothing. Ingestion: Rinse mouth. Seek medical attention if irritation persists. Spill cleanup: Avoid dust generation; sweep up and dispose in accordance with institutional and local regulations. Disinfect spills of inoculated cultures with appropriate biocides (e.g., 10% bleach) before disposal.

Always consult the product-specific SDS as the authoritative source for hazards, handling, and disposal.

Solvent Selection

Applicability

• This is a dehydrated microbiological medium; solvent selection pertains to its reconstitution for use.

General guidance (literature)

• Primary solvent: High-purity water (e.g., Type II or better). Water quality affects background fluorescence and growth characteristics. Avoid residual chlorine, heavy organic contaminants, and chelators that may perturb selective agents.
• Sterilization strategy: Most EC-type broths are prepared in water and sterilized by autoclaving (commonly 121 °C). Heat-labile components, if present, are typically filter-sterilized separately and added aseptically post-autoclave. Follow the label/CoA for this SKU.
• pH considerations: Adjust pH, if directed, before sterilization to minimize drift.

Comparison with alternatives (literature)

• Buffered vs. unbuffered water: Buffered reconstitution can improve pH stability but may alter selectivity; only use if specified by the product method.
• Ready-to-use formats (bottled broth): Reduce preparation variability and eliminate solvent choice, but increase packaging waste and shipping weight. Dehydrated powder provides flexibility and reduced footprint.

Not specified for this item

• Exact water volume per unit mass, pH targets, and any co-solvent requirements: Not specified for this item; refer to CoA/Spec Sheet.

Storage & Reconstitution

Item-specific facts (from Product Data)

• Storage conditions (as supplied): Room temperature
• Shipped in: Normal (ambient)

General guidance (literature; not item-specific specifications)

• As supplied (dehydrated powder): Keep container tightly closed in a cool, dry place. Protect from humidity and strong light. Use desiccant where appropriate to prevent clumping and degradation of indicator components.
• Shelf life: Follow the lot-specific expiration date printed on the label/CoA.

Reconstitution and working solution handling

• Reconstitute in high-purity water per label instructions. Sterilize as directed (commonly autoclave). Allow to cool and, if needed, aseptically add heat-labile components.
• Protect prepared medium from light to preserve MUG and the MU signal. For short-term storage of prepared broth, refrigeration (2–8 °C) is commonly used in microbiology labs, but follow the product label for this SKU.
• Avoid repeated heat cycles. Discard prepared medium if contamination or precipitation is observed, or if performance in control strains deviates from expected.

Item-specific storage duration after preparation, freeze–thaw guidance, and reconstitution ratios

• Not specified for this item; refer to CoA/Spec Sheet.

Research Use Note

• For research use only.

Structure & Identity

Item-specific facts (from Product Data)

• Product name: EC-MUG Medium (SKU: E1528690)
• Grade/Purity: BioReagent
• Storage conditions: Room temperature; shipped at ambient (Normal)
• Molecular formula: Not specified for this item; refer to CoA/Spec Sheet.
• Molecular weight: Not specified for this item; refer to CoA/Spec Sheet.
• CAS, CID, InChIKey, SMILES: Not specified for this item; refer to CoA/Spec Sheet.

General description (literature)

• EC-MUG Medium is a microbiological culture medium formulated to detect and/or confirm Escherichia coli by incorporation of the fluorogenic substrate MUG (4-methylumbelliferyl-β-D-glucuronide). In organisms expressing β-D-glucuronidase (GUD), MUG is hydrolyzed to release 4-methylumbelliferone (MU), which exhibits blue fluorescence under long-wave UV (≈365 nm).
• Structural features (of the indicator system): MUG is a β-glycoside of the coumarin fluorophore 4-methylumbelliferone. Hydrolysis cleaves the glycosidic bond, unmasking the phenolic coumarin, which is strongly fluorescent in alkaline conditions.
• Medium architecture: Typically a dehydrated blend of nutrients (peptones/tryptones), salts (buffering/osmotic), selective agents (to suppress non-target flora), and the MUG indicator. Exact formulation may vary by manufacturer and is not provided here.

Synthetic Utility

Not applicable.

• EC-MUG Medium is not a synthetic building block or reagent for organic synthesis. It is a complex microbiological medium designed for cultivation and fluorogenic detection of E. coli.
• For information relevant to this product, see Reaction & Applications, Reaction Conditions, Target Specificity, and Application Protocols tabs.

Target Specificity

Context (literature)

• Biological target: Escherichia coli possessing β-D-glucuronidase (GUD) activity. The MUG substrate is selectively hydrolyzed by GUD, generating a fluorescent signal that, combined with growth under EC conditions, is used to indicate E. coli.

Selectivity layers

• Cultural selectivity: EC-type media use selective components (e.g., bile salts) and elevated incubation temperatures to suppress many non-target organisms.
• Biochemical specificity: The MUG assay reports on GUD enzyme activity. While common in E. coli, some strains (e.g., many O157:H7) may be GUD−, and some non-E. coli may be weakly GUD+; therefore, MUG is confirmatory rather than absolutely specific.

Performance verification

• Employ strain panels that include known GUD+ E. coli and GUD− controls to quantify sensitivity/specificity in your laboratory context.

Item-specific organism lists, inclusivity/exclusivity data, or verified performance claims

• Not specified for this item; refer to CoA/Spec Sheet.