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Heart Infusion Agar | Nutrient‑Rich Medium for Fastidious Microorganisms | AS‑1246

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AuSaMicS Life Science • Enriched Agar Media

Heart Infusion Agar

Highly Nutritious Agar for Fastidious Microorganisms

Heart Infusion Agar is a rich, non-selective, general-purpose solid medium designed for the isolation and cultivation of fastidious microorganisms. It is widely used in clinical and research microbiology as a nutritive agar for delicate organisms and also serves as an excellent base for blood agar preparation when haemolytic reactions need to be observed.

AS-1246 pH 7.4 ± 0.2 ✓ Australian Stock 🧫 Fastidious Organisms 🩸 Blood Agar Base
Use: Fastidious organism isolation Type: Enriched, non-selective agar Documents: COA + SDS + TDS

 Why Labs Use HI Agar

Rich nutrition for delicate organisms
Blood agar base for haemolysis work
General-purpose enriched solid medium
Classical formulation for clinical microbiology
Consistent quality for reliable plating
Typical Applications
Fastidious bacteria
Blood agar preparation
Haemolysis studies
Vaccine culture work

⚠️ Important: Heart Infusion Agar vs Heart Infusion Broth

Heart Infusion Agar (AS-1246)
A solid enriched medium for colony isolation, cultivation, plate observation, and use as a blood agar base for haemolytic reactions. :contentReference[oaicite:1]{index=1}
Heart Infusion Broth (AS-1247)
A liquid enriched medium better suited to propagation, suspension growth, and broth-based recovery or maintenance workflows.

🔬 Technical Overview & Principle

Heart Infusion Agar is a highly nutritious, non-selective solid medium recommended for the isolation and cultivation of a broad variety of fastidious organisms. Published product sheets describe it as suitable for routine cultivation of demanding bacteria and note that it can also be used as a base for preparing blood agar for haemolysis determination. :contentReference[oaicite:2]{index=2}

Because the medium is rich but not inhibitory, it is useful where strong nutritional support is needed without selective agents or dyes. It has also been described as suitable for Vibrio cultivation, for supplement-based adaptations, and for mass cultivation of organisms in vaccine-related workflows. :contentReference[oaicite:3]{index=3}

Why this medium performs well:
Heart infusion provides rich soluble nutrients, tryptose contributes peptides and amino acids, sodium chloride maintains osmotic balance, and agar creates a firm surface for colony development and observation. This simple but nutrient-dense composition is why HI Agar remains a useful classical medium in clinical microbiology. :contentReference[oaicite:4]{index=4}
Common use cases: isolation of fastidious organisms, preparation of blood agar, observation of haemolytic reactions, enriched plating for sensitive clinical isolates, and specialised supplemented workflows. :contentReference[oaicite:5]{index=5}

🧪 Typical Composition

Ingredient g/L Function Performance Contribution
Heart infusion solids 10.0 Rich nutrient source Provides soluble nutrients associated with enriched growth support for fastidious organisms. :contentReference[oaicite:6]{index=6}
Tryptose 10.0 Peptides and amino acids Supports growth and colony development of nutritionally demanding bacteria. :contentReference[oaicite:7]{index=7}
Sodium chloride 5.0 Osmotic balance Maintains a stable ionic environment for reliable microbial growth. :contentReference[oaicite:8]{index=8}
Agar 15.0 Solidifying agent Provides a firm surface for colony isolation, observation, and blood agar preparation. :contentReference[oaicite:9]{index=9}
Finished medium 40.0 g/L Final pH 7.4 ± 0.2 at 25°C | Published compositions list heart infusion solids 10 g/L, tryptose 10 g/L, sodium chloride 5 g/L, and agar 15 g/L. :contentReference[oaicite:10]{index=10}

🧫 Typical Laboratory Use Workflow

1
Prepare the medium
Reconstitute and sterilise according to the product instructions and validated laboratory method for enriched agar preparation.
2
Use directly or enrich with blood
The medium may be used as an enriched non-selective agar on its own, or it may serve as a blood agar base for haemolytic reaction studies. :contentReference[oaicite:11]{index=11}
3
Inoculate and incubate
Inoculate with the target isolate or specimen and incubate under organism-appropriate conditions. Because the medium is non-selective, it is best suited to clean specimens or controlled workflows where broad recovery is desired.
4
Observe colonies or haemolysis
Use the plate for colony isolation, fastidious organism recovery, or haemolytic pattern observation when prepared as blood agar.

📊 Comparative Enriched Solid Media

Medium Best Use Advantages Considerations
Heart Infusion Agar Fastidious organism isolation and blood agar base work Rich, classical, non-selective agar; suitable for fastidious organisms and haemolysis studies after blood addition. :contentReference[oaicite:12]{index=12} Non-selective, so it is not intended for suppression of mixed background flora.
Brain Heart Infusion Agar Broader cultivation and maintenance of fastidious microorganisms Highly nutritious and widely used across bacteria, yeasts, and molds. :contentReference[oaicite:13]{index=13} Different formulation and broader positioning than classic HI Agar.
Blood Agar Base Dedicated base for blood-enriched isolation media Designed specifically for recovery of fastidious pathogens after blood addition. :contentReference[oaicite:14]{index=14} More specialised toward blood-enriched workflows rather than stand-alone enriched agar use.
Nutrient Agar Routine non-fastidious plating Simple and economical for general lab work Usually not rich enough for many fastidious clinical isolates

📌 Quick Specifications

Product: Heart Infusion Agar
Cat. No.: AS-1246
Format: Dehydrated culture medium
Type: Enriched, non-selective solid agar
Typical use: Fastidious organism isolation
Blood addition: Suitable as blood agar base
Special use: Haemolysis studies
Storage: 10–25°C, dry, tightly closed, protected from moisture and light

⭐ Key Advantages

Rich nutrient support for delicate organisms
Useful as a stand-alone enriched agar or blood agar base
Suitable for haemolytic reaction observation after blood addition
Classical medium for clinical, teaching, and research laboratories
Adaptable to supplemented workflows where needed

⚙️ Preparation Notes

Prepare according to the product instructions and your validated laboratory method.

For blood agar preparation, add sterile blood only after the basal medium has cooled to the appropriate temperature.

Because the medium is non-selective, good aseptic handling is important for reliable isolation performance.

🔗 Related AuSaMicS Products

Heart Infusion Broth

Liquid counterpart for propagation and enriched broth workflows

Brain Heart Infusion Agar

Broader enriched agar for maintenance and cultivation of fastidious microbes

Blood Agar Base Media

Complementary media for blood-enriched isolation workflows

Reliable Enriched Agar for Fastidious Organism Isolation

AuSaMicS supplies high-quality microbiological media designed for dependable performance in clinical, research, and industrial laboratories. Contact us for technical documentation, bulk supply, or method-aligned support.

For laboratory, research, and industrial use only. Not for food, feed, household, cosmetic, therapeutic, or personal use.
AuSaMicS Pty Ltd • ABN 56 676 640 467 • 31 Longview CT, Thomastown, VIC 3074, Australia
www.ausamics.com.au • support@ausamics.com • +61 412 520 598

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