Tryptic Soy Agar (TSA) with Lecithin and Tween®, USP - Intended Use, Summary, Formula, Storage, Precautions, Procedure

Sep 18, 2026

Hardy Diagnostics Tryptic Soy Agar (TSA) with Lecithin and Tween®, USP is a general-purpose growth medium designed to establish microbiological trends, alerts, and action levels in biologically controlled environments. Prepared from Soybean-Casein Digest Agar and formulated per USP <62>, it supports microbial examination of non-sterile products and meets harmonized USP/EP/JP performance requirements. The document provides ingredients and final pH targets, storage and shelf-life guidance, handling precautions, and core environmental monitoring procedures including CFU counting and plate exposure methods.

LanguageEnglish

CategoryHealthcare

FormatPDF

Pages5

Reading Time13 min

AccessFree to download

Intended Use

Summary

Formula

Storage and Shelf Life

Precautions

Procedure

Before Use

Method of Use

Sedimentation Plate Method

Impact Air Sampling Method

Contact Plate Method

TRYPTIC SOY AGAR (TSA) WITH LECITHIN AND TWEEN®, USP | [Cat. no. G41](Cat. no. G41) | Tryptic Soy Agar (TSA) with Lecithin and Tween®, USP, 15x100mm Plate, 20ml | 10 plates/bag | | --- | --- | --- | | [Cat. no. P34](Cat. no. P34) | Tryptic Soy Agar (TSA) with Lecithin and Tween®, USP, Contact Plate, 15ml | 10 plates/bag | INTENDED USE Hardy Diagnostics Tryptic Soy Agar (TSA) with Lecithin and Tween®, USP is recommended for use as a general growth medium for establishing microbiological trends, alerts, and action levels in biologically controlled environments. The medium is based on Soybean-Casein Digest Agar and is formulated according to the United States Pharmacopoeia (USP) <62> and meets the required USP performance specifications.(1) The medium meets the harmonized USP/EP/JP standards for the microbial examination of non sterile products. SUMMARY Tryptic Soy Agar (TSA) with Lecithin and Tween®, USP is prepared according to the U. S. Pharmacopoeia standard formula for Soybean-Casein Digest Agar and contains digests of soybean meal and casein, which provide amino acids and other nitrogenous compounds to promote growth. Sodium chloride is added to help cells maintain osmotic equilibrium. Dextrose is added as an energy source. Agar is the solidifying agent. FORMULA Ingredients per liter ofdeionized water:* | Pancreatic Digest of Casein | 15.0gm | | --- | --- | | Peptic Digest of Soybean Meal | 5.0gm | | Sodium Chloride | 5.0gm | | Tween® 80 | 5.0gm | | Lecithin | 0.7gm | | Agar | 15.0gm | Final pH 7.3 +/ -0.2 at 25°C. * Adjusted and/or supplemented as required to meet performance criteria. STORAGE AND SHELF LIFE Storage: Upon receipt store at 2-8°C. away from direct light. Media should not be used if there are any signs of deterioration (shrinking, cracking, or discoloration), contamination, or if the expiration date has passed. Product is light and temperature sensitive; protect from light, excessive heat, moisture, and freezing. The expiration date on the product label applies to the product in its intact packaging when stored as directed. The product may be used and tested up to the expiration date on the product label and incubated for the recommended incubation times as stated below. Refer to the document "Storage" for more information. PRECAUTIONS This product may contain components of animal origin. Certified knowledge of the origin and/or sanitary state of the animals does not guarantee the absence of transmissible pathogenic agents. Therefore, it is recommended that these products be treated as potentially infectious, and handle observing the usual universal blood precautions. Do not ingest, inhale, or allow to come into contact with skin. This product is for laboratory use only. It is to be used only by adequately trained and qualified laboratory personnel. Observe approved biohazard precautions and aseptic techniques. All laboratory specimens should be considered infectious and handled according to "standard precautions." Refer to the document "Guidelines for Isolation Precautions" from the Centers for Disease Control and Prevention. For additional information regarding specific precautions for the prevention of the transmission of all infectious agents from laboratory instruments and materials, and for recommendations for the management of exposure to infectious disease, refer to CLSI document M29: Protection of Laboratory Workers from Occupationally Acquired Infections. Sterilize all biohazard waste before disposal. Refer to the document "Precautions When Using Media" for more information. PROCEDURE Before Use: It is possible that variation in temperature and pressure during shipping and storage may cause condensation in the bags or plates. If condensation does occur, remove the plates in a sterile environment and allow them to dry for 10-15 minutes immediately before use. The medium should be warmed to room temperature and the surface should be dry prior to use. To

FAQs

What is the intended use of TSA with Lecithin and Tween®, USP?

It is recommended as a general growth medium to establish microbiological trends, alerts, and action levels in biologically controlled environments.

How is TSA with Lecithin and Tween®, USP formulated and what is the final pH?

It is prepared based on Soybean-Casein Digest Agar using specified ingredient amounts per liter and has a final pH of 7.3 ± 0.2 at 25°C.

What precautions and handling requirements apply to this medium?

Use trained laboratory personnel, follow universal blood precautions and aseptic techniques, treat specimens as infectious, avoid ingestion/inhalation, and sterilize biohazard waste before disposal.

Sep 18, 2026

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