McFarland Latex Standards
Turbidity standards for adjusting densities of bacterial suspensions
McFarland Standards provide a reference for standardization of bacterial suspensions used for susceptibility testing and other procedures that require a standardized inoculum. Original McFarland Standards (Cat. no. HDMS05-HDMS6) are prepared by adding barium chloride to sulfuric acid resulting in a barium sulfate precipitation.
The McFarland Latex Standards (Cat. no. HDML05-HDML6 and HDML8) are prepared from suspensions of uniform latex particles with similar absorbance values as the original barium sulfate standards. The latex standards are prepared by suspending latex particles in a buffer solution. Sodium azide is added as a preservative. The standards are adjusted to an acceptable absorbance range with a one centimeter light path set at 625nm. Adjusting a bacterial suspension turbidity to a McFarland Standard produces bacterial counts in an expected range. As with the barium sulfate standards, a 0.5 McFarland Standard is comparable to a bacterial suspension of 1.5 X 108 CFU/ml.
The stability of McFarland Latex Standards allows for a significantly longer shelf-life than the original barium sulfate standards due to reduced light sensitivity.
Available McFarland Standard 0.5,1, 2, 3, 4, 5, 6, 7, 8 (16x100mL, 8mL)
Ordering Details: -
Product Code: HDML05 McFarland Latex Equivalent 0.5 HDx, 16 x 100mL, 8mL
Product Code: HDML1 McFarland Latex Equivalent 1 HDx, 16 x 100mL, 8mL
Product Code: HDML2 McFarland Latex Equivalent 2 HDx, 16 x 100mL, 8mL
Product Code: HDML3 McFarland Latex Equivalent 3 HDx, 16 x 100mL, 8mL
Product Code: HDML4 McFarland Latex Equivalent 4 HDx, 16 x 100mL, 8mL
Product Code: HDML5 McFarland Latex Equivalent 5 HDx, 16 x 100mL, 8mL
Product Code: HDML6 McFarland Latex Equivalent 6 HDx, 16 x 100mL, 8mL
Product Code: HDML8 McFarland Latex Equivalent 8 HDx, 16 x 100mL, 8mL