NOBLE AGAR

Noble Agar by Difco

Noble Agar technical specifications are listed below

New Item
Number		 Old Item
Number		 Description Sale Unit 2008 Price
US Dollars
214220 0142-15 Difco Noble Agar 100g $133.40
214230 0142-17 Difco Noble Agar 500g $303.20
Difco NOBLE AGAR Specifications and Technical Information
Difco Agar Noble is a solidifying agent that is essentially free of impurities. It is used in electrophoretic and nutritional procedures and in preparing microbiological culture media when increased purity is required. Difco Noble Agar is extensively washed and bleached. This agar should be used for applications where extreme clarity and high purity are required. Difco Noble Agar is suitable for immunodiffusion, some electrophoretic applications, and as a substrate for mammalian or plant tissue culture. Specifications are as follows:
Dehydrated Media Appearance White to off white free flowing homogenous fine granules
Solution Concentration 1.5%
Solution Appearance Solution is colorless, clear to very slightly opalescent.
Loss on drying Equal or less than 20%
Ash Equal or less than 2%
Calcium Equal or less than 1,000 ppm
Magnesium Equal or less than 200 ppm
Melting Point Equal to or greater than 85 Degrees Celsius
Gel Point 32 ~ 39 Degrees Celsius
 
CHEMICAL ANALYSIS OF NOBLE AGAR & OTHER DIFCO AGARS
  Bacto
Agar		 Difco
Agar Granulated 		Difco
Agar Technical		 Difco
Noble Agar
Concentration Percent 1.5 1.5 1.5 1.5
Ash (%) 3.6 3.4 4.1 1.3
Clarity (NTU)* 4.3 5.3 26.2 3.7
Color (430 nm, adsorbance) N/A N/A N/A N/A
Loss on Drying (%) 17.3 12.2 18.2 16
pH 6.5 6.6 6.9 5.7
Gel Strength (g/cm2) 600 560 613 700
Gelation Point (°C) 35 35 36 35
Melting Point (°C) 88 88 88 87
Resistivity (ohms) N/A N/A N/A N/A
-m r (electrophoretic)** N/A N/A N/A 0.55
Inorganics (%)
Calcium 0.179 0.133 0.11 0.015
Chloride 0.021 < 0.005 0.172 < 0.050
Cobalt < 0.001 < 0.001 < 0.001 < 0.001
Copper < 0.001 < 0.001 < 0.001 < 0.001
Iron 0.002 0.003 0.002 < 0.001
Lead < 0.001 < 0.001 < 0.001 < 0.001
Magnesium 0.068 0.041 0.093 0.002
Manganese < 0.001 < 0.001 < 0.001 < 0.001
Nitrate < 0.005 < 0.005 < 0.005 < 0.050
Phosphate < 0.005 0.01 0.015 < 0.050
Potassium 0.121 0.079 0.124 0.022
Sodium 0.837 0.776 0.932 0.335
Sulfate 1.778 1.71 0.367 0.663
Sulfur 0.841 0.868 0.646 0.333
Tin < 0.001 < 0.001 < 0.001 < 0.001
Zinc < 0.001 < 0.001 < 0.001 < 0.001
Biological Testing (CFU/g)
Spore Count < 1,000 < 1,000 4,300 < 1,000
Standard Plate Count < 1,000 < 1,000 2,725 < 1,000
*Nephelometric turbidity units (NTU).
**Unit of relative electroendosmosis.