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ZEIN

ZEIN
CategoriesPlant Extracts and Flavours
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light yellowpowder
Update Time2020-07-04
Detail Information

 

ZEIN, REGULAR GRADE

FOR PHARMACEUTICAL, COSMETIC AND FOOD USE

ZEIN is the water-insoluble prolamine protein of corn gluten.

Description:  

Straw-to-yellow colored granular powder, bland in taste.

Approximate Molecular Weight: 35,000
Bulk Density Range: 1.25 - 2.1 gm/10ml
Identification Tests: 

Positive for (A) and (B) conforms to solubility tests below. 

Solubility in Water:  Insoluble
Solubility in 80% alcohol: Clear to slightly cloudy
ZEIN (Protein): 88-96% calculated on a dry basis
Loss on Drying: 8% maximum (drying for 2 hours at 105 degrees C)
Total Ash:    2% maximum
Heavy Metals: 20 ppm maximum
Arsenic:      3 ppm maximum
Mesh Size:   100% through U.S. 20 mesh
Microbial Limits: The total bacterial count does not exceed
1000 per gram and the tests for Salmonella
species and Escherichia coli are negative.
Standard Packaging: 25 kilo poly bag inside double-walled corrugated 
cartons (55.12 lbs. net)

   

 

ASSAY METHODS FOR ZEIN

 

Identification Tests 

1.                  Add a few drops of nitric acid t.s. to an aqueous ZEIN suspension - heat it.    The solution will be a light yellow color.  After adding ammonia t.s., an orange color develops.

2.                  Add a few drops of copper sulfate t.s. to an alkaline ZEIN solution and warm  it in a warm bath.  A purple color will develop.

 

Assay

Proceed as directed under “Nitrogen Determination” (461) USP XXI, p. 1207.  ZEIN % x 6.25.


Solubility in Alcohol

Dissolve 1 gm in 10 ml of 80% alcohol.


Loss on Drying

Accurately weigh 2.0 gm of sample into a tared weighing dish.  Dry at 105 degrees C for two hours.  Cool to room temperature in a desiccator.  Weigh and calculate the percent loss on drying as follows:

L.O.D. % = Wt. Sample Wet - Wt. Dry X 100
 
                   Wt. Sample Wet

 

Total Ash

Accurately weigh 2 gm of sample into a large tared crucible.  Ignite the contents gently, then heat to a dull red.  Cool to room temperature in a desiccator and add 1 ml concentrated sulfuric acid.  Slowly heat to 800-850 degrees C.  Hold at that temperature for two hours.  Cool to room temperature in a desiccator.  Weigh and calculate the total ash as follows:   

Total Ash % = Sample wt. - Wt. residue X 100
                              
Weight Sample 

 

Heavy Metals  

Proceed as directed under “Heavy Metals” (231) USP XXI, p. 1189 Method II

 

Arsenic  

Proceed as directed under “Arsenic” (211) USP XXI, p. 1187

 

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