Study Set Content:
The determination is performed in the same way as the determination of the
- diluted alcohol soluble extractive.
- This is the residue, consisting chiefly of cellulose, that remains undissolved after successive treatment with boiling acid and alkali.
Crude fiber
Crude fiber content as a percentage of the sample:
\= B-C x 100/ A
mass of sample in grams
A
loss of mass after ashing during determination
B
loss of mass after ashing during blank test
C
The difference between two parallel determinations carried out on the sample must not exceed (blank) in absolute value for crude fiber contents lower than 10%.
0.3
Crude fiber content % =
100 (A-B/C)
wt. of crucible with dry residue in grams
A
wt. of crucible w/ ash in grams
B
wt. of sample in grams
C
- Are values which are used as parameters to measure the physical and chemical properties of fatty substances, fatty oils, waxes, balsams and resins.
Constants
- used as a basis to determine the purity and quality of these substances
Constants
Common constants used in measuring quantitatively the properties of fatty substances:
- Acid value
- Saponification value
- Ester value
- Iodine value
- Hydroxyl value
- Acetyl value
Also known as acid number or acidity index
Acid value
- The number of mg of KOH necessary to neutralize the free acids in 1 g of oil, fats wax, resin, balsam or similar organic substance
Acid value
- Also known as saponification number or Koettsdorfer index
Saponification value
- is a process by which triglycerides are reacted with sodium or potassium hydroxide (lye) to produce glycerol and a fatty acid salt called "soap."
Saponification
fatty acid salt called
Soap
The number of mg of KOH necessary to neutralize the free acids and saponify the esters in 1 g of oil, fats wax, resin, balsam or similar organic substance.
Saponification value
