Water Soluble Extractive Value Formula:
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Definition: Water Soluble Extractive Value indicates the nature of chemical constituents present in drugs or plant materials that are soluble in water.
Purpose: It helps in quality control of herbal drugs and plant materials by measuring the amount of water-soluble components.
The calculator uses the formula:
Where:
Explanation: The difference between dish with residue and empty dish is multiplied by 4 and 100, then divided by the sample weight.
Details: Higher extractive values generally indicate better quality plant material with more water-soluble active constituents.
Tips: Enter the dish weight, dish with residue weight, and sample weight in kilograms. All values must be > 0.
Q1: Why multiply by 4 and 100 in the formula?
A: The multiplication by 4 accounts for the standard extraction process (25ml solvent per gram), and 100 converts to percentage.
Q2: What's a typical value range?
A: Values vary by plant material but typically range from 5% to 50% for most medicinal plants.
Q3: What if my sample weight is in grams?
A: Convert grams to kg (divide by 1000) or adjust the formula accordingly.
Q4: How precise should measurements be?
A: Use analytical balance with at least 0.0001 kg precision for accurate results.
Q5: What does a low extractive value indicate?
A: Low values may suggest poor quality material, improper drying, or low water-soluble constituents.