Understanding the Concept:
Honey is a natural sweet substance produced by honey bees from floral nectar. Due to its commercial value, honey is frequently adulterated with artificial invert sugar, sugar syrup, and other sweetening agents.
Several chemical tests are available to assess the authenticity and purity of honey. Among these, Fiehe's test is a classical pharmacognostic test used to detect the presence of artificial invert sugar and evaluate honey purity.
Step 1: Understand why purity testing of honey is necessary.
Honey is often subjected to adulteration because genuine honey is more expensive than artificial sweetening preparations.
Common adulterants include:
• Invert sugar
• Cane sugar syrup
• Corn syrup
• Glucose syrup
Therefore, analytical tests are required to distinguish genuine honey from adulterated samples.
Step 2: Study the principle of Fiehe's test.
Fiehe's test is based on the detection of hydroxymethylfurfural (HMF), a compound produced when sugars are heated or subjected to acid treatment.
Excessive HMF formation may indicate adulteration or improper processing.
A positive reaction produces a characteristic red coloration, indicating possible presence of artificial invert sugar.
Step 3: Examine Barfoed's test.
Barfoed's test is used to distinguish monosaccharides from disaccharides.
Although related to carbohydrate chemistry, it is not specifically used as a pharmacognostic purity test for honey.
Hence, Option (A) is incorrect.
Step 4: Examine Kedde test.
Kedde test is used for the identification of cardiac glycosides.
It has no role in evaluating honey purity.
Therefore, Option (C) is incorrect.
Step 5: Examine Salkowski's test.
Salkowski's test is employed for the detection of sterols and triterpenoids.
It is unrelated to honey analysis.
Hence, Option (D) is also incorrect.
Step 6: Identify the appropriate test for honey.
Among the given options, only Fiehe's test is specifically associated with the assessment of honey purity and detection of adulteration involving artificial invert sugar.
Conclusion:
Fiehe's test is the standard pharmacognostic test used to determine the purity of honey and detect adulteration. Therefore, the correct answer is Option (B).