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    Question

    Biological importance of gluconic acid

    is
    A that it imparts a refreshing sour taste in many food items such as wine and juice Correct Answer Incorrect Answer
    B as chelating micronutrients Correct Answer Incorrect Answer
    C Both (A) and (B) Correct Answer Incorrect Answer
    D None of the above Correct Answer Incorrect Answer

    Solution

    1. Dual Biological Roles of Gluconic Acid:  A) Food Applications:  a. Acts as a natural acidulant (E574 food additive)  b. Provides mild sourness (pH 3.5-4.5) in: • Wines (balances sweetness) • Fruit juices (enhances flavor) • Baked goods (leavening agent)  c. Approved by FSSAI as pH regulator B) Agricultural Applications:  d. Chelates metal ions (Fe³⁺, Ca²⁺, Mg²⁺) in: • Fertilizers (improves micronutrient absorption) • Irrigation systems (prevents mineral deposits)  e. Used in 30% of commercial micronutrient fertilizers 2. Chemical Properties:  a. Organic acid (C₆H₁₂O₇) derived from glucose oxidation  b. Forms stable complexes with divalent cations 3. Regulatory Status:  a. GRAS (Generally Recognized As Safe) by FDA  b. Permitted under FSSAI Regulation 3.1.3 4. Why Other Options Are Incomplete:  a. (A) or (B) alone only describe partial functionality  b. (D) contradicts established biochemical evidence 5. Industrial Production:  a. Microbial fermentation (Aspergillus niger) - 85% global production  b. Electrochemical oxidation - emerging technology Technical Note: In wines, gluconic acid concentration >1g/L indicates Botrytis cinerea infection (noble rot).  Safety:  • ADI (Acceptable Daily Intake): 0-50 mg/kg body weight (JECFA)  • Banned in infant foods (FSSAI Regulation 2.4) This dual-role functionality makes gluconic acid unique among food acids, justifying the comprehensive answer (C).

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