Question:
On daily basis, which immunoglobulin is produced in maximum amount
On daily basis, which immunoglobulin is produced in maximum amount
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Antibody Quantity Facts:
Highest Daily Production Rate $\rightarrow$ IgA (Mucosal surfaces, $> 65\%$ of daily output).
Highest Serum Concentration $\rightarrow$ IgG (Longest half-life $\approx 21\text{ days}$).
Highest Daily Production Rate $\rightarrow$ IgA (Mucosal surfaces, $> 65\%$ of daily output).
Highest Serum Concentration $\rightarrow$ IgG (Longest half-life $\approx 21\text{ days}$).
Updated On: Sep 7, 2026
- IgG
- IgM
- IgA
- IgE
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
Mucosal plasma cells in MALT synthesize tremendous quantitative daily volumes of secretory IgA exceeding all other antibody isotypes combined.
Key Formula or Approach:
\[ \text{Daily Synthesis Rate: } \text{IgA } (\approx 60 - 70\text{ mg/kg/day}) \gg \text{IgG } (\approx 30\text{ mg/kg/day}) \gg \text{IgM } (\approx 7\text{ mg/kg/day}) \]
Step 2: Detailed Explanation:
Immunoglobulin turnover kinetics in mammalian biology:
- Although IgG is the most abundant isotype in intravascular serum (constituting $\approx 75-80\%$ of serum antibodies due to its long 21-day half-life),
- Immunoglobulin A (IgA) has by far the highest total daily rate of de novo biological synthesis ($> 3\text{ to } 5\text{ grams per day}$ in large domestic animals and humans).
- Vast populations of mucosal plasma cells in the gut-associated lymphoid tissue (GALT), respiratory, and urogenital tracts continuously secrete dimeric secretory IgA (sIgA) across mucosal surfaces.
Step 3: Final Answer:
Hence, IgA is produced in maximum amount on a daily basis, matching option (C).
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