ビタミンC（アスコルビン酸）工業合成

ブドウ糖から世界で最も消費されるビタミンへ

Food Processing & Preservation Global Industrial Scale $1.2 billion

概要

Vitamin C (L-ascorbic acid) is manufactured through the Reichstein process or its modern two-step fermentation variant, converting D-glucose into L-ascorbic acid via D-sorbitol. China produces over 80% of the world's supply. The original Reichstein process (1934) involves one fermentation step and multiple chemical steps, while the modern two-fermentation process replaces several chemical steps with a second microbial conversion, reducing waste and cost. Vitamin C is used as a food additive (antioxidant E300), dietary supplement, and pharmaceutical excipient.

化学プロセス

D-Glucose is catalytically hydrogenated to D-sorbitol using Raney nickel. D-Sorbitol is fermented by Gluconobacter oxydans to L-sorbose. In the Reichstein process, L-sorbose is converted to 2-keto-L-gulonic acid (2-KGA) via diacetone-sorbose protection and oxidation. In the modern process, a second fermentation with Ketogulonicigenium vulgare converts L-sorbose to 2-KGA directly. 2-KGA is lactonized with HCl to yield L-ascorbic acid.

D-Glucose + H₂ →[Ni] D-Sorbitol
D-Sorbitol →[G. oxydans] L-Sorbose
L-Sorbose →[K. vulgare] 2-Keto-L-gulonic acid
2-KGA →[HCl, heat] L-Ascorbic acid + H₂O

原材料

  • D-Glucose (C₆H₁₂O₆) — Corn starch hydrolysis (Starting material)
  • Hydrogen gas (H₂) — Steam methane reforming (Reducing agent (for sorbitol))
  • Gluconobacter oxydans — Culture collection (Fermentation organism (step 1))

最終製品

  • L-Ascorbic acid (C₆H₈O₆) — Vitamin supplement, food antioxidant (E300), pharmaceutical (USP/EP/FCC grade, >99% purity)
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Environmental Impact

The Reichstein process uses acetone for protection steps, generating significant organic solvent waste. The two-fermentation route reduces chemical waste by approximately 40%. Raney nickel catalyst requires careful handling and regeneration. Chinese production dominance has raised concerns about environmental standards in manufacturing.

安全性の考慮事項

最新のイノベーション

One-step fermentation processes using engineered microorganisms to convert glucose directly to 2-KGA or ascorbic acid are in development.
Electrochemical oxidation methods offer an alternative to biological oxidation steps with better controllability.

生産規模

200000

トン/年

$1.2 billion

市場価値

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Frequently Asked Questions

What industry uses ビタミンC（アスコルビン酸）工業合成?
ビタミンC（アスコルビン酸）工業合成 is used in the food processing & preservation sector at global industrial scale scale.
What process is involved in ビタミンC（アスコルビン酸）工業合成?
D-Glucose is catalytically hydrogenated to D-sorbitol using Raney nickel. D-Sorbitol is fermented by Gluconobacter oxydans to L-sorbose. In the Reichstein process, L-sorbose is converted to 2-keto-L-gulonic acid (2-KGA) via diacetone-sorbose protection and oxidation. In the modern process, a second
What is the economic significance of ビタミンC（アスコルビン酸）工業合成?
ビタミンC（アスコルビン酸）工業合成 has a market value of $1.2 billion and annual production of 200,000 tons.
What is the environmental impact of ビタミンC（アスコルビン酸）工業合成?
The Reichstein process uses acetone for protection steps, generating significant organic solvent waste. The two-fermentation route reduces chemical waste by approximately 40%. Raney nickel catalyst requires careful handling and regeneration. Chinese production dominance has raised concerns about env
What raw materials are used in ビタミンC（アスコルビン酸）工業合成?
The main raw materials include: D-Glucose (C₆H₁₂O₆), Hydrogen gas (H₂), Gluconobacter oxydans.