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Food antioxidants

Erythorbic acid

Also known as D-Isoascorbic acid, Isoascorbic acid, D-Araboascorbic acid

CAS 89-65-6Formula C6H8O6Molar mass 176.12 g/molEC 201-928-0
GHS signal word: Warning. Pictograms: Harmful or irritant 72 suppliers listed
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Erythorbic acid chemical structure, C6H8O6, CAS 89-65-6
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Shiny granular crystals from water or dioxane
Melting point
174 °C
Solubility
In water, 40 g in 100 mL water at 25 °C
HS code
293220
Category
Food antioxidants
Illustrative photo, a shrink wrapped pallet of kraft paper sacks in a chemical plant
Typical packagingIllustrative packaging image, not the actual product

What is Erythorbic acid?

Plain description, key identifiers and synonyms

D-isoascorbic acid is an ascorbic acid.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
(2R)-2-[(1R)-1,2-dihydroxyethyl]-3,4-dihydroxy-2H-furan-5-one
CAS number
89-65-6 CAS number cross-checked
EC number
201-928-0
Molecular formula
C6H8O6
UNII
311332OII1
MDL number
MFCD00005378
INCI name
ERYTHORBIC ACID
InChIKey
CIWBSHSKHKDKBQ-DUZGATOHSA-N
InChI
InChI=1S/C6H8O6/c7-1-2(8)5-3(9)4(10)6(11)12-5/h2,5,7-10H,1H2/t2-,5-/m1/s1
Canonical SMILES
O=C1OC(C(O)CO)C(O)=C1O
Isomeric SMILES
C([C@H]([C@@H]1C(=C(C(=O)O1)O)O)O)O

Synonyms

  • D-Isoascorbic acid
  • Isoascorbic acid
  • D-Araboascorbic acid
  • D-Erythorbic acid
  • Araboascorbic acid
  • Isovitamin C
  • Glucosaccharonic acid
  • Erycorbin
  • Neo-cebicure
  • Saccharosonic acid
  • Mercate 5
  • D-erythro-3-Ketohexonic acid lactone
  • D-erythro-3-Oxohexonic acid lactone
  • 2,3-Didehydro-D-erythro-hexono-1,4-lactone
  • (2R)-2-[(1R)-1,2-dihydroxyethyl]-3,4-dihydroxy-2H-furan-5-one
  • 3-Keto-D-erythro-hexonic acid gamma-lactone
  • (5R)-5-[(1R)-1,2-dihydroxyethyl]-3,4-dihydroxyfuran-2(5H)-one
  • erythroascorbic acid
  • (2R)-2-((1R)-1,2-dihydroxyethyl)-3,4-dihydroxy-2H-furan-5-one
  • (5R)-5-((1R)-1,2-Dihydroxyethyl)-3,4-dihydroxyfuran-2(5H)-one
  • INS NO.315
  • (5R)-5-((1R)-1,2-dihydroxyethyl)-3,4-dihydroxyfuran-2(5H)-one, D-erythro-hex-2-enono-1,4-lactone
  • D-erythro-ascorbic acid
  • D-(-)-Isoascorbic acid
  • (R)-5-((R)-1,2-dihydroxyethyl)-3,4-dihydroxyfuran-2(5H)-one
Show all 37 synonyms
  • D-soascorbic acid
  • D-erythro-Hex-2-enonic acid, g-lactone
  • D(-)-Isoascorbic Acid (Erythorbic Acid)
  • D-erythro-hex-2-enonic acid gamma-lactone
  • Sodium Ascorbate EP Impurity F
  • D-Ascorbic acid, iso
  • D-erythro-hex-2-enono-1,4-lactone
  • D-Isoascorbic acid 1000 microg/mL in Acetonitrile
  • Erythroascorbic acid, D-
  • (5R)-5-[(1R)-1,2-dihydroxyethyl]-3,4-dihydroxy-2,5-dihydrofuran-2-one
  • Araboascorbic acid, D-
  • D(-?)?-?Isoascorbic Acid (Erythorbic Acid)

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Appearance
Shiny granular crystals from water or dioxaneexp.
Melting point
174 °Cexp.
Solubility
In water, 40 g in 100 mL water at 25 °Cexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
176.12 g/molcalc.
Exact mass
176.0321 Dacalc.
LogP (octanol/water)
-1.41calc.
Topological polar surface area
107.2 Ųcalc.
Hydrogen bond donors
4calc.
Hydrogen bond acceptors
6calc.
Rotatable bonds
2calc.
Heavy atoms
12calc.
Rings
1calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0.5calc.
Formal charge
0calc.
Stereocentres
2calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, O=C1C=CCO1

O=C1C=CCO1

1 ring, 6 atoms, the 2(5H)-Furanone ring system.

877 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.
Precautionary statements (16)
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P332 + P317If skin irritation occurs: Get medical help.
  • P337 + P317If eye irritation persists: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Erythorbic acid suppliers

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All 72 suppliers
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Where suppliers are based

72 suppliers in 18 countries

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Erythorbic acid price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Erythorbic acid is widely used in food applications as an antioxidant. It is also used in oral pharmaceutical applications as an antioxidant.

Reported uses

Table: Reported uses (ppm) for Erythorbic acid [Table#1683].

Antioxidant especially in brewing industry, reducing agent in photography.

Synthetic flavor.

Industrial uses: Reducing agent, Preservative.

Consumer uses: Preservative.

Use classes: Food additives, Cosmetics.

Cosmetic ingredient, INCI name ERYTHORBIC ACID(antioxidant)

Pharmacological actions

  • Antioxidants

Functional uses

  • Antioxidant
  • Biocide
  • Chemical reaction regulator
  • Dye
  • Flavouring and nutrient
  • Food preservative
  • Fragrance

Cosmetic functions

  • Antioxidant

How it is made

Erythorbic acid is synthesized by the reaction between methyl 2-keto-D-gluconate and sodium methoxide. It can also be synthesized from sucrose and produced from Penicillium spp.

Erythorbic acid can also be prepared by reacting 2-keto-D-gluconate with sodium methoxide, synthesized from sucrose, or naturally produced by Penicililum species. Sodium erythorbate is prepared from D-glucose by a combination of biosynthesis and chemical synthesis via the intermediate 2-keto-D-gluconic acid.

Erythorbic acid is produced by the fermentation of D-glucose to 2-keto-D-gluconic acid by Pseudomonas fluorescens bacteria. The fermentation product is esterified and heated in basic solution to yield sodium erythorbate. Upon acidification of the salt in a water-methanol solution, erythorbic acid is formed.

Regulatory status

Inventories, regulations and trade controls that list this substance

Health and food

  • EU cosmetic ingredient inventory
  • Food additive

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Erythorbic acid is traded under.

HS 2932.20Indicative HS code

Lactones

World exports in 2024
$1.97B
−4.7% vs 2023, imports $2.07B
2019 to 2024
Top exporters
  1. China56.3%
  2. India * partner reported7.4%
  3. Germany7.3%
Top importers
  1. United States14.2%
  2. India * partner reported13.5%
  3. Brazil8.5%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Erythorbic acid is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Erythorbic acid, based on the data on this page

What is Erythorbic acid?

D-isoascorbic acid is an ascorbic acid.

What is the CAS number of Erythorbic acid?

The CAS registry number of Erythorbic acid is 89-65-6.

What is the molecular formula and weight of Erythorbic acid?

The molecular formula of Erythorbic acid is C6H8O6 and its molar mass is 176.12 g/mol.

What is Erythorbic acid used for?

Erythorbic acid is widely used in food applications as an antioxidant. It is also used in oral pharmaceutical applications as an antioxidant. Reported uses Table: Reported uses (ppm) for Erythorbic acid [Table#1683]. Antioxidant especially in brewing industry, reducing agent in photography. Synthetic flavor.

Is Erythorbic acid hazardous?

Erythorbic acid carries the GHS signal word "Warning". Main hazards: causes skin irritation, causes serious eye irritation, may cause respiratory irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Erythorbic acid?

Erythorbic acid is usually classified under HS code 293220 (Lactones). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Erythorbic acid?

CompoundList lists 72 suppliers of Erythorbic acid in United States, China, Germany, United Kingdom and 14 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Erythorbic acid in India?

2 suppliers in India list Erythorbic acid on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Erythorbic acid?

Suppliers quote Erythorbic acid on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Erythorbic acid

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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