Sodium Metabisulfite for Food and Industrial Applications
Oxidation Control, Yield Preservation and Product Quality Protection
When oxidation causes colour loss, reduced production yield or deterioration of product characteristics, controlling these processes becomes critical to manufacturing profitability. Sodium Metabisulphite (E223) is used in starch processing, food production and winemaking to stabilize technological processes and protect product quality.
For manufacturers, its value is determined not by purchase price alone but by its impact on yield, product quality retention and reduction of production losses. Consequently, selecting the appropriate product directly influences overall financial performance.
Available Options
Formula
Na₂S₂O₅
CAS Number
7681-57-4
EC Number
231-673-0
Synonyms
sodium metabisulfite; sodium metabisulphite; sodium pyrosulfite; sodium pyrosulphite; sodium disulfite; sodium disulphite
E Number
E223
INS Number
INS 223
Functional Class
preservative; antioxidant; bleaching agent
Selection Criteria
SO₂ Activity
Consistent SO₂ activity supports predictable oxidation control and repeatable processing results.
Batch-to-Batch Consistency
Consistent physical and chemical properties support formulation stability and minimise process adjustments.
Application Suitability
Product characteristics matched to the intended application support efficient operation and regulatory compliance.
Impact on Product Quality
Effective oxidation control helps maintain colour, appearance and overall product quality.
Total Process Economics
Evaluating product impact on yield and quality helps optimise overall production costs.
Common Selection Mistakes and Risks
Discoloration of Starch and Plant-Based Products
Ineffective control of oxidation may contribute to discoloration and deterioration of the visual quality of starch and plant-derived raw materials.
This can negatively affect product value, commercial acceptance, and overall production yield.
Therefore, technologists evaluate both reagent consistency and its ability to provide reliable oxidation control under actual process conditions.
Variability in Process Performance
Differences in product activity between batches may affect dosing requirements and the consistency of production results.
This can lead to additional process adjustments, increased monitoring, and greater difficulty maintaining stable operating conditions.
Therefore, technologists assess batch-to-batch consistency and the repeatability of product performance as part of the product evaluation process.
Yield Losses and Reduced Process Efficiency
Insufficient oxidation control may contribute to lower production yields and deterioration of product quality during processing.
In large-scale operations, these effects can create direct economic losses that far exceed the cost of the reagent itself.
Therefore, technologists and production teams assess the impact of a reagent on yield, product quality, and overall process economics rather than comparing purchase price alone.
Documentation Compliance Risks
Food applications and winemaking may be subject to additional requirements regarding documentation, traceability, and regulatory compliance.
Failure to meet these requirements can create challenges during audits or export activities.
Documentation compliance is verified before procurement begins.
Inconsistent Results Between Batches
Variations in reagent characteristics can affect product colour, yield, and process repeatability.
For operations with standardised production parameters, this represents a significant operational risk.
Consistency of supply and product characteristics is often evaluated alongside product price.
Typical Production Challenges
Darkening of Starch Slurry
Oxidation processes can reduce the whiteness of starch slurry and negatively affect the commercial quality characteristics of starch.
This affects product quality and can reduce its market value.
Reduced Starch Yield
Uncontrolled side reactions can lead to losses of the target product during processing and reduce overall production efficiency.
As a result, the production cost per tonne of finished product increases.
Loss of Product Whiteness
Oxidation during processing can lead to undesirable colour changes in starch slurry and finished starch, affecting product appearance and quality.
Reduced product whiteness may lower product value, increase quality-related losses, and affect customer acceptance of the finished product.
Oxidative Deterioration of Product Quality
Oxidation can affect product appearance and the stability of key quality characteristics.
This increases the risk of customer complaints and may require additional process adjustments.
Production Losses During Processing
Insufficient control of oxidation processes increases the loss of valuable raw materials during production.
This reduces the efficiency of resource utilisation and negatively affects overall production economics.
Inconsistent Results Between Batches
Variations in process performance can make it more difficult to achieve consistent product quality from batch to batch.
This increases the workload on laboratory and production control teams.
How the Product Supports the Process
Control of Oxidation Processes
Sodium metabisulfite helps bind oxygen and slow undesirable oxidation reactions during processing.
This supports process stability and helps reduce product losses.
Maintaining Starch Whiteness
Control of oxidation helps maintain the whiteness of starch slurry and finished starch throughout the production process.
This improves the commercial quality attributes of the product and supports its market value.
Consistent Production Yield
Reducing the impact of oxidation processes helps improve the utilisation of raw materials during processing.
This contributes to lower production costs and improved process economics.
Control of Enzymatic Browning
Sodium metabisulfite helps limit oxidative and enzymatic reactions that can contribute to undesirable colour changes during processing.
This helps maintain product whiteness and appearance, supports consistent quality, and reduces losses associated with colour deterioration.
Reduced Production Losses
Control of oxidation and unwanted changes in raw materials helps maintain consistent product quality from batch to batch.
This helps minimise quality-related losses, supports batch-to-batch consistency, and improves overall production efficiency.
Typical Industrial Applications
Corn Starch Production
Sodium metabisulphite is widely used in corn processing operations for the production of starch, where it helps control oxidative reactions throughout the manufacturing process. Its application supports the preservation of key product characteristics and contributes to stable processing conditions.
This application helps maintain starch whiteness, supports process consistency, and contributes to repeatable finished product quality.
Corn Steeping Prior to Wet Milling
During the corn steeping process, sodium metabisulphite is used as part of the preparation stage before the separation of starch, gluten, and germ. Its application helps control oxidative reactions and supports stable processing conditions throughout raw material preparation.
This application helps maintain process consistency, supports efficient raw material processing, and contributes to reliable starch production performance.
Wine and Wine Material Production
In winemaking, sodium metabisulphite is used to help protect grape must, wine, and wine materials from undesirable oxidative processes during production and storage. Its application supports the preservation of key product characteristics throughout the winemaking process.
This application helps maintain product quality consistency, supports the stability of wine characteristics, and contributes to predictable production outcomes.
Production of Dried Fruits
During the processing and drying of apricots, apples, peaches, and other fruits, sodium metabisulphite is used to help reduce undesirable colour changes caused by oxidation. Its application supports the preservation of the visual appearance of the product throughout processing and storage.
This application helps maintain product appearance, supports quality consistency, and contributes to the marketability of dried fruit products.
Fruit and Vegetable Processing
Sodium metabisulphite is used in processing applications where control of enzymatic browning in fruits and vegetables is important. Its use helps preserve the appearance of raw materials and supports the maintenance of product quality during processing and storage.
Food Processes Sensitive to Oxidation
Sodium metabisulphite is used in food manufacturing applications where the control of oxidative reactions can influence colour stability, flavour preservation, or other important product characteristics. Consistent reagent performance helps support stable processing conditions and predictable production outcomes.
This application helps maintain product quality consistency, supports process repeatability, and contributes to reliable finished product characteristics.
Economics of Product Selection
Molecular SO₂ = free SO₂ / (1 + 10^(pH − 1.8)).
The performance of sodium metabisulphite depends on the amount of active SO₂ available within the process.
In winemaking, pH determines the proportion of free SO₂ present in molecular form. As pH increases, higher free SO₂ levels are required to achieve the same protective effect.
In starch processing, results are reflected in starch whiteness, product yield, fraction separation efficiency and batch consistency.
Key process chain:
active SO₂ → oxidation control → colour, whiteness and raw material stability → product yield and quality.
Key process indicators:
• free SO₂;
• molecular SO₂;
• process pH;
• SO₂ dosage;
• starch whiteness;
• colour stability;
• product yield;
• batch-to-batch consistency.
FAQ
Why Is Sodium Metabisulphite Used in Starch Production?
Метабісульфіт натрію
What Factors Influence the Effectiveness of Oxidation Control?
The effectiveness of oxidation control depends on several factors, including reagent quality, dosing accuracy, process conditions, and the characteristics of the raw material being processed. Parameters such as temperature, residence time, and the level of oxidative stress within the process can also influence performance. For this reason, sodium metabisulphite should be evaluated as part of the overall process rather than as an isolated input.
Why Is Consistent SO₂ Content Between Batches Important?
Consistent SO₂ content helps ensure accurate dosing and predictable performance in processes where sodium metabisulphite is used as a source of sulphur dioxide. Variations in active content may require process adjustments and can affect the repeatability of production results. Reliable batch-to-batch consistency supports stable process control and helps maintain consistent product quality.
Why Is Product Price Not the Most Important Selection Criterion?
In starch production and other oxidation-sensitive applications, the cost of the reagent is often only a small part of the overall process economics. Reduced starch whiteness, lower production yield, or additional process adjustments can create losses that significantly exceed any savings achieved through a lower purchase price. For this reason, specialists typically evaluate the impact of sodium metabisulphite on product quality, process stability, and production performance rather than comparing price alone.
What Problems Can Arise from Inconsistent Reagent Quality?
Inconsistent reagent quality can lead to variations in process performance, the need for dosing adjustments, and reduced control over oxidation-sensitive operations. In starch production and similar applications, these variations may affect product whiteness and process stability. Consistent sodium metabisulphite quality helps support predictable results and reliable manufacturing performance.
What Information Should Be Provided for Product Selection?
To recommend the most suitable sodium metabisulphite product, it is helpful to understand the type of production process, expected consumption volumes, and any documentation or compliance requirements. Information about the intended application, process conditions, and quality expectations may also be relevant. Providing these details helps ensure that the selected product aligns with operational, regulatory, and production requirements.
Regulatory References
REACH
REACH registered / compliant
CLP
Acute Tox. 4 H302; Eye Dam. 1 H318; EUH031
UN Number
not applicable
ADR Class
not applicable
HS Code
2832100000
GNG Code
283210
ETSNV Code
48381
DKPP Code
20.13.4
Applicable Standards
E223; Codex INS 223; FCC