E 460(i) Microcrystalline Cellulose: Regulatory Standards, Quality Control and Applications

What is E 460(i)?

(1) Names and Codes

(a) Common Chinese name: 微晶纤维素

(b) English name: Microcrystalline Cellulose (commonly abbreviated as MCC)

(c) EU food additive number: E 460(i) – E 460 is the general category for cellulose;

– (i) denotes microcrystalline cellulose;

– (ii) denotes powdered cellulose.

(d) INS / international number: INS 460(i)

(e) CAS: 9004-34-6

(2) Chemical Nature

Microcrystalline cellulose is purified, partially depolymerised cellulose obtained from α-cellulose derived from plant fibres such as wood pulp or cotton linters. The α-cellulose is subjected to partial hydrolysis with dilute mineral acid, yielding a product enriched in crystalline regions.

(3) General Appearance and Properties

(a) A white or almost white, odourless and tasteless powder, typically consisting of freely flowing, non-fibrous particles.

(b) Insoluble in water, dilute acids and most organic solvents; it can swell and disperse in water.

(c) Exhibits good compressibility, water-induced swelling/disintegration and stability.

How is E 460(i) Defined in Regulations?

1. Origin of the E-number System

(1) E-numbers are the harmonized coding system used by the European Union for food additives. Under the EU food additive legislation, each approved additive is assigned a specific E-number.

(2) The current legal framework governing food additives in the EU includes:

(a) Regulation (EC) No 1333/2008: the EU framework regulation on food additives;

(b) Commission Regulation (EU) No 231/2012 and its subsequent amendments: laying down, for each additive (including E 460(i)), its origin, purity criteria and other necessary specifications.

2. Regulatory Specifications for E 460(i)

(1) In the Annex to Regulation (EU) No 231/2012, E 460(i) is defined as microcrystalline cellulose. The official definition describes it as “purified, partly depolymerised cellulose prepared by the treatment of α-cellulose, obtained as a pulp from fibrous plant materials, with mineral acids”, together with the associated purity requirements.

(2) In 2018, the European Union adopted Regulation (EU) 2018/75, which amended this Annex and specifically updated the specification entries for microcrystalline cellulose E 460(i).

(3) In 2018, the European Food Safety Authority (EFSA) published a re-evaluation scientific opinion on cellulose-based additives (E 460(i), E 460(ii), etc.). EFSA concluded that, under the current conditions of use, they do not raise safety concerns and that the acceptable daily intake (ADI) for these substances should be considered “not specified”.

Typical Laboratory Test Items for E 460(i) Products

As an EU-approved food additive and a commonly used excipient listed in multiple pharmacopoeias, microcrystalline cellulose (E 460(i)) is primarily specified with reference to international standards such as the JECFA Specifications for Food Additives, the Food Chemicals Codex (FCC), the European Pharmacopoeia (Ph. Eur.), USP–NF, JP and others. The definition and key purity criteria for E 460(i) in EU Regulation (EU) No 231/2012 and its amendments are largely based on these technical specifications.

In practical quality control, manufacturers generally comply with the above regulations and pharmacopoeias and, on that basis, establish more detailed in-house specifications tailored to their own processes. The following items can be regarded as the most common and practically useful quality control points for E 460(i) products in laboratory testing. The actual limits should always follow the applicable standard and the certificate of analysis (CoA) for the batch in question.

1. Identification and Basic Characteristics

These tests are used to confirm that the sample is indeed microcrystalline cellulose and to exclude obvious foreign matter or incorrect materials, for example:

(1) Appearance: A white or almost white, odourless, freely flowing powder, without visible foreign particles or pronounced agglomerates.

(2) Solubility / Dispersibility: Insoluble in water, ethanol, ether and dilute mineral acids; forms a white, opaque suspension in water.

(3) Spectroscopic Identification: The infrared spectrum (IR) is concordant with that of a microcrystalline cellulose reference standard.

(4) Structure-related Tests (used in some pharmacopoeias and internal specifications):

(a) Dissolution in cuprammonium or cupriethylenediamine solution followed by viscosity measurement, used to indirectly assess the degree of polymerization;

(b) Reaction with zinc iodide solution or an iodine test to demonstrate characteristic cellulose reactions and to help exclude impurities such as starch.

2. Physicochemical Parameters (Common Control Items)

These parameters are mainly used to check whether the product meets the purity requirements for microcrystalline cellulose and whether there is an excessive level of non-cellulosic impurities. Typical control concepts include:

(1) Assay (as cellulose, on a dry basis)

In accordance with JECFA/FCC and pharmacopoeial requirements, the cellulose content on a dry basis is generally specified as not less than 97% (JECFA/FCC, etc.). Some pharmacopoeias or in-house specifications may also provide an upper limit, for example an allowable range such as 97.0–102.0%.

(2) pH (aqueous dispersion of a defined sample amount)

Commonly controlled between 5.0–7.5 according to international specifications, to ensure that the product is approximately neutral, which is favourable for stability and safe use.

(3) Loss on Drying / Water Content

Generally not more than 7.0%. Depending on the intended use or flowability requirements, some products may have in-house ranges set, for example, between 5–7%.

(4) Total Ash / Sulphated Ash

Used to control inorganic residues. For example, JECFA/FCC typically specify sulphated ash ≤ 0.05%, while some pharmacopoeial or in-house specifications may allow up to 0.1%.

(5) Water-soluble Substances

Reflects the level of non-cellulosic soluble impurities. JECFA usually sets limits of approximately 0.24–0.25%. On this basis, manufacturers may define stricter or slightly wider in-house limits according to their product positioning.

(6) Conductivity (supernatant)

Some pharmacopoeias (e.g. Ph. Eur.) specify that the conductivity of the supernatant from an aqueous dispersion must not exceed a certain value (commonly ≤ 75 μS/cm), as an overall indicator of the level of water-soluble ionic impurities.

(7) Degree of Polymerization / Viscosity (in some standards)

The average degree of polymerization is calculated from viscosity measurements in a specific solvent system. A typical requirement is that the average degree of polymerization must not exceed a certain upper limit (e.g. around 350), to ensure consistency with the definition of microcrystalline cellulose.

3. Impurities and Safety-related Limits

These items focus on potentially toxic or harmful contaminants. Common control strategies include:

(1) Heavy Metals / Lead

International specifications typically provide a limit for lead (Pb) not exceeding a few mg/kg (for example, on the order of 2 mg/kg).

Pharmacopoeias and in-house specifications may also include broader statements such as “heavy metals (as Pb) not more than 10 mg/kg” as an overall limit.

(2) Other Elements and Residues

Depending on product use and applicable regulations, additional limits may be set for arsenic, mercury, cadmium and other elements, total sulphur/sulphates, as well as residual solvents, pesticide residues and specific organic impurities.

In practice, impurity and safety specifications are usually centred on lead and other heavy metals, while assessment and limit setting for other potential elements and residues are made in light of the intended end use.

4. Microbiological Limits (Food / Pharmaceutical Use)

For E 460(i) used as a food additive or pharmaceutical excipient, the product should have good microbiological quality. Specific limits are usually based on pharmacopoeial requirements, relevant guidelines and in-house specifications. Typical control items include:

(1) Total aerobic microbial count

(2) Moulds and yeasts

(3) Indicator organisms (e.g. coliforms, Escherichia coli)

(4) Specified pathogens (e.g. Salmonella spp., Staphylococcus aureus, Pseudomonas aeruginosa, etc.)

When selecting a product, users should check whether the microbiological results given on the CoA meet the requirements of their own experiments or formulations.

5. Particle Size Distribution and Bulk Density (Functional Parameters)

Provided that the basic regulatory/pharmacopoeial specifications for microcrystalline cellulose are met, particle size and bulk density are key parameters for differentiating between product types and matching different processes and formulation requirements. These parameters are usually given by manufacturers on the label or CoA, for example:

(a) Particle size-related parameters: d₁₀ / d₅₀ / d₉₀ or nominal size ranges (e.g. 20 μm, 50–70 μm, 100–200 μm, etc.);

(b) Bulk density range: e.g. 0.26–0.50 g/mL.

In general, finer particle sizes favour tablet compaction and improved mouthfeel, but may compromise powder flowability; coarser grades with higher bulk density are better suited for high-speed tableting and high-load formulations. Therefore, in actual product selection, once conformity with E 460(i) specifications is ensured, the particle size and bulk density grade should be chosen according to the specific formulation and process objectives.

Note: The quality control items and typical ranges listed above are compiled from JECFA, FCC, the European Pharmacopoeia, USP–NF and other international standards, as well as representative manufacturers’ published specifications. They are consistent with the key criteria for E 460(i) microcrystalline cellulose in EU regulations, but they do not constitute a verbatim reproduction of any single legal text. Actual quality assessment and regulatory compliance evaluation must be based on the applicable regulations and the test report (CoA) for the specific batch.

Application Fields of E 460(i) / Microcrystalline Cellulose

1. Food Industry (E 460(i) as a Food Additive)

As an EU-approved food additive, E 460(i) primarily serves the following functions in food:

(1) Anticaking agent, drying aid: Prevents caking in powdered products.

(2) Thickener, stabiliser, emulsification aid: Used in salad dressings, sauces, dairy products and condiments.

(3) Texturiser, bulking agent: Improves the texture and structure of products such as ice cream and baked goods.

(4) Fat replacer and source of dietary fibre: Used in low-fat / low-calorie products to improve mouthfeel while increasing the intake of non-digestible dietary fibre.

Typical product categories include low-fat ice cream, yoghurt, cheese products, baked goods, meat products, seasonings and nutrition-fortified foods.

2. Pharmaceutical and Biopharmaceutical Fields

Microcrystalline cellulose is one of the most established and widely used excipients in tablets and capsules.

(1) Diluent / filler: Provides bulk and good compressibility in tablets and capsules.

(2) Binder: Ensures sufficient mechanical strength of the tablet core.

(3) Disintegrant: Swells rapidly upon contact with water, promoting tablet disintegration in the gastrointestinal tract and improving drug release.

(4) Lubricant / glidant (in certain formulations).

(5) Key excipient for direct compression: Particularly for particle size grades such as MCC 101/102.

3. Cosmetics and Personal Care Products

In formulations such as facial cleansers, masks, toothpaste and colour cosmetics, microcrystalline cellulose can be used as:

(1) Stabiliser, suspending agent

(2) Skin-feel modifier and structural backbone of the bulk phase

(3) Powder filler

4. Research and Industrial Applications

(1) As a chromatographic packing material or support (there are microcrystalline cellulose products specifically designated for chromatographic use).

(2) As a matrix for functional materials, such as composite polymers, 3D printing materials and controlled-release carriers.

Summary of Aladdin Products Related to E 460(i)

Aladdin Cat. No.	Name	CAS No.	Specification / Grade	Classification	Product Features & Typical Applications
M489093	Microcrystalline Cellulose	9004-34-6	ChP, JP, Ph. Eur., E 460(i), FCC, NF	High-grade, multi-pharmacopoeia-compliant microcrystalline cellulose	Complies simultaneously with the Chinese Pharmacopoeia (ChP), Japanese Pharmacopoeia (JP), European Pharmacopoeia (Ph. Eur.), NF, FCC and E 460(i), making it a microcrystalline cellulose grade with very broad pharmacopoeial compatibility. It can cover a wide range of typical dosage-form processes, from wet granulation and roll compaction / spheronisation to direct compression and high-speed tableting. It is highly suitable as a representative laboratory sample of microcrystalline cellulose (MCC) / E 460(i) for teaching demonstrations, formulation design and process development studies.
M489705	Microcrystalline Cellulose	9004-34-6	JP, Ph. Eur., E 460(i), FCC, NF	Multi-pharmacopoeia-compliant MCC	A high-purity microcrystalline cellulose grade compliant with JP / Ph. Eur. / NF / FCC / E 460(i). Suitable for formulation and excipient studies that primarily reference international pharmacopoeias. Commonly used as a diluent / filler and binder in tablets and capsules.
M498254	Microcrystalline Cellulose and Carboxymethylcellulose Sodium	—	Ph. Eur., E 460(i), E 466, NF	Co-processed composite excipient (MCC + Na-CMC)	A synergistic co-processed material formed from microcrystalline cellulose and sodium carboxymethylcellulose. It combines structural support with thickening and suspending properties, functioning as a highly functional suspending agent and emulsifier. Suitable for the development of various liquid dosage forms and formulations requiring stable suspensions.
S489679	Silicified Microcrystalline Cellulose	9004-34-6	Ph. Eur., NF, JP, E 460(i) and Silica, Colloidal Anhydrous, E 551	Silicified microcrystalline cellulose (MCC + colloidal silica)	A composite excipient consisting of microcrystalline cellulose and colloidal silicon dioxide (E 551). It offers improved flowability, compressibility and dispersibility, and exhibits a combination of brittle fracture and plastic deformation behaviour. These characteristics are advantageous for direct compression, high-speed tableting and the development of poorly flowing, high-load formulations.

Practical FAQ

1. Q: What is the difference between E 460, E 460(i) and E 460(ii)?

A: E 460 is the overall code for “cellulose”. Within this group:

E 460(i) = microcrystalline cellulose (MCC), which has higher crystallinity and excellent compressibility;

E 460(ii) = powdered cellulose, which is more commonly used as a fibre filler and anticaking aid.

2. Q: Can microcrystalline cellulose labelled E 460(i) and purchased for laboratory use be used directly in foods or dietary supplements?

A: Generally not. Such products are usually clearly labelled “for research or industrial use only, not for pharmaceutical or food use”, and must not be used directly in commercial foods or clinical products. For formal food or medicinal product manufacturing, you must purchase food-grade or pharmaceutical-grade raw materials that comply with the relevant regulations and subject the supplier to proper qualification and audit.

3. Q: Is there a fundamental difference between products labelled “Microcrystalline Cellulose (MCC)” and those labelled “E 460(i)”?

A: Their chemical nature is usually the same. However, explicitly labelling a product as E 460(i) indicates that its quality corresponds to the E-number food additive grade as defined in legislation, with stronger emphasis on alignment with FCC, pharmacopoeial and EU regulatory requirements. In all cases, the CoA should be reviewed to confirm which standards the product actually meets.

4. Q: Is microcrystalline cellulose absorbed by the human body? How safe is it?

A: EFSA’s 2018 re-evaluation concluded that cellulose-based additives (including E 460(i)) are essentially not absorbed in the small intestine and are mostly excreted in the faeces. They exhibit very low toxicity in animals and humans, and the NOAEL values for long-term intake are relatively high. EFSA therefore considered that there is no need to set a numerical ADI, and that there is no safety concern at current levels and patterns of use. This indicates that, under conditions permitted by regulations, microcrystalline cellulose has a wide safety margin.

5. Q: How should different particle size grades of E 460(i) be selected when developing tablets or capsules?

A:(1) Fine grades (e.g. 15–65 µm): Good compactibility and high tablet hardness, but somewhat poorer flowability. Suitable for wet granulation and small tablets requiring high hardness.

(2) Medium grades (around 130 µm): Offer a good balance between flowability and compactibility and are commonly used for direct compression.

(3) Coarse grades (170–250 µm): Provide the best flowability and are suitable for high-speed tableting and high-density formulations.

Selection should take into account both the API particle size and the processing characteristics of the equipment.

6. Q: Does E 460(i) affect chromatography or separation experiments?

A: When used as a packing or support material, microcrystalline cellulose itself is chemically inert and has stable polarity. It generally does not interact strongly with most neutral or weakly polar analytes. However, it may degrade under high pH, strong oxidising conditions or strongly acidic conditions, so such conditions should be avoided to remain within its stability range.

7. Q: What are the recommended storage conditions for E 460(i)?

A: Pharmacopoeias and supplier information generally recommend storing microcrystalline cellulose in tightly closed containers, in a cool and dry place, protected from moisture and odour contamination. Under appropriate storage conditions, it is quite stable and typically has a shelf life of several years.

Aladdin: https://www.aladdinsci.com/