In short: The decision here is usually solubility, not percentage. Standard curcumin at 95% is fat-soluble and disperses poorly in water; the water-soluble grade is standardised at a much lower figure precisely so it can be used in beverage and liquid formats. Compare the two on the format you are actually filling, not on the headline number.
Botanical identity and general specification
| Botanical identity | Curcuma longa L. |
|---|---|
| Plant part | Root / rhizome |
| Marker family | Curcuminoids (curcumin, demethoxycurcumin, bisdemethoxycurcumin) |
| Shelf life | Two years when stored properly |
Compare Available Grades
3 commercial grades are available. The table below lists the declared marker, the assay method, a representative batch and the routine physical parameters for each.
| Grade | Plant part | Specification | Method | Representative batch | Particle size | Loss on drying | Sulphated ash |
|---|---|---|---|---|---|---|---|
| Curcumin Extract Powder 95% | Root / rhizome | Curcumin 95% by UV (representative result 95.11%) | UV | LXJH250318 (manufactured 18 May 2025) | 98% through 80 mesh | ≤ 5.0%; result 3.08% | ≤ 5.0%; result 2.13% |
| Curcumin Extract Powder 30% Curcumin | Root | Curcumin 30% by UV (result 30.11%) | UV | LXJH200311 | 98% through 80 mesh | ≤ 5.0%; result 3.58% | ≤ 5.0%; result 3.73% |
| Water-Soluble Turmeric Extract Powder 2% | Root | Standardized assay 2% by HPLC (result 2.23%) | HPLC | LXHJ201025 | 98% through 80 mesh | ≤ 5.0%; result 3.56% | ≤ 5.0%; result 4.42% |
Curcumin Extract Powder 95%
Curcumin Extract Powder 95% is a Fine orange powder standardised as follows: Curcumin 95% by UV (representative result 95.11%), determined by UV. The representative batch is LXJH250318 (manufactured 18 May 2025), milled to 98% through 80 mesh. Loss on drying is ≤ 5.0%; result 3.08% and sulphated ash is ≤ 5.0%; result 2.13%.
Botanical identity for this grade is Curcuma longa L., plant part Root / rhizome.
Curcumin Extract Powder 30% Curcumin
Curcumin Extract Powder 30% Curcumin is a Fine orange powder standardised as follows: Curcumin 30% by UV (result 30.11%), determined by UV. The representative batch is LXJH200311, milled to 98% through 80 mesh. Loss on drying is ≤ 5.0%; result 3.58% and sulphated ash is ≤ 5.0%; result 3.73%.
Botanical identity for this grade is Curcuma longa L., plant part Root / rhizome.
Water-Soluble Turmeric Extract Powder 2%
Water-Soluble Turmeric Extract Powder 2% is a Fine saffron-yellow powder standardised as follows: Standardized assay 2% by HPLC (result 2.23%), determined by HPLC. The representative batch is LXHJ201025, milled to 98% through 80 mesh. Loss on drying is ≤ 5.0%; result 3.56% and sulphated ash is ≤ 5.0%; result 4.42%.
Botanical identity for this grade is Curcuma longa L., plant part Root / rhizome.
Grade comparison: curcumin extract powder
| Your requirement | Grade to specify | Why |
|---|---|---|
| Capsule or tablet, dose-efficient | 95% Curcumin | Highest declared curcumin content; note it is fat-soluble and needs a formulation strategy for absorption |
| Capsule or tablet, cost-sensitive | 30% Curcumin | Lower declared content at a lower cost per kilogram; same marker and method family |
| Beverage, sachet or liquid format | Water-Soluble Turmeric 2% | Supplied for water dispersion; the lower percentage is a consequence of making it water-soluble, not a downgrade |
Buyer Decision Guide
Work through these in order, because each one narrows the next:
- Start from the claim, not the percentage. Identify which marker your label or customer specification names. A grade that declares a different marker is a different product, whatever its headline number.
- Fix the assay method in writing. UV and HPLC results are not interchangeable for the same material. State the method you require on the specification.
- Ask for the batch, not the sheet. A specification describes a grade; the COA describes the batch you will actually receive. Require the batch number to appear on the packing list.
- Check the routine parameters too. Loss on drying and sulphated ash tell you about process consistency. A result far outside the representative range is worth questioning even if the marker value is on target.
- Confirm mesh size against your process. Particle size affects blending, tabletting and hydration behaviour, and it can usually be adjusted if you state your requirement up front.
Qualification and COA Review
Every grade on this page is produced at the same certified manufacturing site, and each batch is released against its own certificate of analysis. When you review the COA, confirm four things: the batch number matches your order documents; the assay method is the one you specified; the marker result sits inside the declared limit; and the physical parameters (particle size, loss on drying, sulphated ash) are reported rather than left blank.
For first orders, requesting a retention sample alongside the shipping documents makes incoming inspection considerably easier.
Certification coverage for this product line
Botanical extract powders in this range are produced at the certified Zhashui site of Shaanxi Longsheng Biotechnology Co., Ltd., which holds five third-party-issued certificates: FSSC 22000 (certificate CN26/00005265, issued by SGS United Kingdom Ltd, valid 13 Jul 2026 – 12 Jul 2029), ISO 22000:2018 (CN26/00005266, issued by SGS United Kingdom Ltd, valid 13 Jul 2026 – 12 Jul 2029), SGS cGMP (CN26/00005948, valid 12 Aug 2026 – 12 Aug 2027), Star-K Kosher Pareve (account NCZSI67Q, valid through 31 Mar 2027) and Halal (3391260000, issued by Shandong Halal Certification Service, valid 26 Jun 2026 – 25 Jun 2029). The original certificate documents are published on the certificate register for Shaanxi Longsheng Biotechnology.
Frequently Asked Questions
Should I choose 95% curcumin or the water-soluble grade?
Choose from the format. A 95% curcumin grade carries the highest declared curcumin content but is fat-soluble, so it disperses poorly in water-based products. The water-soluble grade is standardised at 2% by HPLC so that it can be used in beverage and liquid formats. The right answer depends on what you are filling, not on which number is larger.
Why is the water-soluble grade assayed by HPLC while the 95% and 30% grades are assayed by UV?
They are different materials made by different processes, and the specification for each states the method actually used. Because UV and HPLC results are method-dependent, do not compare a UV percentage from one grade directly against an HPLC percentage from another.
What does the 77:17:6-type curcumin ratio mean?
Natural curcuminoid extract contains three related compounds. The ratio describes the approximate proportion between them and is documented on the certificate. If your claim or your customer’s specification depends on a particular ratio, state it as a requirement so it is confirmed in writing.
Is the curcumin content stable over the declared shelf life?
These grades carry a two-year shelf life when stored properly. Curcuminoids are sensitive to light and to prolonged exposure to air, so keep the material sealed and protected from light. If a batch has been open for a long period, re-test before production use.
Do these grades report residual solvent?
The extraction is a controlled solvent process and residual solvent is tested as part of the specification package. Ask for the COA of your batch and confirm which screens it reports, particularly if your destination market sets its own residual solvent limits.
Can the 95% grade be made water-dispersible?
Dispersion is a formulation question. If you need a water-dispersible curcumin at high concentration, raise it explicitly when you inquire, stating your target curcumin content and the format you are filling, so it can be matched to the appropriate product rather than assumed.
What is the particle size of the curcumin grades?
All three are milled at 98% through 80 mesh. If your blend or capsule filling process needs a different particle size distribution, specify it in the inquiry.
How do I compare two suppliers quoting the same curcumin percentage?
Compare the method first — UV and HPLC results are not directly interchangeable — then compare the representative batch result, the batch number and the loss on drying and ash values. A percentage without a stated method and an identified batch is not enough to compare on.
View the compared product grades
These current product pages correspond to grades named in the comparison above. Confirm the offered-lot specification before choosing a grade for your inquiry.
Request a Grade Comparison
Send the grade you are considering, your target marker value, the method you need it declared by, and your destination market. We will reply with the matching specification, a representative batch COA and a sample offer.
Practical next step: send your requirement as an inquiry, or write to gshuai@long-bio.com.