Bai Zhu Buyer Guide: How to Specify Atractylodes macrocephala for Bulk Purchase

Bulk buyers should define the exact botanical identity, dried rhizome as the plant part, required processing form, whole or sliced material, measurable commercial grade, sulfur requirement, testing scope and batch documentation before ordering Bai Zhu. Bai Zhu and Cang Zhu are separate commercial and pharmacopoeial materials, so the Latin botanical name should appear in the purchase specification.

What Buyers Should Specify Before Ordering Bai Zhu

Confirm the Botanical Identity

Bai Zhu corresponds to Atractylodis Macrocephalae Rhizoma, sourced from Atractylodes macrocephala Koidz., with the medicinal part being the dried rhizome.

“Atractylodes” or “Atractylodes root” alone is too broad for a purchase specification. The genus includes different materials used in trade, and Bai Zhu is specified as a rhizome rather than a root.

A clear purchase specification should use:

Common name + Latin botanical name + plant part + processing status

Example:

Bai Zhu / White Atractylodes Rhizome — Atractylodes macrocephala Koidz. — Dried Rhizome, [Raw / Bran-Fried / Stir-Fried]

Bai Zhu vs Cang Zhu: Do Not Treat Them as Interchangeable

The RFQ, PO, specification and COA should identify the material by both common name and Latin botanical name.

International standards treat these as two separate materials, not two grades of one material. ISO 13615:2024 covers Atractylodes macrocephala rhizome (Bai Zhu) specifically. A companion standard for Cang Zhu — ISO/CD 25825, covering Atractylodes lancea and Atractylodes chinensis — is still at Committee Draft stage as of this writing. That means no ISO standard for Cang Zhu can be cited yet; a supplier claiming “ISO-compliant Cang Zhu” is not referencing a published document.

Cang Zhu is a separate material with its own specification; see our Cang Zhu (Atractylodes rhizome) product page if that is the material you need.

Origin and Processing Status

Origin

Bai Zhu is commercially produced in several regions of China. For procurement purposes, the more important distinction is whether origin is informational or controlled.

Informational origin — the supplier states the growing region, but it is not contractually fixed.

Controlled origin — the buyer specifies the region in writing and requires notification before any change.

Origin supports traceability and supply consistency; it does not independently prove analytical quality.

Raw vs Processed Bai Zhu

“Bai Zhu” alone does not confirm processing status. The required form should be written into the RFQ, PO and approved specification because processing affects the commercial material supplied.

Whole Rhizome vs Cut Slices

For whole rhizome, agree the required size range and surface acceptance criteria rather than assuming a standard dimension.

For slices, specify an [agreed thickness range] and [agreed size range], together with a [buyer-approved tolerance] for broken pieces and fines.

The dimensions should reflect the buyer’s application and the supplier’s confirmed cutting capability rather than an assumed universal grade.

Define Commercial Grade With Measurable Criteria

Commercial grade labels such as Grade I, Premium and Selected are generally market- or supplier-defined rather than one universal Bai Zhu grading system. For how to convert grade language into measurable, enforceable purchase-order criteria, see our Chinese Herbal Slice Grades guide.

Appearance, Cross-Section and Sulfur Requirements

What Visual Review Can Check

Cross-section colour and visible oil chamber (油室) features are commonly used to help distinguish Bai Zhu from Cang Zhu, though visual inspection alone is not proof of botanical identity or sulfur status. Colour alone should not be used to judge sulfur treatment. For general sulfur-fumigation risk and how it affects colour and COA acceptance, see our sulfur-free sourcing guide.

Visual review can cover:

• Exterior condition
• Shape
• Slice uniformity
• Cross-section colour
• Visible oil chamber features where relevant
• Insect damage
• Mold
• Foreign matter

These visual features can help distinguish Bai Zhu from Cang Zhu, though inspection alone does not prove botanical identity or sulfur status. Colour alone should not be used to judge sulfur treatment. For general sulfur-fumigation risk and how it affects colour and COA acceptance, see our sulfur-free sourcing guide.

What to Check on a Bai Zhu COA

For general COA structure and how to read a batch document, see How to Read Chinese Herb Test Reports and the Certificate of Analysis guide.

Atractylenolides may be included as analytical markers where required by the buyer, but they should not automatically be treated as mandatory quantitative fields for every Bai Zhu order.

For general COA structure and batch matching, see the Certificate of Analysis guide.

Sample Approval and Batch Consistency

Approve the sample together with a written specification, not the sample alone. Agricultural materials naturally vary in shape and colour between batches, but botanical species, processing status, cut and analytical scope should remain within agreed requirements rather than match a reference sample visually point-for-point. For the full workflow, see Botanical Ingredient Sample Approval.

See the botanical ingredient sample approval guide for the broader approval process.

Common Procurement Red Flags

Bai Zhu Purchase Specification Template

For general cut and thickness options, see Custom Cutting and the Chinese Herbal Slices Specification Guide.

FAQ

Is Bai Zhu the same as Cang Zhu?

No. Bai Zhu (Atractylodis Macrocephalae Rhizoma) comes from Atractylodes macrocephala Koidz., while Cang Zhu (Atractylodis Rhizoma) comes from Atractylodes lancea or Atractylodes chinensis. They are separate commercial and pharmacopoeial materials and should not be treated as interchangeable trade terms.

What botanical name should be used when ordering Bai Zhu?

Use Atractylodes macrocephala Koidz. and specify dried rhizome together with the required processing status. The botanical name confirms the species, while the plant part and processing status define the exact commercial material required for the order.

Should buyers order whole Bai Zhu or slices?

It depends on downstream requirements. Whole rhizome allows further cutting after purchase, while slices provide a defined ready-to-use material form. In either case, size, thickness, uniformity and breakage tolerances should be written into the specification rather than assumed.

Does white or light colour prove Bai Zhu is sulfur-free?

No. Colour is a visual acceptance field and does not confirm sulfur treatment. Neither lighter nor darker material proves sulfur status on its own. Where sulfur control is required, use the agreed processing requirement together with appropriate batch-linked sulfur dioxide verification.

Are Grade I and Premium universal Bai Zhu grades?

No. These terms are generally supplier- or market-defined rather than fixed cross-industry standards. Buyers should convert grade names into measurable criteria such as size, thickness, uniformity, broken pieces, fines and foreign matter.

What should buyers compare between an approved sample and the production batch?

Compare botanical identity, processing status, product form, cut and thickness, surface and cross-section condition, broken pieces, fines, foreign matter, packing and label. Natural variation in shape and colour is expected; controlled specification fields should remain within agreed tolerances.

Define Your Bai Zhu Specification Before Ordering

Send your required botanical identity, processing status, product form, cut, testing scope, packing and destination market for review. Aile Herb can confirm feasibility and provide samples and batch documentation against the agreed specification.

Discuss Your Requirement