If you’re buying Di Long (dried earthworm slices) for decoction pieces, extracts, or finished blends, here’s the blunt truth: you don’t have a quality spec until you can reject a lot with it. And with Di Long, three specs decide most of the headaches:
This isn’t “nice to have.” If you don’t lock these in your PO, you’ll get spec creep, then you’ll fight about what’s “acceptable,” and your warehouse ends up holding inventory nobody wants.
If you want a product reference point, start here: Dried Earthworm Cut (Di Long) bulk supplier. It’s also useful to browse the broader Animal & Mineral Chinese medicinal category so your team aligns on how this item gets positioned.
Cleaning isn’t just “looks clean.” In Di Long, cleaning is basically how you control sand load, and sand load shows up as ash (especially acid-insoluble ash).
A commonly cited pharmacopoeia-style requirement for Di Long sets foreign matter ≤ 6%.
In real procurement terms: if your incoming QC has to pick out too much dirt, fibers, or random bits, that lot becomes slow to use, and your operators start doing “extra cleaning” that nobody budgeted time for.
Moisture is where storage problems begin. The same monograph-style spec lists moisture ≤ 12.0%.
If moisture runs high, you’ll see more clumping, higher mold risk, and odor that “blooms” when you crack a bag.
This is the sand scoreboard. The limits often cited are:
A patent describing a one-step Di Long slice process even calls out the pain point directly: traditional methods can leave sand in the body and push ash over spec, so they use rolling/pressing + washing + screening, then dry at 60–70°C to a moisture range (they mention 8–12%) and show an example lot with total ash 9.1%.
For many herbal materials, the PRC Pharmacopoeia (2020) framework commonly uses AFB1 5 μg/kg and total aflatoxins 10 μg/kg as thresholds in specific contexts.
Even when Di Long isn’t your highest-risk item, buyers still ask for it because downstream customers (supplement factories, hospitals, importers) don’t want surprises.
Cut size sounds boring until you run decoction, extraction, or blending at scale. Then it becomes everything.
A prepared-slices quality standard spells out typical segment specs:
For Di Long, many buyers choose 10–15 mm as the default because it handles well (less dust) and still extracts fine.
Same standard also states abnormal slices shouldn’t exceed 10%.
This matters because “abnormal” often turns into:
Here are two real-world (non-fictional) patterns you’ve probably seen:
Let’s not pretend: Di Long has a natural smell profile. The problem is when it crosses from “normal” into customer-rejection territory.
A prepared-slices standard literally says you can assess odor directly, and if needed, use hot water to moisten the sample and check.
That’s a big hint: odor can change a lot once water hits it, so your acceptance test should mirror how the product gets used.
A Heliyon-indexed study (via PubMed) reports that when Pheretima is exposed to hot water, fishy odor increases sharply, and TMA exposure increased by ~2–3× after warm soaking.
So if you only sniff a dry bag and call it “fine,” you’re missing the moment your end user actually judges it.
Below is a simple spec framework you can copy into your PO/QA agreement. I’m mixing “hard limits” (numbers) with “buyer-defined sensory gates” (because odor acceptance is market-driven).
| Spec item (keyword) | Suggested acceptance | How you test (fast) | Why you care | Evidence / reference |
|---|---|---|---|---|
| Foreign matter | ≤ 6% | Pick + weigh | Too much hand-sorting = delays + disputes | Monograph-style limits |
| Moisture | ≤ 12.0% | Moisture test | High moisture = mold risk + odor bloom | Monograph-style limits |
| Total ash | ≤ 10.0% | Ash test | Sand/dirt control proxy | Monograph + process notes |
| Acid-insoluble ash | ≤ 5.0% | Acid-insoluble ash | More direct “sand” signal | Monograph-style limits |
| Segment length | 10–15 mm (or 5–10 mm if you want “short”) | Caliper + sieve grading | Consistent extraction + lower dust | Slice-size standard |
| Abnormal slices | ≤ 10% | Visual count by weight | Controls chips/strings/crush | Slice-size standard |
| Odor check (dry) | Buyer-defined pass/fail | Bag-open sniff | First impression gate | Sensory method allowed |
| Odor check (hot-water) | Buyer-defined pass/fail | Hot-water wetting sniff | Matches real use; catches “odor bloom” | Hot-water check + odor research |
| Drying control (process) | 60–70°C; moisture target range | Process record review | Helps stabilize odor + moisture | Processing method example |
| Aflatoxins (if required) | AFB1 5 μg/kg; total 10 μg/kg | Third-party COA | Import/compliance confidence | CP2020-style threshold references |
Small but important: write your odor rule like a grown-up contract line. Example:
If you’re buying in volume, do these three things and you’ll avoid 80% of the drama:
GuoCao talks openly about lot mapping and traceability here: Traceability: batch control and lot mapping.
If you’re sourcing Di Long for regulated or picky channels, the manufacturing setup matters.
GuoCao states it runs a GMP-certified facility, meets ISO 22000, and uses third-party testing for items like heavy metals, pesticides, and microorganisms.
It also positions factory-scale output (2,500 tons annually) across categories and highlights global shipment support.
If you’re doing private label or custom packs, skim:
And if you’re building a broader product line beyond Di Long, these are useful navigation hubs:
Patents aren’t “quality standards,” but they show what serious processors worry about.
This one emphasizes:
Buyer takeaway: if your supplier can’t clearly explain how they control sand and drying, you’ll see it later as ash spikes, funky smell, and unstable storage.
This Heliyon/PubMed-indexed work basically validates what buyers already feel:
So your odor spec should include a hot-water wetting check, not just a dry sniff. Otherwise, you’re testing the wrong moment.
