How is freeze-dried jackfruit produced and controlled so the bulk lot matches the approved sample?
A container of freeze-dried jackfruit matches the approved sample when six steps run to fixed numbers, from 18–24° Brix at intake to release at moisture ≤4.0% and aw ≤0.25 and a packing room at RH ≤35–40%. Lock them, with a pre-shipment sample, before the first lot. Supplier checks start in the bulk buying guide.
The six control points:
| Step | Control point |
|---|---|
| Fruit intake | 18–24° Brix, with cull rates adjusted by season |
| Cutting | Mechanical cut before freezing, ≥85% on size |
| Freezing | −35 to −40 °C blast freezing |
| Drying | 18–24 hours under deep vacuum, shelf heat capped at 50–55 °C |
| Release | Factory target of moisture ≤4.0% and water activity ≤0.25, inside the contract limits of ≤5.0% and ≤0.30 |
| Packing | Room held at 20–24 °C and RH ≤35–40% |
When a lot drifts from the sample, the cause is almost always one of these steps. This guide shows the standard for each one, how to use the pre-shipment sample without delaying your booking, and how to inspect the container on arrival with a method that holds up in a dispute.
How is freeze-dried jackfruit made, and what standard applies at each step?
| Step | FruitBuys operating standard | Drift risk | Control |
|---|---|---|---|
| 1. Intake and sorting | 18–24° Brix, checked with a hand refractometer | Rainy-season fruit drops below 18°, watery and bland | Cull rate raised from 5–8% to 12–18% in the rainy season |
| 2. Bulb separation and latex isolation | Bulbs separated by dry-strip handling; contact with core latex prevented before a sanitizing rinse | Latex residue leaves a bitter, gummy film; it does not dissolve in water | Oiled blades strip latex at the core first; quick ozone or chlorine rinse, then immediate surface drying before traying |
| 3. Cutting | Mechanical cutters: 10 × 10 mm or 5–6 mm dice, or whole bulbs | Crushing after drying creates dust and irregular pieces | Cut before freezing; ≥85% on size |
| 4. Blast freezing | Forced-air freezing at −35 to −40 °C for 6–8 hours | Slow freezing grows large ice crystals that tear the cells | Product core confirmed at ≤−30 °C before loading the dryer |
| 5. Freeze-drying | Vacuum <0.5 mbar (below 50 Pa); cycle 18–24 hours; shelf heat ≤50–55 °C | Above 60 °C sugars brown and scorch; ending early leaves soft pieces | End-of-cycle sensors; released at moisture ≤4.0%, aw ≤0.25 |
| 6. Grading and packing | Packing room 20–24 °C, RH ≤35–40%; PET/AL/LLDPE bags | Fruit takes up moisture within about 30 minutes in humid air | Batch exposure kept under 20 minutes; light vacuum and desiccant before sealing |
How do season and ripeness change a bulk lot?
They are the biggest single cause of drift between a bench sample and a 5,000 kg container. Raw fruit does not grow to a laboratory standard.
- Dry season, November to May. Southern Vietnamese jackfruit reaches its highest sugar, 20–24° Brix, with firm, drier flesh. A standard 5–8% cull at intake removes bruised and undersized bulbs.
- Rainy season, June to October. Heavy rain raises the water content of the fruit. Sugar falls toward 17–19° Brix and the flesh softens. Bulbs below 18° are culled before they reach the dryer, so they cannot come out pale, bland or collapsed. That pushes the cull rate up to 12–18%.
That higher cull is what keeps the dried product golden and evenly sweet, and it is priced through the seasonal terms you agree. It is also why the ratio of fruit to finished product moves with the season; see how much fresh jackfruit makes 1 kg of freeze-dried.
Procurement rule: if your sample was signed in March and your container runs in August, expect seasonal variation. The aroma stays clean and tropical, but colour and sweetness shift slightly. Write the colour and taste tolerance into the purchase specification, instead of assuming the fruit is identical all year.
Why can’t the freeze-drying cycle be rushed?
Because jackfruit carries far more sugar than berries or apples, and sugar is what scorches.
- Blast freezing at −35 to −40 °C. Freezing the bulbs within 6–8 hours forms very small ice crystals inside the cells. Slow freezing grows large, sharp crystals that puncture the cell walls. The fruit then shrinks and turns leathery in the dryer instead of setting into a crisp, porous structure.
- Sublimation over 18–24 hours. The ice is removed under deep vacuum, below 0.5 mbar, while the shelves are gently heated. Shelf temperature is capped at 50–55 °C.
- The thermal risk. Pushing shelf heat above 60 °C to shorten the cycle caramelises the natural sugars. The fruit turns dull brown, and the tropical aroma picks up a burnt note.
Release is decided by the end-of-cycle readings, moisture ≤4.0% and aw ≤0.25, not by a production deadline.
What this means for you: when comparing suppliers, ask for the drying cycle time and shelf temperature limit. A cycle much shorter than 18 hours for whole jackfruit bulbs usually means higher heat, and the colour will show it.
What should the approved, pre-shipment and retained samples include?
| Sample | Who holds it | Why it matters |
|---|---|---|
| Approved sample, signed and dated, with its specification sheet | Buyer and FruitBuys, sealed | Physical reference for colour, cut, crunch and taste |
| Pre-shipment sample (PSS) | Sent to the buyer before balance payment | Shows the actual production lot before it sails |
| Retained sample from every container lot | FruitBuys, at 20–22 °C and ≤50% RH, for 24 months, covering the full shelf-life window | Settles any later question by testing the same lot |
The specification sheet that goes with the approved sample states:
- cut size and tolerance;
- release moisture and water activity;
- the fines limit through a 3 mm sieve: ≤3–5% for dice, ≤5–8% for whole bulbs and pieces;
- the bag and carton format.
The pre-shipment sample protocol. After the lot is packed and released, cartons are sampled across the lot. A 100–200 g composite sample, split into two sealed foil pouches with desiccant (one for your sensory check, one kept sealed for your laboratory), goes by international courier (DHL or FedEx) within 24–48 hours of completion, while the container is being arranged. Your QA team has a 3–5 working day window to check appearance, crunch and aroma before final payment. This avoids holding a booked container for two weeks while samples travel, and the demurrage and detention charges that come with it.
What COA comes with a lot, and what happens below a full container?
Full-container orders ship with a lot release COA from an ISO/IEC 17025 laboratory covering six parameters:
- moisture
- water activity
- total plate count (≤10⁴ CFU/g)
- yeasts and moulds (≤10² CFU/g)
- E. coli (<10 CFU/g)
- Salmonella (not detected in 25 g)
Lead, arsenic and aflatoxin are covered by the periodic independent baseline audit.
Trial and LCL orders carry a free in-house release QC log for the batch, backed by FruitBuys’ periodic third-party baseline reports. Independent batch testing is arranged before dispatch at net laboratory cost and credited back in full against your first full-container order.
How to read these reports and which limits to sign is covered in what moisture and water activity freeze-dried jackfruit should have.
Which changes should the supplier tell you about?
Agree a short change-control clause. The supplier must notify you before production of any of these:
- a change of growing region or variety;
- a change of cut size, cutter or grading method;
- a change of drying cycle, shelf temperature limit or release limits;
- a change of bag film, bag size or carton;
- a change of production site, line or testing laboratory.
None is a problem in itself. Problems start when a buyer finds out only after the container lands.
How do you inspect a container of freeze-dried jackfruit on arrival?
Use a statistically valid sample, not the first carton at the door. Opening one or two dented cartons near the doors does not represent a 550-carton consignment.
Sampling plan: follow ISO 2859-1. For a lot of about 550 cartons:
- general inspection level II calls for 80 cartons;
- general inspection level I calls for 32 cartons.
Level I is the practical choice for a routine arrival check. Draw cartons from the front, middle and rear of the container.
Why Level I rather than Level II? Level II means opening 80 of about 550 cartons. Cutting open 80 barrier bags in an unconditioned warehouse at RH above 60% exposes roughly 15% of the cargo to the very moisture pickup you are testing for. Level I (32 cartons), sampled quickly, measured for aw and resealed within minutes, gives a sound statistical check without damaging the lot.
On each sampled carton, check:
| Check | Accept | Hold and query | Reject |
|---|---|---|---|
| Documents | Lot code identical on bag, carton, COA and invoice | Minor typo, lot still traceable | Lot code missing or different on the COA |
| COA results | All six release parameters within limits | A result at the limit | Any result outside the limits |
| Carton condition | Intact, dry | Dented cartons with intact bags | Wet or crushed cartons with split bags |
| Bag seal | Airtight, intact | Single punctured bag; isolate and test | Multiple soft or sticky bags in one carton |
| Water activity | ≤0.28 inside a sealed bag | 0.29–0.35 | >0.35 across several cartons |
| Texture | Crisp, snaps cleanly | Slightly soft in one bag | Soft, sticky or clumped across cartons |
| Colour and aroma | Within agreed tolerance of the approved sample | Paler or darker, taste within tolerance | Browned, burnt or fermented |
| Cut and fines | ≥85% on size; fines within the agreed limit | Fines slightly above limit | Wrong cut, or fines far above the limit |
The water activity rule. Product that measures aw ≤0.28 inside a sealed bag is sound. An isolated carton above 0.35 points to a bag punctured in transit or a carton opened at inspection, not a failed production lot. Several cartons above 0.35 across the container is a lot problem and grounds to reject.
Standard claim windows are 14 days from container unloading for packaging, appearance, breakage and water activity, and 30 days for laboratory results. Before any claim, photograph cartons, bags and lot codes. Keep the affected bags sealed, and compare against the retained sample from the same lot. Many “soft product” claims trace back to a customs inspection or a warehouse that opened cartons and closed them loosely; see how bulk freeze-dried jackfruit is packed and loaded.
How long does production take?
A 20 ft container takes 20–30 days after deposit. Lots are made to order: drying is scheduled against your freight booking, and the lot ships soon after packing, with almost all of its 12-month shelf life still ahead.
The trade-off is planning. A made-to-order lot cannot be pulled from stock tomorrow. Place repeat orders against your sales forecast.
When does a sample not predict the bulk lot?
- The sample was hand-picked. A few hundred grams can be chosen bulb by bulb; a container cannot. Ask for a sample drawn from a production batch.
- The season changes between sample and order. Agree colour and taste tolerances.
- The product will be used differently. A sample eaten from the bag says little about dice inside a cereal bar; see freeze-dried jackfruit formats for food manufacturing.
For supplier selection and forms, see the freeze-dried jackfruit buyer guide.
Set up the approved sample and acceptance terms
Tell us your cut, channel, arrival season and receiving process. We will send a production-drawn sample with its specification sheet, and agree tolerances, the pre-shipment sample and the arrival inspection plan before the first lot is made.
Email [email protected] · WhatsApp Export +84 919 739 589
FAQ
Why does a freeze-dried jackfruit lot differ from the sample?
Mostly because of season and ripeness. Rainy-season fruit is wetter and less sweet, so FruitBuys raises the cull rate to 12–18% to hold colour and taste.
How is freeze-dried jackfruit dried?
Blast frozen at −35 to −40 °C, then freeze-dried for 18–24 hours under vacuum below 0.5 mbar, with shelf heat capped at 50–55 °C.
Will I see the production lot before it ships?
Yes. A 100–200 g pre-shipment sample, in two sealed pouches, goes by courier within 24–48 hours of completion, before final payment.
How many cartons should I inspect on arrival?
Follow ISO 2859-1. For about 550 cartons, level I calls for 32 cartons and level II for 80, drawn across the container.
What water activity means the product is fine?
0.28 or lower inside a sealed bag. An isolated carton above 0.35 usually means a punctured bag, not a failed lot.
How long does production take?
20–30 days for a 20 ft container after deposit, made to order.
About the author. Udo Nguyen is CEO of FruitBuys Vietnam. He coordinates freeze-dried fruit sourcing, qualified partner facilities and export documentation for importers, food manufacturers and private-label brands.
