Cold-chain instructions belong in the enquiry

An antibody conjugated to an enzyme, the sort used on a western blot, is still a liquid in a small tube when it leaves a seller. Whether it is still fit for that blot when it reaches your bench depends on a setpoint, a coolant, a record of the trip, a person who acts if the record is bad, and a human being present to receive the box. Those five items belong in the enquiry, not in a footnote after the price line you are not writing here. The sourcing habit is how to write a laboratory sourcing enquiry. The storage science after the box is inside your building is storing biological samples from fridge to freezer. Send the cold-chain lines through laboratory procurement or, for a university group, academic research. A scope can be discussed by quotation request or contact.

The shipment this page walks through

You are ordering that conjugated antibody for a research blot. The manufacturer's product instructions state a storage class. For many such antibodies the qualified storage is a refrigerated band or a frozen band; you write the one this product's instructions name, and you do not upgrade it because a colder freezer happens to be free. The enquiry is how you tell a seller, before a quotation is written, what "arrived well" will mean.

This is one application. The same five fields fit an enzyme, a ligase, a competent-cell shipment, or a box of samples you are sending out for a study. The fields do not change just because the label does.

Why the enquiry is the cold-chain document

A cold chain is a chain of responsibilities. Each handoff can only keep a setpoint it has been told about. If the setpoint lives in your head, the packer, the carrier, and the evening receptionist do not have it. Writing it into the enquiry makes it something the quotation can agree to, exception, or refuse. A refusal is useful. It tells you this seller will not support the class, and you can stop before a warm box teaches you the same lesson.

The physical idea is ordinary heat flow. Coolant absorbs heat leaking into the shipper. A logger records whether the leak won. Neither object chooses a policy. You choose the setpoint, the coolant class, whether a logger is required, who reads it, and when the building can accept the shipper. Packing with dry ice is a separate practical note for one coolant class. Use it when the product's class actually needs that coolant. Do not reach for it because it sounds more serious than gel packs.

Setpoint and coolant class

Write the setpoint as a range. If the instructions say 2 °C to 8 °C, that is the range. If they say store at −20 °C, write that class and the manufacturer's wording about thawing. Follow the product instructions and your SOP. A specification that says "cold chain" allows a quotation to answer with either class and call them the same offer.

Coolant class follows the setpoint. Gel packs conditioned for a refrigerated band are a different tool from dry ice used for a frozen band. Name the class you require, and ask the quotation to state which coolant it will use. You do not need to dictate the seller's box design in millimetres. You do need them to agree that the coolant matches the setpoint you named. Where a dangerous-goods rule applies to the coolant, the carrier's rules apply. The IATA dangerous goods programme is a public pointer. It is not a packing instruction for your parcel.

Logger, yes or no

Decide before you enquire. A logger is a small recorder that travels with the shipper and later shows the temperature trace. Say yes when the material is expensive to repeat, hard to replace, or known to fail quietly after a warm interval. Say no only when you have a reason, and write the reason, so a later reader knows the omission was a choice.

If yes, say what you will accept as a pass: the trace stayed inside the setpoint, or any excursion was inside a limit the manufacturer states. Say the file format or the paper printout you can actually read. A logger you cannot download is a decoration. Ask the quotation to confirm that a logger will be included and that the trace comes to you with the box.

Who acts on an excursion

Name a role. The receiving laboratory quarantines the shipper, reads the logger, and compares it with the limit. The sender is told before the vial is released to the assay. If the trace fails, the vial is not tipped into an experiment "to see if the antibody still works" on a precious lysate. That experiment spends the sample to answer a shipping question. Quarantine, notify, and let the written rule decide whether the lot is replaced.

Write the rule in the enquiry so the quotation can agree that a failed trace is not an accepted delivery. If the seller will not agree, you still keep your own quarantine rule. You just know the replacement conversation will be harder, and you have learned that before the box exists.

Receiving hours

State the hours a named person can take the shipper from the dock into the refrigerator or freezer that matches the setpoint. Include the place. A delivery to a central post room at a time when nobody will walk it to the cold room is a break in the chain you designed. Ask the quotation to agree to those hours, or to state a different window so you can staff it. Do not leave hours as a local secret.

The afternoon the logger fails

The box arrives inside the hours. The logger shows a stretch above the refrigerated setpoint. The branch is already written: quarantine, do not aliquot, tell the person you named, compare the stretch with the manufacturer's excursion statement if they provide one. If they provide none, you do not invent a safe duration. The lot stays out of the blot until a written decision replaces the hope that antibodies are sturdy. Record the trace in the same file as the certificate. Then return to the quotation and ask whether this delivery met the acceptance line they agreed. Storage after a good receipt is the other article: fridge, freezer, and the alarms your building actually has.

Failure modes

The first is splitting refrigerated and frozen in the same shipper without a written reason. One setpoint loses. Specify one class per shipper unless the seller states a qualified split and you understand it.

The second is a logger that is yes on the enquiry and absent on the box. That delivery has not met the line. Quarantine and ask, rather than inferring that the gel packs "look cold".

The third is receiving hours written for the working day and a dock that in practice closes earlier. Walk the hours with the people who actually stand there before you put them in the file. An optimistic clock is an excursion plan.

Safety and research use

Dry ice, gel packs, and a biological reagent each have handling rules. The institution decides containment for the material. Public references such as the WHO laboratory biosafety manual and the CDC BMBL describe institutional biosafety thinking. They do not clear your shipment. A cold box is not a diagnostic kit, and a successful blot later is not evidence that an excursion was harmless. You already chose not to test harmlessness on the real samples.

Heat at the door

In a hot season the minutes between the vehicle and the cold room are part of the chain. Shade, a direct walk, and a person who is actually on the roster matter more than a thick catalogue of packaging. Write the hours when that walk can happen. If the building loses power, the storage you are walking toward needs the alarm and the backup practice your facilities group already owns. Do not add a fictional transit duration to the enquiry. Add the setpoint and the hours.

What the quotation should answer

Ask it to repeat the setpoint, the coolant class, logger yes or no, the excursion rule it agrees to, and the receiving hours it can meet. A silent line is not a cold chain. Place the enquiry with laboratory procurement or academic research, through contact or a quotation request. A scope can be discussed. When the box comes, the person on the roster compares the logger with the line you both signed, and only then does the vial earn a place in the refrigerator or the freezer your storage SOP names.