Buyer guide

MSC Extracellular Vesicle Collection: Serum-Free Medium or Depleted Serum, and How to Compare the Bottles

An extracellular vesicle (EV) programme can lose months at one purchasing decision: the medium the cells sit in while the vesicles are collected. Serum brings its own vesicles into the sample, and one research group describes switching cells into exosome-free serum for the harvest so the product is not contaminated with bovine exosomes. The alternative is a serum-free collection medium; we list three, in 500 mL bottles. This page is for distributors, resellers and procurement buyers: the routes, what each costs you, how to compare bottles from any supplier, and what to send us.

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The three routes

Route	What you buy	What it costs you	What you must check
Deplete serum in-house	Ordinary serum	Ultracentrifuge time: one group reports spinning serum for about 18 hours at 100,000 g	Whether depletion was complete, batch by batch
Buy depleted serum	Serum sold as exosome-depleted, tested by lot for depletion and culture performance	A premium bottle: a user comment calls the price too high against a normal serum bottle	The depletion test behind each lot
Serum-free collection medium	A 500 mL bottle of serum-free medium, animal origin-free, without phenol red	Wholesale price on quotation	That your cells stay healthy in it through the collection period

The two-phase pattern matters for the order. The same group grew cells to high density with 10% serum, washed them, and only then moved them into the collection condition. So a programme usually buys two media: one to grow the cells and one to collect in. Our stem cell media category page makes the same point for analysis: serum-derived signal can interfere with the readout.

Why programmes take the trouble: mesenchymal stem cells show promise in regenerative medicine but come with challenges, and new research indicates EVs could deliver on that promise with lower risk.

The serum-free collection media, side by side

	Exosome expression medium	Exosome production medium	Exosome expression medium II
Pack	500 mL	500 mL	500 mL
Serum	Serum-free	No serum required	Serum-free
Raw materials	Animal origin-free	Animal origin-free	Animal origin-free
Listed additions	Glucose, glutamine, sodium bicarbonate	Glucose, glutamine, sodium bicarbonate	Glucose, glutamine, sodium bicarbonate
Phenol red	Without	Without	Without
Cells named	None listed	Various suspension and adherent mammalian cells	None listed
Endotoxin	Not more than 1 EU/mL	Not more than 1 EU/mL	Not more than 1 EU/mL
Osmolality, mOsmol/kg	280 to 320	280 to 320	280 to 320
pH	7.0 to 7.4	7.0 to 7.4	7.0 to 7.4
Storage	2 to 8 °C, protected from light	2 to 8 °C, protected from light	2 to 8 °C, protected from light
Shipping class	Blue ice	Blue ice	Blue ice
Shelf life	12 months	12 months	12 months

Read the table as a buyer:

Same listed limits, different price. The three bottles list the same endotoxin, osmolality and pH, yet two of them list at four times the price of the first. The listed limits do not explain the difference, so do not assume the bottles are interchangeable or that the dearer one is better for your cells; ask us for the lot data and we tell you what is available for each.
None is listed for MSC by name. One names suspension and adherent mammalian cells in general, and the other two name no cell type. Plan a test with your own cells before you commit a run.
One freight class. All three ship on blue ice and store at 2 to 8 °C, so they travel with most other media.
Twelve months. The shelf life is 12 months, so buy for the runs you have scheduled, not for the whole project.

The growth phase: MSC media on the same order

MSC medium, 500 mL	Class	Endotoxin	Storage	Shipping
Xeno-free expansion medium, with phenol red	Xeno-free, serum-free, with serum substitute	Not more than 3 EU/mL	-30 to -5 °C	Dry ice
Xeno-free expansion medium, without phenol red	Xeno-free, serum-free, with serum substitute	Not more than 3 EU/mL	-30 to -5 °C	Dry ice
Serum-free basal medium	Animal origin-free, without serum substitute	Not more than 3 EU/mL	2 to 8 °C	Blue ice
Serum-free basal medium, without phenol red	Animal origin-free, without serum substitute	Not more than 3 EU/mL	2 to 8 °C	Blue ice
Serum-free basal medium II	Animal origin-free	Not more than 3 EU/mL	2 to 8 °C	Blue ice
Basal medium II, without phenol red	Animal origin-free	Not more than 3 EU/mL	2 to 8 °C	Blue ice
Serum-free hMSC culture medium	No animal source, without serum substitute	Not more than 3 EU/mL	2 to 8 °C	Blue ice
Serum-free hMSC culture medium, without phenol red	Animal origin-free, without serum substitute	Not more than 3 EU/mL	2 to 8 °C	Blue ice

All eight carry a 12 month shelf life. The xeno-free bottles are frozen items that ship on dry ice, while the others ship on blue ice, so an order that mixes them arrives in two temperature classes and the freight is part of the comparison. The xeno-free bottle lists at about four times the basal serum-free bottle and includes the serum substitute, which the basal bottles are listed without. An MSC dissociation solution without phenol red, in 500 mL, stores at 2 to 30 °C for 36 months and ships at room temperature. For the expansion decision itself see our MSC expansion comparison guide; this page stays with collection.

One caution on labels. A supplier of a defined MSC medium renamed an attachment product from xeno-free to serum-free after finding it did not meet its own xeno-free definition. "Serum-free", "xeno-free" and "animal origin-free" are different claims; ask any supplier which definition applies to each component.

How to choose: a selection list

Decide what the serum question is for you. If the readout cannot tolerate bovine vesicles, ordinary serum in the collection phase is out.
Split growth from collection. Choose a growth medium and a collection medium separately, as the two-phase pattern above shows.
Start with the bottle that costs least to test. The entry collection medium lists at a quarter of the other two.
Run the routes in parallel. Keep your current route and the serum-free route side by side for a few passages and compare cell health and the readout you care about.
Count the isolation step in. Isolating EVs from conditioned medium has its own considerations and challenges, and the medium is the first input to that step.
Plan volume early. Until recently exosome manufacturing was limited to small batches; one developer that put manufacturing first from the outset reached thousand-litre batches.

What to ask any supplier

A researcher working with a company on an MSC-EV treatment writes that, as basic researchers, they struggle to understand what information they need to get for a clinical path. The medium is one of the places where that information starts. Ask every supplier the same questions:

Which cells is the medium listed for, and is MSC among them?
What do the listed limits cover: endotoxin, osmolality, pH, and anything specific to vesicles?
If serum is involved, how is each lot tested for depletion?
What does "xeno-free" or "animal origin-free" mean for every component?
What lot data is available, and will the same formulation be supplied at larger volume later?
What are the storage class and shelf life, and how does the bottle ship?

Mistakes that cost a programme time

Collecting in the wrong medium. With ordinary serum medium, the vesicles in the serum end up in the sample.
Paying for depleted serum without testing a serum-free route. The price complaint is public, and a serum-free collection medium can be quoted alongside it for comparison.
Comparing on bottle price alone. Freight class and a 12 month shelf life change the real cost.
Treating equal listed limits as equal products. Two prices sit behind the same listed endotoxin, osmolality and pH.
Leaving the documentation question for later. Researchers moving toward a clinical path report not knowing what information to collect.
Planning only bench volumes. Exosome manufacturing was limited to small batches until recently; ask about larger volumes before you standardise on a bottle.

Tell us your cells and volume

Email [email protected] to request a wholesale quote or bulk pricing for the serum-free collection media. Tell us:

the cell source and passage plan;
the run volume per month;
the readout you use;
whether you buy for resale, private label or your own use.

We tell you which of these media fits and what lot data is available for each. Ask about a trial quantity of the serum-free EV medium.

Reference pages on this topic

Chemically Defined MediumA chemically defined medium is a cell culture medium in which the identity and concentration of every component is known — no serum, no protein hydrolysates, no undefined extracts. It may still contain proteins, provided they are recombinant and of known sequence and concentration, which is why chemically defined and protein-free are distinct categories rather than synonyms. Chemically defined media eliminate the lot-to-lot variability, adventitious agent risk and regulatory burden of serum, and are the standard for biopharmaceutical production in CHO, HEK293 and hybridoma systems.
Sf9 Cells and the Baculovirus Expression SystemSf9 is a clonal insect cell line isolated from Sf21, which was established from pupal ovarian tissue of the fall armyworm *Spodoptera frugiperda*. It is the standard host for the baculovirus expression vector system, used to produce recombinant proteins, virus-like particles and AAV. Sf9 cells grow at 27 C without CO2 in phosphate-buffered insect media at pH 6.2-6.4, adapt readily to serum-free suspension culture at 100-130 rpm, and double every 18-24 hours. Cultures are passaged when they reach roughly 2.5-3.5 x 10^6 cells/mL and diluted back to about 1 x 10^6 cells/mL, and infections are performed on healthy log-phase cells above 95% viability.
Bovine Serum in Cell CultureBovine serum is the liquid fraction of clotted cattle blood, added to culture medium at 5-10% to supply growth factors, hormones, transport and attachment proteins, lipids and trace elements that basal media do not contain. Fetal bovine serum (FBS) and fetal calf serum (FCS) are two names for the same product, collected from the fetus at slaughter of pregnant cows; newborn calf serum comes from calves under about 20 days old and donor bovine serum from controlled donor herds aged roughly 12-36 months, both containing more immunoglobulin and fewer growth factors than FBS. Because serum is an undefined biological material with substantial lot-to-lot variation, unresolved animal welfare questions and a volatile supply chain, defined serum-free and animal-origin-free media are increasingly preferred where the cell line will tolerate them.
Iodixanol as a Density Gradient MediumIodixanol is a non-ionic, water-soluble iodinated compound used as a density gradient medium, supplied as a sterile 60% (w/v) solution with a density of 1.32 g/mL. Its defining advantage is that it is iso-osmotic across the whole useful density range -- a 60% solution has an osmolality of approximately 290 mOsm/kg -- so cells, organelles, viruses and extracellular vesicles can be banded at high density without the osmotic dehydration caused by sucrose or the high ionic strength of caesium chloride. It is the standard medium for laboratory-scale AAV purification, where a four-step gradient of 15%, 25%, 40% and 60% separates genome-containing capsids at the 40-60% interface, and it is also widely used for cell separation, organelle fractionation and extracellular vesicle flotation.
Recombinant Human Albumin in Cell CultureRecombinant human serum albumin (rHSA) is a 585-amino-acid, 66.5 kDa non-glycosylated protein produced in yeast such as *Pichia pastoris* or in transgenic rice rather than purified from human plasma, and it is used as an animal-origin-free supplement in serum-free and chemically defined culture media. In culture it works as a carrier for fatty acids, lipids, hormones and trace elements, as an antioxidant through its free cysteine-34 thiol, as a scavenger that sequesters toxic metals and excess free fatty acids, and as a shear-protective surface-active protein in stirred and sparged culture. Typical working concentrations are 0.1-10 g/L, most often 0.5-5 g/L, and it is commonly supplied as a 200 mg/mL (20%) solution. Its performance depends heavily on what is bound to it, so fatty-acid-loaded and fatty-acid-free preparations behave quite differently.
DMEM (Dulbecco's Modified Eagle Medium)DMEM (Dulbecco's Modified Eagle Medium) is a basal cell culture medium derived from Eagle's Minimal Essential Medium by raising the amino acid and vitamin concentrations roughly fourfold. It is supplied in high-glucose (4,500 mg/L, 25 mM) and low-glucose (1,000 mg/L, 5.6 mM) forms, buffered with 3,700 mg/L sodium bicarbonate, and requires serum or a defined supplement plus a CO2 atmosphere to hold physiological pH. DMEM is the default medium for adherent lines such as HEK293, HeLa, NIH/3T3, Vero and CHO-derived adherent cultures, and for most primary fibroblasts.

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