Ultrasonic vs. Soxhlet Extraction for Medicinal Mushrooms: Why We Switched

Short answer: In the mushroom studies we reviewed, ultrasonic-assisted extraction (UAE) matched or outperformed Soxhlet extraction on most of the measures reported for triterpenes, polyphenols and beta-glucans, in minutes instead of hours and at lower, controlled temperatures. Soxhlet still wins in a few specific cases, and we cover those below. This is why Mindfull Mycology moved from Soxhlet extractors to a Hielscher UP400St ultrasonic processor.

What Is Soxhlet Extraction and How Does It Work?

Soxhlet extraction is a laboratory method that washes a solid sample with continuously recycled hot solvent. Franz von Soxhlet invented it in 1879, and for well over a century it was considered the gold standard for pulling compounds out of solids (LCGC).

The cycle works like this:

1. Solvent, often ethanol or hexane, is heated to its boiling point in a flask.
2. The vapor rises to a chilled condenser, turns back into liquid, and drips onto powdered mushroom held in a thimble.
3. When the chamber fills, a siphon empties it back into the flask, carrying dissolved compounds along.
4. The cycle repeats, and every pass delivers fresh solvent to the sample.

A run typically lasts 6 to 48 hours. Hielscher, the maker of the ultrasonic processor we use, suggests 6 to 8 hours for small, highly soluble compounds, 12 to 24 hours for polar compounds with lower solubility, and several days for complex compounds. The solvent sits at or near its boiling point the entire time, and a chilled-water condenser runs the whole time too.

What Is Soxhlet Extraction Good At, and What Is It Not?

Soxhlet earned its reputation honestly, and it still has real strengths.

What Soxhlet does well

• Thorough extraction of stable compounds. Fresh solvent on every cycle keeps contact between solvent and sample high, which is why Soxhlet is a reference method for near-complete recovery.
• Fat-soluble, heat-stable compounds. Lipids and sterols such as ergosterol suit a hot organic solvent, and ergosterol studies still use Soxhlet as the benchmark.
• Hands-off operation. Once it is set up, it runs without much monitoring.
• A well-understood comparison point. Most ultrasonic extraction studies measure themselves against it.

Where Soxhlet falls short for medicinal mushrooms

• Sustained heat. Extraction temperature is limited to the solvent's boiling point, which can be too harsh for heat-sensitive compounds. In a Reishi (Ganoderma lucidum) study, Soxhlet triterpene and phenolic levels rose over the first five or six cycles and then declined as the run continued, a pattern the authors linked in part to compound degradation (Oludemi et al., 2018).
• Time and solvent. Runs last hours to days, and solvent costs can push the cost per extraction to 1.5 to 2 times that of alternatives, including ultrasound-assisted extraction.
• Passive extraction. Nothing physically breaks open the tough chitin and beta-glucan cell walls of a mushroom. The solvent has to soak in on its own, and fine powders can clump in the thimble.
• Poor fit for volatile or thermally unstable compounds, which can degrade or leave with the solvent vapor.

What Is Ultrasonic-Assisted Extraction, and How Does It Work?

Ultrasonic-assisted extraction (UAE), also called ultrasonic extraction or sonication, uses high-frequency sound waves to move compounds out of plant or fungal material and into a solvent. Instead of waiting for the solvent to soak in, it adds mechanical energy directly to the mushroom-solvent mixture.

The mechanism is called acoustic cavitation:

1. Sound waves alternate between high and low pressure as they pass through the liquid.
2. During the low-pressure phase, microscopic vapor bubbles form.
3. During the high-pressure phase, those bubbles collapse violently.
4. Each collapse releases a tiny, localized shockwave that ruptures nearby cell walls and drives solvent through the damaged tissue.

That matters for fungi, whose cell walls are built from chitin and beta-glucans. Cavitation attacks that barrier mechanically instead of waiting for diffusion.

The equipment: Hielscher UP400St

We use a probe-type processor, meaning a titanium probe (a sonotrode) sits directly in the mushroom-solvent slurry. In our setup the probe works alongside an overhead stirrer that keeps powdered mushroom suspended, inside a sound-protection enclosure. The UP400St is built in Germany, and these are its published specifications:

The data logging is one reason we like it: every batch leaves a record of what the processor actually did. For reference, Hielscher's own lab protocol sonicates 100 g of dried mushroom in 500 mL of water for roughly 5 to 10 minutes. Our settings are tuned species by species, so treat that as a ballpark for the speed of the method, not our recipe.

What Is Ultrasonic Extraction Good At, and Where Are Its Limits?

What ultrasonic extraction does well

• Speed. The mushroom studies below report strong recoveries in 15 to 40 minutes: 15 minutes for ergosterol from button mushrooms, 21 minutes for chanterelle polyphenols, and 40 minutes for Reishi triterpenes.
• Lower, controllable temperatures. The chanterelle extraction ran at 40 °C. A 2025 shiitake study kept ultrasound-assisted water extraction below 60 °C using an external water bath and intermittent pulsing.
• Mechanical cell-wall disruption. Cavitation works in water and in ethanol, so it helps with both halves of a dual extract.
• Less solvent and time per batch, which an oyster mushroom study measured directly (see the studies section).
• Control and documentation. Amplitude, time and temperature are adjustable and, on the UP400St, logged.

Where ultrasonic extraction has limits

• The settings matter. Intense or prolonged sonication can shorten polysaccharide chains. In one high-power study, ultrasound at 35 W/cm² or higher cut the viscosity of a fungal polysaccharide solution by nearly 85% in 10 minutes and reduced its molecular weight (Wang et al., 2010). A Phellinus linteus study found the same direction: higher intensity, greater molecular weight reduction (Yan et al., 2016). Those studies sonicated already-dissolved polysaccharides on purpose. A tuned extraction is gentler: in the Reishi study below, ultrasound produced beta-glucans with higher molecular weight than Soxhlet or hot water.
• Heat builds near the probe. Cooling, pulsing and temperature monitoring are not optional. A critical review of UAE variables warns that high power over long periods can damage heat-sensitive compounds.
• Equipment-dependent results. Probe type, vessel geometry and dissolved gas all change cavitation, so reproducibility takes work. Standardized settings and per-batch logs are the answer.
• Scale-up needs energy-based planning. A laboratory scale-up study points out that run time alone is not a scale-up parameter. Matching acoustic energy per volume is.
• The probe is a wear part. Like any probe-based system, the titanium sonotrode wears with use, which is one more reason batches go to independent labs for purity testing.

Ultrasonic vs. Soxhlet Extraction: Head-to-Head Comparison

Ultrasonic extraction is faster, gentler and better at breaking open mushroom cell walls, while Soxhlet remains strong for exhaustive recovery of heat-stable, fat-soluble compounds. The table compares them side by side, using the sources cited in this article.

What Do the Studies Say? Ultrasonic vs. Soxhlet in Medicinal Mushrooms

Across seven mushroom studies that compared ultrasound-assisted extraction directly with Soxhlet, ultrasound came out ahead in five, tied in one, and lost in one. Here is each one.

How to read this scorecard. Ultrasound won on triterpenes, polyphenols, glucan quality, speed and solvent use. It only tied on ergosterol, a stable, fat-soluble sterol that suits Soxhlet well. Total mass recovery is also not the same as bioactive content, since a heavier extract can simply contain more of everything. The studies vary in species, solvents and equipment, so compare each result with its own Soxhlet control rather than across rows.

Related evidence beyond Soxhlet

• Shiitake beta-glucans. A 2025 study in Foods found ultrasound-assisted water extraction gave the highest beta-glucan content (34.51 g per 100 g of dry extract) among four methods. Hot water extraction best preserved structural properties such as swelling power, which is why extraction settings deserve care.
• Reishi co-extraction. A PLOS ONE study showed ultrasound can extract polysaccharides and triterpenoids together. The polysaccharides had higher antioxidant capacity than hot-water-extracted ones, and the triterpenoid-rich extract matched ethanol maceration.
• Cordyceps. An orthogonal-design study of ultrasonic cordycepin extraction from Cordyceps militaris is cited in a review as reaching a cordycepin extraction yield of about 87%.

Where Soxhlet Still Wins, and Why We Switched Anyway

Soxhlet is not a bad method. It is hard to beat for stable, fat-soluble compounds like ergosterol, and it is the right tool when a lab needs to know the maximum amount of a substance a sample can give up. The studies above also show it pulling out more total mass and more phenolic acids in specific cases.

But we are not running an analytical test. We are making a finished extract from medicinal mushroom fruit bodies, and four things tipped the decision toward ultrasonic extraction:

1. The compounds we care about are the ones ultrasound helps most. Triterpenes, polyphenols and beta-glucan quality are exactly where the Reishi, chanterelle and oyster mushroom studies favored ultrasound.
2. We can control heat instead of accepting it. In Soxhlet the solvent sets the temperature, and it stays there for hours. With the UP400St, temperature, amplitude and pulse timing are settings we choose and monitor.
3. It does more with less. Minutes instead of hours, less solvent per batch, and no hours of heater and chilled condenser water running per batch.
4. Every batch leaves a record. The processor logs amplitude, power, time and temperature, so we can see what actually happened in the vessel, not just what we intended.

There is a catch, and we want to be upfront about it: ultrasound is not plug-and-play. Pushed too hard, it can degrade the very polysaccharides you are trying to recover. That is why we spent more than two years dialing in frequency, amplitude and timing for each mushroom species rather than running every batch on one generic setting.

How Ultrasonic Extraction Fits a Dual-Extract Process

Ultrasonic extraction does not replace the dual-extract principle. Alcohol still targets triterpenes, and water still targets beta-glucans. Ultrasound makes each of those stages more efficient.

• Ethanol stage (triterpenes). The Reishi study above used ethanol-based ultrasound to recover ganoderic acids and other triterpenoids in 40 minutes.
• Water stage (beta-glucans). The 2025 shiitake study found ultrasound-assisted water extraction gave the highest beta-glucan content of the methods tested, with temperature held below 60 °C.
• Why we do not collapse it into one step. A Reishi co-extraction study shows ultrasound can pull polysaccharides and triterpenoids in a single pass, but at modest yields (0.63% and 0.38%) and 80 °C for 100 minutes. We would rather match each solvent to its compound class.

Our full workflow is covered in Our Ultrasonic Process. In short: fruit bodies are dehydrated at low temperature and pulverized, extracted with the UP400St under temperature monitoring, pressed, then concentrated by vacuum rotary evaporation at roughly 50 °C for water and 35 °C for ethanol. Batches go to independent labs, and you can see the results on our third-party lab reports page.

Curious how this applies to specific mushrooms? See our guides to Reishi, Cordyceps and Lion's Mane.

Frequently Asked Questions About Ultrasonic and Soxhlet Extraction

Is ultrasonic extraction better than Soxhlet extraction for medicinal mushrooms?

In most of the mushroom studies we reviewed, yes. Ultrasound matched or beat Soxhlet on Reishi triterpenes, Reishi beta-glucan quality, chanterelle polyphenols and oyster mushroom extracts, in far less time. Soxhlet still did better on total mass yield in one thesis and on phenolic acids in one Reishi study, so the answer depends on which compounds you want.

What is Soxhlet extraction used for?

Soxhlet extraction pulls soluble compounds out of solids using continuously recycled hot solvent. It is widely used for fats and oils, environmental samples, polymer additives and natural products, and it is often the reference method newer techniques are measured against.

Does ultrasonic extraction destroy beta-glucans?

Not when it is tuned properly. Intense or prolonged sonication can shorten polysaccharide chains, which is why settings matter. In a Reishi study, ultrasound-extracted beta-glucans had higher molecular weight than those from hot water or Soxhlet. A 2025 shiitake study found ultrasound-assisted water extraction gave the highest beta-glucan content with temperature capped below 60 °C.

Does ultrasonic extraction use heat?

The process warms the liquid, so temperature has to be managed. The UP400St has a built-in temperature sensor plus adjustable amplitude and pulse settings. The chanterelle and shiitake studies cited here ran at 40 °C and below 60 °C, respectively, well under the boiling point of the solvent.

How long does ultrasonic extraction take compared with Soxhlet?

A Soxhlet run typically takes 6 to 48 hours. The ultrasonic extractions in the mushroom studies cited here took 15 to 40 minutes. Hielscher's published lab protocol for the UP400St uses roughly 5 to 10 minutes for a 500 mL mushroom-water slurry.

Why does the extraction method matter in a mushroom supplement?

The same mushroom can give very different extracts depending on solvent, temperature, time and how well the cell walls are broken open. A full-spectrum extract needs both beta-glucans and triterpenes, which is why we pair a dual-extract approach with ultrasonic extraction. You can verify results on our third-party lab reports page.

Does Mindfull Mycology still use Soxhlet extractors?

No. We used Soxhlet extraction before and moved to ultrasonic-assisted extraction after more than two years of research and development.

Ready to try extracts made with ultrasonic-assisted extraction?

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Sources

Mushroom studies

• Oludemi T, et al. Extraction of triterpenoids and phenolic compounds from Ganoderma lucidum: optimization study using the response surface methodology. Food & Function, 2018.
• Alzorqi I, Sudheer S, Lu T-J, Manickam S. Ultrasonically extracted beta-D-glucan from artificially cultivated mushroom, characteristic properties and antioxidant activity. Ultrasonics Sonochemistry, 2017.
• Amirullah NA, et al. Application of ultrasound towards improving the composition of phenolic compounds and enhancing in vitro bioactivities of Pleurotus pulmonarius (Fr.) Quel extracts. Biocatalysis and Agricultural Biotechnology, 2021.
• Hu D, Huang S, Zhu X, Shi W. Ultrasound-assisted extraction of polyphenols from the mushroom of Cantharelles cibarius and its antioxidant activity. Science and Technology of Food Industry, 2022.
• Extraction of natural antioxidants from the Thelephora ganbajun mushroom by an ultrasound-assisted extraction technique and evaluation of antiproliferative activity of the extract against human cancer cells.
• Heleno SA, et al. Optimization of ultrasound-assisted extraction to obtain mycosterols from Agaricus bisporus L. by response surface methodology and comparison with conventional Soxhlet extraction. Food Chemistry, 2016;197:1054-1063.
• James JA-K. Medicinal mushrooms: the extraction and analysis of bioactive compounds from Hericium erinaceus and Ganoderma lucidum mushrooms. M.Sc. thesis, University of Windsor, 2024.
• Phosarith N, Siriwoharn T, Jirarattanarangsri W. Comparison of the conventional, chemical, and ultrasound extraction of crude polysaccharides and their properties from Lentinula edodes. Foods, 2025.
• Zheng S, Zhang W, Liu S. Optimization of ultrasonic-assisted extraction of polysaccharides and triterpenoids from the medicinal mushroom Ganoderma lucidum and evaluation of their in vitro antioxidant capacities. PLOS ONE, 2020.
• Wang H-J, et al. Optimization of ultrasonic-assisted extraction of cordycepin from Cordyceps militaris using orthogonal experimental design. Molecules, 2014;19(12):20808-20820, and the review New insights into cordycepin production in Cordyceps militaris and applications.
• Wang ZM, Cheung YC, Leung PH, Wu J. Ultrasonic treatment for improved solution properties of a high-molecular weight exopolysaccharide produced by a medicinal fungus. Bioresource Technology, 2010;101(14):5517-5522.
• Yan J-K, Wang Y-Y, Ma H-L, Wang Z-B. Ultrasonic effects on the degradation kinetics, preliminary characterization and antioxidant activities of polysaccharides from Phellinus linteus mycelia. Ultrasonics Sonochemistry, 2016.

Method background and equipment

• Looking at the past to understand the future: Soxhlet extraction. LCGC.
• What is Soxhlet extraction? Organomation.
• Hielscher Ultrasonics, the manufacturer of the UP400St, is cited only for equipment specifications and protocols: UP400St product page, UP400St fact sheet (PDF), Soxhlet extraction overview, and beta-glucan extraction protocol.
• Critical variables influencing the ultrasound-assisted extraction of bioactive compounds, a review.
• Limitations of sonochemistry. Techniques de l'Ingenieur, 2025.
• Laboratory scale-up of ultrasound-assisted extraction of phenolic compounds. University of Turku.

This article is for informational and educational purposes only and describes Mindfull Mycology's production process as of the date of publication. As with any dietary supplement, consult your physician before incorporating medicinal mushroom extracts into your regimen.