Sublimation comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Updated 2025-10-27. Numbers and descriptions here follow the published literature rather than marketing material.
Lyophilization is a dehydration process that removes water from a frozen material by sublimation under low pressure. The material is first frozen to convert liquid water into ice. Next, the pressure is reduced below the triple point of water so that ice changes directly into vapor without passing through a liquid phase. This step is called primary drying. The result is a porous solid or cake that retains the original shape of the frozen solution.
After primary drying, secondary drying removes water that remains bound to the material. This stage raises the shelf temperature while maintaining low pressure, which encourages desorption of unfrozen water. Residual moisture can be reduced to a low percentage, improving stability for many products. The process parameters, including freezing rate, shelf temperature, and chamber pressure, influence the final pore structure and reconstitution behavior. Control of these variables helps prevent collapse or meltback during drying.
A formulation often contains excipients that protect the active ingredient during freezing and drying. Bulking agents provide structure, while lyoprotectants stabilize sensitive molecules. The freezing step can produce ice crystals whose size and distribution affect the drying rate, and cycle design includes freezing, annealing, and drying phases. If the product temperature rises above a critical value, the cake may collapse or lose its porous structure. Successful lyophilization therefore depends on the interaction between formulation, equipment, and cycle design.
The process usually has three stages: freezing, primary drying, and secondary drying. Freezing sets the ice crystal structure and can determine pore size in the final cake. Primary drying removes free ice by sublimation at low pressure and low shelf temperature. Secondary drying removes bound water by raising the shelf temperature, although some water may remain as part of the solid. Cycle parameters depend on formulation, fill volume, vial type, and equipment performance.
The physical chemistry of freezing influences whether a formulation forms an amorphous glass or a crystalline solid. Amorphous systems can collapse if product temperature rises above the glass transition temperature of the freeze concentrate. Crystalline systems may show eutectic melting, where ice and solute melt together at a fixed temperature. Formulators add bulking agents, lyoprotectants, and buffers to preserve structure and biological activity. The optimum cycle keeps product temperature below critical thresholds during primary drying while allowing efficient sublimation.
Lyophilization is a dehydration process that removes water from a frozen material by sublimation under low pressure. The material is first frozen so that water becomes ice; then the surrounding pressure is lowered below the vapor pressure of ice. Heat is applied gently so ice changes directly to vapor without passing through a bulk liquid phase. The vapor is collected on a cold condenser, leaving a dry porous matrix. This process differs from simple evaporation because the material remains frozen during the main drying stage.
| Property | Value | Notes |
|---|---|---|
| Common synonyms | Freeze-drying, lyophilisation | Lyophilization is the American spelling; lyophilisation is British |
| Primary drying mechanism | Sublimation of ice | Occurs under vacuum below the triple point |
| Typical chamber pressure | 0.05-0.5 mbar | Range depends on product and equipment |
| Typical shelf temperature during freezing | -40 to -20 °C | Lower temperatures may be used for labile products |
| Resulting product form | Porous cake or powder | Appearance depends on formulation and cycle |
The physics of freeze-drying couples heat transfer, mass transfer, and phase change. Heat supplied through the shelf must reach the sublimation front without melting the ice or degrading the product. Water vapor then travels through the already dried layer and leaves the chamber, where low pressure and cold traps keep it from returning. The dried layer acts as a resistance to vapor flow, so drying rate changes as the front recedes. Open questions remain about how pore structure and formulation heterogeneity affect drying uniformity at larger scales.
Lyophilization removes water from a frozen material by sublimation under reduced pressure. The process begins with freezing, which converts liquid water into ice and concentrates dissolved solids. Primary drying then lowers chamber pressure so ice changes directly into vapor without passing through a liquid phase. Secondary drying raises the shelf temperature to remove bound water that remains after ice sublimation. The result is a dry, porous structure that can be reconstituted later.
Formulation composition influences whether freeze-drying produces an intact cake or a collapsed mass. Excipients such as sugars and polymers can raise the collapse temperature and provide bulk during drying. The critical temperature for primary drying is often the collapse temperature or the glass transition temperature of the maximally concentrated phase. If the product temperature exceeds this threshold, the frozen matrix may soften and lose structure. Established practice therefore links shelf temperature and chamber pressure to the formulation's thermal properties.
Freezing determines ice crystal structure and pore size, which affect drying speed and product uniformity. Rapid freezing creates small crystals, while slow freezing creates larger crystals and often faster sublimation. During primary drying, chamber pressure is held below the vapor pressure of ice, and shelf temperature supplies heat for sublimation. The ice front recedes, leaving a porous matrix. Thermal limits such as collapse and eutectic temperatures set safe boundaries for formulation. These limits vary with solute composition and concentration.
Secondary drying removes bound water that remains after ice sublimation. Shelf temperature is raised gradually while pressure remains low, reducing water content to a target range. Over-drying can cause brittleness or electrostatic issues, while under-drying affects stability. The endpoint is often judged by pressure rise tests, temperature measurements, or water content analysis. Scale-up depends on matching heat and mass transfer across equipment sizes. Small changes in shelf temperature or pressure can alter cycle length substantially.
"Current map of sea surface temperature anomalies in the Pacific Ocean". earth.nullschool.net. "Southern Oscillation diagnostic discussion". Climate Prediction Center. National Oceanic and Atmospheric Administration. "ENSO Outlook – An alert system for the El Niño–Southern Oscillation". Australian Bureau of Meteorology. Provides current phase of ENSO according to the Australian interpretation. "Cold & Warm Episodes by Season / Relative Oceanic Niño Index (RONI): Historical El Niño / La Niña episodes (1950–Present)". National Oceanic and Atmospheric Administration (NOAA).
=== The 53Mn – 53Cr chronometer === The short-lived 53Mn-53Cr chronometer is based on the radioactive decay of 53Mn to 53Cr with a half-life of 3.80 ± 0.23 million years. Because manganese and chromium are moderately volatile elements, their fractionation in the cooling solar nebula makes this chronometer particularly suited for dating volatile element depletion events in early Solar System materials. The initial homogeneous distribution of 53Mn in the Solar System, a prerequisite for its use as a chronometer, was established in early studies of Solar System materials. Applied to meteorites, 53Mn-53Cr systematics have provided key insights into the origin of chondrite parent bodies and the volatile element depletion history of the early Earth. The volatile element depletion of proto-Earth was established no later than ~3 million years after the formation of calcium-aluminium-rich inclusions (CAIs), contemporaneous with the dissipation of the protoplanetary disk, while full planetary accretion was completed within ~70 million years.
=== In diagnosis === Lactoferrin levels in tear fluid have been shown to decrease in dry eye diseases such as Sjögren's syndrome. A rapid, portable test utilizing microfluidic technology has been developed to enable measurement of lactoferrin levels in human tear fluid at the point-of-care with the aim of improving diagnosis of Sjögren's syndrome and other forms of dry eye disease.
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In 2020 Pogrund and Patrick Maguire published Left Out: The Inside Story of Labour Under Corbyn, which in part, addresses charges of, and assumptions about 'the new anti-Semitism' in the Labour Party. Eve Pollard Evelyn, Lady Lloyd, (née Pollard, formerly Winkleman, born 25 December 1943); has been the editor of several tabloid newspapers; was fashion editor at Honey magazine; also worked for Daily Mirror; was launch editor-in-chief of Elle magazine in the US and edited Sunday magazine for the News of the World and You magazine for the Mail on Sunday; also worked in television as features editor of TV-am (1982–1983) and devised Frocks on the Box for ITV contractor TVS.; often appeared on radio and TV; was regular participant in Through the Keyhole; was a guest panellist on the talk show Loose Women; in 2016, was appointed the first Chair of Reporters without Borders in the UK. In June 2019, was awarded the prestigious Journalist Laureate prize by the London Press Club. 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Sources: en.wikipedia.org
=== Forms === As of 2010, methylnaltrexone is supplied as an injection in trays containing seven one-dose vials containing 0.6 mL of solution. Each tray also contains seven 12 mm (0.47 in) 1 mL 27 gauge needles with retractable tips, and alcohol wipes for home use. A single vial can treat someone who weighs as much as 115 kilograms (254 lb). For hospital use, vials are available separately. It is also now available in 150 mg oral tablets, taken 3 to 5 times daily.
have disease progression during or following platinum-containing chemotherapy. have disease progression within 12 months of neoadjuvant or adjuvant treatment with platinum-containing chemotherapy. On 16 February 2018, the Food and Drug Administration approved durvalumab for patients with unresectable stage III non-small cell lung cancer (NSCLC) whose disease has not progressed following concurrent platinum-based chemotherapy and radiation therapy.
== In culture == Dried fruit are used on festive occasions by many cultures. In the Middle East it is customary to serve trays with mixed kinds of dried fruit for the Iftar meal that breaks the fast days during Ramadan. They are sometimes soaked in water beforehand. On the Jewish holiday of Tu BiShvat, it is customary to eat dried fruit. This tradition originates from the practice of eating fruits from the Land of Israel/Palestine, particularly the Seven Species, such as grapes, dates, and figs. Before the 20th century, most Jews lived in Europe, where, without modern technology, obtaining these fruits fresh was impossible, so they were typically consumed in their dried form.
== Controversies == Following a shortage that led a court to delay an execution in California, a company spokesman for Hospira, the sole American manufacturer of the drug, objected to the use of thiopental in lethal injection. "Hospira manufactures this product because it improves or saves lives, and the company markets it solely for use as indicated on the product labeling. The drug is not indicated for capital punishment and Hospira does not support its use in this procedure." On January 21, 2011, the company announced that it would stop production of sodium thiopental from its plant in Italy, because it could not provide Italian authorities with guarantees that exported doses would not be used in executions. According to a company spokesperson, Italy was the only viable place where it could produce the drug, leaving the US without a supplier. In October 2015 the US Food and Drug Administration (FDA) confiscated an overseas shipment of thiopental destined for the states of Arizona and Texas. The FDA said in a statement, "Courts have concluded that sodium thiopental for the injection in humans is an unapproved drug and may not be imported into the country".
Gs alpha stimulates adenylyl cyclase, thus converting adenosine triphosphate into cyclic adenosine monophosphate (AMP). Cyclic AMP activates protein kinase A. Protein kinase A phosphorylates and partially activates phosphorylase kinase. Adrenaline also binds to α1 adrenergic receptors, causing an increase in inositol trisphosphate, inducing calcium ions to enter the cytoplasm. Calcium ions bind to calmodulin, which leads to further activation of phosphorylase kinase. Phosphorylase kinase phosphorylates glycogen phosphorylase, which then breaks down glycogen leading to the production of glucose. Adrenaline also has significant effects on the cardiovascular system. It increases peripheral resistance via α1 receptor-dependent vasoconstriction and increases cardiac output by binding to β1 receptors. The goal of reducing peripheral circulation is to increase coronary and cerebral perfusion pressures and therefore increase oxygen exchange at the cellular level. While adrenaline does increase aortic, cerebral, and carotid circulation pressure, it lowers carotid blood flow and end-tidal CO2 or ETCO2 levels. It appears that adrenaline improves microcirculation at the expense of the capillary beds where perfusion takes place.
Sources: en.wikipedia.org
Lyophilization removes water by sublimation from a frozen material, while evaporation changes liquid water into vapor. The low-pressure freezing step avoids the liquid phase and can preserve heat-sensitive structures.
Vacuum lowers the pressure below the triple point of water, allowing ice to sublimate directly into vapor. It also helps remove water vapor from the product chamber and shortens primary drying.
Many aqueous solutions and suspensions can be freeze-dried, but some formulations collapse or do not form a stable cake. The process requires careful formulation and cycle development.
The main change is sublimation, in which ice becomes water vapor without melting into liquid water. This occurs when the chamber pressure is held below the vapor pressure of ice while mild heat is supplied. The result is a dry, porous solid that retains much of its original shape.