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For optimal results in HPLC analysis, it is recommended to measure absorbance at a wavelength that matches the absorption maximum of the compound(s) being analyzed. The UV spectrum shown can assist in selecting an appropriate wavelength for your analysis. Please note that certain mobile phases and buffers may block wavelengths below 230 nm, rendering absorbance measurement at these wavelengths ineffective. If detection below 230 nm is required, it is recommended to use acetonitrile and water as low UV-transparent mobile phases, with phosphoric acid and its salts, sulfuric acid, and TFA as buffers.
For some compounds, the UV-Vis Spectrum is affected by the pH of the mobile phase. The spectra presented here are measured with an acidic mobile phase that has a pH of 3 or lower.

HPLC Method for Separation of Hydrophobic, Cationic and Anionic Surfactants on Newcrom BH by SIELC Technologies

Surfactants, also known as surface-active agents, are compounds that lower the surface tension (or interfacial tension) between two liquids or between a liquid and a solid. Surfactants may act as detergents, wetting agents, emulsifiers, foaming agents, or dispersants.

They are often classified according to the charge of the polar head group:

Anionic Surfactants: These surfactants have a negative charge on their polar head group. Common examples include soap, sodium laureth sulfate, and sodium lauryl sulfate. They are commonly used in detergents and shampoos due to their ability to emulsify oils and hold dirt in suspension, so it can be rinsed away.

Cationic Surfactants: These surfactants have a positive charge on their polar head group. Examples include cetyltrimethylammonium bromide (CTAB) and benzalkonium chloride. These are often used as antiseptics and can also be found in hair conditioners because they reduce static cling.

Nonionic Surfactants: These surfactants have no charge on their polar head group. Examples include alcohol ethoxylates, nonylphenol ethoxylates, and polysorbates. Nonionic surfactants are often used in laundry and dishwasher detergents.

Sodium, which has a chemical symbol of Na, is a soft alkali metal that is highly reactive.  It is found in abundance in everyday materials like table salt, sea water, and even the Earth’s crust. It is crucial  for the body’s function and fluid balance.

1-Ethylpyridinium bromide is an ionic liquid with the chemical formula C₇H₁₀BrN. It is primarily used as a solvent at temperatures below 100^oC catalysts, and electrolytes in , It has an ethyl group attached to a pyridinium ring, and its counterion is bromide (Br-). You can find detailed UV spectra of 1-Ethylpyridinium bromide and information about its various lambda maxima by visiting the following link.

Benzalkonium chloride, also known as Zephiran or Alkyldimethylbenzylammonium chloride, is a positively charged surfactant with the chemical formula C₆H₅CH₂N(CH₃)₂RCl. It is often used as a pharmaceutical preservative and as an antiseptic. You can find detailed UV spectra of Benzalkonium chloride and information about its various lambda maxima by visiting the following link.

Cetylpyridinium Chloride, also written as CPC, is a cationic quaternary ammonium compound with the chemical formula C₂₁H₃₈ClN. It is commonly used in mouthwashes, toothpastes, lozenges, throat sprays, breath sprays, and nasal sprays due to it’s antiseptic abilities. You can find detailed UV spectra of Cetylpyridinium Chloride and information about its various lambda maxima by visiting the following link.

Chloride is typically used to refer to a compound or molecule that contains a chlorine anion: Cl^–. It is an electrolyte that is essential for bodily functions including blood pH, fluid balance, cellular functions, and more. Imbalance of chloride can indicate underlying health problems.

1-Pentanesulfonic acid is an organosulfonic acid with the chemical formula C₅H₁₂O₃S. It is primarily used in it’s sodium salt form as an anionic pairing agent. You can find detailed UV spectra of 1-Pentanesulfonic acid and information about its various lambda maxima by visiting the following link.

Lauric acid, also known as dodecanoic acid, is a saturated fatty acid. Its chemical formula is CH₃(CH₂)₁₀COOH. It is white in color, and it is a solid at room temperature with a melting point of around 44 degrees Celsius (111 degrees Fahrenheit). It is relatively inexpensive and has a long shelf life, which makes it an attractive ingredient in various commercial products. Lauric acid is found naturally in various plant and animal fats and oils, but the largest amounts of lauric acid are found in coconut oil and palm kernel oil. In these oils, lauric acid can make up to 50% of the total fat content. It is commonly used in the manufacturing of soaps and cosmetics due to its ability to form a lather when mixed with water. It is also used in food for its role in digestion and metabolic processes. It’s a medium-chain fatty acid, which means it is more easily absorbed and utilized by the body compared to long-chain fatty acids. You can find detailed UV spectra of Dodecanoic acid (Lauric acid) and information about its various lambda maxima by visiting the following link.

p-Toluenesulfonic Acid, also known as tosylic acid, which are written as PTSA, pTSA, pTsOH, and TsOH, is an organic compound with the chemical formula C₇H₈O₃S. It is used primarily in organic synthesis. You can find detailed UV spectra of p-Toluenesulfonic Acid and information about its various lambda maxima by visiting the following link.

1-Octanesulfonic acid is an anionic organosulfonic acid with the chemical formula C₈H₁₈O₃S. It is primarily used in it’s sodium salt form as an ion-pairing agent. You can find detailed UV spectra of 1-Heptanesulfonic acid and information about its various lambda maxima by visiting the following link.

Sodium dodecyl sulfate (SDS), or sodium lauryl sulfate (SLS), is a surfactant used in cleaning, hygienic, and food products. It has a chemical formula C₁₂H₂₅NaSO₄, meaning it has twelve carbon hydrophobic tail attached to a polar sulfate. At low concentrations, it is used as a whipping aid and emulsifier in foods containing egg whites. It has a similar use in pharmaceutics as an ionic solubilizer and, also, an emulsifier. In laboratory uses, it is used as a component for lysing cells during RNA extraction or DNA extraction. You can find detailed UV spectra of Sodium dodecyl sulfate and information about its various lambda maxima by visiting the following link.

Benzalkonium chloride, Cetylpyridinium Chloride, 1-Pentanesulfonic acid, Dodecanoic acid (Lauric acid), p-Toluenesulfonic Acid (PTSA), 1-Octanesulfonic acid, Sodium dodecyl sulfate, 1-Ethylpyridinium bromide can be retained, separated, and analyzed using a reverse-phase [colimn] column. The mobile phase for this method consists of water, acetonitrile (MeCN), and Ammonium formate, which serves as a buffer. This analytical method can be detected with an Evaporative Light Scattering Detector (ELSD) or any other evaporative detection method (CAD, ESI-MS).

Condition

Description

Organic acids were separated on a HILIC/cation-exchange column in HILIC/anion-exclusion mode. This column can be used for analysis of polar compounds in HILIC mode. If compounds are ionizable, additional mode of interaction can be added (cation-exchange or anion-exclusion).

Separation type: Liquid Chromatography Mixed-mode

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The majority of drugs in the pharmaceutical industry are administered in salt form. The presence of two counter-ions very often necessitates the use of two methods. The nature of these counterparts in drugs can be an inorganic cation and organic acid, inorganic anion and organic base, and organic cation and organic anion. Furthermore, the properties of the molecules will result in a differing stoichiometry. The task of simultaneous quantitation of counter-ions can be achieved by using mixed-mode columns. The general approach for analysis is based on properties of corresponding counter-ions. Hydrophobic basic drugs, like dextromethorphan, verapamil, trimipramine, and corresponding acidic counter-ions (chloride, chlorate, bromide, bromate, perchlorate, maleate, fumarate,tartrate, succinate, phosphate, citrate, benzosulfonate, toleuensulfonate) can be separated and quantitated in the same run on reversed-phase anion-exchange column. Basic hydrophobic drugs are retained by the reversed-phase mechanism, and counter-ions are retained by the reversed-phase and anion-exchange mechanism. Some polar counter-ions are retained only by the anion-exchange mechanism. Retention time and selectivity of HPLC separation of drugs and counter-ions can be achieved by changing the amount of acetonitrile and the amount of ions in the mobile phase. The detection technique depends on the properties of the counter-ions. In case of low or no UV activity, ELSD can be employed if the counter-ion forms a non-volatile salt with the mobile phase additive (ammonium formate). This HPLC method can be used for simultaneous quantitation of other basic drugs and counter-ions. The presence of two mechanisms of retention allows control over retention times of drug and counter-ion independently, and even allows a change of order of elution when necessary.

Ionic liquid is an ionic compound which is liquid at room (or close to room) temperature. Most of the ionic liquids are in a dynamic equilibrium where at any time more than 99.99% of the liquid is made up of ionic, rather than molecular, species. Room-temperature ionic liquids consist of bulky cation (for example, substituted imidazolium) compounds. A wide range of anions is used as counter ions in ionic liquids: organic and inorganic anions such as chloride, iodide, tetrafluoroborate, hexafluorophosphate, bistriflimide, triflate, tosylate. Ionic liquids are widely used as solvents in organic reactions. When products are isolated from ionic liquids, they need to be analyzed for residual ionic liquid content.
Because both constituents of the ionic liquid are very different in terms of charge and hydrophobic properties, it is impossible to analyze entire ionic liquids by traditional chromatography. An effective and universal method for analysis of ionic liquids is developed on an Obelisc R HPLC column. Components on the ionic liquids are retained based on ionic and hydrophobic interactions. Obelisc R column has both positively and negatively charged ionic groups, making it possible to retain and separate cations and anions of ionic liquids on one column. Method can be used for quantitative of various ionic liquids containing organic and inorganic ions. Retention time of basic component can be effectively adjusted by pH, stronger anionic and hydrophobic counter-ions might require higher buffer concentration. Composition can be monitored by combination of UV and ELSD or by LC/MS.