Steroid isolation , depending on context, is the isolation of chemical matter required for chemical structure elucidation, derivitzation or degradation chemistry, biological testing, and other research needs (generally milligrams to grams, but often more  or the isolation of "analytical quantities" of the substance of interest (where the focus is on identifying and quantifying the substance (for example, in biological tissue or fluid). The amount isolated depends on the analytical method, but is generally less than one microgram.  [ page needed ] The methods of isolation to achieve the two scales of product are distinct, but include extraction , precipitation, adsorption , chromatography , and crystallization . In both cases, the isolated substance is purified to chemical homogeneity; combined separation and analytical methods, such as LC-MS , are chosen to be "orthogonal"—achieving their separations based on distinct modes of interaction between substance and isolating matrix—to detect a single species in the pure sample. Structure determination refers to the methods to determine the chemical structure of an isolated pure steroid, using an evolving array of chemical and physical methods which have included NMR and small-molecule crystallography .  :10–19 Methods of analysis overlap both of the above areas, emphasizing analytical methods to determining if a steroid is present in a mixture and determining its quantity. 
Pink eye treatment consists of over the counter treatment medication and prescription medication. For bacterial infection, there is a an antibiotic that can treat the bacteria. This bacteria is in the form of eye drops or ointments that should be applied to the eyes for some days. If allergy is the reason for pink, then over the counter pink eye treatment includes eye drops like Patanol, which can be effective with just 2 drops in a day. It is safe for kids over the age of 3 years. The other medications include antihistamines which are mostly prescribed and not over the counter. Another pink eye drops that is good is Similasan Allergy Relief, an OTC medicine for pink eye that is good but not so effective. OTC medicines for conjunctivitis help in soothing symptoms. Warm compresses can also help in remove crusty portion around the eye and sticky residue. But if the problem persists, it is better to check with an eye doctor.