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Hydroquinone, also known as benzene-1,4-diol or quinol, is an aromatic organic compound that is a type of phenol, a derivative of benzene, having the chemical formula C 6 H 4 (OH) 2. It has two hydroxyl groups bonded to a benzene ring in a para position. It is a white granular solid. Substituted derivatives of this parent compound are also ...
Catechol (/ ˈ k æ t ɪ tʃ ɒ l / or / ˈ k æ t ɪ k ɒ l /), also known as pyrocatechol or 1,2-dihydroxybenzene, is an organic compound with the molecular formula C 6 H 4 (OH) 2. It is the ortho isomer of the three isomeric benzenediols .
There are three structural isomers: 1,2-dihydroxybenzene (the ortho isomer) is commonly known as catechol, 1,3-dihydroxybenzene (the meta isomer) is commonly known as resorcinol, and 1,4-dihydroxybenzene (the para isomer) is commonly known as hydroquinone.
In United States Pharmacopeia (USP) General Chapter <711> Dissolution, there are four dissolution apparatuses standardized and specified. [6] They are: USP Dissolution Apparatus 1 – Basket (37 °C ± 0.5 °C ) USP Dissolution Apparatus 2 – Paddle (37 °C ± 0.5 °C) USP Dissolution Apparatus 3 – Reciprocating Cylinder (37 °C ± 0.5 °C)
Mequinol is a common active ingredient in topical drugs used for skin depigmentation.As a topical drug mequinol is often mixed with tretinoin, a topical retinoid.A common formulation for this drug is an ethanolic solution of 2% mequinol and 0.01% tretinoin by mass. [1]
The unemployment rate fell to 4.1% from November's 4.2%. It was positive news for the economy ahead of twin reports in mid-January that showed slowing, yet sticky inflation.
Methylparaben is commonly used as a fungicide in Drosophila food media at 0.1%. [5] To Drosophila , methylparaben is toxic at higher concentrations, has an estrogenic effect (mimicking estrogen in rats and having anti- androgenic activity), and slows the growth rate in the larval and pupal stages at 0.2%.
Styrene, for example, is distilled at temperatures above 100 °C whereupon it undergoes thermal polymerisation at a rate of ~2% per hour. [1] This polymerisation is undesirable, as it can foul the fractionating tower ; it is also typically exothermic , which can lead to a runaway reaction and potential explosion if left unchecked.