Kawamura K, Nakamachi H, Araki H, Sonoda K
J Assoc Off Anal Chem. 1987 Jul-Aug;70(4):673-8.
The physicochemical properties of potassium guaiacol-4-sulfonate (I) and -5-sulfonate (II) have been investigated. Analyses of the X-ray diffraction patterns, infrared spectra, and thermogravimetric and differential scanning calorimetric curves showed that I occurs as crystals that are anhydrous or hydrated up to 2/3 mole (4.8%) and that II occurs as crystals that are anhydrous or dihydrated (13.5%). Solutions of I and II at various pH values showed almost the same UV spectra at less than pH 6.0 but very different UV spectra greater than pH 7.0. Most commercially available potassium guaiacolsulfonate consists predominantly of potassium guaiacol-4-sulfonate (as determined by UV-absorption measurements and liquid chromatography).
已对愈创木酚-4-磺酸钾（I）和愈创木酚-5-磺酸钾（II）的物理化学性质进行了研究。对X射线衍射图谱、红外光谱以及热重和差示扫描量热曲线的分析表明，I以无水晶体或水合程度高达2/3摩尔（4.8%）的晶体形式存在，而II以无水或二水合（13.5%）的晶体形式存在。I和II在不同pH值下的溶液在pH小于6.0时显示出几乎相同的紫外光谱，但在pH大于7.0时则显示出非常不同的紫外光谱。大多数市售的愈创木酚磺酸钾主要由愈创木酚-4-磺酸钾组成（通过紫外吸收测量和液相色谱法测定）。
