りん酸ジカリウム

外観

白色の結晶又は塊

定義

本品は、リン酸(*)の二カリウム塩であり、次の化学式で表される。
参照表示名称：リン酸

溶解性

水に易溶 (159g/100ml, 20℃), エタノールに難溶。水に極めて溶けやすく、エタノールにやや溶けやすい。

解説

リン酸水素二カリウム：K2HPO4(136.09)．略称DKP．第二リン酸カリウム(secondary potassium phosphate)ともいう．リン酸と水酸化カリウムを1：2のモル比に混合し，pH 9.0に調整し，加熱濃縮後，100 ℃ で加熱脱水すると無水和物が得られる．無色の板状または針状の斜方晶系結晶．きわめて強い潮解性を示す．溶解度159 g/100 g 水(20 ℃)，エタノールに微溶．水溶液は微アルカリ性を示す．加熱すると282 ℃ 以上で分解し，二リン酸カリウムK4P2O7を生じる．pH 緩衝剤，かん水，膨張剤，金属封鎖剤，醸造用添加剤，細菌の培養基，医薬品，排水処理剤などとして使用される．

用途

食品添加物用。

用途

中華めん、乳製品、添加剤、排水処理剤

用途

製薬、製剤原料。

用途

1) pH緩衝剤　2) 細菌、カビの培養基 3) 医薬品原料

用途

緩衝剤、pH調整剤、調製液原料。

化粧品の成分用途

pH調整剤、腐蝕防止剤

効能

補正用電解質液

使用上の注意

吸湿性あり

説明

Potassium Phosphate Dibasic is a common source of phosphorus and potassium, which is often used as a fertilizer. It is also widely applied in the food industry, such as food additive and electrolyte replenisher for workout supplement. Another usage of Potassium Phosphate Dibasic is as a medicine, who serves as a diuretic or laxative. Besides, it is employed in the production of imitation dairy creamers to prevent coagulation and used in certain powders to prepare beverages. In addition, it is commonly seen in chemical laboratories for producing buffer solutions and trypticase soy agar which is used to make agar plates for culturing bacteria.

化学的特性

White crystalline powder

物理的性質

White amorphous powder; deliquesces; decomposes on heating; converts to pyrophosphate when ignited; very soluble in water, 167 g/100mL at 20°C; very soluble in alcohol; aqueous solution slightly alkaline.

使用

Potassium Phosphate Dibasic is the dipotassium salt of phosphoric acid which functions as a stabilizing salt, buffer, and sequestrant. It is mildly alkaline with a ph of 9 and is soluble in water with a solubility of 170 g/100 ml of water at 25°c. It improves the colloidal solubility of proteins. It acts as a buffer against variation in ph. For example, it is used in coffee whiteners as a buffer against ph variation in hot coffee and to prevent feathering. It also functions as an emulsifier in specified cheeses and as a buffering agent for processed foods. It is also termed dipotassium monohydrogen orthophosphate and dipotassium monophosphate.

製造方法

Dipotassium phosphate is prepared by partial neutralization of phosphoric acid with potassium hydroxide, followed by crystallization:
H₃PO₄+ 2KOH →K2HPO₄+ 2H₂O.

定義

ChEBI: A potassium salt that is the dipotassium salt of phosphoric acid.

一般的な説明

Potassium phosphate dibasic is a useful biological buffer having a pH in the range of 8.5-9.6. Potassium phosphate is present in various forms: monobasic (KH₂PO₄), dibasic (KH₂PO₄), and tribasic (K₃PO₄). Potassium phosphate buffers are widely employed in equilibrium dialysis, high performance liquid chromatography (HPLC) and affinity capillary electrophoresis studies.

参考文献

https://en.wikipedia.org/wiki/Dipotassium_phosphate
https://pubchem.ncbi.nlm.nih.gov/compound/Dipotassium_hydrogen_phosphate#section=Other-Identifiers
https://www.isitbadforyou.com/questions/is-dipotassium-phosphate-bad-for-you