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04248_RIEDEL
Also known as: 7758-11-4, Dipotassium phosphate, Potassium phosphate dibasic, Dipotassium hydrogenphosphate, Dibasic potassium phosphate, Potassium hydrogen phosphate
Molecular Formula
HK2O4P
Molecular Weight
174.176  g/mol
InChI Key
ZPWVASYFFYYZEW-UHFFFAOYSA-L
FDA UNII
CI71S98N1Z

Potassium Phosphate, Dibasic is the dipotassium form of phosphoric acid, that can be used as an electrolyte replenisher and with radio-protective activity. Upon oral administration, potassium phosphate is able to block the uptake of the radioactive isotope phosphorus P 32 (P-32).
1 2D Structure

04248_RIEDEL

2 Identification
2.1 Computed Descriptors
2.1.1 IUPAC Name
dipotassium;hydrogen phosphate
2.1.2 InChI
InChI=1S/2K.H3O4P/c;;1-5(2,3)4/h;;(H3,1,2,3,4)/q2*+1;/p-2
2.1.3 InChI Key
ZPWVASYFFYYZEW-UHFFFAOYSA-L
2.1.4 Canonical SMILES
OP(=O)([O-])[O-].[K+].[K+]
2.2 Other Identifiers
2.2.1 UNII
CI71S98N1Z
2.3 Synonyms
2.3.1 MeSH Synonyms

1. K2hpo4

2. Kd2po4

3. Potassium Acid Phosphate

4. Potassium Dideuterium Phosphate

5. Potassium Dihydrogen Phosphate

6. Potassium Monohydrogen Phosphate

7. Potassium Phosphate

8. Potassium Phosphate (k-h2po4)

9. Potassium Phosphate (k-h3po4(1:2))

10. Potassium Phosphate (k2-hpo4)

11. Potassium Phosphate (k3-po4)

12. Potassium Phosphate, Dibasic

13. Potassium Phosphate, Monobasic

14. Potassium Phosphate, Unspecified Form

2.3.2 Depositor-Supplied Synonyms

1. 7758-11-4

2. Dipotassium Phosphate

3. Potassium Phosphate Dibasic

4. Dipotassium Hydrogenphosphate

5. Dibasic Potassium Phosphate

6. Potassium Hydrogen Phosphate

7. Potassium Phosphate, Dibasic

8. Phosphoric Acid, Dipotassium Salt

9. Potassium Dibasic Phosphate

10. Dipotassium Monophosphate

11. Potassium Monohydrogen Phosphate

12. K2hpo4

13. Potassium Monophosphate

14. Dipotassium Hydrogenorthophosphate

15. Dipotassium Monohydrogen Phosphate

16. Dipotassium Orthophosphate

17. Mfcd00011383

18. Hydrogen Dipotassium Phosphate

19. Potassium Phosphate (dibasic)

20. Di-potassium Hydrogen Phosphate

21. Dipotassium Hydrogen Orthophosphate

22. Sec.-potassium Phosphate

23. Dipotassium Acid Phosphate

24. Potassium Hydrogenphosphate

25. Phosphoric Acid, Potassium Salt (1:2)

26. Secondary Potassium Phosphate

27. Ci71s98n1z

28. Ins No.340(ii)

29. Ins-340(ii)

30. Dipotassium Hydrogen Monophosphate

31. E-340(ii)

32. Potassium Phosphate Dibasic, Acs Reagent

33. Isolyte

34. Dipotassium-o-phosphate

35. Dipotassium;hydrogen Phosphate

36. Ccris 6544

37. Hsdb 935

38. Kali Phosphoricum

39. Leex-a-phos

40. Einecs 231-834-5

41. Mediject P (tn)

42. Di Potassium Phosphate

43. Potassiumhydrogenphosphate

44. Potassium Phosphate,dibasic

45. Dipotasium Hydrogen Phosphate

46. Unii-ci71s98n1z

47. Potassium Monohydrogenphosphate

48. Potassium Hydrogen Monophosphate

49. Chembl1200459

50. Dtxsid8035506

51. Kali Phosphoricum [hpus]

52. Chebi:32031

53. Chebi:131527

54. Dipotassium Phosphate [inci]

55. Dipotassium Monohydrogen Orthophosphate

56. Potassium Dibasic Phosphate Trihydrate

57. Potassium Phosphate (k2hpo4)

58. Akos015915872

59. Akos016371887

60. Db09414

61. Potassium Hydrogen Phosphate, Anhydrous

62. Potassium Phosphate [green Book]

63. Potassium Phosphate, Dibasic, Anhydrous

64. Potassium Phosphate, Dibasic (jan/usp)

65. Potassium Phosphate, Dibasic [usp:jan]

66. Potassium Phosphate Dibasic, Lr, >=98%

67. Potassium Phosphate, Dibasic [ii]

68. Potassium Phosphate, Dibasic [mi]

69. Sy010082

70. Di-potassium Hydrogen Orthophosphate

71. Dipotassium Phosphate [ep Impurity]

72. Potassium Phosphate, Dibasic [fcc]

73. Potassium Phosphate, Dibasic [jan]

74. Potassium Phosphate,dibasic [vandf]

75. Dipotassium Phosphate [ep Monograph]

76. Potassium Phosphate Dibasic Anhydrate

77. Potassium Phosphate, Dibasic [hsdb]

78. Dibasic Potassium Phosphate [usp-rs]

79. Potassium Phosphate Dibasic [who-dd]

80. Potassium Phosphate Dibasic Solution, 1.0 M

81. Potassium Phosphate Dibasic, Biochemical Grade

82. Potassium Phosphate Dibasic, Puriss., >=99%

83. D02403

84. Dipotassium Hydrogen Phosphate (k2hpo4)

85. Ec 231-834-5

86. Dibasic Potassium Phosphate [usp Impurity]

87. Dibasic Potassium Phosphate [usp Monograph]

88. Potassium Phosphate Dibasic, Acs Reagent, >=98%

89. Potassium Phosphate Dibasic, Usp, 98.0-100.5%

90. Potassium Phosphate, Dibasic [orange Book]

91. Q403721

92. Potassium Phosphate Dibasic, Ar, Anhydrous, >=99%

93. Potassium Phosphate, Dibasic [usp Impurity]

94. Potassium Phosphate Dibasic, Reagent Grade, >=98.0%

95. Potassium Phosphate Dibasic, 99.95% Trace Metals Basis

96. Potassium Phosphate Dibasic, Saj First Grade, >=98.0%

97. Potassium Phosphate Dibasic, Trace Metals Grade 99.95%

98. Potassium Phosphate Dibasic, Jis Special Grade, >=99.0%

99. Potassium Phosphate Dibasic, Vetec(tm) Reagent Grade, 98%

100. Potassium Phosphate Dibasic, Meets Usp Testing Specifications

101. Dibasic Potassium Phosphate Component Of Potassium Phosphates

102. Potassium Phosphates Component Dibasic Potassium Phosphate

103. Dibasic Potassium Phosphate, United States Pharmacopeia (usp) Reference Standard

104. Potassium Phosphate Dibasic, Anhydrous, Free-flowing, Redi-dri(tm), Acs Reagent, >=98%

105. Potassium Phosphate Dibasic, Puriss. P.a., Acs Reagent, Anhydrous, >=99.0% (t)

106. Potassium Phosphate Dibasic Anhydrous, Pharmagrade, Usp, Manufactured Under Appropriate Gmp Controls For Pharma Or Biopharmaceutical Production.

107. Potassium Phosphate Dibasic, Anhydrous, For Luminescence, For Molecular Biology, Bioultra, >=99.0% (t)

2.4 Create Date
2005-06-24
3 Chemical and Physical Properties
Molecular Weight 174.176 g/mol
Molecular Formula HK2O4P
Hydrogen Bond Donor Count1
Hydrogen Bond Acceptor Count4
Rotatable Bond Count0
Exact Mass173.88865848 g/mol
Monoisotopic Mass173.88865848 g/mol
Topological Polar Surface Area83.4 Ų
Heavy Atom Count7
Formal Charge0
Complexity46.5
Isotope Atom Count0
Defined Atom Stereocenter Count0
Undefined Atom Stereocenter Count0
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
Covalently Bonded Unit Count3
4 Drug and Medication Information
4.1 Therapeutic Uses

CATHARTIC

Budavari, S. (ed.). The Merck Index - Encyclopedia of Chemicals, Drugs and Biologicals. Rahway, NJ: Merck and Co., Inc., 1989., p. 1216


Factors affecting calcium-phosphate solubility in parenteral nutrition solutions used in neonates were studied. Six neonatal parenteral nutrition solutions were prepared using either Aminosyn or FreAmine II and various amino acid and dextrose concentrations. Phosphorus (as mono- and dibasic potassium phosphate) and calcium (as 10% calcium gluconate) were added in concentrations of calcium 2.5-100 meq/l and phosphorus 2.5-100 mmol/l. Duplicate samples were prepared and analyzed either after they were heated in a water bath (37 C) for 20 min or after 18 hr at 25 C followed by 30 min in a water bath (37 C). Precipitation was detected visually and spectrophotometrically, and pH was measured. Lipid emulsion was added to 2 FreAmine II solutions in a ratio of 7.5:1 (parenteral nutrition solution:lipid) and the resulting pH was measured. Time and temperature affected calcium-phosphate solubility in all solutions tested. Precipitation curves of amount of calcium versus amount of phosphate added were prepared for each solution. Amino acid and dextrose concentrations affected the pH of the solutions, and when a lipid emulsion was added, the pH rose more in the 1% than in the 2% FreAmine II solution. In selected solutions, as much as 120 mg/kg/day calcium and 55 mg/kg/day phosphate can be administered, approximating daily third trimester accumulation of these minerals. Use of the precipitation curves in this paper, with attention to their limitations, should aid in the safe delivery of calcium and phosphorus IV to neonates.

PMID:6798868 Eggert LD et al; Am J Hosp Pharm 39 (Jan): 49-53 (1982)


SALINE BULK CATHARTIC

Osol, A. and J.E. Hoover, et al. (eds.). Remington's Pharmaceutical Sciences. 15th ed. Easton, Pennsylvania: Mack Publishing Co., 1975., p. 744


4.2 Drug Warning

Oral administration is safer, but careful monitoring of serum electrolyte levels and renal function is necessary. Nausea, vomiting, and diarrhea may occur and may be dose dependent. Concomitant use of antacids containing aluminum and/or magnesium should be avoided, because they may bind phosphate and prevent it absorption (calcium antacids also may bind phosphate, and it is assumed that these agents are not given to hypercalcemic patients).

American Medical Association, Department of Drugs. Drug Evaluations. 6th ed. Chicago, Ill: American Medical Association, 1986., p. 897


Phosphate should not be given to patients with impaired renal function or hyperphosphatemia. They should not be given to patients with alkaline urine due to urinary tract infections because increased calcium and phosphate concentrations in the alkaline urine increase the risk of calcium phosphate stones.

American Medical Association, Department of Drugs. Drug Evaluations. 6th ed. Chicago, Ill: American Medical Association, 1986., p. 897


Intravenous administration of phosphates is dangerous. Hypocalcemia, hypotension and shock, myocardial infarction, tetany, and acute renal failure have occurred, and deaths have been reported. Deposition of calcium phosphate in the kidney, heart, lung, and blood vessels also may be fatal. For these reasons, intravenous therapy is not justified in the treatment of hypercalcemia. Phosphates should not be administered to patients with impaired renal function or hyperphosphatemia. They also should not be given to patients with alkaline urine due to urinary tract infections because increased calcium and phosphate concentrations in the alkaline urine increase the risk of calcium phosphate stones. Phosphate should be given as the potassium rather than the sodium salt because the latter causes volume expansion and inhibits phosphate reabsorption, thus negating the therapeutic effect. /Phosphate salt/

American Medical Association. AMA Drug Evaluations Annual 1991. Chicago, IL: American Medical Association, 1991., p. 1951


The most common adverse effect of phosphate salts is diarrhea. Patients with kidney stones may pass old stones when phosphate therapy is started and should be warned of this possibility. Phosphates are contraindicated in patients with infected stones and in those with renal function less than 30% of normal. /Orthophosphates/

American Medical Association, Department of Drugs. Drug Evaluations. 6th ed. Chicago, Ill: American Medical Association, 1986., p. 584


4.3 Drug Indication

Dipotassium phosphate is used in imitation dairy creamers, dry powder beverages, mineral supplements, and starter cultures as an additive. It is used in non-dairy creamers to prevent coagulation. Dipotassium phosphate is also used to make buffer solutions and it is used in the production of trypticase soy agar which is used to make agar plates for culturing bacteria.


5 Pharmacology and Biochemistry
5.1 Pharmacology

Phosphate is a major intracellular anion which participates in providing energy for metabolism of substances and contributes to important metabolic and enzymatic reactions in almost all organs and tissues. Phosphate exerts a modifying influence on calcium concentrations, a buffering effect on acid-base equilibrium, and has a major role in the renal excretion of hydrogen ions.


5.2 MeSH Pharmacological Classification

Cariostatic Agents

Substances that inhibit or arrest DENTAL CARIES formation. (Boucher's Clinical Dental Terminology, 4th ed) (See all compounds classified as Cariostatic Agents.)


Buffers

A chemical system that functions to control the levels of specific ions in solution. When the level of hydrogen ion in solution is controlled the system is called a pH buffer. (See all compounds classified as Buffers.)


5.3 FDA Pharmacological Classification
5.3.1 Pharmacological Classes
Inhibition Large Intestine Fluid/Electrolyte Absorption [PE]; Osmotic Activity [MoA]; Osmotic Laxative [EPC]; Potassium Compounds [CS]; Potassium Salt [EPC]; Increased Large Intestinal Motility [PE]
5.4 Absorption, Distribution and Excretion

Absorption

Potassium salts are well absorbed from gastro intestinal tract. Net phosphorus absorption may occur in the small intestine in some species but is primarily a function of the colon in horses.


Route of Elimination

Potassium is excreted primarily by kidney.


Volume of Distribution

Distribution is largely intracellular, but it is the intravascular concentration that is primarily responsible for toxicity.


Clearance

Phosphates are rapidly cleared by dialysis.


POTASSIUM SALTS ARE WELL ABSORBED FROM THE GASTROINTESTINAL TRACT. ... POTASSIUM IS EXCRETED PRIMARILY BY THE KIDNEY. /POTASSIUM SALTS/

McEvoy, G.K. (ed.). AHFS Drug Information 90. Bethesda, MD: American Society of Hospital Pharmacists, Inc., 1990 (Plus Supplements 1990)., p. 1425


Net phosphorus absorption may occur in the small intestine in some species but is primarily a function of the colon in horses. /SRP: Phosphates/

Booth, N.H., L.E. McDonald (eds.). Veterinary Pharmacology and Therapeutics. 5th ed. Ames, Iowa: Iowa State University Press, 1982., p. 640


/Ortho/ phosphate is absorbed from, and to a limited extent secreted into, the gastrointestinal tract. Transport of phosphate from the gut lumen is an active, energy-dependent process that is modified by several factors. ... Vitamin D stimulates phosphate absorption, an effect reported to precede its action on calcium ion transport. In adults, about two thirds of the ingested phosphate is absorbed, and that which is absorbed is almost entirely excreted into the urine. In growing children, phosphate balance is positive. Concentrations of phosphate in plasma are higher in children than in adults. This "hyperphosphatemia" decreases the affinity of hemoglobin for oxygen and is hypothesized to explain the physiological "anemia" of childhood. /Phosphates/

Hardman, J.G., L.E. Limbird, P.B. Molinoff, R.W. Ruddon, A.G. Goodman (eds.). Goodman and Gilman's The Pharmacological Basis of Therapeutics. 9th ed. New York, NY: McGraw-Hill, 1996., p. 1524


5.5 Metabolism/Metabolites

Phosphate is a major intracellular anion which participates in providing energy for metabolism of substances and contributes to important metabolic and enzymatic reactions in almost all organs and tissues.


5.6 Biological Half-Life

In healthy children with phosphate overdose, half-life was 4.8 to 10.6 hours, and was prolonged to 17 hours in a child with renal insufficiency.


5.7 Mechanism of Action

Once phosphate gains access to the body fluids and tissues, it exerts little pharmacological effect. If the ion is introduced into the intestine, the absorbed phosphate is rapidly excreted. If large amounts are given by this route, much of it may escape absorption. Because this property leads to a cathartic action, phosphate salts are employed as mild laxatives.


Once phosphate gains access to the body fluids and tissues, it exerts little pharmacological effect. If the ion is introduced into the intestine, the absorbed phosphate is rapidly excreted. If large amounts are given by this route, much of it may escape absorption. Because this property leads to a cathartic action, phosphate salts are employed as mild laxatives. Inorganic phosphate poisoning following ingestion of laxatives that contain phosphate salts has been reported in adults and children. Ingestion of large amounts of sodium dihydrogen phosphate lowers urinary pH. If excessive phosphate salts are introduced intravenously or orally, they may prove toxic by reducing the concentration of Ca 2+ in the circulation and from the precipitation of calcium phosphate in soft tissues. /Phosphates/

Hardman, J.G., L.E. Limbird, P.B. Molinoff, R.W. Ruddon, A.G. Goodman (eds.). Goodman and Gilman's The Pharmacological Basis of Therapeutics. 9th ed. New York, NY: McGraw-Hill, 1996., p. 1525


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