Evaluation of the stability of creatine in solution prepared from effervescent creatine formulations

Sudipta Ganguly, Sheela Jayappa, Alekha K. Dash

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The objectives of this study were to determine the cause of the crystallization in a large volume creatine supplement solution made from effervescent powders containing di-creatine citrate, and to characterize these crystals using thermal analyses and x-ray diffractometry. Creatine effervescent powders were dissolved in deionized water (pH 6.2) and stored both at room temperature (RT) (25°C) and refrigerated condition (4°C) over a period of 45 days. Creatine concentration was determined using high-performance liquid chromatography (HPLC). Intrinsic dissolution and saturated solubility of creatine, creatine monohydrate, and di-creatine citrate in water were determined and compared. Crystal growth was detected only in the refrigerated samples on the seventh day of storage. Differential Scanning Calorimetry (DSC) and x-ray diffraction (XRD) studies revealed that the crystals formed were of creatine monohydrate. Ninety percent creatine degradation was observed within 45 days for RT samples. However, at refrigerated condition this degradation was 80% within the same time period. The pH of the RT samples also increased from 3.6 to 4.5 during storage. No such increase was observed in the case of refrigerated samples. The intrinsic dissolution rate constants of the compounds decreased in the following order: di-creatine citrate > creatine > creatine monohydrate. In conclusion, di-creatine citrate used in effervescent formulation dissociates to creatine in aqueous solution and eventually crystallizes out as creatine monohydrate. Significant decrease in solubility and effect of pH contribute to this crystallization process.

Original languageEnglish
JournalAAPS PharmSciTech
Volume4
Issue number2
StatePublished - 2003

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creatine
Creatine
Citric Acid
citrates
Crystallization
crystals
ambient temperature
crystallization
Powders
Solubility
Temperature
solubility
powders
X-radiation
X-Rays
sampling
degradation
Water
Differential Scanning Calorimetry
differential scanning calorimetry

All Science Journal Classification (ASJC) codes

  • Molecular Medicine
  • Pharmaceutical Science

Cite this

Evaluation of the stability of creatine in solution prepared from effervescent creatine formulations. / Ganguly, Sudipta; Jayappa, Sheela; Dash, Alekha K.

In: AAPS PharmSciTech, Vol. 4, No. 2, 2003.

Research output: Contribution to journalArticle

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