Water solubility enhancement of phthalates by cetyltrimethylammonium bromide and β-cyclodextrin

Details

• Personal Author:
  Li A ; Song W ; Xu X
• Description:
  Water solubility enhancements of six phthalates (five aliphatic phthalates and one phenyl phthalate) by cetyltrimethylammonium bromide (CTAB) and beta-cyclodextrin (beta-CD) were studied at 25 degrees C. The solubilities of these phthalates are remarkably enhanced by CTAB solutions above the critical micelle concentration (cmc). Only marginal enhancement of phthalate solubility was observed in solutions containing CTAB below its cmc and beta -CD at low concentrations (less than 5 mM). The solubility enhancements of the phthalates are proportional to the added amount of CTAB and beta -CD. Partition coefficients of the phthalates between monomeric CTAB surfactant and water (KMN) and between CTAB micelle and water (KMC) were estimated from the experimental data. The mechanisms of solubility enhancements by CTAB and beta-CD were discussed. A log-linear equation was proposed and evaluated for the solubilization by CTAB below cmc, while the previously proposed linear partitioning model was questioned. The structures of the complexes formed between phthalates and beta -CD were proposed, and the formation constants were estimated. The values of log KMC, log KMN, and log Kbeta -CD of the phthalates were found to correlate linearly with the log KOW of phthalates, with the exception of the solid phenyl phthalate. [Description provided by NIOSH]
• Subjects:
  Chemistry Fatty Acids Occupational Health Phthalic Acids Safety Surface-Active Agents Water Purification
• Keywords:
  Aliphatic-compounds Chemical-properties Chemical-synthesis Mathematical-models Models Phthalates Surfactants Water-analysis
• ISSN:
  0888-5885
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  Illinois ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  42
• Issue:
  5
• NIOSHTIC Number:
  nn:20038995
• Citation:
  Ind Eng Chem Res 2003 Feb; 42(5):949-955
• CAS Registry Number:
  Hexadecyltrimethylammonium bromide (CAS RN 57-09-0) ; β-Cyclodextrin (CAS RN 7585-39-9)
• Federal Fiscal Year:
  2003
• Performing Organization:
  University of Illinois at Chicago
• Peer Reviewed:
  False
• Start Date:
  20050701
• Source Full Name:
  Industrial & Engineering Chemistry Research
• End Date:
  20290630
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:56a6297305f34fca11b34bbf4d9f058df82709fef43e440722c5404e8d9273c26b4c3923d6956bf4295272fccdf1e1bf5d64db20a17abc6d3e59fa19781fba2a
• Download URL:
  https://stacks.cdc.gov/view/cdc/192499/cdc_192499_DS1.pdf
• File Type:
  [PDF - 114.51 KB ]