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Quantitative analysis of oil removal from cotton fabrics through the in situ formation of microemulsions by solid‐state nuclear magnetic resonance
Author(s) -
Joubran Remon,
Parris Nicholas,
Dudley Robert,
Cooke Peter
Publication year - 1995
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02541028
Subject(s) - microemulsion , pulmonary surfactant , soybean oil , chemistry , aqueous solution , aqueous two phase system , chromatography , materials science , nuclear chemistry , organic chemistry , biochemistry , food science
Solubilization and subsequent removal of soybean oil from cotton fabrics through the in situ formation of microemulsions were evaluated by solid‐state nuclear magnetic resonance (NMR) spectrometry. Regions of water‐in‐oil and oil‐in‐water microemulsions were identified for systems that contained polyoxyethylene (60) sorbitol hexaoleate, soybean oil, and an aqueous phase composed of water/ethanol or isopropanol (80:20 wt%) at 25°C. The amount of oil removed from the cotton fabrics was determined by solid‐state NMR after constructing a calibration curve relating the intensity of camphor/oil NMR signals (I c /I o ) to their molar ratio (M c /M o ). A precision Crockmeter (Mul‐Tech Industries, New York, NY) was used to reproducibly remove soybean oil stain from cotton fabric, which was subsequently analyzed by NMR. Typically, more than 90% of the oil stain was removed after 200 revolutions of the Crockmeter finger with 2 wt% surfactant at 25°C. Increasing the amount of surfactant to 6 wt% improved soybean oil removal from the fabric to 99 wt%.