Improved procedure for cleaning glassware used in determining the stability of fats and oils by the active oxygen method

Abstract

Summary Glassware cleaned with a synthetic detergent instead of hot or cold chromic‐sulfuric acid leads to improved reproducibility of the stability of fats and oils determined by the active oxygen method. When the glassware used in this method is cleaned with hot chromic‐sulfuric acid, chromium compounds are absorbed within the glass walls and subsequently diffuse into the oil or fat thereby leading to erratic results. A method is described for cleaning the glassware used with the fat stability method which has given reliable results in the hands of the authors for more than a year, during which it has been in almost daily use.

On the kinetics of the autoxidation of fats: influence of pro‐oxidants, antioxidants and synergists

“…This aspect is not generally discussed but there are some directions about glass cleaning in old literature suggesting use of carbon tetrachloride for degassing, hot alkaline detergents or sulfuric acid-chromic acid mixtures, or EDTA followed by proper rinsing with water and distilled water [23][24][25]. x is the weight gain in mg. § n in equations (7) and (9) is calculated from an IV of 130 meq/kg and one oxygen per double bond.…”