Determination of extra virgin olive oil acidity by FIA-titration

Optimisation of red pepper seed oil extraction using supercritical CO2 and analysis of the composition by reversed-phase HPLC-FLD-MS/MS

“…Determination of FFA in edible oils and fats has been investigated (Cocito & Delfini, 1994; Ai, 1997; Man & Moh, 1998; Mariotti & Mascini, 2001; Kondyli et al. , 2002; Poveda & Cabezas, 2006; Saad et al.…”

Digital movie-based on automatic titrations

“…However, the throughput rate remained limited due to the manual addition of titrant and samples. By using several flow-based approaches for several analytes [3,[6][7][8][9][10][11][12][13][14][15], the development of automatic and miniaturized systems for carrying out titrations solved these problems, especially for determination of acidity in edible oils [2,16,17].…”

Application of Flow Injection Gradient Titration Based on the Standard Addition and Dilution Procedure to the Determination of Total Acidity in Vinegars and Soft Drinks

“…Some authors have classified this titration as "pseudotitration". [5][6][7][8][9] Flow injection gradient titration has been exploited for various determinations, among them systems can be found for determination of: acids; [10][11][12] acidity in: vinegars, 12 raindrops, 13 oils 14,15 and fruit juice; 16 surfactants; 9,17 amines and their salts; 8 and phenothiazine derivatives. 18 The principles of various procedures dedicated to acidity determination using flow injection titration are similar; however, various instrumental solutions can be found.…”

“…In the examples cited above, a small volume (between 4.5 13 and 500 12 mL) of undiluted sample or sample diluted by an organic solvent 15 is injected into a stream of titrant (usually a solution of sodium or potassium hydroxide). In the case of spectrophotometric detection, an indicator (phenolphthalein, 12,[14][15][16] m-cresol purple 13 ) is added to the titrant directly [12][13][14] or a stream of titrant is mixed with a stream of indicator. 15,16 The linear correlation between analytical signals measured as widths 12,15 or areas 14,16 of the signals registered and the logarithm of sample acidity is observed over a relatively wide acidity range.…”

“…In the case of spectrophotometric detection, an indicator (phenolphthalein, 12,[14][15][16] m-cresol purple 13 ) is added to the titrant directly [12][13][14] or a stream of titrant is mixed with a stream of indicator. 15,16 The linear correlation between analytical signals measured as widths 12,15 or areas 14,16 of the signals registered and the logarithm of sample acidity is observed over a relatively wide acidity range. Depending of the composition of the sample of which the acidity is determined, acetic, 12 citric, 16 linoleic 14 or other acids can be applied as standards for calibration purposes.…”