Page 118 - Analytical method for food addtives

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13
10
Absorbance ratio (254/240 nm) for benzoic acid = 0.196±0.005
Samples analysed in triplicate for sodium benzoate: range
Cola drink 1: Benzoic acid 39.3 µg/mL RSD 1.5 % (n=3)
Cola drink 2: Benzoic acid 287 µg/mL RSD 1.2 % (n=3)
g SD=0.337
g/100
g, mean 0.17
g/100
0.01–12.5
Precision of method established 23 Recoveries of benzoic acid from wine and juices spiked at ppm averaged 98 % CV ranged from 2–5 % 50–300 and applied to commercial samples 4 Recovery of spiked fruit vinegar (n=6) 76 % (RSD=8.0 %) Precision of method established ppb Detection limit 0.1 and applied to real samples 24 Detection limit
Method applied to cola samples
Method applied to commercial
Method applied to commercial
samples in Indonesia (n=16)
samples in Portugal (n=6)
(n=2)
Beverages Foods Beverages Syrup Yogurt, non- alcoholic beverages and fruit juices Quince jam Fruit juices Cola beverages and jams Cranberry juice

HPTLC GC–MS (SIM) Potentiometric using a selective electrode HPLC HPLC HPLC HPLC Micellar electrokinetic chromatography (MECC) HPLC