Method 986.13

Quinic, Malic, and Citric Acids in Cranberry Juice Cocktail and Apple Juice

This method is for the determination of quinic, malic and citric acid from cranberry juice cocktail and apple juice.  The sample.  The sample is extraction using a solid-phase extraction.  The juice is diluted with water and passed through a disposable cartidge (Sep Pak C18 or equivalent), filtered and analyzed by high performance liquid chromatography (HPLC) with UV detection.

Note that many labs modify the method to analyze for other organic acids such as acetic, fumaric, glutaric, lactic, oxalic, suucinic, and tartaric.



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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   None specified in the method.
Preservatives:   None specified in the method.
Required Preps:   125mL Glass bottle with Teflon-lined lid
Collection Method:   Grab sampling
Analytical Methodology:   HPLC

Analyte List*

Analyte Formula CAS Number Detection Limit
Malic acid
Citric acid
Quinic acid

* The analytes and detection limits listed for each method represent the typical detection limits and analytes reported for that particular method. Keep in mind that analyte lists may vary from laboratory to laboratory. Detection limits may also vary from lab to lab and are dependent upon the sample size, matrix, and any interferences that may be present in the sample.