Anion Composition of Açaı́ Extracts

• Published in: Journal of agricultural and food chemistry Vol. 61; no. 25; pp. 5928 - 5935
• Main Authors: Liao, Hongzhu, Shelor, C. Phillip, Chen, Yongjing, Sabaa-Srur, Armando U. O, Smith, Robert E, Dasgupta, Purnendu K
• Format: Journal Article
• Language: English
• Published: American Chemical Society 26.06.2013
• Subjects: malate; phytic acid; açaı́; inositol hexaphosphate; ion chromatography; tartrate
• ISSN: 0021-8561; 1520-5118
• DOI: 10.1021/jf4014185

Many products labeled açaı́ are presently marketed as natural supplements with various claimed health benefits. Authentic açaı́ is expensive; as a result, numerous products labeled as containing açaı́ are being sold that actually contain little or no açaı́. Authentic açaı́ samples from Brazil and Florida as well as several reputed açaı́ products were analyzed by suppressed conductometric anion chromatography. Columns with different selectivities were used to obtain a complete separation of all anions. Tandem mass spectrometry was used for confirmation of the less common ions. Quinate, lactate, acetate, formate, galacturonate, chloride, sulfate, malate, oxalate, phosphate, citrate, isocitrate, and myo-inositol hexakisphosphate (phytate) were found. Only the Florida açaı́ had detectable levels of hexanoate. No açaı́ sample had any detectable levels of tartrate, which is present in abundance in grape juice, the most common adulterant. The highly characteristic anion profile and in particular the absence of tartrate can readily be used to identify authentic açaı́ products. Açaı́ from Florida had a 6 times greater level of phytate. The present analytical approach for phytate may be superior to extant methods.