Cranberry extract - Organic acids A unit of NIST-3283 consists of five packets, each containing approximately 2.5 g of cranberry extract. Certified mass fraction values for organic acids (dry-mass basis) Citric acid ......................................... 18.7 ± 2.3 mg/g Quinic acid ....................................... 16.6 ± 3.7 mg/g Malic acid ........................................... 9.9 ± 1.2 mg/g Indicative values for organic acids and anions