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MINERAL AND WATER‐SOLUBLE VITAMIN CONTENT OF RABBITEYE BLUEBERRIES
Author(s) -
EITENMILLER R. R.,
KUHL RUTH F.,
SMIT C. J. B.
Publication year - 1977
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.1977.tb14485.x
Subject(s) - chemistry , niacin , riboflavin , pantothenic acid , ascorbic acid , food science , pasteurization , vitamin , composition (language) , biochemistry , linguistics , philosophy
Concentrations of 10 minerals (K, Ca, Mg, Mn, Na, Fe, Zn, Co, Ni and Cu) and 8 vitamins (ascorbic acid, folacin, biotin, riboflavin, thamine, niacin, pantothenic acid and B 6 ) were determined in varieties of Rab‐biteye blueberries ( Vaccinium aslzei ). The Rabbiteye varieties included Bluebelle, Briteblue, Climax, Delite, Southland, Tifblue and Woodland. Potassium was present in greatest concentration, averaging 974 ppm on a wet weight basis. Calcium and magnesium averaged 59.7 ppm and 55.7 ppm, respectively. Average Zn content was 1.1 ppm and Cu content averaged 0.66 ppm. Co and Ni were not present at detectable levels. Ascorbic acid content averaged 12.6 mg/100g for the 7 varieties. Of the B‐vitamins, niacin was present in greatest quantity, averaging 0.36 mg/100g. Compared to other fruits and vegetables, blueberries cannot be considered an outstanding source of any micronutrient. Studies on the stability of water‐soluble vitamins during UHT pasteurization and subsequent storage of blueberry juice indicated niacin, riboflavin, pantothenic acid, and biotin to be most stable to the pasteurization treatment (200°F for 3 sec). During storage at room temperature and 4°C, niacin, riboflavin and ascorbic acid showed good stability. B 6 and free folacin contents and their retention were affected by pasteurization and storage. Retention of B 6 and folacin after pasteurization was 66.9% and 36.5%, respectively. After 6‐months storage at ambient temperature, retention of B 6 had decreased to 29.3% and free folacin had decreased to 15.9% retention.