Abstract：
:Blackcurrant (Ribes nigrum) jam was manufactured with the aim of producing a jam with a low sugar content, and without any additives. Four temperatures were investigated, namely 60 degrees C, 76 degrees C, 92 degrees C and 97 degrees C. Processing time varied between 1-20 min. After processing, the highest content of ascorbic acid was found in the jam processed at 97 degrees C for 1 min, which contained 63.3 +/- 2.6 mg ascorbic acid/100 g jam. At all combinations investigated more than 60% of the original amount of ascorbic acid was retained after manufacturing and packaging. The jam made at 92 degrees C was stored in a shelf-life study for 13 months. The jam was then stored at 8 degrees C, ambient temperature and at 37 degrees C. At ambient temperature the jam was stored both in dark and in daylight, at 8 degrees C and at 37 degrees C the jam was stored in dark. After 13 months of storage, at 8 degrees C, 60% of the amount of ascorbic acid and 29% of the amount of anthocyanins were retained. In the jam stored at higher temperatures less of both was retained. The beta-carotene in the jam was found to be stable throughout the whole shelf-life study. Exposure to light did not have any effect on any of the components studied. The degradation of anthocyanins was best described by a second-order reaction and the activation energy was determined to be 90 kJ/mol. A jam of blackcurrant may be considered as a good source of vitamins and antioxidants after one year, if certain precautions concerning manufacture and storage conditions are taken.
journal_name
Int J Food Sci Nutrjournal_title
International journal of food sciences and nutritionauthors
Viberg U,Ekström G,Fredlund K,Oste RE,Sjöholm Idoi
10.3109/09637489709006964subject
Has Abstractpub_date
1997-01-01 00:00:00pages
57-66issue
1eissn
0963-7486issn
1465-3478journal_volume
48pub_type
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