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Comparison of isothermal and cycling temperature storage of filled dark chocolate products for accelerated shelf life prediction
Author(s) -
Rothkopf Isabell,
Schütz Barbara,
Danzl Wolfgang,
Ziegleder Gottfried
Publication year - 2017
Publication title -
european journal of lipid science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.614
H-Index - 94
eISSN - 1438-9312
pISSN - 1438-7697
DOI - 10.1002/ejlt.201600481
Subject(s) - shelf life , isothermal process , bloom , cycling , dark chocolate , environmental science , crystallization , process engineering , materials science , chemistry , food science , thermodynamics , engineering , geology , physics , oceanography , archaeology , organic chemistry , history
Beside a loss in texture, the main quality aspect of filled chocolate products during storage is the development of fat bloom. For these products isothermal or cycling temperature storage tests are used for accelerated shelf life prediction. However, the applicability of these tests compared to real storage conditions is complicated and shelf life estimation is vague. Com;1;paring storage tests of different authors is difficult because products and analysis methods vary. Additionally most of the storage tests are performed to identify the reasons for fat bloom and therefore the storage conditions are not separately investigated. However, all studies agree that temperature has a major impact due to its influence on migration and crystallization. While migration is accelerated at higher temperatures, crystallization shows an optimum at lower temperatures. Therefore, migration and crystal state have to be evaluated during storage, as well as fat bloom formation. In this study, cold stamped dark chocolate shells with nougat filling were chosen to compare isothermal and cycling temperature storage conditions. Cycling temperature storage at adequate levels includes optimum for fat bloom formation, but takes crystallization and migration influence in unequal account. In contrast, isothermal storage at optimum temperature leads to faster fat bloom formation. Practical applications: A precise shelf life prediction helps to reduce food waste. Shelf life estimation is relevant to almost all chocolate manufacturers. Increasing quality standards accompanied by shortened development time demand accelerated tests for shelf life prediction. Conventional storage tests are too expensive and time‐consuming, especially for small and medium‐sized enterprises, which often sell premium filled chocolate products. Additionally a short time to market is needed to be capable of competing. In the present study different accelerated storage tests were compared. The results can be used to choose the relevant test for new developed products and optimization of existing products and processes. In filled pralines storage is a complex interaction of migration and crystallization, which is highly depending on temperature and temperature fluctuation