The primary vitamin in sea buckthorn berries is vitamin C containing values of approximately 400 mg/100 g. Processing effects were investigated during juice and concentrate production from sea buckthorn berries (Hippophaë rhamnoides) and storage stability of juices was determined for up to 7 d using berries and juices from 2 different growing areas. During industrial juice production the technological processing of the berries caused a loss of about 5% to 11% total ascorbic acid (TAA) in the generated juice. The production of the concentrated juice resulted in 50% depletion of TAA. Sea buckthorn berries and juice were stored at 6, 25, and 40 degrees C for up to 7 d to investigate the temperature effects on TAA during storage. Analysis of kinetic data suggested that the degradation follows a 1st-order model. The results of the experiments showed that storage of sea buckthorn juices for 7 d at cold temperature (6 degrees C) already resulted in a degradation of TAA of about 11% to 12%.
Phylloquinone (vitamin K(1)) is the primary dietary source of vitamin K. Processing effects and stability of phylloquinone were investigated during juice and concentrate production from sea buckthorn (Hippophaë rhamnoides) using berries from 2 different growing areas. During industrial juice production the technological processing of the berries caused a loss of about 36% to 54% phylloquinone in the generated juice. The following processing steps leading to the concentrated juice resulted in a complete depletion of phylloquinone. Sea buckthorn berries and juice were stored at 6, 25, and 40 degrees C for up to 7 d to determine the temperature effects on phylloquinone during storage. Content of vitamin K(1) in sea buckthorn berries was affected by storage time and storage temperature. Storage of freshly harvested berries resulted in a significant increase (P < 0.01) of phylloquinone ranging from 21% up to 186% (wet weight). The juices showed almost identical significant degradation (P < 0.01) of phylloquinone of about 18% to 32% at 6, 25, and 40 degrees C indicating that intensity of decomposition is independent of temperature (6 to 40 degrees C) and storage time in the range of consumer storage conditions.
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