Effects during storage at 4 C were examined for selected
intrinsic carbohydrates in pressure-treated raspberry
puree. Fig. 1 shows a dramatic decrease of sucrose
during storage in the pressurised samples compared to 4
min heating, where losses are insignificant. Only the 800
MPa treatment allowed for considerable residual sucrose
levels after two and four weeks storage at 4 C.
Similar results were found by Kimura et al. for
(mainly added) sucrose in pressure-treated (400–500
MPa, 10–30 min) strawberry (not raspberry!) jam stored
at refrigerator temperature (4 C) with a reduction of the
sucrose content to below 10% within 60 days. In conventionally
produced jam (vacuum cooking at 70 C)
sucrose levels were still 80% (5 C) or ca. 70% (25 C)