Objective To study the effect of acidic calcium sulfate (ACS) on disease suppression and quality of dried apricot during storage, and to provide theoretical basis for disease prevention and control and quality maintenance of dried fruit during storage.
Methods The effects of ACS dilutions at concentrations of ACS-10−1 (pH 0.68), ACS-10−2 (pH 1.36) and ACS-10−3 (pH 2.04) were determined on the growth of Aspergillus niger (A. niger), Aspergillus flavus (A.flavus), Aspergillus ochraceus (A. ochraceus) and Penicillium italicum (P. italicum) on mycelial growth and spore germination rate. Dried apricots of Xinjiang 'Saimaiti' were used as test material, and the dried apricots were inoculated with ACS dilution 1000 Pa decompression immersion, and the morbidity of the dried apricots was counted; the effect of ACS decompression immersion on the maintenance of storage quality of dried apricots was evaluated.
Results ACS-10−1 (pH 0.68) completely inhibited mycelial growth and spore germination of four pathogenic bacteria. For 13 d of storage, the incidence of ACS decompression dipping was reduced by 86.67%, 73.33% and 6.67% in each treatment group compared to the control group, respectively. After 60 d of storage, the total color difference (ΔE) and browning degree of dried apricots in the ACS-10−1 (pH 0.68) decompression immersion treatment group were 46.56% and 9.40% lower than that of the control group, delaying the decrease of total soluble solids (TSS) content, moisture, reducing sugar, titratable acid (TA), Ascorbic acid (AsA), carotenoids, total phenols and flavonoids contents were 7.24%, 22.03%, 16.58%, 11.63%, 9.72%, 1.88% and 1.33% higher than that of the control group, respectively.
Conclusion ACS decompression soaking treatment was effective in reducing the incidence of dried apricot diseases and maintaining the appearance and nutritional quality of dried apricots, and ACS-10−1 (pH 0.68) was screened as the optimal treatment concentration.
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