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Process Optimization of Vacuum Fried Rice-Straw Mushroom (Volvariella Volvacea) Stem Chip Making



Author(s)

Subarna Suryatman and Adil Basuki Ahza

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DOI:10.17265/2159-5828/2016.03.001

Department of Food Science and Technology, Bogor Agricultural University, 1 Kamper Street, IPB-Darmaga Campus, Bogor 16680, Indonesia

The study was aimed to obtain the optimum conditions for vacuum frying and predicting the moisture lost during rice straw mushrooms stem chip production. The raw materials were obtained from the local farmer around the campus. A completely randomized factorial experimental design and Duncan’s multiple range tests were used to achieve the objectives. Three temperatures, i.e. 80, 90 and 100 °C and five frying time, i.e. 3, 6, 9, and 15 minutes with a 2 mm slice thickness were studied to determine the optimum condition and predict the moisture decrease. Results showed that the vacuum frying time in general affects the chips color and oil uptake significantly (p < 0.01) and correlated with the moisture decrease. The chips moisture content decline significantly after vacuum frying at 90 °C and 100 °C for 3 minutes. While for the 80 °C vacuum frying, the significant decrease of moisture occurred due to the increase of vacuum frying time from 3 to 6 minutes (p < 0.01). The optimum conditions for a 2 mm slice thickness chips making are vacuum frying at 100 °C for 3 minutes. The chips moisture lost followed generally a two-stage of falling rate pattern during vacuum frying, and each could be well predicted by an exponential equation (R2 = 0.99).

Fried rice straw, moisture lost, process optimization, vacuum frying.