Impact of blanching pretreatment on physicochemical properties, and drying characteristics of cabbage (Brassica oleracea)
2021
Roy, M. | Rahman, S. | Alam, M. | Hossain, M. A. | Sarkar, A. | Ahmed, T.
Cabbage (Brassica oleracea) is popular winter vegetables cultivated all over Bangladesh and contains essential nutrients. This study aimed to evaluate the efficacy of pre-blanching on the preservation of cabbage by drying. In this research work, cabbage was blanched at 80°C, 90°C, and 100°C temperature for 12, 8, and 2 mins, respectively. Then the samples were dried at 60°C maintaining 60% relative humidity. The moisture and ash content of untreated and treated dried samples was in the range of 16.07±0.04 to 10.80±0.01% and 5.71±0.06 to 3.81±0.02%, respectively. The total phenolic content in cabbage was 74.47±0.63 mg GAE/100g at 100°C blanching temperature for a short time of 2 mins, which was higher compared to 61.91±0.48 mg GAE/100g at 80°C for 12 mins. It was observed that the antioxidant activity and two water-soluble vitamins-ascorbic acid and beta carotene decreased in pre-blanched dried samples in contrast with fresh ones. Blanching at higher water temperature and a short period was found useful for the retention of total phenolic content and greenness of cabbage. Blanching pre-treatments were also found to have better color retention capacity than untreated dried cabbage. A proper combination of drying time and temperature, along with the incorporation of blanching pretreatment, might be useful to preserve cabbage for a long time.
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