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. 2009 Aug;10(8):580-8.
doi: 10.1631/jzus.B0920051.

Effects of Different Cooking Methods on Health-Promoting Compounds of Broccoli

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Free PMC article

Effects of Different Cooking Methods on Health-Promoting Compounds of Broccoli

Gao-feng Yuan et al. J Zhejiang Univ Sci B. .
Free PMC article

Abstract

The effects of five domestic cooking methods, including steaming, microwaving, boiling, stir-frying, and stir-frying followed by boiling (stir-frying/boiling), on the nutrients and health-promoting compounds of broccoli were investigated. The results show that all cooking treatments, except steaming, caused significant losses of chlorophyll and vitamin C and significant decreases of total soluble proteins and soluble sugars. Total aliphatic and indole glucosinolates were significantly modified by all cooking treatments but not by steaming. In general, the steaming led to the lowest loss of total glucosinolates, while stir-frying and stir-frying/boiling presented the highest loss. Stir-frying and stir-frying/boiling, the two most popular methods for most homemade dishes in China, cause great losses of chlorophyll, soluble protein, soluble sugar, vitamin C, and glucosinolates, but the steaming method appears the best in retention of the nutrients in cooking broccoli.

Figures

Fig.1
Fig.1
The chlorophyll content in broccoli cooked by different methods Each value is mean±SD of three replicate samples. Values not sharing a common letter are significantly different at P<0.05. Cooking methods: 1. Raw; 2. Boiled; 3. Streamed; 4. Microwaved; 5. Stir-fried; 6. Stir-fried/boiled
Fig.2
Fig.2
The contents of total soluble proteins and soluble sugars in broccoli cooked by different methods Each value is mean±SD of three replicate samples. Values not sharing a common letter are significantly different at P<0.05. Cooking methods: 1. Raw; 2. Boiled; 3. Streamed; 4. Microwaved; 5. Stir-fried; 6. Stir-fried/boiled
Fig.3
Fig.3
The contents of vitamin C and total carotenoids in broccoli cooked by different methods Each value is mean±SD of three replicate samples. Values not sharing a common letter are significantly different at P<0.05. Cooking methods: 1. Raw; 2. Boiled; 3. Streamed; 4. Microwaved; 5. Stir-fried; 6. Stir-fried/boiled
Fig.4
Fig.4
The contents of total aliphatic and indole glucosinolates in broccoli cooked by different methods Each value is mean±SD of three replicate samples. Values not sharing a common letter are significantly different at P<0.05. DW: dry weight. Cooking methods: 1. Raw; 2. Boiled; 3. Streamed; 4. Microwaved; 5. Stir-fried; 6. Stir-fried/boiled

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