Optimization of double-cooking condition for low potassium potatoes using response surface methodology (RSM)

Area of Science:

• Food Science and Technology
• Nutritional Science

Background:

• Potassium reduction is crucial for chronic kidney disease (CKD) patients.
• Traditional cooking methods may not sufficiently reduce potassium or maintain texture.

Purpose of the Study:

• To establish optimal double-cooking conditions for potatoes.
• To maximize potassium reduction rate while maintaining hardness.
• To investigate the impact of cooking parameters on potato quality attributes.

Main Methods:

• Response surface methodology (RSM) with a central composite design was employed.
• Varied first cooking time (4.5-5.5 min) and rinsing time (20-60 s).
• Analyzed potassium reduction rate, hardness, and color (b-value) using RSM and Scanning Electron Microscopy (SEM).

Main Results:

• Optimal conditions identified: 5.5 min first cooking and 57.57 s rinsing.
• Increased first cooking time enhanced potassium reduction but decreased hardness and b-value.
• SEM showed a more organized, netted structure in double-cooked potatoes, aiding hardness retention.

Conclusions:

• The established double-cooking method effectively reduces potassium in potatoes.
• This method offers a promising strategy to broaden dietary choices for CKD patients.
• Optimized cooking parameters balance potassium leaching with textural integrity.