Impact of Different Cooking Methods on Food Quality - Retention of Antioxidant Compound in Black Carrot -

조리 방법에 따른 자색 당근의 품질 특성 및 항산화능의 변화 - 조리 방법에 따른 항산화 잔존량 -

Abstract

In this paper, quality properties and antioxidant capacity of cooked black carrot has been studied. Five different cooking methods have been applied: microwave (45 sec), boiling ($100^{\circ}C$, 14 min), steaming ($100^{\circ}C$, 20 min), sous vide ($75^{\circ}C$, 80 min), sous-vide ($95^{\circ}C$, 30 min). The color value was slightly different (p<0.05), the boiling method was the highest in L-value and Sous vide $75^{\circ}C$ method was the lowest. The steaming method indicated the highest a-value at 5.50. The b-value was significantly different between the samples (p<0.05). The microwave method was the highest at 3.49 while the sous vide $95^{\circ}C$ method was the lowest at -0.34. No significant difference was observed between the samples when only the moisture content results were considered. The highest pH was observed in samples cooked using the boiling method. The softening (%) was higher when the cooking water was in contact with samples and it was dependent on the temperatures. In addition, this study shows that not only temperature but also cooking time and cooking media are very crucial in the preparation and cooking of black carrot to prevent the loss of the antioxidant compound. In conclusion, the comparison of the quality characteristics and antioxidant properties of black carrots indicated that the most appropriate cooking method is sous-vide method.

Fig. 1. Photograph of black carrot by different cooking method.

Table 1. Comparison of 5 different cooking methods

Table 2. Moisture content, pH, softening of black carrot by different cooking method

Table 3. Color values of black carrot by different cooking method

Table 4. Antioxidant power of black carrot by different cooking method