Background and objectives: Okara and hydroxypropyl methylcellulose (HPMC) were added to jeungpyun, a steamed rice cake, as fermentation enhancers. Three types of jeungpyun were prepared: containing only rice (C), with okara added (O), and okara treated with HPMC (OH). Findings: During fermentation, the OH batter had the highest volume, followed by O and C; particularly OH maintained its volume without batter collapse after 2 hrs. The viscosity (C: 446, O: 575, OH: 991 cP) and water-holding capacity (C: 2.9, O: 8.7, OH: 17.2%) of batter also showed the same tendency with volume. After steaming, the volume of OH jeungpyun was the highest (1.7 cm 3 /g), followed by O (1.5 cm 3 /g) and C (1.4 cm 3 /g). The sensory panel scores of the okara treated samples were 1.8 (OH)-2.4 (O) fold lower in hardness than C. Addition of okara decreased the hardness and the rate of hardening of jeungpyun during storage, particularly in OH. Conclusions: Okara improved the fermentation of batter, and improved the hardness and volume of jeungpyun. HPMC stabilized the batter and maintained the volume. Significance and novelty: This study suggests the application of okara as a fermentation source and its impact on quality effect.
K E Y W O R D Sfermentation, hydroxypropyl methylcellulose, okara, rice cake, texture improver