Physicochemical and quality characteristics of Ulgeum-treated Gulbipo during low temperature(4℃, -20℃) storage were investigated. Ulgeum- treated and non-treated Gulbipo were analyzed by periodical measurements of pH, salinity, color values, volatile basic nitrogen, trimethylamine, peroxide values, ...
Physicochemical and quality characteristics of Ulgeum-treated Gulbipo during low temperature(4℃, -20℃) storage were investigated. Ulgeum- treated and non-treated Gulbipo were analyzed by periodical measurements of pH, salinity, color values, volatile basic nitrogen, trimethylamine, peroxide values, acid values, thiobarbituric acid reactive substances values, texture, sensory characteristics and total viable bacteria. Results are as follows: Moisture, ash, crude protein and crude fat contents of raw Yellow corvenia were 76.10%, 1.38%, 20.20% and 2.32%, respectively while the mineral contents were 23.26 ㎎% of Ca, 18.61 ㎎% of P, 9.58 ㎎% of K, 5.12 ㎎% of Na, 1.50 ㎎% of Mg and 0.02 ㎎% of Fe. pH was 6.62∼6.99 in Gulbipo samples and the salinity was 0.34% in raw Yellow corvenia, 2.33~2.94% in samples, respectively. In color measurement, L, a and b values were 50.53~61.83, 2.14~3.57 and 22.24~32.17, respectively. In volatile basic nitrogen(VBN) measurement of Gulbipos, it increased 24.86±2.26 ㎎% to 72.34±2.34 ㎎% and 2% Ulgeum-treated group was the lowest volatile basic nitrogen(VBN) values. In trimethylamine(TMA) measurement, it increased 0.96±2.24 ㎎% to 22.38±3.48 ㎎% in control, 10.00~17.08 ㎎% in Ulgeum-treated group. In peroxide value(POV) measurement, 27.75 meq/kg in control, 11.41~26.97 meq/kg in Ulgeum-treated group. In acid value(AV) measurement, 14.52 ㎎-KOH/g in control, 4.09~11.56 ㎎-KOH/g in Ulgeum-treated group. Thiobarbituric acid reactive substances(TBARS) values presented 2.90±0.05 ㎎/㎏ in control, 2.73~2.88 ㎎/㎏ in Ulgeum-treated group. Total viable bacteria in Gulbipo, 2.3×106 cfu/mL in control, in 6.5×104~8.4×105 cfu/mL in Ulgeum-treated group but after 7 week, increased to 6.2×106 cfu/mL in control, decreased to 2.0×104~ 8.8×104 cfu/mL in Ulgeum-treated group. Total viable bacteria in Gulbi-ganjangjangazzi(NaCl 7%) were 1.4×105 cfu/g after 1 week but after 6 week, decreased to 1.2×104 cfu/mL. In texture measurement, hardness, springiness, cohesiveness, gumminess and chewiness values were 2117.97~3906.08 g/㎠, 0.73~1.11 g/㎠, 0.54~0.65 g/㎠, 1717.48~2670.48 g/㎠ and 1213.82~ 3157.94 g/㎠, respectively. Based on sensory experiment, quality of 1% Ulgeum-treated Gulbipo was evaluated best in its fishy odor suppression, appearance, and overall acceptability. In this study Ulgeum was known as an effective Gulbipo's quality enhancer by suppression of fishy odor production.
Physicochemical and quality characteristics of Ulgeum-treated Gulbipo during low temperature(4℃, -20℃) storage were investigated. Ulgeum- treated and non-treated Gulbipo were analyzed by periodical measurements of pH, salinity, color values, volatile basic nitrogen, trimethylamine, peroxide values, acid values, thiobarbituric acid reactive substances values, texture, sensory characteristics and total viable bacteria. Results are as follows: Moisture, ash, crude protein and crude fat contents of raw Yellow corvenia were 76.10%, 1.38%, 20.20% and 2.32%, respectively while the mineral contents were 23.26 ㎎% of Ca, 18.61 ㎎% of P, 9.58 ㎎% of K, 5.12 ㎎% of Na, 1.50 ㎎% of Mg and 0.02 ㎎% of Fe. pH was 6.62∼6.99 in Gulbipo samples and the salinity was 0.34% in raw Yellow corvenia, 2.33~2.94% in samples, respectively. In color measurement, L, a and b values were 50.53~61.83, 2.14~3.57 and 22.24~32.17, respectively. In volatile basic nitrogen(VBN) measurement of Gulbipos, it increased 24.86±2.26 ㎎% to 72.34±2.34 ㎎% and 2% Ulgeum-treated group was the lowest volatile basic nitrogen(VBN) values. In trimethylamine(TMA) measurement, it increased 0.96±2.24 ㎎% to 22.38±3.48 ㎎% in control, 10.00~17.08 ㎎% in Ulgeum-treated group. In peroxide value(POV) measurement, 27.75 meq/kg in control, 11.41~26.97 meq/kg in Ulgeum-treated group. In acid value(AV) measurement, 14.52 ㎎-KOH/g in control, 4.09~11.56 ㎎-KOH/g in Ulgeum-treated group. Thiobarbituric acid reactive substances(TBARS) values presented 2.90±0.05 ㎎/㎏ in control, 2.73~2.88 ㎎/㎏ in Ulgeum-treated group. Total viable bacteria in Gulbipo, 2.3×106 cfu/mL in control, in 6.5×104~8.4×105 cfu/mL in Ulgeum-treated group but after 7 week, increased to 6.2×106 cfu/mL in control, decreased to 2.0×104~ 8.8×104 cfu/mL in Ulgeum-treated group. Total viable bacteria in Gulbi-ganjangjangazzi(NaCl 7%) were 1.4×105 cfu/g after 1 week but after 6 week, decreased to 1.2×104 cfu/mL. In texture measurement, hardness, springiness, cohesiveness, gumminess and chewiness values were 2117.97~3906.08 g/㎠, 0.73~1.11 g/㎠, 0.54~0.65 g/㎠, 1717.48~2670.48 g/㎠ and 1213.82~ 3157.94 g/㎠, respectively. Based on sensory experiment, quality of 1% Ulgeum-treated Gulbipo was evaluated best in its fishy odor suppression, appearance, and overall acceptability. In this study Ulgeum was known as an effective Gulbipo's quality enhancer by suppression of fishy odor production.
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