Abstract
The quality characteristics of pork patty prepared with chitosan containing preservatives during storage at $4^{\circ}C$ were investigated to improve its functional property and shelf life using food preservatives of natural origin (PI; 0.1% chitosan, 2.5% citric acid, 100 ppm grapefruit seed extract, 0.2% adipic acid, 0.1% Cinnamomum extract, D.W. 97.09% and PII; 0.1% chitosan, 2.5% citric acid, 100 ppm grapefruit seed extract, 0.2% adipic acid, 0.1% Lysimachia christinae Hance extract, D.W. 97.09%). The sensory qualities (taste, appearance, texture and overall acceptability) of patties preserved with PI (1, 3 and 5%) and PII (1, 3 and 5%) were also investigated. The taste and overall acceptability of patties prepared with 1% PI and 1% PII were higher than those of the control. The DPPH radical scavenging activities of the control, 1% PI and 1% PII treated patties were 13.54%, 21.78% and 14.07%, respectively. The total aerobes and coliform count of patties preserved with 1% PI were $10^4$ CFU/g and $10^2$ CFU/g, respectively, after 10 days storage at $4^{\circ}C$. Cooking loss from 1% PI and 1% PII treated patties was lower than that of from the control. Water holding capacity was the highest for 1% PI (65.84%), followed by 1% PII and then the control. The shelf life of patties prepared with 1% PI and 1% PII was extended by about 5 days relative to the control at $4^{\circ}C$.
Chitosan 함유 보존제를 각각 1%, 3%, 5% 첨가하여 제조한 patty의 관능검사 결과, 맛과 종합적 기호도의 경우 PI-1 처리구, PII-1 처리구가 대조구보다 유의적으로 높은 값을 나타내었다. DPPH 라디칼 소거능은 대조구, 1% PI-1 처리구, 1% PII-1 처리구가 각각 13.54%, 21.78%, 14.07%로 PI-1 처리구가 대조구보다 유의적으로 높았다. 총균수는 저장 10일째 PI-1 처리구는 $10^4$ CFU/g으로 대조구보다 약 1 log cycle 낮았으며, 대장균군수는 저장 10일째 PI-1 처리구가 2.98 log CFU/g으로 가장 낮았으며, 다음은 PII-1 처리구 낮았다. 가열 감량은 PI-1 처리구와 PII-1 처리구가 대조구보다 낮았고, 저장기간이 경과할수록 유의적으로 감소하는 경향을 나타내었다. 보수력은 PI-1 처리구가 65.84%로 가장 높았으며, 저장기간 동안 대조구보다 높은 값을 유지하였다. 휘발성 염기태 질소는 대조구가 5일째까지, 보존제 처리구는 10일째까지 가식권의 한계치 이하로 나타났다. L 값은 저장기간 동안 뚜렷한 변화는 나타나지 않았고 a 값은 저장 5일째부터 급격히 낮아졌으며, b 값은 저장기간 동안 서서히 증가하는 경향을 나타내었다.
