살균방법이 철분강화 우유의 저장중 품질변화에 미치는 영향

국문 초록 (Abstract)

살균방법이 철분강화 우유의 품질에 미치는 영향을 평가하고자 ferric citrate, ferric ammonium citrate, ferrous lactate를 우유에 100ppm 수준으로 첨가하고 HTST, LTLT법으로 살균하였다. 살균된 철분강화 우유를 4℃에 저장하면서 pH, 지방산화도, 색도변화, 관능적 특성 품질을 평가한 결과 pH변화는 HTST, LTLT법 모두에서 6.74~651 범위였고 대조구, ferric ammonium citrate, ferrous lactate, ferrous sulfate, ferric citrate 순으로 높았다. 지방 산화도의 경우 ferric ammonium citrate, ferric citrate가 산소소비량이 작은 것으로 나타났고 ferrous lactate, ferrous sulfate는 좀더 산소소비량이 큰 것으로 나타나 지방 산화 정도가 큰 것으로 평가되었다. 이와 같은 경향은 살균법에 관계없이 일치하였으나 전체적으로 산소소비량은 LTLT법이 HTST법보다 낮았다. 색도변화에서는 ferrous lactate가 두가지 살균법 모두에서 우수한 것으로 나타났으며 관능적 특성에서도 이취, 색변화에서 우수하였고 ferrous sulfate가 가장 불량한 것으로 나타났다(p＜0.05). 이상의 결과에서 철분강화 우유 제조시 LTLT법이 HTST법보다 우수하였고 철분염은 ferrous lactate가 비교적 우수하였으나 ferrous sulfate는 제품의 품질 면에서 좋지 않은 것으로 나타났다.

다국어 초록 (Multilingual Abstract)

To evaluate the effect of sterilizing method on the quality of iron fortified market milk, HTST(high temperature, short time) or LTLT(low temperture, long time) method was adopted after addition of 100ppm ferrous sulfate, ferric citrate, ferric ammonium citrate, or ferrous lactate in market milk. Sterilized iron fortified market milk was stored at 4℃ and then pH, lipid oxidation, color change, and sensory quality were observed. The range of pH change in iron fortified market milk sterilized by HTST or LTLT was 6.51~6.74. The order of pH was control>ferric ammonium citrate>ferrous lactate>ferrous sulfate>ferric citrate. Oxygen consumption of ferric ammonium citrate and ferric citrate was lower than ferrous lactate and ferrous sulfate. This trend was same in HTST and LTLT method, but generally oxygen consumption was lower in iron fortified market milk sterilized by LTLT method than by HTST. In total color change, ferrous lactate treatment was closer to control than other treatments. Also sensory characteristics of ferrous lactate treatment was showed better quality than other treatment. From these results, LTLT method was more suitable than HTST method for iron fortified market milk and ferrous lactate was comparably suitable among iron salts used in this study.

목차 (Table of Contents)

• Abstract
  
• 서론
  
• 재료 및 방법
  
• 결과 및 고찰
  
• 요약
  
• 문헌