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논문 상세정보

천연식물추출물을 첨가한 저염 오징어젓갈의 품질특성, 유통기한 및 생리활성

Quality Characteristics, Shelf-life, and Bioactivities of the Low Salt Squid Jeot-gal with Natural Plant Extracts

초록

본 연구는 염농도의 저하에 따른 저염 오징어젓갈의 유통기한 감소에 대하여 유통기한의 연장과 기능성 제품화의 가능성을 검토하기 위하여 천연식물추출물 첨가에 따른 저장기간별 품질특성, 최적발효기한, 유통기한 설정 및 생리활성을 연구하였으며, 그 결과는 다음과 같다. 첨가군 모두 저장온도가 증가할수록 pH는 급격히 감소하였고, 아미노질소, 휘발성염기질소의 함량은 급격히 증가하였으며, 총균수 역시 증가하였다. 유통기한 및 최적발효기한은 Arrhenius equation의 결과에 따라 $10^{\circ}C$에서 대조구 34 및 28일, 월계수첨가 35 및 29일, 녹차첨가 34 및 30일, 솔잎첨가 34 및 29일 저장한 것이었다. 구성 및 유리아미노산은 첨가군 모두가 glutamic acid, glycine, alanine 등의 감칠맛, 단맛을 내는 아미노산의 함량이 대부분을 차지하여 맛에서 우수하다고 판단되었고, 핵산관련물질은 첨가군 모두 쓴맛을 나타내는 hypoxanthine이 대부분을 차지하였으며, 그 뒤 inosine 및 정미성분인 IMP 순이었다. 관능검사결과 월계수첨가군이 종합적으로 가장 뛰어났다. 생리활성은 첨가군이 대조구에 비해 활성이 높았으며, 기능성 제품으로서의 상업화가 가능하다고 판단된다. 그러므로 천연식물추출물을 첨가한 저염 오징어젓갈은 웰빙 등 시대의 변화에 맞추어 현대인의 식기호에 적합한 식품으로 이용 가능하며, 젓갈의 고급화 및 부가가치 창출이 가능하다고 사료된다.

Abstract

To improve the quality and functionality of the low salt squid Jeot-gal, extracts from three types of medicinal and edible plants (bay leaf, green tea, pine needle) were added. The quality characteristics, bioactivities, and shelf-lives of these preparations were determined at three different fermentation temperatures. The pH decreased more rapidly at higher temperatures, while the amount of volatile basic nitrogen (VBN), total viable cells, and amino nitrogen ($NH_2$-N) increased. The shelf-lives of Jeot-gal with natural plant extracts at $10^{\circ}C$ were 34~35 days, similar to the control. The major free and compositional amino acids of Jeot-gal were glutamic acid, proline, and alanine, while the major nucleotides (and related compounds) were hypoxanthine and inosine. In bioactivity assays, samples supplemented with plant extracts showed higher bioactivities than the control. The DPPH radical scavenging activity of ethanol extracts from Jeot-gal were stronger than the water extracts; in contrast, the water extracts were stronger for hydrogen peroxide scavenging activity. However, superoxide dismutase (SOD)-like activity and ${\beta}$-glucuronidase inhibitory activity were moderately low at 20 mg/mL. Based on sensory evaluation results, the quality of low salt squid Jeot-gal with natural plant extracts is similar to the control. Therefore, low salt squid Jeot-gal with natural plant extracts can be commercialized as a functional fermented food.

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