Journal of the East Asian Society of Dietary Life (동아시아식생활학회지)

The East Asian Society of Dietary Life (동아시아식생활학회)
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Study on Anti-oxidative Activities and Beverage Preferences Relating to Fermented Lotus Root and Platycodon grandiflorum Extracts with Sugar through Lactic Acid Fermentation

젖산발효한 연근, 도라지 당추출 발효액의 항산화 활성과 음료기호성에 관한 연구

  • Lee, Kyung-Soo (School of Tourism & Food Service, Division of Food, Beverage & Culinary Arts, Yeungnam University College) ;
  • Kim, Ju-Nam (School of Tourism & Food Service, Division of Food, Beverage & Culinary Arts, Yeungnam University College) ;
  • Chung, Hyun-Chae (School of Tourism & Food Service, Division of Food, Beverage & Culinary Arts, Yeungnam University College)
  • 이경수 (영남이공대학교 관광외식학부 식음료조리계열) ;
  • 김주남 (영남이공대학교 관광외식학부 식음료조리계열) ;
  • 정현채 (영남이공대학교 관광외식학부 식음료조리계열)
  • Received : 2015.01.26
  • Accepted : 2015.02.28
  • Published : 2015.02.27
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Abstract

This study aimed to produce fermented extracts with sugar made from lotus root (LR) and Platycodon grandiflorum (PG), using lactic acid fermentation, and confirmed their physiological and anti-oxidative activities as basic data for manufacturing functional drinks through sensory tests. For the final sugar concentrations, PG showed $48.1^{\circ}brix$ and LR showed $52.0^{\circ}brix$. Sugar concentrations during lactic acid fermentation following dilution of sugar to $12^{\circ}brix$, ranged from $11.5{\sim}12.1^{\circ}brix$ for PG and $11.9{\sim}12.4^{\circ}C$ for LR. During lactic acid fermentation, lactic acid bacteria numbers tended to decrease in both fermented LR and PG extracts with sugar as the fermentation period increased. For DPPH radical scavenging ability, LR was three times higher in control without lactic acid fermentation while PG showed significant increases in L. acidophilus (77%), L. brevis (90%), and L. delbrueckii (177%) during lactic acid fermentation. For total polyphenol content, LR showed a higher concentration than PG, and except for fermented L. delbrueckii extract showing similarity with the control, contents of fermented extracts decreased. In the case of PG, CUPRAC, increased significantly in L. brevis, whereas FRAP, increased significantly in L. delbrueckii with lactic acid fermentation. For reducing power, except for fermentation with L. brevis, all PG showed lower reducing power activities. In the sensory test of fermented LR and PG extracts with sugar, both fermented extracts showed better results with L. brevis or L. delbrueckii than control or those with L. acidophilus in every item. Based on these results, it is highly possible to develop fermented extract drinks with sugar using LR or PG. In particular, lactic acid bacteria such as L. delbrueckii and L. brevis showed generally higher activities with potential as a functional drink.

본 연구는 가정에서 즐겨 먹는 대표적인 근채류인 연근과 도라지의 당추출 발효액을 제조하고, 이를 젖산발효시켜 발효액을 제조한 후 생리활성과 항산화 활성을 확인하고, 관능 검사를 통해 기능성 음료 제조 가능성을 대한 기초 자료로 조사하고자 하였다. 최종 당 농도는 도라지가 $48.1^{\circ}brix$, 연근이 $52.0^{\circ}brix$로 나타났다. 당추출 발효액을 $12^{\circ}brix$로 희석한 후 젖산발효하는 동안 변화하는 당 농도는 도라지가 $11.5{\sim}12.1^{\circ}brix$, 연근이 $11.9{\sim}12.4^{\circ}brix$ 범위로 나타났다. 젖산 발효기간 동안 초기 젖산균은 $10^{9{\sim}10}CFU/mL$ 수준이었으나, 연근 및 도라지 젖산발효액 둘 다 발효기간이 늘어날수록 감소하는 경향이었다. DPPH radical scavenging ability을 조사한 결과, 젖산발효하지 않은 control인 경우 연근이 도라지보다 3배 이상 우수한 것으로 나타났고, 젖산발효시 도라지인 경우 control보다 각각 L. acidophilus(77%), L. brevis(90%), L. delbrueckii(177%) 정도 유의적으로 증가한 것으로 나타났다. 총 폴리페놀함량 역시 연근이 도라지보다 함량이 많았으며, control과 비슷하게 나타난 L. delbrueckii 발효액을 제외하고는 젖산발효시 감소하는 것으로 나타났다. 도라지인 경우 CUPRAC 측정시 L. brevis에서, FRAP 측정시는 L. delbrueckii로 젖산발효시 유의적으로 증가하는 것으로 나타났다. 환원력은 도라지에서 L. brevis로 젖산발효한 경우를 제외하고 모두 감소하는 것으로 나타났다. 연근과 도라지 젖산발효액의 관능검사 결과, 두 발효액 모두 control이나 L. acidophilus 보다 L. brevis, L. delbrueckii로 젖산발효한 액의 관능검사 결과가 모든 면에서 좋게 나타났다. 이상의 관능검사 결과, 연근이나 도라지를 이용한 당추출 젖산발효 음료로써의 개발 가능성이 높을 것으로 판단되었으며, 특히 L. delbrueckii와 L. brevis 같은 일부 젖산균은 전반적으로 활성이 좋게 나타나, 기능성 젖산발효 음료로 제조하는데 우수할 것으로 판단되었다.

Keywords

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