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Antioxidant activity of the Sumaeyaksuk tea extracts prepared with different drying and extract conditions

건조 및 침출 조건에 따른 섬애약쑥 침출물의 항산화활성

  • Received : 2013.04.03
  • Accepted : 2013.08.13
  • Published : 2013.08.30

Abstract

In this study, we examined the antioxidant activity of the Sumaeyaksuk (Artemisia argyi) tea extracts from different pre-treatment and extraction methods. Sumaeyaksuk was sun-dried for 3.5 days (control, RC) and aged at a temperature of $60^{\circ}C$ for 3.5 days (HA), 7 days (HB), and 14 days (HC), respectively. Each sample was extracted in $60^{\circ}C$ and $95^{\circ}C$ hot water for 2 minutes. The soluble solids content of HA from the $60^{\circ}C$and $95^{\circ}C$ hot water extraction were $0.52{\pm}0.18%$ and $0.92{\pm}0.18%$, respectively. The soluble solids content was increased by the higher extraction temperature. The reducing sugar content of RC was $9.55{\pm}0.18mg/g$ in the $95^{\circ}C$ extraction, which was significantly higher than in the $60^{\circ}C$ extracted sample. However, the reducing sugar content did not show a remarkable difference based on aging periods. The total phenolic compound content of the $95^{\circ}C$ extracted samples was $3.36{\pm}0.13{\sim}9.88{\pm}0.23mg/g$, which was significantly higher than that of the $60^{\circ}C$ extracted sample. The ABTS radical scavenging activity of the $60^{\circ}C$ extracted RA and HA samples were 35.63% and 95.10%, respectively. Moreover, the radical scavenging activity increased to 63.35% and 96.78%, respectively, in the $95^{\circ}C$ extracted samples. As a result of the high temperature, the extracted sample showed an increase in the FRAP. In the RC sample, the FRAP was two times higher in the $95^{\circ}C$ extracted sample ($181.28{\pm}2.90{\mu}M$) than in the $60^{\circ}C$ extracted sample ($83.88{\pm}0.43{\mu}M$).

경남 남해군에서 자생하며 황해쑥의 변종으로 확인되어 품종 출원 추진 중인 섬액약쑥(A. argyi)을 차로 음용하기 위하여 숙성기간과 침출온도에 따른 침출물의 생리활성을 비교 하였다. 천일 건조한 쑥을 대조군(RC)으로 하고 $60^{\circ}C$의 항온기에서 3.5(HA), 7(HB) 및 14(HC) 일간 숙성하여 제조한 쑥을 차로 음용 할 때의 최저($60^{\circ}C$) 및 최고($95^{\circ}C$) 온도에서 각각 침출하였다. 가용성 고형분의 함량은 $60^{\circ}C$$95^{\circ}C$에서 침출한 HA 시료에서 각각 $0.52{\pm}0.18%$$0.92{\pm}0.18%$로 침출온도가 높을수록 가용성 고형분의 함량도 높아지는 경향이었다. 환원당 함량은 침출온도가 높을수록 더 높아 RC 시료의 경우 $95^{\circ}C$ 침출시 $9.55{\pm}0.18mg/g$으로 $60^{\circ}C$ 침출시에 비해 유의적으로 높은 함량이었다. 반면, 숙성기간에 따른 함량 차는 적어 $60^{\circ}C$에서 침출한 HA~HC 시료의 환원당은 $10.08{\pm}0.03{\sim}10.64{\pm}0.03mg/g$의 범위였다. 총 페놀화합물의 함량은 $60^{\circ}C$에서 침출하였을 때 $2.30{\pm}0.21{\sim}7.02{\pm}0.22mg/g$이었고, $95^{\circ}C$에서 침출하였을 때는 $3.36{\pm}0.13{\sim}9.88{\pm}0.23mg/g$으로 높은 온도에서 침출할 때 더 높았다. 전처리 기간이 동일한 RC와 HA 시료를 각각 $60^{\circ}C$에서 침출하였을 때 ABTS 라디칼 소거활성은 침출온도가 높을수록, 숙성 처리된 시료일수록 활성이 더 증가하였다. FRAP는 침출 온도가 높을 때 활성이 높아, RC 시료의 경우 $60^{\circ}C(83.88{\pm}0.43{\mu}M)$ 보다 $95^{\circ}C$에서 침출 하였을 때 $181.28{\pm}2.90{\mu}M$로 활성은 2배 이상 증가하였다. 이상의 결과를 종합하여 볼 때 섬애약쑥은 숙성 처리 후 높은 온도에서 침출하여 음용할 때 유용성분의 섭취가 더 용이하며, 항산화활성도 더 우수하였다.

Keywords

References

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