Journal of Sericultural and Entomological Science (한국잠사곤충학회지)

Korean Society of Sericultural Science (한국잠사학회)
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Functional quality characteristics of extracts by sugar-leaching and lactic acid fermentation of mulberry leaves (Morus alba L.)

뽕잎의 당침 및 유산발효에 의한 추출물의 기능성 품질 특성

  • Ryu, Il-Hwan (College of Life Science and Natural Resources, Wonkwang University) ;
  • Kwon, Tae-Oh (College of Life Science and Natural Resources, Wonkwang University)
  • 류일환 (원광대학교 생명자원과학대학) ;
  • 권태오 (원광대학교 생명자원과학대학)
  • Received : 2013.09.17
  • Accepted : 2013.10.25
  • Published : 2013.11.30
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Abstract

This study was carried out to investigate functional quality characteristics of extract obtained after sugar-leaching for 12 weeks (SLE) and extract obtained after lactic acid fermentation for 8 weeks (LFE) of mulberry leaves. The yield, sugar content, pH, and total acidity of SLE were 27%, 43 $^{\circ}Brix$, 4.6, and 0.45%. The yield, sugar content, pH, and total acidity of LFE were 166%, 33 $^{\circ}Brix$, 3.6, and 1.17% respectively. The lactic acid bacteria viable numbers ($1.2{\times}10^{10}$ CFU/ml) of LFE were more than those of SLE ($2.8{\times}10^2$ CFU/ml). The LFE expressed activities of hydrolytic enzymes (amylase, cellulase, pectinase, protease), but SLE did not express. The contents of acetic acid, citric acid, and malic acid of SLE were higher than those of LFE, but lactic acid content of LFE was higher than that of SLE. The main free sugars of SLE were glucose (200.93 mg/g), fructose (236.32 mg/g), and sucrose (18.41 mg/g), but LFE did not detect all free sugars. The contents of polyphenol, anthocyanin, and piperidine alkaloid of LFE were higher than those of SLE. ${\alpha}$-Glycosidase activities were inhibited 3.4% and 16.2% by SLE and LFE. These results suggest that lactic acid fermentation extraction is an effective method to increase the yield and contents of functional quality of mulberry leaves extract.

이 연구는 뽕잎을 전통방식의 당침 추출액과 Lactobacillus plantarum TO- 2100 유산균을 이용한 유산발효 추출액의 기능성 품질 특성을 조사하였다. 당침 추출액은 12주 동안 추출하였으며, 유산발효 추출액은 8주간 추출하였다. 당침 추출액 및 유산발효 추출액의 수율은 각각 27% 와 166% 였으며, 당 함량은 각각 43 $^{\circ}Brix$와 33 $^{\circ}Brix$였다. pH와 총 산도는 4.6, 0.45% 와 3.6, 1.17%였다. 유산발효 추출액의 유산균 생균수는 $1.2{\times}10^{10}$ $CFU/m{\ell}$으로 당침 추출액의 $2.8{\times}10^2$ $CFU/m{\ell}$ 보다 월등히 많았다. 유산발효 추출액이 amylase, cellulase, pectinase, protease 등 분해효소의 활성을 보인 반면, 당침 추출액은 분해효소의 활성을 나타내지 않았다. 유기산의 경우 malic acid, acetic acid, citric acid의 함량은 당침 추출액이 높은 반면, lactic acid 의 함량은 유산발효 추출액이 2.6배 높았다. 당침 추출액의 유리당은 glucose (200.93mg/g), fructose (236.32mg/g), sucrose (18.41mg/g) 등 GI값이 높은 단당으로 구성된 반면, 유산발효 추출액에서는 유리당이 검출되지 않았다. 기능성 성분인 polyphenol, anthocyanin 및 당질대사 저해물질인 piperidine alkaloid의 함량 또한 유산발효 추출액이 당침 추출액보다 높았다. 당질대사의 주 효소인 ${\alpha}$-glycosidase의 활성을 당침 추출액이 3.4% 저해한 반면 유산발효 추출액은 16.2% 저해 활성을 보였다. 이 결과로부터 전통방식의 당침 추출법에 비해 유산발효 추출법이 뽕잎의 수율 향상 및 기능성 성분의 함량 증진에 더 효과적이며, 이로 인한 대사기능장애의 예방 및 기능증진에 더 유효할 것으로 사료된다.

Keywords

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