Quality of Extracts from Domestic Stevia(stevia rebaudiana BERTONI) Leaves with Harvest Time

수확시기별 국내산 Stevia 추출물의 품질특성

  • Published : 2004.12.01

Abstract

Consumers were tend to purchase more natural sweeting materials then atificial sweeting materials because of safety and the consumed amount of natural sweeting material was increased sharply with consumers concern to health. The proper harvest time with changes of sweeting material contents was investigated in the purpose of cultivation and utilization on functional foodstuff, Soluble solid content and extraction yield were increased with growth priod, but pH was decreased. Color value, transmittance and browning color showed little. L, a, b values was changed a little. Stevioside ratio($68.97\%$) in sweetness components was decreased to $61.09\%$. Rebaudioside A ratio was increased from $20.83\%\;to\;27.52\%$ stevioside contents was maximized to $12.80\%$ of August. The highest sweetening potencies of stevia leaves was 2530times to sugar. The stevia leaves harvested at May showed the best deliciousness.

천연 저 칼로리 감미료로써 stevia의 소비가 증가하고 있는 시점에서 재배 및 기능성 식품소재로 이용하기 위하여 수확시기별 특성을 조사한 결과는 다음과 같다. 가용성 고형분 함량과 추출수율은 성장 기간이 길어질수록 증가하였고, pH는 감소하는 경향을 보였다. 색도와 투과율은 큰 변화가 없었으나, 성장 시기가 길어질수록 L, a, b값은 유사한 감소 경향을 나타내었고, 갈색도는 증가하였다. 성장기간 중 stevioside와 rebaudioside A의 비율은 stevioside는 $68.97\%$에서 $61.09\%$까지 감소하고, rebaudioside A는 $20.83\%$에서 $27.52\%$까지 증가하였다. Stevia 잎의 감미성분함량은 성장함에 따라 일정한 수준으로 증가하여 최고치는 8월말이며 함량은 $12.80\%$였고, 9월말에는 함량이 $12.10\%$로 감소하는 경향을 보였다. 최고 감미도는 25 - 30배였으며 감미질은 5월말에 채취한 시료가 가장 우수하였다.

Keywords

References

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