• Journal of the Korean Wood Science and Technology
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• 제33권2호통권130호
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• pp.72-77
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• 2005

Streptococcus mutans is known as a strong cariogenic bacterium and produces dental caries. This study was carried out to develop anticariogenic agents from Callistemon citrinus. Crude extracts and thier various solvent fractions of the plant extracts were tested for the antibacterial activity against S. mutans. The anticariogenic activity was evaluated with by paper disc diffusion method and minimal inhibition concentration (MIC). The extract from the fruit and its hexane fraction showed a strong inhibitory effect on the growth of S. mutans and the MICs were 31.2 and $3.9{\mu}g/m{\ell}$, respectively.

• 한국자원식물학회지
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• 제21권6호
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• pp.431-434
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• 2008

Dental caries is the destruction of the enamel of teeth by Streptoccus mutans. S. mutans has been isolated from human dental plaque and is associated with the initial development of enamel lesions. We have studied the antibacterial action of the fruit of Callistemon citrin us against a cariogenic bacterium, S. mutans. From the fruit of C. citrinus, piceatannol (3,3',4',5-tetrahydroxystilbene) was isolated by repeated column chromatography with $SiO_2$ and Sephadex LH-20. Its structure was elucidated by instrumental analysis using 1D-NMR, 2D-NMR and EI-MS. This compound was isolated from the fruit of C. citrin us for the first time. The anticarcinogenic activity of this compound was determined by using agar well-diffusion method and minimal inhibition concentration (MIC).

• 한국자원식물학회지
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• 제15권2호
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• pp.107-113
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• 2002

본 연구는 외래도입 병솔꽃나무(Callistemon citrinus)의 개화결실 습성과 효율적인 증식방법을 구명 하고자 수행하였다. 병솔꽃나무의 삭과는 개화후 4년간 가지에 존속하며, 종자의 수와 크기는 3년생 삭과와 2년생 삭과가 비슷한 반면 1년생 삭과는 크게 차이가 나는 것으로 나타났다. 삭과로부터 종자를 탈리시키기 위해 건조시킨 결과 삭과의 상대 수분함량이 약 75%일 때 삭과열개율이 100%에 달했다. 발아율은 3$0^{\circ}C$에서 건조시킨 종자가 가장 높았으며, 그 중 2년생 삭과에서 탈리된 종자의 발아율이 높았다. 반면 50, 7$0^{\circ}C$에서 건조되어 탈리된 종자의 발아율은 낮았다. 가을철 2차 개화를 유도하기 위하여 봄철 개화 후 삭과가 달린 가지를 전정한 개체에서는 모든 개체에서 가을에 개화하였으며 , 개화량은 평균 14송이였다. 반숙지를 IBA 100mgι$^{-1}$ 에 24시간 침적처리한 결과 86.4%가 발근되었으며, 평균 12.6개의 1차근을 가지며 생장이 가장 양호하였다.

• Food Science and Biotechnology
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• 제14권2호
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• pp.212-215
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• 2005

Ethanol crude extracts of wood, bark, leaf, and fruit of Callistenwn citrinus were compared for their antioxidant activities based on DPPH (1, 1-diphenyl-2-picrylhydrazyl) radical-scavenging activity and reducing power. Bark extract showed the most potent radical-scavenging activity and reducing power, showing 94.1 and 0.64% at 25 and $100\;{\mu}g/mL$, respectively. Total phenolic content of the bark extracts (275.0 mg GAE/g) was higher than those of others. Further fractionation of the bark extract using hexane, $CH_2Cl_2$, and EtOAc showed EtOAc fraction had the highest antioxidant activity ($IC_{50}\;6.7\;{\mu}g/mL$) and reducing power (0.82 at $100\;{\mu}g/mL$), with total phenolic content of 611.1 mg GAE/g. Total phenolic contents correlated with antioxidant activity ($R^2\;=\;0.7061$) and reducing power ($R^2\;=\;0.7399$).