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Liquid Culture Systems for in vitro Plant Propagation

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528 Dirk Wilken et al.<br />

runn<strong>in</strong>g at 60 rpm. The culture temperature was 26 °C. Both bioreactors<br />

were <strong>in</strong>oculated with 20 g l -1 cell fresh weight and harvested after 19 days.<br />

2.3 Temporary immersion system (TIS)<br />

A temporary immersion system was constructed us<strong>in</strong>g 5-litre glass tw<strong>in</strong><br />

vessels. Under standard conditions the system was run with 2 litres of<br />

medium that was changed every 2 or 3 weeks. The TIS vessels were<br />

<strong>in</strong>oculated with 30 g of <strong>in</strong> <strong>vitro</strong>-grown shoots. Shoots were immersed every<br />

4 h <strong>for</strong> 5 m<strong>in</strong>. The temperature and the light <strong>in</strong>tensity were as given above.<br />

The cultures were harvested after 8 weeks.<br />

2.4 Field grown plants<br />

Fabiana imbricata was collected <strong>in</strong> the Western Andean slopes near<br />

Altos de Chillan, Las Trancas, Chile. Lavandula offic<strong>in</strong>alis and Hypericum<br />

per<strong>for</strong>atum plants were obta<strong>in</strong>ed from the Botanical Garden of the<br />

University of Leipzig. For analysis of the leaf oil composition of Lavandula<br />

offic<strong>in</strong>alis commercially dealed material orig<strong>in</strong>ated from Corsica.<br />

Cymbopogon citratus was collected <strong>in</strong> Bayamo, Cuba.<br />

2.5 Analysis of secondary plant metabolites<br />

Contents of bioactive compounds were determ<strong>in</strong>ed <strong>in</strong> powdered tissue<br />

samples that were oven-dried at 40 °C. The metabolites of <strong>in</strong>terest were:<br />

rosmar<strong>in</strong>ic acid and essential oil <strong>in</strong> Lavandula, hyperic<strong>in</strong> <strong>in</strong> Hypericum, �and<br />

�-citral <strong>in</strong> Cymbopogon and oleanolic acid <strong>in</strong> Fabiana.<br />

2.5.1 Sample preparation and determ<strong>in</strong>ation of rosmar<strong>in</strong>ic acid<br />

Accord<strong>in</strong>g De-Eknamkul (1984), Gracza und Ruff (1984) and Lopez et<br />

al. (1994) a method <strong>for</strong> determ<strong>in</strong>ation of the content of rosmar<strong>in</strong>ic acid <strong>in</strong><br />

cultures of Lavandula was established. Samples of 20 mg of dried and<br />

powdered plant material were extracted two times with 3 ml methanol <strong>in</strong> an<br />

ultrasonic bath at room temperature <strong>for</strong> 10 m<strong>in</strong>utes. The filtrates were<br />

collected, filtrated and analysed by HPLC. A Gynkotek HPLC system<br />

(Dionex) equipped with a diode array detector (UVD 340S) and a LiChrocart<br />

RP18 Supersphere Colomn (250mm x 4 mm; 4 µm) was used. A mixture of<br />

methanol/water/phosphoric acid (50/59.7/0.3; v/v) was used as eluant at a<br />

flow rate of 0.5 ml m<strong>in</strong> -1 . All measurements were carried out at 30°C under<br />

isocratic conditions. Rosmar<strong>in</strong>ic acid was detected at 333 nm and showed a

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