Reacción #828723

Ecuación de reacción

carborundum

1-naphthaleneacetic acid

kinetin

sucrose

→

nicotine

Rendimiento 2.8%

Condiciones de reacción

Tratamiento posterior

1. 1
   workup.ADDITIONcontaining 1 mg
2. 2
   Otroon a rotary shaker (120 rpm, 25° C.)
3. 3
   OtroThe volume of growth medium per flask was
4. 4
   workup.ADDITIONwithout addition to the medium of modified protein in the form of oxidized BSA (20 μg./ml.)
5. 5
   workup.WAITAfter 4 weeks
6. 6
   Temperaturaweighted, frozen
7. 7
   ExtracciónThe dried cells were extracted with methanol in a Soxhlet extractor
8. 8
   Otrothe extract was evaporated to dryness at 40° C. with a Buchi Rotoevaporator
9. 9
   workup.DISSOLUTIONThe residue was dissolved in 0.5N HCl
10. 10
    Extracciónextracted with ether
11. 11
    Extracciónextracted twice with ether
12. 12
    Secadowere dried with K2CO3
13. 13
    workup.ADDITIONto adding HCl
14. 14
    Otroevaporating to dryness
15. 15
    workup.DISSOLUTIONThe residue was dissolved in 0.5N HCl
16. 16
    Secadodried in a stream of N2, and alkaloids

Procedimiento

Nicotiana tabacum cv. Xanthi (tobacco) leaf cells (about 300-400 mg. fresh weight per flask) were grown in the dark in suspension in a growth medium, as described by Murashige and Skook (Physiol. Plantarum 1962 15: 473), containing 1 mg./l. 1-naphthaleneacetic acid, 0.1 mg./l. kinetin and 3% sucrose in 125 ml. Erlenmeyer flasks on a rotary shaker (120 rpm, 25° C.). The volume of growth medium per flask was 30 ml., which contained about 10-20 mg. fine mesh carborundum. Comparative runs were carried out with and without addition to the medium of modified protein in the form of oxidized BSA (20 μg./ml.). After 4 weeks, the cells were harvested, weighted, frozen and lyophilized. The dried cells were extracted with methanol in a Soxhlet extractor and the extract was evaporated to dryness at 40° C. with a Buchi Rotoevaporator. The residue was dissolved in 0.5N HCl and extracted with ether. The aqueous layer was brought to pH 9.5 with NaOH, extracted twice with ether and the combined two ether extracts were dried with K2CO3, prior to adding HCl and then evaporating to dryness. The residue was dissolved in 0.5N HCl and aliquots were applied to TLC plates of silica gel G (Merck). The plates were developed in 85:14:1 chloroform-ethanol-ammonia, dried in a stream of N2, and alkaloids were visualized by Dragendorff's reagent. Quantitatively the alkaloids were determined by GLC analysis. In absence of elicitor there were obtained 2.8×10-3 % (dry weight) nicotine, compared with 2.2% (dry weight) in presence of elicitor, the latter representing a 7.8×103 fold enhancement of yield. The dry weight of cells at the end of the run was 3.2 g. per flask.

Fuente