Geschmack ist vorhersagbar: Mit FlavorMiner. FlavorMiner heißt das Tool, das IPB-Chemiker und Partner aus Kolumbien jüngst entwickelt haben. Das Programm kann, basierend auf maschinellem Lernen (KI), anhand der…
Seit Februar 2021 bietet Wolfgang Brandt, ehemaliger Leiter der Arbeitsgruppe Computerchemie am IPB, sein Citizen Science-Projekt zur Pilzbestimmung an. Dafür hat er in regelmäßigen Abständen öffentliche Vorträge zur Vielfalt…
Ravindran, B. M.; Rizzo, P.; Franke, K.; Fuchs, J.; D’Auria, J.;Simple and robust multiple shoot regeneration and root induction cycle from different explants of Hypericum perforatum L. genotypesPlant Cell Tiss. Organ Cult.1521-15(2023)DOI: 10.1007/s11240-022-02370-w
Hypericum perforatum L. commonly known as Saint John’s Wort (SJW) is an economically important medicinal plant known for accumulating its valuable bioactive compounds in a compartmentalized fashion. The dark glands are very rich in hypericin, and translucent glands are filled with hyperforin. The antibiotic properties of the afore mentioned bioactive compounds make it hard to establish tissue regeneration protocols essential to put in place a transformation platform that is required for testing gene function in this challenging species. In this study, we report the establishment of a regeneration and root induction cycle from different types of explants. The regeneration cycle was set up for the continuous supply of roots and leaf explants for downstream transformation experiments. The most effective medium to obtain multiple shoot-buds from node cultures was MS (Murashige and Skoog, Physiol Plant 15:473–497, 1962) medium supplemented with 0.5 mg L−1 6-Benzylaminopurine (BAP) and 0.5 mg L−1 indole-3-butyric acid (IBA). The same combination yielded copious amounts of shoots from root and leaf explants as well. For rooting the elongated shoots, MS medium devoid of plant growth regulators (PGRs) was sufficient. Nevertheless, addition of a low amount of IBA improved the quantity and quality of roots induced. Additionally, the roots obtained on a medium containing IBA readily developed shoot buds.
Publikation
Ravindran, B. M.; Rizzo, P.; Franke, K.; Fuchs, J.; D’Auria, J.;Correction to: Simple and robust multiple shoot regeneration and root induction cycle from different explants of Hypericum perforatum L. genotypesPlant Cell Tiss. Organ Cult.15217(2023)DOI: 10.1007/s11240-022-02382-6
Ravindran, B. M.; Rizzo, P.; Franke, K.; Fuchs, J.; D’Auria, J.;Correction to: Simple and robust multiple shoot regeneration and root induction cycle from different explants of Hypericum perforatum L. genotypesPlant Cell Tiss. Organ Cult.15219(2023)DOI: 10.1007/s11240-022-02418-x
Moura, P. H. B.; Porzel, A.; Nunes, R. M.; Baratto, L. C.; Wessjohann, L. A.; Martins, R. C. C.; Leal, I. C. R.;Antioxidant capacity and fragmentation features of
C‐glycoside isoflavones by high‐resolution electrospray ionization tandem mass spectrometry using collision‐induced and high‐energy collisional dissociation techniquesJ. Mass Spectrom.56e4793(2021)DOI: 10.1002/jms.4793
The rapid annotation and identification by mass spectrometry techniques
of flavonoids remains a challenge, due to their structural diversity and
the limited availability of reference standards. This study applies a
workflow to characterize two isoflavonoids, the orobol-C-glycosides
analogs, using high-energy collisional dissociation (HCD)- and
collision-induced dissociation (CID)-type fragmentation patterns, and
also to evaluate the antioxidant effects of these compounds by ferric
reducing antioxidant power (FRAP), 2,2′-azino-bis(3-ethylbenzothiazolin
acid) 6-sulfonic acid (ABTS), and 2,2-diphenyl-1-picrylhydrazyl (DPPH)
methods. By the CID-type fragmentation, in positive mode and at all
high-resolution mass spectrometry (HRMS) multiple stage, there were
shown differences in the annotation of the compounds, mainly concerning
some ratios of relative abundance. At CID-MS2 20 eV, the compounds could be efficiently characterized, because they present distinct base peaks [M + H]+ and [M + H–H2O]+ for the orobol-8-C- and orobol-6-C-glycoside, respectively. Similarly, by the HCD-type fragmentation, in HRMS2 stage, differences between orobol analogs in both mode of ionization were observed. However, the HR HCD-MS2 at 80 eV, in positive mode, generated more ions and each isomer presented different base peaks ions, [0,2X]+ for the orobol-8-C-glycoside and [0,3X]+ for the orobol-6-C-glycoside. By the DPPH, the 8-C-derivative
showed a very close value compared with the standard rutin and, in the
ABTS method, a higher radical-scavenging activity. In both methods, the
EC50 of orobol-8-C-glycoside was almost twice better compared with orobol-6-C-glycoside. In FRAP, both C-glycosides showed a good capacity as Fe+3
reducing agents. We could realize that combined MS techniques,
highlighting the positive mode of ionization, can be used to evaluate
the isoflavones analogs being useful to differentiate between the
isomeric flavones; therefore, these data are important to mass
spectrometry dereplication studies become more efficient.