648 research outputs found
Identification of cubebin and epicubebin isolated from Piper cubeba L.f fruits with two D-NMR spectroscopy
One of the isolated active compound of the tracheospasmolytic from kemukus fruits (Piper cubeba L.f) is cubebin. The problem occurred when cubebin (C20H20O6) mixed with its epimer because of the difficultly to identify the structure by 1D-NMR spectroscopy. Structure identification then was conducted by 2D-NMR spectroscopy, so the structure of cubebin and epicubebin can be clear identified.
Key words : Cubebin, epicubebin, identification, 2D-NM
Leveraging 3D printing to enhance mass spectrometry:A review
The use of 3D printing in the chemical and analytical sciences has gained a lot of momentum in recent years. Some of the earliest publications detailed 3D-printed interfaces for mass spectrometry, which is an evolving family of powerful detection techniques. Since then, the application of 3D printing for enhancing mass spectrometry has significantly diversified, with important reasons for its application including flexible integration of different parts or devices, fast customization of setups, additional functionality, portability, cost-effectiveness, and user-friendliness. Moreover, computer-aided design (CAD) and 3D printing enables the rapid and wide distribution of scientific and engineering knowledge. 3D printers allow fast prototyping with constantly increasing resolution in a broad range of materials using different fabrication principles. Moreover, 3D printing has proven its value in the development of novel technologies for multiple analytical applications such as online and offline sample preparation, ionization, ion transport, and developing interfaces for the mass spectrometer. Additionally, 3D-printed devices are often used for the protection of more fragile elements of a sample preparation system in a customized fashion, and allow the embedding of external components into an integrated system for mass spectrometric analysis. This review comprehensively addresses these developments, since their introduction in 2013. Moreover, the challenges and choices with respect to the selection of the most appropriate printing process in combination with an appropriate material for a mass spectrometric application are addressed; special attention is paid to chemical compatibility, ease of production, and cost. In this review, we critically discuss these developments and assess their impact on mass spectrometry
Honey in traditional Chinese medicine: A guide to future applications of NADES to medicines
Plant science
Alkaloid production by a Cinchona officinalis "Ledgeriana" hairy root culture containing constitutive expression constructs of tryptophan decarboxylase and strictosidine synthase cDNAs from Catharanthus roseus
Cinchona officinalis ‘Ledgeriana’, former
called Cinchona ledgeriana, hairy roots were initiated
containing constitutive-expression constructs of cDNAs
encoding the enzymes tryptophan decarboxylase
(TDC) and strictosidine synthase (STR) from Catharanthus roseus, two key enzymes in terpenoid indole
and quinoline alkaloid biosynthesis. The successful
integration of these genes and the reporter gene gus-int
was demonstrated using Southern blotting and the
polymerase chain reaction. The products of TDC and
STR, tryptamine and strictosidine, were found in high
amounts, 1200 and 1950 mg g–1 dry weight, respectively.
Quinine and quinidine levels were found to rise up to
500 and 1000 mg g–1 dry weight, respectively. The
results show that genetic engineering with multiple
genes is well possible in hairy roots of C. officinalis.
However, 1 year after analyzing the hairy roots for the
first time, they had completely lost their capacity to
accumulate alkaloids.info:eu-repo/semantics/publishedVersio
Suspension cultured transgenic cells of Nicotiana tabacum expressing tryptophan decarboxylase and strictosidine synthase cDNAs from Catharanthus roseus produce strictosidine upon secologanin feeding
A transgenic cell suspension culture of Nicotiana tabacum L. ‘Petit Havana’ SR1 was established expressing tryptophan decarboxylase and strictosidine synthase cDNA clones from Catharanthus roseus (L.) G. Don
under the direction of cauliflower mosaic virus 35S promoter and nopaline synthase terminator sequences. During a growth cycle, the transgenic tobacco cells showed
relatively constant tryptophan decarboxylase activity and
an about two- to sixfold higher strictosidine synthase activity, enzyme activities not detectable in untransformed
tobacco cells. The transgenic culture accumulated tryptamine and produced strictosidine upon feeding of secologanin, demonstrating the in vivo functionality of the two
transgene-encoded enzymes. The accumulation of strictosidine, which occurred predominantly in the medium, could
be enhanced by feeding both secologanin and tryptamine.
No strictosidine synthase activity was detected in the medium, indicating the involvement of secologanin uptake
and strictosidine release by the cells.info:eu-repo/semantics/publishedVersio
Alkaloid production by a Cinchona officinalis "Ledgeriana" hairy root culture containing constitutive expression constructs of tryptophan decarboxylase and strictosidine synthase cDNAs from Catharanthus roseus
Cinchona officinalis ‘Ledgeriana’, former
called Cinchona ledgeriana, hairy roots were initiated
containing constitutive-expression constructs of cDNAs
encoding the enzymes tryptophan decarboxylase
(TDC) and strictosidine synthase (STR) from Catharanthus roseus, two key enzymes in terpenoid indole
and quinoline alkaloid biosynthesis. The successful
integration of these genes and the reporter gene gus-int
was demonstrated using Southern blotting and the
polymerase chain reaction. The products of TDC and
STR, tryptamine and strictosidine, were found in high
amounts, 1200 and 1950 mg g–1 dry weight, respectively.
Quinine and quinidine levels were found to rise up to
500 and 1000 mg g–1 dry weight, respectively. The
results show that genetic engineering with multiple
genes is well possible in hairy roots of C. officinalis.
However, 1 year after analyzing the hairy roots for the
first time, they had completely lost their capacity to
accumulate alkaloids.info:eu-repo/semantics/publishedVersio
Suspension cultured transgenic cells of Nicotiana tabacum expressing tryptophan decarboxylase and strictosidine synthase cDNAs from Catharanthus roseus produce strictosidine upon secologanin feeding
A transgenic cell suspension culture of Nicotiana tabacum L. ‘Petit Havana’ SR1 was established expressing tryptophan decarboxylase and strictosidine synthase cDNA clones from Catharanthus roseus (L.) G. Don
under the direction of cauliflower mosaic virus 35S promoter and nopaline synthase terminator sequences. During a growth cycle, the transgenic tobacco cells showed
relatively constant tryptophan decarboxylase activity and
an about two- to sixfold higher strictosidine synthase activity, enzyme activities not detectable in untransformed
tobacco cells. The transgenic culture accumulated tryptamine and produced strictosidine upon feeding of secologanin, demonstrating the in vivo functionality of the two
transgene-encoded enzymes. The accumulation of strictosidine, which occurred predominantly in the medium, could
be enhanced by feeding both secologanin and tryptamine.
No strictosidine synthase activity was detected in the medium, indicating the involvement of secologanin uptake
and strictosidine release by the cells.info:eu-repo/semantics/publishedVersio
Preface: natural deep eutectic solvents: A third liquid phase in living organisms? Discovery, theory, biology and applications
Plant science
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