scholarly journals Cyclic Lipopeptides with Herbicidal and Insecticidal Activities Produced by Bacillus clausii DTM1

2015 ◽  
Vol 10 (12) ◽  
pp. 1934578X1501001 ◽  
Author(s):  
Da-Le Guo ◽  
Bo Wan ◽  
Shi-Ji Xiao ◽  
Sarah Allen ◽  
Yu-Cheng Gu ◽  
...  
Keyword(s):  
Methyl Ester ◽  
Natural Product ◽  
Fermentation Broth ◽  
Cyclic Lipopeptides ◽  
Bacillus Clausii ◽  
Cyclic Lipopeptide ◽  
Lipopeptide Biosurfactants ◽  
First Time ◽  
Insecticidal Activities

Seven cyclic lipopeptide biosurfactants (1–7) were isolated for the first time from the fermentation broth of endophytic Bacillus clausii DTM1 and were identified as anteisoC13[Val7] surfactin-(L-Glu)-O-methyl-ester (1), anteisoC12[Val7] surfactin (2), anteisoC15[Val7] surfactin (3), isoC14[Leu7] surfactin (4), anteisoC12[Leu7] surfactin (5), nC13[Leu7] surfactin (6), and anteisoC14[Leu7] surfactin-(L-Glu)-O-methyl-ester (7); 1 has not been isolated before as a natural product from any source. Plate-based herbicide and insecticide bioassays showed that all compounds exhibited interesting insecticidal and herbicidal activities.

Pigments of Fungi. XLVIII Clavorubin from Two Australasian Toadstools of the Genus Cortinarius and the X-Ray Crystal Structure of the Methyl Ester of 6-O-Methylclavorubin

1998 ◽  
Vol 51 (5) ◽  
pp. 347 ◽  
Author(s):  
Melvyn Gill ◽  
Malcolm S. Buchanan ◽  
Peter J. Steel ◽  
Nives M. Milanovic ◽  
Somphone Phonh-Axa
Keyword(s):  
Crystal Structure ◽  
Carboxylic Acid ◽  
Methyl Ester ◽  
Single Crystal ◽  
Natural Product ◽  
Structure Analysis ◽  
Claviceps Purpurea ◽  
Chemical Methods ◽  
X Ray ◽  
First Time

Clavorubin (1,5,6,8-tetrahydroxy-3-methyl-9,10-dioxoanthracene-2-carboxylic acid) (1), previously known only from the ascomycetious rye fungus Claviceps purpurea (‘ergot’), has been isolated from the fruit bodies of two Australasian basidiomycetes belonging to the genus Cortinarius and characterized by spectroscopic and chemical methods. A single-crystal X-ray structure analysis of the methyl ester (4) of 6-O-methylclavorubin establishes unequivocally, for the first time, the structure of the natural product.

Alkaloids of Tabernaemontana psychotrifolia H.B.K.

1971 ◽  
Vol 49 (2) ◽  
pp. 307-316 ◽  
Author(s):  
R. H. Burnell ◽  
J. D. Medina
Keyword(s):  
Natural Product ◽  
Degradation Products ◽  
Dihydro Derivative ◽  
First Time

A new alkaloid C20H24N2O (taberpsychine) obtained from Venezuelan T. psychotrifolia is shown to have structure 5. The Hofmann degradation products of taberpsychine and its dihydro derivative are discussed. Two other bases isolated are affinine and 16-epi-vobasinic acid, the latter for the first time as a natural product.

scholarly journals Molecular diversity of bacteria in commercially available “Spirulina” food supplements

PeerJ ◽  
2016 ◽  
Vol 4 ◽  
pp. e1610 ◽  
Author(s):  
Elisabeth Vardaka ◽  
Konstantinos A. Kormas ◽  
Matina Katsiapi ◽  
Savvas Genitsaris ◽  
Maria Moustaka-Gouni
Keyword(s):  
Natural Product ◽  
454 Pyrosequencing ◽  
Molecular Diversity ◽  
Arthrospira Platensis ◽  
Food Supplements ◽  
Health Issues ◽  
Operational Taxonomic Units ◽  
Health Promoting ◽  
First Time ◽  
Pyrosequencing Analysis

The cyanobacteriumArthrospirais among the most well-known food supplements worldwide known as “Spirulina.” While it is a widely recognized health-promoting natural product, there are no reports on the molecular diversity of commercially available brands of “Spirulina” supplements and the occurrence of other cyanobacterial and heterotrophic bacterial microorganisms in these products. In this study, 454-pyrosequencing analysis of the total bacterial occurrence in 31 brands of “Spirulina” dietary supplements from the Greek market was applied for the first time. In all samples, operational taxonomic units (OTUs) ofArthrospira platensiswere the predominant cyanobacteria. Some products contained additional cyanobacterial OTUs including a few known potentially toxic taxa. Moreover, 469 OTUs were detected in all 31 products collectively, with most of them being related to the Proteobacteria, Firmicutes, Bacteroidetes, Actinobacteria and Verrucomicrobia. All samples included heterotrophic bacterial OTUs, ranging from 9–157 per product. Among the most common OTUs were ones closely related to taxa known for causing health issues (i.e.,Pseudomonas,Flavobacterium,Vibrio,Aeromonas,Clostridium,Bacillus,Fusobacterium,Enterococcus). The observed high cyanobacterial and heterotrophic bacterial OTUs richness in the final product is a point for further research on the growth and processing ofArthrospirabiomass for commercial purposes.

scholarly journals Azukisapogenol Triterpene Glycosides from Oxytropis chiliophylla Royle

Molecules ◽  
2018 ◽  
Vol 23 (10) ◽  
pp. 2448
Author(s):  
Jun Wang ◽  
Hongshuai Yang ◽  
Yang Liu ◽  
Kelsang Norbo ◽  
Kewu Zeng ◽  
...  
Keyword(s):  
Methyl Ester ◽  
Glucuronic Acid ◽  
Acid Methyl Ester ◽  
Triterpene Glycosides ◽  
Raw 264.7 Cells ◽  
No Production ◽  
Acid Methyl ◽  
Potent Inhibition ◽  
New Compounds ◽  
First Time

Eight azukisapogenol triterpene glycosides, including five new compounds, oxychiliotriterpenosides A–E (1–5), two new methyl glucuronide derivatives that proved to be artifacts, oxychiliotriterpenoside E-glucuronic acid methyl ester (6) and myrioside B-glucuronic acid methyl ester (7), and a known one, myrioside B (8), was isolated from the aerial part of Oxytropis chiliophylla Royle. Their structures were elucidated based on extensive spectroscopic analyses and chemical methods. Triterpene glycosides were first obtained from O. chiliophylla, and those containing a galactose unit (1, 2, 5 and 6) and diglucosidic or triglucosidic linkage at C-29 (1–4), were reported from Oxytropis species for the first time, which might be recognized as a chemotaxonomic feature of O. chiliophylla. All isolated compounds were evaluated for their anti-inflammatory activities against NO production using lipopolysaccharide (LPS)-induced RAW 264.7 cells, but no compounds showed potent inhibition on NO production.

New Hopane Triterpenoids From Lichens in the Family Physiaceae

1989 ◽  
Vol 42 (8) ◽  
pp. 1415 ◽  
Author(s):  
AL Wilkins ◽  
JA Elix ◽  
KL Gaul ◽  
R Moberg
Keyword(s):  
Methyl Ester ◽  
Natural Occurrence ◽  
Two Dimensional ◽  
Triterpene Acid ◽  
The Family ◽  
First Time

Three new hopane triterpenes have been isolated from lichens of the family Physciaceae. Two of the triterpenes, 22-hydroxyhopan-6-one (2) and 6 α-acetoxyhopan-22-ol (1b), have been characterized previously but their natural occurrence is reported for the first time, while a new triterpene acid [ aipolic acid (1c)], was isolated and characterized as the corresponding methyl ester. One- and two-dimensional 1H-1H and 13C-lH correlated n.m.r. studies have revealed methyl aipolate to be methyl 6#945;-acetoxy-22-hydroxyhopan-25-oate (1d).

scholarly journals Isolation and Preparation of ent-2,3-Secobeyer-15-en-2,3-dioic acid, 3-methyl ester- A Natural Product from Spirostachys africana

2007 ◽  
Vol 2 (7) ◽  
pp. 1934578X0700200
Author(s):  
Namboole Moses Munkombwe ◽  
Disah Dijogadifele ◽  
Ngonye Sabure
Keyword(s):  
Methyl Ester ◽  
Natural Product ◽  
Spectroscopic Methods ◽  
Dioic Acid

A new secobeyerenoic acid mono ester, ent-2,3-secobeyer-15-en-2,3-dioic acid, 3-methyl ester was isolated from the heartwood of Spirostachys africana and identified using spectroscopic methods. The mono ester was also prepared using two methods; by reacting the known diacid, ent-2,3-secobeyer-15-en-2,3-dioic acid with 1.5 mole equivalency of diazomethane, and methanolysis of ent-2,3-secobeyer-15-en-2,3-dioic anhydride.

scholarly journals Synthesis and SAR of the antistaphylococcal natural product nematophin from Xenorhabdus nematophila

2019 ◽  
Vol 15 ◽  
pp. 535-541
Author(s):  
Frank Wesche ◽  
Hélène Adihou ◽  
Thomas A Wichelhaus ◽  
Helge B Bode
Keyword(s):  
Natural Product ◽  
Activity Relationship ◽  
Xenorhabdus Nematophila ◽  
Structure Activity ◽  
Multiresistant Bacteria ◽  
Improper Use ◽  
Relationship Of ◽  
First Time ◽  
Synthetic Derivatives ◽  
Fluorescent Derivatives

The repeated and improper use of antibiotics had led to an increased number of multiresistant bacteria. Therefore, new lead structures are needed. Here, the synthesis and an expanded structure–activity relationship of the simple and antistaphylococcal amide nematophin from Xenorhabdus nematophila and synthetic derivatives are described. Moreover, the synthesis of intrinsic fluorescent derivatives, incorporating azaindole moieties was achieved for the first time.

scholarly journals Volatile Components from Selected Tahitian Liverworts

2009 ◽  
Vol 4 (10) ◽  
pp. 1934578X0900401 ◽  
Author(s):  
Agnieszka Ludwiczuk ◽  
Ismiarni Komala ◽  
André Pham ◽  
Jean-Pierre Bianchini ◽  
Phila Raharivelomanana ◽  
...  
Keyword(s):  
Methyl Ester ◽  
Vanillic Acid ◽  
Acid Methyl Ester ◽  
Volatile Components ◽  
Acid Methyl ◽  
Unpleasant Odor ◽  
First Time

Six Tahitian liverworts, Trichocolea pluma, Chandonanthus hirtellus, Mastigophora diclados, Jungermannia sp., Plagiochila sp. and Cyathodium foetidissimum were chemically investigated. All of these liverworts produce their own characteristic compounds. Vanillic acid methyl ester was isolated for the first time from T. pluma. Skatol is responsible for the very intense unpleasant odor of C. foetidissimum. Herbertane-type sesquiterpenoids are peculiar components of M. diclados, and fusicoccane-type diterpenoids were identified in Pagiochila sp. Cembranes and ent-verticillanes were isolated from C. hirtellus and also detected in Jungermannia species. C. hirtellus also biosynthesizes algal components and such results may suggest that some liverworts originate from algae.

scholarly journals A First Approach to the Chemical Composition and Antioxidant Potential of Guinea-Bissau Propolis

2019 ◽  
Vol 14 (5) ◽  
pp. 1934578X1984413 ◽  
Author(s):  
Soraia I. Falcão ◽  
Mélissa Lopes ◽  
Miguel Vilas-Boas
Keyword(s):  
Antioxidant Activity ◽  
Chemical Composition ◽  
Physicochemical Properties ◽  
Natural Product ◽  
Broad Spectrum ◽  
Biological Activities ◽  
Chemical Diversity ◽  
Antioxidant Potential ◽  
Phenolic Composition ◽  
First Time

Propolis is a natural product derived from plant resins collected by honeybees and used in the beehive as a construction and defensive material. The broad spectrum of biological activities is dependent on the chemical diversity of its composition which is determined by the floral sources at the site of collection. For the first time, the chemical composition of Guinean propolis as well as its physicochemical properties, phenolic composition, and antioxidant activity was assessed. Eight compounds were identified through LC/DAD/ESI-MS n , mostly isoflavonoids, resembling Nigerian and Brazilian red propolis from the genus Dalbergia.

scholarly journals Alkaloide in Tabernaemontana-Arten, XI [1]. Untersuchung der Alkaloide von Tabernaemontana quadrangularis — (20R)-20-Hydroxyibogamin, ein neues Alkaloid aus T. quadrangularis / Alkaloids in Tabernaemontana Species, XI [1]. Investigation of the Alkaloids from Tabernaemontana quadrangularis — (20R)-20-Hydroxyibogamine, a New Alkaloid from T. quadrangularis

1980 ◽  
Vol 35 (2) ◽  
pp. 219-225 ◽  
Author(s):  
Hans Achenbach ◽  
Bernd Raffelsberger
Keyword(s):  
Natural Product ◽  
Methanolic Extract ◽  
First Time

AbstractFrom the methanolic extract from the roots of T. quadrangularis we isolated 14 alkaloids (1-14) and deduced their structures. All the alkaloids are of the ibogamine-type or im-mediately related to it; (20R)-20-hydroxyibogamine (5) was found for the first time as a natural product.

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