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  1. Artikel: Gelatin structure and composition linked to hard capsule dissolution: A review

    Duconseille, Anne / Filip Meersman / Naira Quintana / Thierry Astruc / Véronique Sante-Lhoutellier

    Food hydrocolloids. 2015 Jan., v. 43

    2015  

    Abstract: Gelatin obtained from pig skin constitutes about 50% of world production and is mainly composed of collagen extracted from skin by acidic baths and thermal treatments. The gelatin is used to make various products, notably hard gelatin capsules (HGC) ... ...

    Abstract Gelatin obtained from pig skin constitutes about 50% of world production and is mainly composed of collagen extracted from skin by acidic baths and thermal treatments. The gelatin is used to make various products, notably hard gelatin capsules (HGC) which of varying solubility in water. This issue has been known for many years and has been, and remains, a subject of study and debate. The main reason for low gelatin dissolution rates is its tendency to form cross-links in the denatured collagen chains under specific conditions which stabilize the gel network and prevent dissolution. As it is extracted from animal tissues, gelatin may contain molecules other than collagen (sugars, lipids and other proteins) which may react with collagen chains to form covalent bonds. Although this biopolymer has been the subject of numerous publications, its structure and composition is not well defined. Indeed, there are many differences from an article to another. Consequently, the causes of HGC dissolution are not well identified and controlled.
    Schlagwörter animal tissues ; biopolymers ; collagen ; crosslinking ; gelatin ; heat treatment ; hydrocolloids ; lipids ; sugars ; swine ; water solubility
    Sprache Englisch
    Erscheinungsverlauf 2015-01
    Umfang p. 360-376.
    Erscheinungsort Elsevier Ltd
    Dokumenttyp Artikel
    ZDB-ID 742742-6
    ISSN 1873-7137 ; 0268-005X
    ISSN (online) 1873-7137
    ISSN 0268-005X
    DOI 10.1016/j.foodhyd.2014.06.006
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  2. Artikel: Do allelopathic compounds in invasive Solidago canadensis s.l. restrain the native European flora

    Abhilasha, Dipti / Quintana, Naira / Vivanco, Jorge / Joshi, Jasmin

    Journal of ecology. 2008 Sept., v. 96, no. 5

    2008  

    Abstract: 1. One mechanism explaining the success of invasive weeds may be the production and release of allelopathic compounds by the invader that, due to a lack of co-evolutionary history, have harmful effects on plant neighbours in the introduced range. 2. We ... ...

    Abstract 1. One mechanism explaining the success of invasive weeds may be the production and release of allelopathic compounds by the invader that, due to a lack of co-evolutionary history, have harmful effects on plant neighbours in the introduced range. 2. We partially tested this hypothesis by growing seven competing native European plant species either with the introduced Solidago canadensis s.l., one of the most successful invasive plants in Europe or on soil pre-cultivated with S. canadensis. We added activated carbon to the soil to neutralize organic chemical compounds with putative allelopathic effects. Furthermore, we added unsterilized soil inocula from the introduced (Switzerland) or native (USA) range to the soil to test potential confounding effects of soil microbes on invasion success. Untreated sterilized soil served as control. 3. Five out of the seven native species were more competitive against the invasive species in soils with activated carbon than without, supporting the allelopathy hypothesis. However, competitive outcomes were also influenced by the two sources of soil inoculum and by interactive effects of soil inoculum and Solidago origin suggesting that soil microbes alter allelopathic effects. 4. Achillea millefolium, the species least affected by the presence of S. canadensis and with no response to the activated carbon treatment is the only species used in this experiment reported to grow within Solidago stands in Europe, whereas the other European species tested tend to grow at the periphery of invasive Solidago stands. 5. Chemical analysis by LC-MS of Solidago root extracts revealed four main secondary chemical compounds with potential allelopathic effects. Root exudates of Solidago showed a significant inhibitory effect on growth of the model plant species Arabidopsis thaliana. The magnitude of inhibition increased with increasing concentration of the extract. 6. Synthesis. Levels of the four compounds were lower in Solidago populations from the invasive range than in populations of the same ploidy level from the native range. This suggests lower investment of invasive plants into these secondary compounds, possibly because of a higher susceptibility of plant competitors in the invasive range to these substances.
    Schlagwörter activated carbon ; allelopathy ; root exudates
    Sprache Englisch
    Erscheinungsverlauf 2008-09
    Umfang p. 993-1001.
    Verlag Blackwell Publishing Ltd
    Erscheinungsort Oxford, UK
    Dokumenttyp Artikel
    ZDB-ID 3023-5
    ISSN 0022-0477
    ISSN 0022-0477
    DOI 10.1111/j.1365-2745.2008.01413.x
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  3. Artikel: Renewable energy from Cyanobacteria: energy production optimization by metabolic pathway engineering

    Quintana, Naira / Van der Kooy, Frank / Van de Rhee, Miranda D / Voshol, Gerben P / Verpoorte, Robert

    Applied microbiology and biotechnology.. 2011 Aug., v. 91, no. 3

    2011  

    Abstract: The need to develop and improve sustainable energy resources is of eminent importance due to the finite nature of our fossil fuels. This review paper deals with a third generation renewable energy resource which does not compete with our food resources, ... ...

    Abstract The need to develop and improve sustainable energy resources is of eminent importance due to the finite nature of our fossil fuels. This review paper deals with a third generation renewable energy resource which does not compete with our food resources, cyanobacteria. We discuss the current state of the art in developing different types of bioenergy (ethanol, biodiesel, hydrogen, etc.) from cyanobacteria. The major important biochemical pathways in cyanobacteria are highlighted, and the possibility to influence these pathways to improve the production of specific types of energy forms the major part of this review.
    Schlagwörter Cyanobacteria ; biochemical pathways ; biodiesel ; energy ; ethanol ; foods ; fossil fuels ; hydrogen
    Sprache Englisch
    Erscheinungsverlauf 2011-08
    Umfang p. 471-490.
    Erscheinungsort Springer-Verlag
    Dokumenttyp Artikel
    ZDB-ID 392453-1
    ISSN 1432-0614 ; 0171-1741 ; 0175-7598
    ISSN (online) 1432-0614
    ISSN 0171-1741 ; 0175-7598
    DOI 10.1007/s00253-011-3394-0
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  4. Artikel ; Online: Phytotoxic compounds from roots of Centaurea diffusa Lam.

    Quintana, Naira / El Kassis, Elie G / Stermitz, Frank R / Vivanco, Jorge M

    Plant signaling & behavior

    2009  Band 4, Heft 1, Seite(n) 9–14

    Abstract: An extract of roots of Centaurea diffusa (diffuse knapweed) yielded caryophyllene oxide and linoleic acid which were shown to be phytotoxic. Also isolated were germacrene B, a previously-known phytotoxin as well as the inactive polyene aplotaxene. A ... ...

    Abstract An extract of roots of Centaurea diffusa (diffuse knapweed) yielded caryophyllene oxide and linoleic acid which were shown to be phytotoxic. Also isolated were germacrene B, a previously-known phytotoxin as well as the inactive polyene aplotaxene. A combination of these compounds, if transferred to the soil, could be one factor in the invasive behavior of this weed. Contrary to a literature report, 8-hydroxyquinoline was not detected in root exudates of in vitro grown C. diffusa nor could it be identified in the root extract. However, a recent report from a different group maintains that 8-hydroxyquinoline can be released from roots of C. diffusa following a diurnal rhythm.
    Mesh-Begriff(e) Arabidopsis/drug effects ; Centaurea/metabolism ; Chromatography, High Pressure Liquid ; Linoleic Acid/metabolism ; Linoleic Acid/toxicity ; Oxyquinoline/metabolism ; Oxyquinoline/toxicity ; Plant Roots/metabolism ; Polycyclic Sesquiterpenes ; Seedlings/drug effects ; Sesquiterpenes/metabolism ; Sesquiterpenes/toxicity ; Sesquiterpenes, Germacrane/metabolism ; Sesquiterpenes, Germacrane/toxicity
    Chemische Substanzen Polycyclic Sesquiterpenes ; Sesquiterpenes ; Sesquiterpenes, Germacrane ; Oxyquinoline (5UTX5635HP) ; Linoleic Acid (9KJL21T0QJ) ; caryophyllene oxide (S2XU9K448U)
    Sprache Englisch
    Erscheinungsdatum 2009-06-30
    Erscheinungsland United States
    Dokumenttyp Journal Article ; Research Support, U.S. Gov't, Non-P.H.S.
    ISSN 1559-2324
    ISSN (online) 1559-2324
    DOI 10.4161/psb.4.1.7487
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  5. Artikel ; Online: Renewable energy from Cyanobacteria: energy production optimization by metabolic pathway engineering.

    Quintana, Naira / Van der Kooy, Frank / Van de Rhee, Miranda D / Voshol, Gerben P / Verpoorte, Robert

    Applied microbiology and biotechnology

    2011  Band 91, Heft 3, Seite(n) 471–490

    Abstract: The need to develop and improve sustainable energy resources is of eminent importance due to the finite nature of our fossil fuels. This review paper deals with a third generation renewable energy resource which does not compete with our food resources, ... ...

    Abstract The need to develop and improve sustainable energy resources is of eminent importance due to the finite nature of our fossil fuels. This review paper deals with a third generation renewable energy resource which does not compete with our food resources, cyanobacteria. We discuss the current state of the art in developing different types of bioenergy (ethanol, biodiesel, hydrogen, etc.) from cyanobacteria. The major important biochemical pathways in cyanobacteria are highlighted, and the possibility to influence these pathways to improve the production of specific types of energy forms the major part of this review.
    Mesh-Begriff(e) Biofuels/microbiology ; Conservation of Energy Resources ; Cyanobacteria/metabolism ; Energy Metabolism ; Metabolic Networks and Pathways
    Chemische Substanzen Biofuels
    Sprache Englisch
    Erscheinungsdatum 2011-06-21
    Erscheinungsland Germany
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 392453-1
    ISSN 1432-0614 ; 0171-1741 ; 0175-7598
    ISSN (online) 1432-0614
    ISSN 0171-1741 ; 0175-7598
    DOI 10.1007/s00253-011-3394-0
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  6. Artikel ; Online: Metabolic changes in Agrobacterium tumefaciens-infected Brassica rapa.

    Simoh, Sanimah / Quintana, Naira / Kim, Hye Kyong / Choi, Young Hae / Verpoorte, Robert

    Journal of plant physiology

    2009  Band 166, Heft 10, Seite(n) 1005–1014

    Abstract: Agrobacterium has the ability to transfer its genetic material, T-DNA, into the plant genome. The unique interaction between the bacterium and its host plant has been well studied at the transcriptome, but not at the metabolic level. For a better ... ...

    Abstract Agrobacterium has the ability to transfer its genetic material, T-DNA, into the plant genome. The unique interaction between the bacterium and its host plant has been well studied at the transcriptome, but not at the metabolic level. For a better understanding of this interaction it is necessary to investigate the metabolic changes of the host plant upon infection with Agrobacterium tumefaciens. This study investigated the metabolic response of Brassica rapa to infection with disarmed and tumor-inducing strains of A. tumefaciens using (1)H nuclear magnetic resonance spectroscopy combined with multivariate data analysis. The partial least square-discriminant analysis (PLS-DA) of two varieties of B. rapa showed that there was a clear differentiation in the metabolite profiles of B. rapa leaves infected with the disarmed strain LBA4404 and with tumor-inducing octopine and nopaline strains, particularly in the flavonoid, phenylpropanoid, sugar and free amino/organic acid contents. However, individual PLS-DA of each type of infection suggests that, in general, some flavonoids and phenylpropanoids were suppressed as a consequence of these infections. The results obtained in this study indicate that the disarmed strain LBA4404 and tumor-inducing strains have different effects on the metabolite profile of B. rapa.
    Mesh-Begriff(e) Agrobacterium tumefaciens/growth & development ; Agrobacterium tumefaciens/physiology ; Brassica rapa/metabolism ; Brassica rapa/microbiology ; Flavonoids/metabolism ; Gene Expression Regulation, Plant/genetics ; Gene Expression Regulation, Plant/physiology ; Least-Squares Analysis ; Magnetic Resonance Spectroscopy ; Multivariate Analysis ; Phenylpropionates/metabolism ; Plant Leaves/metabolism ; Plant Leaves/microbiology
    Chemische Substanzen Flavonoids ; Phenylpropionates
    Sprache Englisch
    Erscheinungsdatum 2009-04-05
    Erscheinungsland Germany
    Dokumenttyp Journal Article
    ZDB-ID 283647-6
    ISSN 1618-1328 ; 0176-1617
    ISSN (online) 1618-1328
    ISSN 0176-1617
    DOI 10.1016/j.jplph.2008.11.015
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  7. Artikel: Metabolic changes in Agrobacterium tumefaciens-infected Brassica rapa

    Simoh, Sanimah / Quintana, Naira / Kim, Hye Kyong / Choi, Young Hae / Verpoorte, Robert

    Journal of plant physiology. 2009 July 1, v. 166, issue 10

    2009  

    Abstract: Agrobacterium has the ability to transfer its genetic material, T-DNA, into the plant genome. The unique interaction between the bacterium and its host plant has been well studied at the transcriptome, but not at the metabolic level. For a better ... ...

    Abstract Agrobacterium has the ability to transfer its genetic material, T-DNA, into the plant genome. The unique interaction between the bacterium and its host plant has been well studied at the transcriptome, but not at the metabolic level. For a better understanding of this interaction it is necessary to investigate the metabolic changes of the host plant upon infection with Agrobacterium tumefaciens. This study investigated the metabolic response of Brassica rapa to infection with disarmed and tumor-inducing strains of A. tumefaciens using 1H nuclear magnetic resonance spectroscopy combined with multivariate data analysis. The partial least square-discriminant analysis (PLS-DA) of two varieties of B. rapa showed that there was a clear differentiation in the metabolite profiles of B. rapa leaves infected with the disarmed strain LBA4404 and with tumor-inducing octopine and nopaline strains, particularly in the flavonoid, phenylpropanoid, sugar and free amino/organic acid contents. However, individual PLS-DA of each type of infection suggests that, in general, some flavonoids and phenylpropanoids were suppressed as a consequence of these infections. The results obtained in this study indicate that the disarmed strain LBA4404 and tumor-inducing strains have different effects on the metabolite profile of B. rapa.
    Schlagwörter Brassica rapa ; genetic variation ; metabolome ; chemical constituents of plants ; spectral analysis ; multivariate analysis ; Agrobacterium tumefaciens ; plant pathogenic bacteria ; strain differences ; nuclear magnetic resonance spectroscopy
    Sprache Englisch
    Erscheinungsverlauf 2009-0701
    Umfang p. 1005-1014.
    Dokumenttyp Artikel
    ZDB-ID 283647-6
    ISSN 1618-1328 ; 0176-1617
    ISSN (online) 1618-1328
    ISSN 0176-1617
    DOI 10.1016/j.jplph.2008.11.015
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  8. Artikel: Phytotoxic polyacetylenes from roots of Russian knapweed (Acroptilon repens (L.) DC.).

    Quintana, Naira / Weir, Tiffany L / Du, Jiang / Broeckling, Corey D / Rieder, Julie P / Stermitz, Frank R / Paschke, Mark W / Vivanco, Jorge M

    Phytochemistry

    2008  Band 69, Heft 14, Seite(n) 2572–2578

    Abstract: There are several factors thought to assist invasive weeds in colonization of ecosystems. One of these factors is allelopathy, the negative effect of chemicals produced by one plant on neighboring plants, frequently mediated through root exudates and ... ...

    Abstract There are several factors thought to assist invasive weeds in colonization of ecosystems. One of these factors is allelopathy, the negative effect of chemicals produced by one plant on neighboring plants, frequently mediated through root exudates and other plant leachates. Acroptilon repens (Asteraceae) is one of the most invasive and ecologically threatening weed species in western North America. A bioassay-guided fractionation of the root extracts of this plant led to the isolation of five polyacetylenic compounds, of which one [5'-methoxy-1'-(5-prop-1-yn-1-yl-2-thienyl)-hexa-2',4'-diyin-6'-yl acetate] was hitherto unknown. The structures of these compounds were elucidated on the basis of spectroscopic analysis (IR, ESIMS, (1)H, (13)C NMR and 2D NMR). All of the compounds obtained, except 1-chloro-4-(5-penta-1,3-diyn-1-yl-2-thienyl)but-3-yn-2-ol, showed phytotoxic activity against Arabidopsis thaliana seedlings. The presence of 4'-chloro-1'-(5-penta-1,3-diyn-1-yl-2-thienyl)-but-2'-yn-3'-ol was detected in the root exudates of aeroponically grown A. repens plants. None of the polyacetylenes isolated in this study were found in Colorado soils collected between September 2006 and July 2007 in an A. repens colonized site. However, polyacetylene 5 in A. repens infested soil from Washington was found in June, 2007. Contrary to our previous report, the compound 7,8-benzoflavone (6) was not detected in root exudates, nor was it encountered in extracts of roots, aerial parts or infested soil. Since we could not repeat this work, the original report has been retracted [Stermitz, F.R., Bais, H.P., Foderaro, T.A., Vivanco, J.M., 2003. 7,8-Benzoflavone: a phytotoxin from root exudates of invasive Russian knapweed [A retraction]. Phytochemistry 64, 493-497.].
    Mesh-Begriff(e) Arabidopsis/drug effects ; Asteraceae/chemistry ; Chromatography, High Pressure Liquid ; Molecular Structure ; North America ; Plant Roots/chemistry ; Polyacetylenes/chemistry ; Polyacetylenes/isolation & purification ; Polyacetylenes/pharmacology ; Seedlings/drug effects ; Soil/analysis
    Chemische Substanzen Soil ; Polyacetylenes (25067-58-7)
    Sprache Englisch
    Erscheinungsdatum 2008-10
    Erscheinungsland England
    Dokumenttyp Journal Article ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 208884-8
    ISSN 1873-3700 ; 0031-9422
    ISSN (online) 1873-3700
    ISSN 0031-9422
    DOI 10.1016/j.phytochem.2008.07.015
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  9. Artikel ; Audio / Video: Phytotoxic polyacetylenes from roots of Russian knapweed (Acroptilon repens (L.) DC.)

    Quintana, Naira / Weir, Tiffany L / Du, Jiang / Broeckling, Corey D / Rieder, Julie P / Stermitz, Frank R / Paschke, Mark W / Vivanco, Jorge M

    Phytochemistry. 2008 Oct., v. 69, issue 14

    2008  

    Abstract: There are several factors thought to assist invasive weeds in colonization of ecosystems. One of these factors is allelopathy, the negative effect of chemicals produced by one plant on neighboring plants, frequently mediated through root exudates and ... ...

    Abstract There are several factors thought to assist invasive weeds in colonization of ecosystems. One of these factors is allelopathy, the negative effect of chemicals produced by one plant on neighboring plants, frequently mediated through root exudates and other plant leachates. Acroptilon repens (Asteraceae) is one of the most invasive and ecologically threatening weed species in western North America. A bioassay-guided fractionation of the root extracts of this plant led to the isolation of five polyacetylenic compounds, of which one [5'-methoxy-1'-(5-prop-1-yn-1-yl-2-thienyl)-hexa-2',4'-diyin-6'-yl acetate] was hitherto unknown. The structures of these compounds were elucidated on the basis of spectroscopic analysis (IR, ESIMS, 1H, 13C NMR and 2D NMR). All of the compounds obtained, except 1-chloro-4-(5-penta-1,3-diyn-1-yl-2-thienyl)but-3-yn-2-ol, showed phytotoxic activity against Arabidopsis thaliana seedlings. The presence of 4'-chloro-1'-(5-penta-1,3-diyn-1-yl-2-thienyl)-but-2'-yn-3'-ol was detected in the root exudates of aeroponically grown A. repens plants. None of the polyacetylenes isolated in this study were found in Colorado soils collected between September 2006 and July 2007 in an A. repens colonized site. However, polyacetylene 5 in A. repens infested soil from Washington was found in June, 2007. Contrary to our previous report, the compound 7,8-benzoflavone (6) was not detected in root exudates, nor was it encountered in extracts of roots, aerial parts or infested soil. Since we could not repeat this work, the original report has been retracted [Stermitz, F.R., Bais, H.P., Foderaro, T.A., Vivanco, J.M., 2003. 7,8-Benzoflavone: a phytotoxin from root exudates of invasive Russian knapweed [A retraction]. Phytochemistry 64, 493-497.].
    Schlagwörter Rhaponticum repens ; weeds ; invasive species ; root exudates ; allelochemicals ; polyacetylenes ; chemical structure ; spectral analysis ; phytotoxicity ; bioassays ; Arabidopsis thaliana ; soil chemical properties ; Colorado ; Washington
    Sprache Englisch
    Erscheinungsverlauf 2008-10
    Umfang p. 2572-2578.
    Dokumenttyp Artikel ; Audio / Video
    ZDB-ID 208884-8
    ISSN 1873-3700 ; 0031-9422
    ISSN (online) 1873-3700
    ISSN 0031-9422
    DOI 10.1016/j.phytochem.2008.07.015
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  10. Artikel ; Online: An ABC transporter mutation alters root exudation of phytochemicals that provoke an overhaul of natural soil microbiota.

    Badri, Dayakar V / Quintana, Naira / El Kassis, Elie G / Kim, Hye Kyong / Choi, Young Hae / Sugiyama, Akifumi / Verpoorte, Robert / Martinoia, Enrico / Manter, Daniel K / Vivanco, Jorge M

    Plant physiology

    2009  Band 151, Heft 4, Seite(n) 2006–2017

    Abstract: Root exudates influence the surrounding soil microbial community, and recent evidence demonstrates the involvement of ATP-binding cassette (ABC) transporters in root secretion of phytochemicals. In this study, we examined effects of seven Arabidopsis ( ... ...

    Abstract Root exudates influence the surrounding soil microbial community, and recent evidence demonstrates the involvement of ATP-binding cassette (ABC) transporters in root secretion of phytochemicals. In this study, we examined effects of seven Arabidopsis (Arabidopsis thaliana) ABC transporter mutants on the microbial community in native soils. After two generations, only the Arabidopsis abcg30 (Atpdr2) mutant had significantly altered both the fungal and bacterial communities compared with the wild type using automated ribosomal intergenic spacer analysis. Similarly, root exudate profiles differed between the mutants; however, the largest variance from the wild type (Columbia-0) was observed in abcg30, which showed increased phenolics and decreased sugars. In support of this biochemical observation, whole-genome expression analyses of abcg30 roots revealed that some genes involved in biosynthesis and transport of secondary metabolites were up-regulated, while some sugar transporters were down-regulated compared with genome expression in wild-type roots. Microbial taxa associated with Columbia-0 and abcg30 cultured soils determined by pyrosequencing revealed that exudates from abcg30 cultivated a microbial community with a relatively greater abundance of potentially beneficial bacteria (i.e. plant-growth-promoting rhizobacteria and nitrogen fixers) and were specifically enriched in bacteria involved in heavy metal remediation. In summary, we report how a single gene mutation from a functional plant mutant influences the surrounding community of soil organisms, showing that genes are not only important for intrinsic plant physiology but also for the interactions with the surrounding community of organisms as well.
    Mesh-Begriff(e) ATP-Binding Cassette Transporters/genetics ; ATP-Binding Cassette Transporters/metabolism ; Arabidopsis/genetics ; Arabidopsis/microbiology ; Arabidopsis Proteins/genetics ; Bacteria/classification ; Bacteria/genetics ; Biodiversity ; Biological Products/metabolism ; Fungi/classification ; Fungi/genetics ; Genome, Plant/genetics ; Mutation/genetics ; Plant Exudates/chemistry ; Plant Exudates/metabolism ; Plant Roots/chemistry ; Principal Component Analysis ; Sequence Analysis, DNA ; Soil Microbiology
    Chemische Substanzen ATP-Binding Cassette Transporters ; Arabidopsis Proteins ; Atpdr2 protein, Arabidopsis ; Biological Products ; Plant Exudates
    Sprache Englisch
    Erscheinungsdatum 2009-10-23
    Erscheinungsland United States
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 208914-2
    ISSN 1532-2548 ; 0032-0889
    ISSN (online) 1532-2548
    ISSN 0032-0889
    DOI 10.1104/pp.109.147462
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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