Ricin accumulation and degradation during castor seed development and late germination

Barnes, Daniel J.; Baldwin, Brian S.; Braasch, Dwaine A.

doi:10.1016/j.indcrop.2009.04.003

Cited by 27 publications

(17 citation statements)

References 17 publications

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“…1), we can rule out the possibility that the ricin isoforms identified are derived from the endosperm. So far ricin [24] or its transcripts [25] have not been detected in castor bean seed tissues other than endosperm and thus our results are unforeseen. Ricin is a ribosome-inactivating protein that acts through the hydrolysis of the N-glycosidic bond between the base and the ribose at position A4324 in the 28S rRNA of rat and which during seed development is deposited within protein bodies of the endosperm along with storage proteins [26].…”

Section: Resultscontrasting

confidence: 61%

Proteomic profile of the nucellus of castor bean (Ricinus communis L.) seeds during development

Nogueira

Palmisano

Soares

et al. 2012

Journal of Proteomics

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Section: Resultscontrasting

confidence: 61%

Proteomic profile of the nucellus of castor bean (Ricinus communis L.) seeds during development

Nogueira

Palmisano

Soares

et al. 2012

Journal of Proteomics

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“…A high oxygen content due polysaccharides such as cellulose and hemicellulose is observed (Huber, Iborra, & Corma, 2006). In addition, significant nitrogen content attributable to the presence of some proteins, particularly ricin, is also seen (Barnes et al, 2009). …”

Section: Resultsmentioning

confidence: 95%

“…Castor oil is widely used in industry. After its extraction, the disposal of the remaining solid management is challenging due to the presence of toxins such as ricin and ricinine (Barnes, Baldwin, & Braasch, 2009), therefore, it is significant to find a path to reutilize this waste, to generate add-on values. The aim of this work is to explore a one-pot synthesis solutions: by exploring both physical and chemical activation to convert castor de-oiled cake residue into useful ACs, which in-turn could be used as Ni-Mo catalyst supports for the HDO reaction.…”

Section: Introductionmentioning

confidence: 99%

HDO del guaiacol mediante el uso de catalizadores NiMo soportados sobre carbón activado obtenido a partir de la torta de higuerilla

Ospina¹,

Buitrago‐Sierra²,

López³

2015

ing.inv.

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Physical and chemical activation methods were used to prepare two different activated carbons (ACs) from castor de-oiled cake. H 2 O/CO 2 mixture was used as the physical activating agent, and for chemical activation potassium carbonate (K 2 CO 3 ) was used. For both materials, textural and chemical properties were characterized by N 2 adsorption-desorption isotherms, thermogravimetric analysis (TGA), Fourier Transform Infrared Spectroscopy (FTIR), thermal programmed reduction (TPR), X-ray fluorescence (XRF), and scanning electron microscopy (SEM). The ACs were used as supports for NiMo sulfide catalysts, which were prepared by wetness impregnation and in-situ sulfided for the hydrodeoxygenation (HDO) of guaiacol (GUA) as a model compound of bio-oil. The HDO reaction was carried out in a typical batch reactor at 5 MPa of H 2 and 350 °C. Under the same test conditions, commercial catalysts were also tested in the reaction. Although the commercial catalysts displayed higher GUA conversion, the prepared catalysts showed higher activity and non-oxygenated and saturated products yield.Keywords: Castor de-oiled cake, activated carbon, hydrodeoxygenation, bio-oils. RESUMENSe prepararon dos carbones activados a partir de la torta de higuerilla; como métodos para su obtención se usaron la activación física y la activación química. Para la activación física se usó una mezcla H 2 O/CO 2 como agente activante, y para la activación química, K 2 CO 3 . Las propiedades químicas y texturales de ambos carbones activados fueron caracterizados por isotermas de adsorción-desorción de N 2 , análisis termogravimétrico (TGA), espectroscopia infrarroja (FT-IR), reducción a temperatura programada (TPR), fluorescencia de rayos X (XRF) y microscopía electrónica de barrido (SEM). Los carbones activados se usaron como soporte en catalizadores NiMo sulfurados, los cuales fueron preparados por impregnación húmeda y reducidos in-situ para la reacción de hidrodesoxigenación del guaiacol (GUA), compuesto modelo de los aceites de pirólisis. La reacción de hidrodesoxigenación (HDO) se realizó en un reactor tipo batch a 5 MPa de H 2 y 350 °C. Con el fin de comparar, los catalizadores comerciales también se probaron en reacción. A pesar de que los catalizadores comerciales mostraron una mayor conversión de GUA, los catalizadores sintetizados exhibieron una mayor actividad y un mayor rendimiento en la producción de compuestos saturados y no oxigenados.Palabras clave: Torta de higuerilla, carbón activado, hidrodesoxigenación, bioaceites.

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“…For instance, the highly toxic ricin is responsible to protect Ricinus communis seeds from invading pests and pathogens (Barnes et al 2009). Although most type 2 RIPs show a much lower toxicity for animal cells compared to ricin, the accumulation of these less toxic type 2 RIPs can also play an important role in plant defense .…”

Section: Role Of Type 2 Rips In Plant Defensementioning

confidence: 99%

Plant AB Toxins with Lectin Domains

Shang¹,

Dang²,

Damme³

2015

Plant Toxins

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As part of their defense system different plant species each express a diverse set of defense proteins, among them proteins with lectin domains. The whole group of plant lectins assembles all proteins that have the ability to recognize and bind specific carbohydrate structures. Based on the sequence and the conformation of the carbohydrate recognition domains several lectin families are distinguished. Although many lectins are composed only of carbohydrate binding domains, several lectins are chimeric proteins composed of a lectin domain and another unrelated domain. In some cases this second domain can be considered as a toxin domain. This chapter focuses on different types of plant AB toxins and their physiological importance in the battle against pathogens and predators. Most information is available on type 2 ribosome-inactivating proteins in which an N-glycosidase domain is linked through a disulfide bridge to a lectin domain. More recently chimeric proteins consisting of one or more lectin domains and a dirigent domain or aerolysin domain have also been discovered. Although these AB toxins all consist of a lectin domain and a toxin domain, the nature of the toxin and the lectin domain are different resulting in proteins with different carbohydrate binding properties as well as a different mode of action for toxicity.

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Ricin accumulation and degradation during castor seed development and late germination

Cited by 27 publications

References 17 publications

Proteomic profile of the nucellus of castor bean (Ricinus communis L.) seeds during development

Proteomic profile of the nucellus of castor bean (Ricinus communis L.) seeds during development

HDO del guaiacol mediante el uso de catalizadores NiMo soportados sobre carbón activado obtenido a partir de la torta de higuerilla

Plant AB Toxins with Lectin Domains

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