Biofuel plant species and the contribution of genetic improvement

Dias, Luíz Antônio dos Santos

doi:10.1590/s1984-70332011000500004

Cited by 24 publications

(18 citation statements)

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“…It's widely distributed in tropical and subtropical areas and has potential for biofuel production. The oil content in the seeds varies between 30 and 40% (Dias, 2011). The oil has little significant variations of acidity, besides having better oxidation stability than soy and palm oil.…”

Section: Introductionmentioning

confidence: 99%

Physiological changes in Jatropha curcas L. seeds during storage

et al. 2016

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-Oil seeds, such as J. curcas, are more prone to deterioration and consequently to loss of quality during storage. In this context, adequate technics for its preservation are of great importance. This study aimed to evaluate the effects of different environments and packaging for the conservation of J. curcas seeds during twelve months of storage. The seeds were placed in three different types of packaging: a multiwall paper bag (or Kraft paper bag); a cloth bag; and a high-density plastic bag. After this, the seeds were stored in three different conditions: a laboratory (23 ± 3 ºC; 64 ± 11% of RH); a refrigerated room (20 ± 2 o C; 55 ± 5% of RH) and a cold chamber (10 ± 2 o C; 55 ± 5% of RH). Initially and thereafter every three months, the physiological qualities (germination and vigor) of the seeds were evaluated. J. curcas seeds packed in the plastic bags and stored in a cold chamber maintained their germination potential during twelve months. There was a decline in the physiological quality of the seeds stored in the laboratory conditions, independent of the packaging used. It was concluded that the most suitable condition for the storage of J. curcas seeds was packing them in plastic bags, placed in a cold chamber (10 ± 2 o C; 55 ± 5% of RH).Index terms: oil seed, physiological quality, conservation.Alterações fisiológicas em sementes de Jatropha curcas L.durante o armazenamento RESUMO -Sementes de oleaginosas, como as de J. curcas, são mais propensas à deterioração e consequente perda de qualidade durante o armazenamento. Nesse contexto, técnicas adequadas para a sua conservação tornam-se importantes. Nesse estudo, objetivou-se avaliar diferentes ambientes e embalagens na conservação de sementes de J. curcas ao longo de doze meses de armazenamento. As sementes foram acondicionadas em diferentes embalagens: saco de papel multifoliado; saco de pano e saco plástico de alta densidade. Em seguida, foram armazenadas em diferentes condições: laboratório (23 ± 3 ºC; 64 ± 11% de UR); sala refrigerada (20 ± 2 o C; 55 ± 5% de UR) e câmara fria (10 ± 2 o C; 55 ± 5% de UR). Inicialmente, e a cada três meses, foram realizadas avaliações da qualidade fisiológica (germinação e vigor) das sementes. Sementes de J. curcas acondicionadas em saco plástico e armazenadas em câmara fria mantiveram seu potencial germinativo por doze meses. Houve redução da qualidade fisiológica das sementes mantidas em ambiente de laboratório independente da embalagem utilizada. Verificou-se que a condição mais adequada para o armazenamento das sementes de J. curcas foi o acondicionamento em saco plástico em câmara fria (10 ± 2 o C; 55 ± 5% de UR).Termos para indexação: sementes oleaginosas, qualidade fisiológica, conservação.

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Section: Introductionmentioning

confidence: 99%

Physiological changes in Jatropha curcas L. seeds during storage

et al. 2016

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“…Physic nut (Jatropha curcas L.) is an oilseed crop that belongs to the Euphorbiaceae family, and it has properties that are suitable for biodiesel production (Tiwari et al, 2007;Dias, 2011). The crop is mainly propagated by seeds collected from mother plants selected by producers, but they are marketed without a strict quality control, because there is still not an organized system in Brazil for producing and marketing these seeds .…”

Section: Introductionmentioning

confidence: 99%

Standard germination test in physic nut (Jatropha curcas L.) seeds

et al. 2014

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-Defining adequate methods to assess seed germination is important to control the quality of commercial lots, especially for species that are not yet included in the Rules for Seed Testing. This study aimed to establish an adequate procedure for germination test in physic nut seeds (J. curcas L.). Three seed lots, in eight replications of 25 seeds each, were sown on paper towel rolls moistened with a water volume equivalent to 2.7 the weight of the dry paper and in sterilized sand moistened up to 60% of its water-holding capacity. The seeds of each treatment were maintained on germination chambers at temperatures of 20, 25, 30 and 20-30 o C. Daily counts were made to define the ideal date to perform the first and the last count test. Criteria for classifying seedlings as normal and abnormal were also established. The experiment was conducted in a completely randomized design in a split plot arrangement, and the means were compared by Tukey's test (P<0.05). For maximum germination potential of physic nut seeds, the germination test should be conducted at 25 o C and 30 o C, using sand or paper towel as a substrate, with the counts at 7 and 12 days after sowing.Index terms: viability, methodology, seeds, physic nut.Teste de germinação em sementes de pinhão manso (Jatropha curcas L.) RESUMO -Estabelecer procedimento adequado para a condução do teste de germinação com espécies que ainda não constam nas Regras para Análise de Sementes é de grande importância para viabilizar a certificação e comercialização de lotes. Objetivou-se estabelecer metodologia para a condução do teste de germinação em sementes de pinhão manso (J. curcas L.). Sementes de três lotes, em oito repetições de 25, foram semeadas nos seguintes substratos: rolo de papel toalha umedecido com volume de água equivalente a 2,7 vezes o peso do papel seco, confeccionando-se rolos; areia esterilizada e umedecida até 60% da sua capacidade de retenção (entre areia). As sementes foram mantidas em germinadores nas temperaturas de 20, 25, 30 °C e 20-30 ºC, realizando-se contagens diárias para definir a data ideal para as avaliações do teste. Foram estabelecidos também critérios para a classificação das plântulas como normais e anormais. O experimento foi conduzido em DIC, em esquema de parcela subdividida. As médias dos tratamentos foram comparadas pelo teste de Tukey (P<0,05). Para a obtenção do potencial máximo de germinação das sementes de pinhão manso, o teste de germinação deve ser conduzido nas temperaturas de 25 o C ou 30 o C, utilizando-se semeadura entre areia ou em rolo de papel, com contagens aos 7 e 12 dias após a semeadura.Termos para indexação: viabilidade, metodologia, sementes, pinhão manso.

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“…55,56 (10) where the term is an estimate of the error in the intercept and the factor Δ(α, β) depends on the probability α (type I error) and β (type error II) and on the number of degrees of freedom.…”

Section: (7)mentioning

confidence: 99%

“…7,8 In this context, Jatropha curcas L., also known as physic nut, stands out as one of the most promising non-edible oil seeds for the production of biofuel. 9,10 J. curcas is a small tree or large shrub, which belongs to the Euphorbiaceae family and has a life expectancy of up to 50 years. 11 Mexico is the center of origin and domestication of J. curcas, 8,12 but this plant spontaneously grows in different regions of Brazil and around the world, including Africa, India, Southeast Asia and China.…”

Section: Introductionmentioning

confidence: 99%

Multivariate Calibration to Determine Phorbol Esters in Seeds of Jatropha curcas L. Using Near Infrared and Ultraviolet Spectroscopies

Roque¹,

Dias²,

Teófilo³

2017

J. Braz. Chem. Soc.

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The building of partial least squares (PLS) regression models using near infrared (NIR) and ultraviolet (UV) spectroscopies to estimate the concentrations of phorbol esters (PEs) in Jatropha curcas L. is presented. The models were built using two algorithms for variable selection, ordered predictors selection (OPS) and genetic algorithm (GA). Chromatographic analyses were performed to determine the concentrations of PEs. Spectral data were obtained from seeds and oil extract. The results of PLS models were performed by analyzing statistical parameters of quality such as root mean square error of prediction (RMSEP) and correlation coefficient of external predictions (R p ). The parameters obtained for NIR-PLS and UV-PLS models with OPS were respectively: RMSEP 0.48 and 0.22 mg g -1 and R p 0.49 and 0.96. For GA were obtained, respectively: RMSEP 0.52 and 0.28 mg g -1 and R p 0.12 and 0.95. The models built from seeds and oil extracts can be used respectively for screening and to accurately predict the PEs content. The OPS method provided simpler and more predictive models compared to those obtained by the selection of variables using the GA. Thus, the UV-PLS-OPS model can be used as an alternative method to quantification of PEs.Keywords: phorbol esters, Jatropha curcas L., multivariate calibration, near infrared, ultraviolet spectroscopy IntroductionCurrently, fossil fuels are the major energy source used by mankind. However, this has resulted in an increase in anthropogenic greenhouse gas emissions in the atmosphere that contributes to the increase in average temperature of the earth and complex changes in climate.1 Fossil fuels, such as gasoline and natural gas, are limited and will be insufficient for the world's energy demands in the near future. Biofuels, such as biodiesel, are a strategy that combines energy security and sustainability. 2,3 Biodiesel derived from vegetable seed oils is an alternative to diesel fuel as a renewable and environmentally clean source of energy. This fuel has been produced from a variety of vegetable sources, such as soybean, 4 sunflower, 5 palm oil 6 and physic nut. 7,8 In this context, Jatropha curcas L., also known as physic nut, stands out as one of the most promising non-edible oil seeds for the production of biofuel. 9,10 J. curcas is a small tree or large shrub, which belongs to the Euphorbiaceae family and has a life expectancy of up to 50 years. 11 Mexico is the center of origin and domestication of J. curcas, 8,12 but this plant spontaneously grows in different regions of Brazil and around the world, including Africa, India, Southeast Asia and China. 13 The J. curcas seed contains approximately 31% oil (ranging from 16 to 45%), 14 presenting a composition of fatty acids that provide biodiesel with excellent properties. 15 The press cake remaining after oil extraction is rich in proteins and has potential for use in animal feed, adding value to the productive chain of biodiesel. 16,17 However, the press cake contains toxic compounds, such as phorbol esters (PEs), 18 whi...

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Biofuel plant species and the contribution of genetic improvement

Cited by 24 publications

References 4 publications

Physiological changes in Jatropha curcas L. seeds during storage

Physiological changes in Jatropha curcas L. seeds during storage

Standard germination test in physic nut (Jatropha curcas L.) seeds

Multivariate Calibration to Determine Phorbol Esters in Seeds of Jatropha curcas L. Using Near Infrared and Ultraviolet Spectroscopies

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