Bioetanol Y Biodiesel

Food Chemistry
Food Chemistry 96 (2006) 80–89 www.elsevier.com/locate/foodchem

Chemical composition, toxic/antimetabolic constituents, and effects of different treatments on their levels, in four provenances of Jatropha curcas L. from Mexico
´ ´ ´ J. Martınez-Herrera a, P. Siddhuraju b, G. Francis b, G. Davila-Ortız a, K. Becker
a

b,*

´ ´ Departamento de Graduados e Investigacion enAlimentos, Escuela Nacional de Ciencias Biologicas, IPN. ZIP 11340, Mexico D.F., Mexico b Department of Aquaculture Systems and Animal Nutrition, Institute for Animal Production in the Tropics and Subtropics, University of Hohenheim (480), D-70593 Stuttgart, Germany Received 25 October 2004; received in revised form 27 January 2005; accepted 27 January 2005

Abstract Jatropha curcas L. is amultipurpose shrub of significant economic importance because of its several potential industrial and medicinal uses. Four provenances of J. curcas from different agro-climatic regions of Mexico (1. Castillo de Teayo, 2. Pueblillo 3. Coatzacoalcos and 4. Yautepec), that differed in morphological characteristics, were studied. The seed kernels were rich in crude protein, CP (31–34.5%) and lipid (55–58%). Theneutral detergent fibre contents of extracted J. curcas meals were between 3.9% and 4.5% of dry matter (DM). The gross energy of kernels ranged from 31.1 to 31.6 MJ/kg DM. The contents of starch and total soluble sugars were below 6%. The levels of essential amino acids, except lysine, were higher than that of the FAO/WHO reference protein for a five year old child in all the meal samples on a drymatter basis. The major fatty acids found in the oil samples were oleic (41.5– 48.8%), linoleic (34.6–44.4%), palmitic (10.5–13.0%) and stearic (2.3–2.8%) acids. We also found previously unreported cis-11-eicosenoic acid (C20:1) and cis-11,14-eicosadienoic acid (C20:2) in the oil. Phorbolesters were present in high concentrations in the kernels of Coatzacoalcos (3.85 mg/g dry meal), but were notdetected in the samples from Castillo de Teayo, Pueblillo and Yautepec. Trypsin inhibitors (33.1–36.4 mg trypsin inhibited gÀ1 dry meal), phytates (8.5–9.3% of dry meal as phytic acid equivalent), saponins (2.1–2.9% of dry meal) and lectins (0.35–1.46 mg/ml of the minimum amount of the sample required to show the agglutination) were the other major antinutrients present in all the seed meals.Different treatments were attempted on the seed meal samples to neutralize the antinutrients present in them. Trypsin inhibitors were easily inactivated with moist heating at 121 °C for 25 min. Phytate levels were slightly decreased by irradiation at 10 kGy. Measured saponin contents were reduced by ethanol extraction and irradiation. Extraction with ethanol, followed by treatment with 0.07% NaHCO3considerably decreased lectin activity. The same treatment also decreased the phorbolester content by 97.9% in seeds from Coatzacoalcos. The in vitro digestibility of defatted meal (DM) was between 78.6% and 80.6%. It increased to about 86% on heat treatment. Ó 2005 Elsevier Ltd. All rights reserved.
Keywords: Jatropha curcas; Composition; Antinutrients; Detoxification

1. Introduction Jatropha curcas(physic nut or purging nut) is a drought-resistant shrub or tree belonging to the Family
*

Corresponding author. Tel./fax: +49 711 459 3702. E-mail address: kbecker@uni-hohenheim.de (K. Becker).

Euphorbiaceae, which is cultivated in Central and South America, south-east Asia, India and Africa (Schmook & Seralta-Peraza, 1997). The J. curcas plant, which can easily be propagated by cuttings,is widely planted as a hedge to protect fields, as it is not browsed by cattle or other animals. Like many other Jatropha species, J. curcas is a succulent that sheds its leaves during the

0308-8146/$ - see front matter Ó 2005 Elsevier Ltd. All rights reserved. doi:10.1016/j.foodchem.2005.01.059

´ J. Martınez-Herrera et al. / Food Chemistry 96 (2006) 80–89

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