Skip to main content
ARS Home » Research » Publications at this Location » Publication #82711
Title: GROWTH PERFORMANCE OF RATS FED JOJOBA PROTEINS. POSSIBLE CORRELATIONS WITHTRYPSIN INHIBITION IN JOJOBA PROTEINS.

Author
item FLO, G - INTERDISCIPLINARY RES CTR
item Abbott Dr, Thomas
item VERMAUT, S - KATHOLIEKE UNIV LEUVEN
item VAN BOVEN, M - KATHOLIEKE UNIV LEUVEN
item DAENENS, P - KATHOLIEKE UNIV LEUVEN
item DECUYPERE, E - KATHOLIEKE UNIV LEUVEN
item PEDERSEN, M - CAL POLY
item COKELAERE, M - INTERDISCIPLINARY RES CTR

Submitted to: Journal of Agricultural and Food Chemistry
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 7/17/1997
Publication Date: N/A
Citation: N/A

Interpretive Summary: Jojoba is a new crop being grown in the desert Southwestern U.S. The oil is being sold at good prices, but the seed meal is underutilized. Jojoba protein in the seed meal left after oil is removed seemed to be not as nutritious as soybean meal in feeding studies. Jojoba protein was fed to rats and digestive inhibition was found. This study showed that jojoba protein must be modified by heating in order to use it as feed for animals with one digestive cavity. This information will be used by processors and end-users of the meal who add it to feed formulations.

Technical Abstract: Defatted jojoba meal cannot be used as animal feed. The presence of simmondsins causes food intake inhibition and emaciation. A water soluble jojoba protein fraction can be separated from the low molecular weight fraction by ultrafiltration. We tested this jojoba protein fraction as a food supplement. During three weeks, rats were presented a semisynthetic basal diet containing 6% soy bean proteins as such: (C6) or supplemented either with 12% of soybean proteins (C18), 12% of jojoba proteins (JJ), 12% of toasted jojoba proteins (1 hr at 100 deg C) (JJT) or 12% of methanol extracted jojoba proteins (JJM). Three other groups of rats were pair fed, with a diet containing 18% soybean protein, to the JJ group (PFJJ), to the JJT group (PFJJT) and to the JJM group (PFJJM). Trypsin inhibitory activity was measured in all three preparations. Trypsin inhibitory activity was found in the jojoba protein fraction and could not be abolished by toasting or methanol extraction of the jojoba proteins. JJ and JJT rats showed a growth retardation compared to C18 and their respective pair feds; whereas growth of JJM rats was ameliorated and not different compared to the growth of their respective pair feds. Pancreases were hypertrophied in JJ, JJT and JJM rats. Brown adipose tissue was hypertrophied in JJ and JJT but was normal in JJM. The water soluble jojoba proteins obtained by ultrafiltration induce a marked pancreatic and brown adipose tissue hypertrophy and worse growth performances than soy protein fed rats. Brown adipose tissue hypertrophy can be avoided and growth retardation can be ameliorated by previous methanol extraction of the jojoba proteins.