Near-Infrared Analysis of Peanut Seed Skins for Catechins


Peanuts (Arachis hypogea) produce several phenolic compounds such as catechins that may be isolated as co-products from peanut seed testae or skins during peanut processing. Peanut skins are currently underutilized although they are a potential source of bioactive compounds for use in functional foods and animal feeds. The phenolic compounds in the skins can degrade during processing and lose bioactivity. Extracted peanut skins were analyzed by near-infrared (NIR) spectroscopy to detect phenolic compounds. Spectra were collected from 10000 - 4000 cm﹣1 and evaluated by principal component analysis (PCA) to compare differences in peanut skins before and after alcohol extraction. PCA of derivative spectra showed clear separation into two groups. These results support the development of predictive models to measure catechins in blanched peanut skins.

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Holser, R. (2014) Near-Infrared Analysis of Peanut Seed Skins for Catechins. American Journal of Analytical Chemistry, 5, 378-383. doi: 10.4236/ajac.2014.56046.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] United States Department of Agriculture (2012) Peanuts: Acreage Planted, Harvested, Yield, Production, and Value.
[2] Sobolev, V.S. and Cole, R.J. (2003) Note on Utilisation of Peanut Seed Testa. Journal of the Science of Food and Agriculture, 84, 105-111.
[3] Lopes, R.M., Agostini-Costa, T., Gimenes, M.A. and Silveira, D. (2011) Chemical Composition and Biological Activities of Arachis Species. Journal of Agricultural and Food Chemistry, 59, 4321-4330.
[4] Baurhoo, B., Ruiz-Feria, C.A. and Zhao, X. (2008) Purified Lignin: Nutritional and Health Impacts on Farm Animals-A Review. Animal Feed Science and Technology, 144, 175-184.
[5] Jenkins, K.J., Collins, F.W. and Hidiroglou, M. (1992) Research Note: Efficacy of Various Flavonoids and Simple Phenolics in Prevention of Nutritional Myopathy in the Chick. Poultry Science, 71, 1577-1580.
[6] Zhang, D., Hu, H., Rao, Q. and Zhao, Z. (2011) Synergistic Effects and Physiological Responses of Selected Bacterial Isolates from Animal Feed to Four Natural Antimicrobials and Two Antibiotics. Foodborne Pathogens and Disease, 8, 1055-1062.
[7] Hoteling, H. (1933) Analysis of a Complex of Statistical Variables into Principal Components. Journal of Educational Psychology, 24, 417-441.
[8] Darton, R.A. (1980) Rotation in Factor Analysis. The Statistician, 29, 167-194.
[9] Insausti, M., Gomes, A.A., Cruz, F.V., Pistonesi, M.F., Araujo, M.C., Galvão, R.K., Pereira, C.F. and Band, B.S. (2012) Screening Analysis of Biodiesel Feedstock Using UV-vis, NIR and Synchronous Fluorescence Spectrometries and the Successive Projections Algorithm. Talanta, 97, 579-583.

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