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Chemical characteristics and mineral composition of quinoa by near‐infrared spectroscopy
Author(s) -
González Martín M Inmaculada,
Wells Moncada Guillermo,
Fischer Susana,
Escuredo Olga
Publication year - 2013
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.6325
Subject(s) - chemical composition , mineral , infrared spectroscopy , composition (language) , infrared , spectroscopy , chemistry , environmental chemistry , mineralogy , food science , organic chemistry , optics , physics , philosophy , linguistics , quantum mechanics
BACKGROUND Quinoa ( Chenopodium quinoa Willd.) has been traditionally used as a foodstuff in the Andes and it has gained increasing interest in recent years owing to its high nutritional value. The potential of near‐infrared spectroscopy ( NIRS ) for estimating chemical compounds in quinoa was studied because of the possibility of conducting direct measurement without prior sample treatment . RESULTS The use of NIRS technology with a remote reflectance fiber‐optic probe for the analysis of major compounds and mineral composition of 48 quinoa samples was studied. The calibration of the NIRS instrument was conducted using modified partial least squares ( MPLS ) analysis. This allowed the determination of protein (16.0–20.2 g 100g −1 ), crude fiber (1.8–3.1 g 100g −1 ), fat (4.4–7.5 g 100g −1 ), calcium (298.8–1164.5 mg kg −1 ), iron (0–948.5 mg kg −1 ) and phosphorus (2735.0–4543.3 mg kg −1 ). The correlation coefficients ( RSQ ) were 0.83 for protein, 0.73 for crude fiber, 0.93 for fat; 0.60 for calcium; 0.76 for iron and 0.75 for phosphorus. The robustness of the equations obtained was verified by external validation on unknown quinoa samples . CONCLUSIONS NIRS with fiber‐optic probe provides an alternative for the determination of chemical compounds of quinoa, faster and at lower cost, with results comparable with chemical methods. © 2013 Society of Chemical Industry