Rapid Determination of Total Dietary Fiber and Minerals in Coix Seed by Near-Infrared Spectroscopy Technology Based on Variable Selection Methods

Abstract

The feasibility of near-infrared (NIR) spectroscopy for determining total dietary fiber (TDF) and mineral elements (mainly K, Mg, P, and S) in Coix seed was investigated. Partial least squares regression (PLSR) was applied to establish quantitative models. Norris derivative smoothing (NDS) was used as pretreatment method. A comparison of three variable selection methods, namely competitive adaptive reweighted sampling (CARS), genetic algorithms (GA), and random frog (RF), showed that CARS obtained the best performances of PLSR models with the effective wavelengths mainly concentrated on around 12,000-11,000 cm −1 and 6500-3600 cm −1 . For the quantitative determination models of TDF, K, Mg, P, and S, the optimal root mean square error of prediction (RMSEP) values were 0. 0923, 182.7224, 75.4987, 162.6993, and 36.6278; the r values were 0.95, 0.88, 0.80, 0.96, and 0.96; the residual predictive deviation (RPD) values were 2.68, 2.05, 1.70, 3.24, and 3.04, respectively. It is concluded that the NIR spectral technique has a potential to determine TDF, K, Mg, P, and S in Coix seed.

Changes of the phenolic compounds and antioxidant activities in germinated adlay seeds

“…It is an annual plant, distributed throughout China, Thailand and Japan. Adlay is rich in protein, oil and a full range of amino acids . Moreover, adlay is also the source of many bioactive compounds, including phenolics, coixol, coixenolide and bioactive peptides .…”

“…Adlay is rich in protein, oil and a full range of amino acids. 2 Moreover, adlay is also the source of many bioactive compounds, including phenolics, coixol, coixenolide and bioactive peptides. 3 Potential health benefits associated with consuming adlay have been well documented, notably the pharmacological and physiological effects such as anti-inflammation, 4 anti-cancer and analgesic effects.…”

Rapid determination of 15 metallic elements in 2 kinds of coix seeds by inductively coupled plasma‐mass spectrometry after closed‐vessel microwave digestion

“…Coix seeds could be divided into two types (bigger coix seed and smaller coix seed) from the shape, and have significant difference in the price. Nevertheless, there are less researches and literatures on the nutritional ingredients in this two kinds of coix seeds (Liu et al, ; Liu, Qin, & Xie, ), especially the content of metal elements. There are many methods for detection of mineral elements, heavy metals, and nonmetal, including atomic absorption spectroscopy (AAS), inductively coupled plasma optical emission spectrometry (ICP‐OES), inductively coupled plasma‐mass spectrometry (ICP‐MS), atomic fluorescence spectroscopy (AFS), electrochemistry (EC).…”

Quantitative assessment of wheat quality using near‐infrared spectroscopy: A comprehensive review

“…For flour, assessments usually focus on processing, storage, dough making, and end product quality properties. Therefore, the related parameters usually include starch content, ash content, protein content, lipid content, moisture, rheological properties, bioactive compounds, and baking performance (Dong & Sun, 2013; Ferreira et al., 2015; Finney et al., 1988; Garnsworthy et al., 2000;Li et al., 2017; Liu et al., 2015; Miralbés, 2004; Morgan & Williams, 1995; Mutlu et al., 2011; Owens et al., 2009; Shi et al., 2019). Recently, researchers explored spectra from single kernel or bulk samples, and some advances were also made in parameter prediction that was previously studied for early screening (Arazuri et al., 2012; Gabriel et al., 2017; Mishra et al., 2018; Mutlu et al., 2011; Peiris et al., 2017; Shi & Yu, 2017; Sinelli et al., 2011).…”