Detection of Nitrogen Content in Rubber Leaves Using Near-Infrared (NIR) Spectroscopy with Correlation-Based Successive Projections Algorithm (SPA). | LitMetric
School of Mechanical and Electrical Engineering, Hainan University, Haikou, China.
Published: May 2018
AI Article Synopsis
Article Abstract
Near-infrared spectroscopy is an efficient, low-cost technology that has potential as an accurate method in detecting the nitrogen content of natural rubber leaves. Successive projections algorithm (SPA) is a widely used variable selection method for multivariate calibration, which uses projection operations to select a variable subset with minimum multi-collinearity. However, due to the fluctuation of correlation between variables, high collinearity may still exist in non-adjacent variables of subset obtained by basic SPA. Based on analysis to the correlation matrix of the spectra data, this paper proposed a correlation-based SPA (CB-SPA) to apply the successive projections algorithm in regions with consistent correlation. The result shows that CB-SPA can select variable subsets with more valuable variables and less multi-collinearity. Meanwhile, models established by the CB-SPA subset outperform basic SPA subsets in predicting nitrogen content in terms of both cross-validation and external prediction. Moreover, CB-SPA is assured to be more efficient, for the time cost in its selection procedure is one-twelfth that of the basic SPA.
The effect of ozone treatment on the sensory quality, aroma compounds, phytosterols, and phytosterol oxidation products (POP) in stored plant oils was studied. Cold-pressed flaxseed, cold-pressed rapeseed, and refined rapeseed oils were treated with ozone, air, and nitrogen, then subjected to accelerated storage at 60 °C for 6 days. The sensory evaluation revealed that ozone significantly influenced the sensory profile, with notable cucumber and green-grassy aromas.
Winter oilseed rape (WOSR, L.) is the third largest oil crop worldwide that also provides a source of high quality plant-based proteins. Nitrogen (N) and carbon (C) play a key role in plant growth.
The study assessed a developed food-safe on-package label as a real-time spoilage indicator for fish fillets. This colorimetric sensor is sensitive to Total Volatile Base Nitrogen (TVB-N) levels, providing a correct indication of fish freshness and spoilage. This study evaluates and predicts the shelf-life and effectiveness of an on-package colorimetric indicator.
Aims/background: Obesity is characterized by excessive body fat and is a chronic and complex disease. The medications used to date for the treatment of obesity have exhibited various side effects. Thus, new substances must be sought from alternative sources as anti-obesity drugs.
Inorganic Materials Research Laboratory, Department of Chemistry, Trent University, 1600 West Bank Dr., Peterborough, ON, Canada K9J 7B8. Electronic address:
2,4-dichlorophenoxy acetic acid (2,4-D) and 1,1-dimethyl-4,4-bipiridinium chloride (paraquat) are among the most widely used herbicides and are known to be toxic. Fabrication of green adsorbents which are capable of removing both herbicides remains a challenge. Here, we fabricate a novel adsorbent from tropical waste wood and use a facile, chitosan-mediated N-heteroatom functionalization technique to augment surface nitrogen and improve specific surface area.
