Abstract

Near infrared (NIR) spectroscopy was used to examine leaf and bark samples from Mount Kenya Forest Reserve to investigate the feeding preferences of elephants. Systematic differences were observed in specific spectral regions between leaf material from preferred (Lasianthus kilimandscharica) and non-preferred (Bersama abyssinica) tree species, i.e. 1640–1750, 2000–2150, 2200–2250 and 2280–2400 nm. Differences between bark samples from preferred (Eucalyptus saligna) and non-preferred (Vitex keniensis) tree species were observed in the 1100–1200, 1300, 1640–1750 and 2250–2400 nm regions. Qualitative multivariate analysis of the spectral data using principal component and cluster analysis achieved complete separation of the preferred and non-preferred samples for both leaf and bark material. Interpretation of the spectral data was used as an aid to select which chemical analyses should be performed next. In addition to phenolic compounds, it is suggested that nitrogenous, carbohydrate and fibre fractions be examined.

© 1997 NIR Publications

Exploring in-vivo infrared spectroscopy for nail-based diabetes screening

Daniela Lazaro-Pacheco, Philip F Taday, and Päivi Maria Paldánius
Biomed. Opt. Express 15(3) 1926-1942 (2024)

Rapid identification of the variety of maize seeds based on near-infrared spectroscopy coupled with locally linear embedding

Shu Liu, Zhengguang Chen, and Feng Jiao
Appl. Opt. 61(7) 1704-1710 (2022)

Combination of near-infrared spectroscopy with Wasserstein generative adversarial networks for rapidly detecting raw material quality for formula products

Xiaowei Xin, Junhua Jia, Shunpeng Pang, Ruotong Hu, Huili Gong, Xiaoyan Gao, and Xiangqian Ding
Opt. Express 32(4) 5529-5549 (2024)

Rapid determination of the main components of corn based on near-infrared spectroscopy and a BiPLS-PCA-ELM model

Lili Xu, Jinming Liu, Chunqi Wang, Zhijiang Li, and Dongjie Zhang
Appl. Opt. 62(11) 2756-2765 (2023)

Mid-infrared near-field spectroscopy

Sergiu Amarie, Thomas Ganz, and Fritz Keilmann
Opt. Express 17(24) 21794-21801 (2009)