Infrared attenuated total reflection spectroscopic analysis and quantitative detection of forage spectral features in ruminant systems
| Autor: | Xuewei Zhang, Victor H. Guevara-Oquendo, Ganqi Deng, Peiqiang Yu, X. Yan, Huihua Zhang, Cuiying Ji |
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| Rok vydání: | 2020 |
| Předmět: |
Rumen
Spectrophotometry Infrared Analytical chemistry Forage 02 engineering and technology 010402 general chemistry 01 natural sciences Analytical Chemistry Chemometrics chemistry.chemical_compound Protein structure Amide Animals Molecule Fourier transform infrared spectroscopy Spectroscopy Instrumentation Chemistry Ruminants 021001 nanoscience & nanotechnology Animal Feed Atomic and Molecular Physics and Optics 0104 chemical sciences Intestines Dairying Kinetics Milk Attenuated total reflection Cattle Dietary Proteins 0210 nano-technology |
| Zdroj: | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. 228:117630 |
| ISSN: | 1386-1425 |
| DOI: | 10.1016/j.saa.2019.117630 |
| Popis: | This study aimed to (1) access protein molecular structure profile and metabolic characteristics of model forages [Foreign sourced-origin (coded as: "FSO", n = 7 vs. Chinese sourced-origin alfalfa hay "CSO", n = 5] in ruminant systems; (2) Quantify the relationship between forage protein molecular structures and protein utilization and availability. Advanced non-invasive vibrational molecular spectroscopic technique (ATR-FTIR: Attenuated Total Reflection Fourier Transform Infrared spectroscopy) with chemometrics was applied to reveal forage protein molecular structure. Both univariate and multivariate molecular spectral analyses were applied to study molecular structure features in model forages. The molecular structure study provided the detailed protein structure profiles of Amide I and Amide II areas and height, total Amide I and II area ratios, Amide I to II height ratio as well as Amide I to II area ratio using ATR-FTIR spectroscopy. The results showed FSO and CSO had similar (P 0.05) protein rumen degradation kinetics. However, FSO had superior quality than CSO in intestinal (IDP) and total digestible protein (TDP) and truly absorbed nutrient supply (P 0.05). As intestinal digestion of protein, FSO was higher (P 0.05) in protein digestion in terms of: intestinal digestibility of rumen undegraded protein (dIDP: 47.5 vs. 38.3 %RUP); Intestinal digestible protein (IDP: 17.6 vs. 13.7 %CP). As truly absorbed nutrient supply, FSO contained higher (P 0.05) truly absorbed rumen synthesized microbial protein, absorbable rumen undegradable feed protein in the small intestine, total truly digested protein in the small intestine, metabolizable protein and Feed Milk Value (FMV |
| Databáze: | OpenAIRE |
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