期刊
FOOD CHEMISTRY
卷 385, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2022.132674
关键词
Bovine lactoferrin; Purity assessment; Isotope dilution mass spectrometry; Mass balance approach; Protein quantification
资金
- Agricultural Science and Technology Innovation Program
- Special Fund for Agro-scientific Research of the Ministry of Agriculture and Rural Affairs (MOARA) of China
This study presents a method for assessing the purity of bovine lactoferrin using mass balance method and amino acid-based isotope dilution mass spectrometry. The results obtained from the two methods showed good consistency, indicating the reliability of the analysis. These analytical methods can be applied in protein quantification and the development of certified reference materials for lactoferrin.
The accurate measurement of bovine lactoferrin (bLF) attracts wide attention in food and nutraceutical applications as its important physiological and nutritional functions. We present SI traceable procedures for assessing bLF purity using mass balance method and amino acid (AA)-based isotope dilution mass spectrometry (IDMS). The mass balance method was revealed with a purity of 0.938 +/- 0.011 g/g by deducting all aspects of impurities, including related structure impurities of 4.60%, ignition residue of 0.28%, Cl- of 1.10%, SO42- of 0.13%, and moisture of 0.17%. The AA-based IDMS quantitative result was 0.937 +/- 0.027 g/g. Hydrolysis conditions were optimized and methodology validation including, accuracy, precision, were studied. Good consistency was achieved between the two independent strategies and bLF purity assigned via the weighted mean value of their results was 0.938 +/- 0.015 g/g. These analyses are expected to be applicable to proteins quantification and development of LF certified reference materials.
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