Abstract
Near infrared (NIR) spectroscopy has been used to determine total phosphorus (total-P), phytate, and phytate-bound phosphorus concentrations in grains and animal feeds. However, since more than 50% of the total-P in grains of most cultivated cereals occurs as phytate ( myo -inositolhexakisphosphate), there is a strong linear correlation between total-P and phytate-bound-P. If near infrared spectroscopy is used to analyse cereal products simultaneously for both total-P and for phytate-bound-P there is a risk that the intercorrelation effects will be dominant in models for each. This paper presents NIR spectra of whole wheat grains from progeny of a normal and a low phytate parent genotype. For these progeny there was a weak correlation between the phytate-bound-P and total-P concentrations (r = 0.5) and no correlation with grain protein (r = 0.1). The spectra of grains with lower phytate-bound-P differed at wavelengths that aligned mainly with O-H, C-H and P-OH bonds and included 7124 cm −1 (1404 nm), 5882 cm −1 (1701 nm) and 5245 cm −1 (1907 nm). Loading weights for partial least squares regression models indicated that models for both total-P and phytate-bound-P utilized essentially the same wavelengths. This supports the hypothesis that NIR calibrations for total-P and phytate-bound-P in wheat and wheat-based feeds are inter-dependent. This may not be critical for the determination of P in grain of most current genotypes due to the strong linear correlation between total-P and phytate-bound-P. However, to ensure more accurate analysis of P in grains of cereal varieties that carry genes for low phytate NIR calibration models for total-P, phytate-bound-P and phytate should be updated.
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Claims 6
Claim · model-written summary
Phytate-bound phosphorus and total phosphorus were weakly correlated at r = 0.5 in the progeny.
- Taxon
- wheat
Triticum aestivumt0 - Material
- progenye0
- Outcome
- phytate-bound-P and total-P concentrationse0
- Value
- r = 0.5e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For these progeny there was a weak correlation between the phytate-bound-P and total-P concentrations (r = 0.5) and no correlation with grain protein (r = 0.1).”
t0“wheat grains”
Claim · model-written summary
Phytate-bound phosphorus had no correlation with grain protein at r = 0.1.
- Taxon
- wheatTriticum aestivumt0
- Material
- progenye0
- Outcome
- phytate-bound-Pe0
- Value
- r = 0.1e0
- Comparator
- grain proteine0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For these progeny there was a weak correlation between the phytate-bound-P and total-P concentrations (r = 0.5) and no correlation with grain protein (r = 0.1).”
t0“wheat grains”
Claim · model-written summary
Lower phytate-bound phosphorus grains had spectral differences at specified bond-aligned wavelengths.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- spectrae0
- Value
- 7124 cm −1 (1404 nm)e0
- Qualifier
- lower phytate-bound-Pe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The spectra of grains with lower phytate-bound-P differed at wavelengths that aligned mainly with O-H, C-H and P-OH bonds and included 7124 cm −1 (1404 nm), 5882 cm −1 (1701 nm) and 5245 cm −1 (1907 nm).”
t0“wheat grains”
Claim · model-written summary
NIR model loadings used essentially the same wavelengths for total and phytate-bound phosphorus.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- utilized essentially the same wavelengthse0
- Comparator
- models for both total-P and phytate-bound-Pe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Loading weights for partial least squares regression models indicated that models for both total-P and phytate-bound-P utilized essentially the same wavelengths.”
t0“wheat grains”
Claim · model-written summary
NIR calibrations for total and phytate-bound phosphorus were interpreted as interdependent.
- Taxon
- wheatTriticum aestivume0
- Outcome
- NIR calibrations for total-P and phytate-bound-Pe0
- Qualifier
- inter-dependente0
- Comparator
- total-P and phytate-bound-Pe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This supports the hypothesis that NIR calibrations for total-P and phytate-bound-P in wheat and wheat-based feeds are inter-dependent.”
Claim · model-written summary
The authors recommend updating NIR calibrations for low-phytate cereal grain varieties.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- NIR calibration models for total-P, phytate-bound-P and phytate should be updatede0
- Qualifier
- cereal varieties that carry genes for low phytatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“to ensure more accurate analysis of P in grains of cereal varieties that carry genes for low phytate NIR calibration models for total-P, phytate-bound-P and phytate should be updated.”
t0“wheat grains”