Speaker
Dr
Bridget Ingham
(Callaghan Innovation)
Description
Most of the dietary calcium in milk is contained within casein micelles as so-called ‘colloidal calcium phosphate’ (CCP) nanoclusters around 2-3 nm in size. Small-angle X-ray and neutron scattering (SAXS and SANS) have been used for several decades to study the internal structure of bovine casein micelles, but there is lingering controversy over the interpretation of the scattering data [1].
Recent synchrotron scattering experiments have shed new light on this long-standing problem. Resonant soft X-ray scattering (RSoXS) of bovine milk at the Ca L2,3-edges using beamline 11.0.1.2 at the Advanced Light Source, Lawrence Berkeley National Laboratory conclusively identified features arising from the CCP particles [2]. These measurements were supported by experiments conducted using the SAXS beamline at the Australian Synchrotron where the milk chemistry was modified [3]. We have extended these techniques to investigate the mineral structures in iron-fortified milk, using SAXS, RSoXS (at both the Ca and Fe L2,3 edges) and anomalous SAXS (at the Fe K-edge). The results will be presented and the implications discussed in terms of developing new food ingredients; the benefits and challenges of the RSoXS and anomalous SAXS techniques will also be discussed.
[1] D. G. Dalgleish, Soft Matter 7 (2011) 2265.
[2] B. Ingham et al., Soft Matter 11 (2015) 2723-2725.
[3] B. Ingham et al., Soft Matter 12 (2016) 6937-6953.
| Do you wish to take part in</br>the Student Poster Slam? | No |
|---|---|
| Keywords or phrases (comma separated) | SAXS, anomalous SAXS, milk, element-specific, RSoXS, techniques |
| What is your gender? | Female |
| Are you a student? | No |
| Are you an ECR? (<5 yrs</br>since PhD/Masters) | No |
Primary author
Dr
Bridget Ingham
(Callaghan Innovation)
Co-authors
Alice Smialowska
(Massey University)
Dr
Alistair Carr
(Massey University)
Dr
Cheng Wang
(Berkeley National Laboratory)
Gad Erlangga
(Massey University)
Dr
Nigel Kirby
(Australian Synchrotron)
