Does anybody have any ideas about water binding capacity and water holding capacity? Are there any differences between water binding capacity and water holding capacity? And how to measure them?
Water binding capacity is the tendency of water to associate with hydrophilic substances whereas Water holding capacity is the ability of a matrix of molecules to entrap large amounts of water in a manner such that exudation is prevented. Bound water exists in the vicinity of solutes and other non-aqueous constituents, exhibit reduced mobility and properties differing significantly from “bulk water” in the same system and does not freeze at -40°C.
Indeed, Water binding capacity is the tendency of water to associate with hydrophilic substances whereas Water holding capacity is the ability of a matrix of molecules to entrap certain amounts of water
WHC or WBC is really an ill-defined concept. Method varies from material to material. Centrifugation technique is the most common ( and there is no agreement on which speed you want to use). Obviously, for higher speed, your material will loose more water and vice versa. We have a publication on the hydratin properties of vegetable, which addresses some aspects of it. Here is the link:
it depends on the food you referring to, in meat it is referred to as WHC, you will probably find papers produced by working groups establishing what the "meat-community" understands as WHC, and methods used; Meat Science might be a good journal to look that up; when I had the same question some years ago binding was more used by american authors, or influenced by american english; I can give further help on this; maybe you should try and find work by, e.g., Gerald Offer, Bendal, Honikel, and so on, and OECD methodology, and other organizations
I have been recently requested to explain the importance and values of water binding capacity in by-pass fats (lipids for ruminants nutrition). Do you have any information on this? I would appreciate it very much.
Water binding capacity implies the ability of a material to take in water due to its hydrophilic nature; while Water holding capacity has to do with the amount of water that can be bound in a material without the influence of external forces.
Water-holding capacity (WHC): The ability of the meat to retain the tissue water present within its structure. and Water-binding capacity (WBC): The ability of the meat to bind added water.
Water absorbed is held and bound by the material to give water holding capacity.
Water in the material after absorption = free water + bound water
Free water is physcially embedded water in channels/ lumen and pores
Bound water is water bound by intermoelcular interactions and less mobile as free water
Water holding Capacity is water held upto saturation
Water binding Capacity is water held by the material after subjecting the material to external forces
So concerning the ratio of free water: bound water, WHC would mean that the material has more free water than its WBC and WBC obviously would mean that the material has more bound water than free water. The proportion of bound water:free water here in WBC will vary depending on the process shear, temperature and time conditions. It can be less likely that processes can increase WBC though increase in bound water via ionic interactions for example.