Download e-book for kindle: An Introduction to the Physical Chemistry of Food by John N. Coupland (auth.)

By John N. Coupland (auth.)

ISBN-10: 1493907603

ISBN-13: 9781493907601

ISBN-10: 1493907611

ISBN-13: 9781493907618

Familiar combos of constituents and processing make the constructions that supply meals its houses. for instance in ice cream, the emulsifiers and proteins stabilize partially crystalline milk fats as an emulsion, freezing (crystallization) of a few of the water offers the product its hardness and polysaccharide stabilizers maintain it delicate. Why diverse recipes paintings as they do is basically ruled by means of the principles of actual chemistry.

This textbook introduces the actual chemistry necessary to realizing the habit of meals. beginning with the easiest version of molecules attracting and repelling each other whereas being moved by means of the randomizing impact of warmth, the legislation of thermodynamics are used to derive vital homes of meals comparable to taste binding and water job. so much meals comprise a number of levels and an identical molecular version is used to appreciate part diagrams, section separation and the houses of surfaces. the remainder chapters specialise in the formation and homes of particular constructions in meals – crystals, polymers, dispersions and gels.

Only a simple realizing of nutrition technology is required, and no arithmetic or chemistry past the introductory university classes is needed. in any respect phases, examples from the first literature are used to demonstrate the textual content and to spotlight the sensible purposes of actual chemistry in nutrition science.

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Example text

3 Single, double, and triple bonds structures as illustrated by a ethane, b ethene, and c ethyne. Some of the hydrogens are labeled as R-groups to illustrate the changes in conformation due to rotation about the carbon–car- bon bond. The single bonds in ethane are free to rotate, profoundly changing the shape of the molecule (shown as a 2D projection in b). An energy barrier restricts rotation about double bonds distribution skewed and the bond polarized. The atom with the greater share of the bonding electrons accumulates a fractional negative charge ( δ −) leaving the other atom with a slight positive charge ( δ +).

The magnitude of the force is less than the corresponding ion–dipole interaction because while one end of the dipole feels a net attraction, the other feels a net repulsion. However, in the liquid state molecules are free to move so their orientations are not fixed. If the molecules were completely free to rotate, the attractive and repulsive orientations would cancel one another out and the net dipole–dipole interaction would be zero. However, the attractive orientations are preferred to the repulsive ones and polar molecules in solution will tend to line up next to one another and provide a weak attractive force, the Keesom force.

A bond is when the orbitals from two atoms combine to form a molecular orbital with the pair of electrons distributed between the atoms. The properties of the bonding orbitals for simple molecules can, in principle, be calculated using quantum mechanics but here it will suffice to take a simple approach and merely note some of the important features of covalent bonds. • Fixed Valency. , the valency) governed by the number of electrons needed to fill the outer electronic shell. Thus, hydrogen with one electron needs a second to fill its first-level orbital and achieves this by forming one bond, helium has two electrons so its first level orbital is already full and tends not to form bonds.

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An Introduction to the Physical Chemistry of Food by John N. Coupland (auth.)


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