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<blockquote data-quote="Dave Black" data-source="post: 1749" data-attributes="member: 200"><p>[USER=44]@NickWallingford[/USER] Good Grief!</p><p></p><p>…you mentioned the ‘L’ word. And the ‘D’word.</p><p></p><p>People fructose and glucose are the same compounds chemically, but the elements are arranged differently in space. They are ‘optical isomers’. When you shine a light through them because of this different physical property they interfere with the light and bend it in different directions. Fructose bends it to the left (anticlockwise); glucose bends it to the right (clockwise). North America uses the term <strong>levulose</strong> (‘left’ sugar) and <strong>dextrose</strong> (‘right’ sugar), uncharacteristically using Latin to form the words. It could be more confusing but we’ll stop there.</p><p></p><p>An interesting side note perhaps. The strength of this effect is greater for fructose then it is for glucose, so if you have a solution with equal quantities of each polarised light is turned left-ish. Sucrose also has some optical activity, and bends light to the right (clockwise). When you take sucrose and hydrolise it (chemically add water to make fructose and glucose) the solution goes from turning light to the right, to turning it left - it ‘inverts’.</p><p></p><p>Hence ‘invert’ sugar.</p></blockquote><p></p>
[QUOTE="Dave Black, post: 1749, member: 200"] [USER=44]@NickWallingford[/USER] Good Grief! …you mentioned the ‘L’ word. And the ‘D’word. People fructose and glucose are the same compounds chemically, but the elements are arranged differently in space. They are ‘optical isomers’. When you shine a light through them because of this different physical property they interfere with the light and bend it in different directions. Fructose bends it to the left (anticlockwise); glucose bends it to the right (clockwise). North America uses the term [B]levulose[/B] (‘left’ sugar) and [B]dextrose[/B] (‘right’ sugar), uncharacteristically using Latin to form the words. It could be more confusing but we’ll stop there. An interesting side note perhaps. The strength of this effect is greater for fructose then it is for glucose, so if you have a solution with equal quantities of each polarised light is turned left-ish. Sucrose also has some optical activity, and bends light to the right (clockwise). When you take sucrose and hydrolise it (chemically add water to make fructose and glucose) the solution goes from turning light to the right, to turning it left - it ‘inverts’. Hence ‘invert’ sugar. [/QUOTE]
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