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Fructose: Invert Sugar Separated with Lime as Calcium Laevulosate

作成者

Charlie

19. 10月 2026

Fructose: Invert Sugar Separated with Lime as Calcium Laevulosate

Fructose (laevulose) is the fruit sugar; ordinary sugar is fructose and glucose joined. Thorpe's Dictionary (1912) separates them: invert the sugar with acid, then stir lime into the ice-cold solution. The fructose comes down as calcium laevulosate, which hardly dissolves in ice water, while the glucose stays in solution. Carbon dioxide then frees the fructose. It melts at 95 °C and is sweeter than ordinary sugar. The picture: our diagram.

中級者

1–2 days

手順

Invert the sugar

Warm a sugar solution with a little mineral acid to split it into glucose and fructose (invert sugar). Ours: dilute sulphuric acid, as required.

このステップの材料:

上白糖（グラニュー糖）1 個

必要な工具:

希硫酸

蒸留水

大型ステンレス鍋

ホットプレート

化学薬品飛沫用ゴーグル

ゴム手袋

Remove the acid with baryta

Neutralise the acid with baryta (ours: barium oxide) and filter off the barium sulphate. Make the invert sugar up to a 10 % solution.

必要な工具:

酸化バリウム

pH 指示薬紙

脚付きガラス漏斗

ろ紙

天秤ばかり

Lime it ice-cold

Ice-cold, add 6 g finely powdered slaked lime to every 100 cc and stir, with the vessel standing in ice water, until the milky liquid turns creamy. The fructose comes down as calcium laevulosate; the glucose stays dissolved.

このステップの材料:

消石灰6 g per 100 ml

必要な工具:

耐熱ガラスビーカー

砕いた氷

実験用温度計

Filter and press

Filter through linen and press hard to get rid of most of the liquid.

必要な工具:

リネン生地

布用ねじ式プレス

Free the fructose with carbon dioxide

Suspend the pressed mass in water and pass in carbon dioxide. Filter, then evaporate the solution under vacuum over sulphuric acid: anhydrous fructose remains.

必要な工具: