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Fructose: Invert Sugar Separated with Lime as Calcium Laevulosate

작성자

Charlie

19. 10월 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.

중급

1–2 days

안내

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.

이 단계의 재료:

백설탕1 개

필요한 도구:

묽은 황산

증류수

큰 솥

전열판(핫플레이트)

화학물질 비산 보안경

고무장갑

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.

필요한 도구:

산화바륨

pH 지시약 종이

자루 달린 유리 깔때기

여과지

접시 저울

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.

이 단계의 재료:

소석회6 g per 100 ml

필요한 도구:

내열 유리 비커

잔 얼음

실험용 온도계

Filter and press

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

필요한 도구:

리넨 원단

직물용 나사 압착기

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.

필요한 도구: