Determination of methyl cellulose in canned mandalin oranges.

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  • みかんかん詰中のメチルセルロースの定量
  • ミカン カンズメチュウ ノ メチルセルロース ノ テイリョウ

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A determination method of methyl cellulose (MC) from canned mandalin oranges was developed by using semimicro Zeisel apparatus and gas chromatography. MC was extracted from 25g of sample with water and the solution was dialyzed against water for 2 hours. The inner solution was evapolated to 3 ml, and passed through the gel permeation chromatographic column (Toyopearl HW-60F, 1.5×30cm) by water in order to remove the low molecular weight substances which have the methoxyl groups. The fraction containing MC was condensed to 1 ml and transfered into semimicro Zeisel apparatus to decompose of MC. The methyl iodide caught in ethyl acetate was determined by gas chromatography equipped with a flame ionization detecter. The recovery of MC at the level of 0.1% was 86%. MC contents in eleven samples of commercial canned mandalin oranges was determined, three samples in which contained 0.0008-0.0015%.

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