Physicochemical self-organizing phenomenon of starch with chemical substances

日本化学会 第96回(2016年3月) 春季年会 予稿集
(Fac. Life and Medical Sci., Doshisha Univ.) MATSUURA, Hirosato
Keywords: self-organization; starch; physical chemistry; physicochemical
Abstract: Amylose and amylopectin are co-located in starch, and its ratio is different depending on plant. We have found that it affects in the process of drying starch and generating cracks. Furthermore, we have observed a self-organization of starch in the following experiments using corn starch. We prepared dispersion of corn starch with glucose in water and allowed to air dry for 7 days at room temperature(23℃), then got results showed below. Glucose part gathered in the inner of dish that because glucose molecules tried to continue staying wet part during mixtures come to dry from the outside of dish. Also we found crack patterns are different as orthogonal cracks are in the outer part, and orthogonal cracks are in the inner part. The presence of chemicals make important role on the drying process and can control cracking.
 
デンプンと化学物質の混合における自己組織化
(同志社大 生命医) 松浦弘智
 
デンプンにはアミロースとアミロペクチンが共存しており,起源となる植物によってその割合が異なる.我々はデンプン分散液の乾燥亀裂に特徴的なパターンがあることを見出しているが,今回はコーンスターチ(fig.1)を用いた実験でデンプンと化学物質の混合物の乾燥過程における自己組織化について報告する.実験ではブドウ糖とコーンスターチの分散液を作成し,室温23℃で自然乾燥させ,7日間放置した.結果をfig.2に示す.デンプンは容器の外側から乾燥していき,水分がある部分にブドウ糖が残ろうとし,内側に糖が多い部分ができた.外側は直交亀裂,内側は斜交亀裂が多かった.化学物質の存在が乾燥過程に重要な役割をし,それらを制御できることがわかったため,発表ではこれらの現象について考察を交え述べたい.

denpun1
fig.1 Microscope image of corn-starch

denpun2
fig.2 Typical cracks after drying of corn-starch and glucose mixture

Matsuura, Hirosato "Physicochemical self-organizing phenomenon of starch with chemical substances", Chemistry Society Japan Abstract, March, 2016, URL: http://opennotebook.org/2015/03/27/physicochemical-self-organizing-phenomenon-of-starch-with-chemical-substances,
Archived at http://www.webcitation.org/query?id=1456835103334011 on March 1st, 2016.