TAHIL VE PSEUDO-TAHILLARIN ISLAK ÖĞÜTME TEKNOLOJİSİ

Year 2021, Volume: 46 Issue: 2, 463 - 473, 23.03.2021

Erkan Yalçın , Ayşenur Arslan

https://doi.org/10.15237/gida.GD20147

Abstract

Öğütmenin amacı; tohumu meydana getiren başlıca kısımları, öğütme yöntemine göre ayırarak, gıda endüstrisi veya diğer endüstrilerde kullanmaktır. Öğütme, genel olarak kuru ve ıslak öğütme olarak sınıflandırılabilir. Islak öğütmede amaç; nişasta, protein, besinsel lif ve ham yağ gibi tohumun başlıca kimyasal bileşenlerini ayırmak iken; kuru öğütmede amaç tanenin anatomik kısımları olan endosperm, ruşeym ve kepeği ayırmaktır. Islak öğütmede her bileşen mümkün olan en saf haliyle ayrılırken; kuru öğütmede, yüksek kalitede rafine veya tam tane unu elde edilir. Islak öğütme, tahıl veya pseudo-tahılların temel bileşenlerini fiziksel, kimyasal, biyokimyasal ve mekanik işlemler ile ayıran endüstriyel bir işlemdir. Islak öğütme, ıslatma işlemi ile başlar, ardından mekanik ayırma işlemi gelir. Islak öğütme işlemi sanayide, çoğunlukla buğday ve mısıra uygulanırken, sorgum, arpa, yulaf ve pirinç gibi tahıllara da uygulanmaktadır. Karabuğday, kinoa ve amarant pseudo-tahıllarının ıslak öğütmesi ile ilgili çalışmalar henüz laboratuvar ölçeğindedir. Tahıl veya pseudo-tahılların ıslak öğütme koşulları tamamen nişasta verimini ve fizikokimyasal özelliklerini etkilemektedir.

Keywords

Islak öğütme, tahıl, pseudotahıl, nişasta, protein, besinsel lif

WET MILLING TECHNOLOGY OF CEREAL AND PSEUDOCEREALS

Abstract

The purpose of the milling is to separate the main fractions of the grain due to milling method and is to use them for food or other industries. The milling can be classified as dry and wet milling. The purpose of the wet milling is to separate the main chemical constituents of the grain, such as starch, protein, dietary fibre and crude oil; the purpose of the dry milling is to separate the endosperm, germ and bran parts of the grain. All constituents can be separated with the highest purity in the wet milling; on the contrary the principle of the dry milling is to obtain the refine or wholegrain flour with the highest quality. The wet milling, which is an industrial process, separates the essential fractions of cereal or pseudo-cereals using physical, chemical, biochemical and mechanical processes. The wet milling starts with steeping process, and then the grain constituents are separated with mechanic splitting. The wet milling process is mostly applied to wheat and corn, besides it is also employed for some cereals like sorghum, barley, oat and rice. The wet milling of pseudo-cereals such as buckwheat, quinoa and amaranth is still carried out in a laboratory scale. The wet milling conditions of cereal/pseudo-cereals completely affect the starch yield and its physicochemical properties.

Keywords

Wet milling, cereal, pseudocereal, starch, protein, dietary fiber

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