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1. Introduction
Hull-less barley (Hordeum vulgare L. var. nudum Hook.), also
called Qingke in Chinese, is a kind of cultivated barley with naked
grains (Han et al., 2008). Hull-less barley is the main staple food
crop in Qinghai-Tibet Plateau. It is used as an essential food crop for
human consumption, as brewing material and as an important feed
source (Luan and He, 2004). Bran of hull-less barley, being
considered as waste in the area of Qinghai-Tibet Plateau, is often
produced as a by-product of milling in the production of refined
grains. In recent years, growing attention has been paid to hull-less
barley due to its specific attributes, such as high glucan content,
high dietary fibre content, high feeding value, and high malt quality
(Wang et al., 2010). Compared with other parts of hull-less barley,
bran has a relatively higher content of b-glucan (Zheng et al., 2011).
In clinical studies, the health benefits of b-glucans have been
verified in terms of reducing serum cholesterol levels and attenuating
postprandial blood glucose and insulin responses in a viscosity
related fashion (Skendi et al., 2003). Moreover, the specific
physical properties of b-glucan, such as water solubility, viscosity,
and gelation (Lazaridou et al., 2004), have made it a new food
resource (Sharma and Gujral, 2013). The soluble b-glucans from
other grains, such as oat and barley, are already widely used in food
and beverage products throughout the world. Apart from the
application of b-glucan in the food and pharmaceutical industry, bglucan
also has been applied in cosmetics (Du et al., 2013). b-Glucan
from oat is also well-known for its soothing, moisturizing and antiirritant
properties, and there are many cosmetic and personal care
products which benefit from its inclusion.
In terms of b-glucan extraction, a great variety of approaches
based on different principles have been developed. For instance,
alkaline extraction, acidic extraction, hot water extraction and
enzymatic method extraction have been applied to extract b-glucan
from barley (Ahmad et al., 2009). However, there is no report, to the
best of our knowledge, on b-glucan extraction with the help of an
accelerated solvent extraction (ASE) technique. ASE is a relatively
new automatic extraction technique, which uses high pressure.
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