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KMID : 1134820130420071115
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Journal of the Korean Society of Food Science and Nutrition
2013 Volume.42 No. 7 p.1115 ~ p.1124
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Physicochemical Properties and Microbial Analysis of Korean Solar Salt and Flower of Salt
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Lee Hye-Mi
Lee Woo-Kyoung
Jin Jung-Hyun
Kim In Cheol
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Abstract
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The present study was conducted to ensure the diversity of domestic solar salt by analyzing the composition and microbiological characteristics of solar salt (from Docho island: DS) and the flower of salt produced in different Korean salt flats (Sinui island: SF, Bigum island: BF, and Docho island: DF). The analyses showed that the moisture content of the three types of flower of salt and solar salt ranged from 10.54～13.82% and NaCl content ranged from 78.81～84.61%. The mineral content of those salts ranged from 3.57～5.51%. The content of insoluble matter in these salts was 0.01±0.00～0.05±0.00%. The sand content of these salts was 0.01±0.01～0.03±0.01%. By Hunter’s color value analysis, the color of the flower of salt was brighter and whiter than solar salt. The salinity of the flower of salt was a little higher than solar salt as well. The magnesium and potassium ion content of DF was 9,886.72±104.78 mg/kg and 2,975.23±79.73 mg/kg, respectively, which was lower than the content in SF, BF, and DS. The heavy metal content of all salts was acceptable under the Korean Food Sanitation Law. The flower of salt was confirmed to be sweeter and preferable to solar salt. More than 80% of the solar salt crystals were 2～3 mm in size, whereas crystals from the flower of salt were 0.5～2 mm in size. The bacterial diversity of DF and DS were investigated by culture and denaturing gradient gel electrophoresis (DGGE) methods. The number of cultured bacteria in flower of salt was approximately three times more than solar salt. By DGGE analysis, major microbes of DF were Maritimibacter sp., Cupriavidus sp., and unculturable bacteria, and those of DS were Cupriavidus sp., Dunalidella salina and unculturable bacteria. The results of DGGE analysis showed that major microorganisms in solar salts were composed of unidentified and unculturable bacteria and only a few microorganisms were culturable.
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KEYWORD
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solar salt, flower of salt, DGGE, halophilic bacteria
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