Separation of Flavonoids and Salt in Bean Cake Disposed from Soy Sauce Manufacturing Process

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Soy sauce cakes contain about 5–10 wt% salt; therefore, incineration results in corrosion of the furnace and environmental problems related to, for example, dioxin generation. However, amino and organic acids, and soybean isoflavone, as well as a number of other useful components remain in the soy sauce cakes. The amount of desalination with water was 590 mg/10 g-feed, while that with methanol was about 70% of this value. Desalination could not be performed successfully with acetone or n-hexane. The amounts of flavonoid in the form of daidzein and genistein extracted from 10 g of soy sauce cake were 3.4–7.2 and 7.2–11.0 mg, respectively, while extraction with water was minimal. Moreover, the amount of flavonoids extracted increased while the amount of desalination decreased with aqueous alcohol solutions. The dual cylinder solid–liquid extractor presented here for separation of flavonoids and salt from soy sauce cakes was able to collect 10.2 mg/50 g-feed of daidzein and 18.8 mg/50 g-feed of genistein. The length of time the sample is retained in the mixer can be varied by changing the agitation speed, the number of baffle plates and the diameter of the mixer cylinder outlet. This solid–liquid extractor is therefore applicable in a wide range of food waste recycling processes.http://ci.nii.ac.jp/naid/10018182881

Soy sauce cakes contain about 5–10 wt% salt; therefore, incineration results in corrosion of the furnace and environmental problems related to, for example, dioxin generation. However, amino and organic acids, and soybean isoflavone, as well as a number of other useful components remain in the soy sauce cakes. The amount of desalination with water was 590 mg/10 g-feed, while that with methanol was about 70% of this value. Desalination could not be performed successfully with acetone or <I>n</I>-hexane. The amounts of flavonoid in the form of daidzein and genistein extracted from 10 g of soy sauce cake were 3.4–7.2 and 7.2–11.0 mg, respectively, while extraction with water was minimal. Moreover, the amount of flavonoids extracted increased while the amount of desalination decreased with aqueous alcohol solutions. The dual cylinder solid–liquid extractor presented here for separation of flavonoids and salt from soy sauce cakes was able to collect 10.2 mg/50 g-feed of daidzein and 18.8 mg/50 g-feed of genistein. The length of time the sample is retained in the mixer can be varied by changing the agitation speed, the number of baffle plates and the diameter of the mixer cylinder outlet. This solid–liquid extractor is therefore applicable in a wide range of food waste recycling processes.

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  • Journal of chemical engineering of Japan  

    Journal of chemical engineering of Japan 39(7), 777-782, 2006-07-01 

    社団法人 化学工学会

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各種コード

  • NII論文ID(NAID)
    10018182881
  • NII書誌ID(NCID)
    AA00709658
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00219592
  • NDL 記事登録ID
    7987494
  • NDL 雑誌分類
    ZP1(科学技術--化学・化学工業)
  • NDL 請求記号
    Z53-R395
  • データ提供元
    CJP書誌  CJP引用  NDL  IR  J-STAGE 
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