| 光谱学与光谱分析 |
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| Analysis of Primary Elemental Speciation Distribution in Mungbean During Enzymatic Hydrolization |
| LI Ji-hua1, 2, 3,HUANG Mao-fang1, 2, 3,ZHU De-ming1, 3,ZHENG Wei-wan4,ZHONG Ye-jun1, 3 |
1. Agricultural Product Processing Research Institute of Chinese Academy of Tropical Agricultural Sciences, Zhanjiang 524001, China
2. National Technology and Engineering Center of Key Tropical Product, Haikou 571700, China
3. Key Laboratory of Ministry of Agriculture for Tropical Crop Processing, Zhanjiang 524001, China
4. Key Laboratory of Food Science of Ministry of Education, Nanchang University, Nanchang 330047, China |
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Abstract In the present paper, trace elements contents of cuprum, zincum, manganese and ferrum in mungbean and their primary speciation distribution during enzymatic hydrolization were investigated with ICP-AES OPTIMA 5300DV plasma emission spectroscopy. The trace elements were separated into two forms, i.e. dissolvable form and particulate form, by cellulose membrane with 0.45 μm of pore diameter. All the samples were digested by strong acid (perchloric acid and nitric acid with 1∶4 ratio ). The parameters of primary speciations of the four elements were calculated and discussed. The results showed: (1) Contents of cuprum, zincum, manganese and ferrum in mungbean were 12.77, 31.26, 18.14 and 69.38 μg·g-1 (of dry matter), respectively. Different treatment resulted in different elemental formulation in product, indicating that more attention should be paid to the trace elements pattern when producing mungbean beverage with different processes. (2) Extraction rates of cuprum, zincum, manganese and ferrum in extract were 68.84%, 51.84%, 63.97% and 30.40% with enzymatic treatments and 36.22%, 17.58%, 7.85% and 22.99% with boil treatment, respectively. Both boil and enzymatic treatments led to poor elemental extraction rates, which proved that it was necessary to take deep enzymatic hydrolysis treatment in mungbean beverage process as the trace element utilization rate was concerned. (3) Amylase, protease and cellulose showed different extraction effectiveness of the four trace elements. Generally, protease exhibited highest efficiency for the four elements extraction. All of the four trace elements were mostly in dissolvable form in all hydrolysates and soup. (4) Relative standard deviations and recovery yields are within 0.12%-0.90%(n=11) and 98.6%-101.4%, respectively. The analysis method in this paper proved to be accurate.
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Received: 2007-11-20
Accepted: 2008-02-21
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Corresponding Authors:
LI Ji-hua
E-mail: woaikexue@126.com
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