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食品分析与检验技术 PowerPoint PPT Presentation


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食品分析与检验技术. 碳水化合物的测定. 食品中碳水化合物的测定. —— 氧化还原滴定法. 氧化还原滴定法概述. 一、常用的氧化还原滴定法: 1. 高锰酸钾法 2. 重铬酸钾法 3. 碘量法 4. 费林试剂法 5. 其它特殊方法(如 2 , 6- 二氯靛酚法) 二、氧化还原滴定法在食品分析中的应用 1. 碳水化合物 含量的测定 2. 维生素 C 含量的测定. 葡萄糖. 单糖. 果糖. 半乳糖. 蔗糖. 有效碳水化合物. 低聚糖. 乳糖. 麦芽糖. 淀粉. 多糖. 纤维素. 无效碳水化合物. 果胶.

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食品分析与检验技术

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4199120


4199120


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1.

2.

3.

4.

5.26-

1.

2.C


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1.1


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25.00mL

50mL

5mL

5mL

250mL

2.5 g

30min


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9mL

2min

10mL

5mL

5mL

2min

2s/V1

10mL

5mL

5mL

2min

2s/

(V1-1)mL


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  • 1

    2

    3

    4

    5


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1.3

()() 1/31/4NaOH( )

(1)


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-

-

()


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,,,,


2 gb t 5009 7 2003

2 GB/T 5009.72003

()

[]


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Cu2++2OH- + 2(C4H4O6)2-[Cu(C4H3O6)2]4-+2H2O

Cu2O+K4Fe(CN)6 + H2O K2Cu2Fe(CN)6 +2KOH


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[]


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[]

+

+ NaOH +

98 100 1000 mL5mL()


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[]

250 mL

5 mL 5 mL 30


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5.00mL250 mL 10mL3

9mL23021

3


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F = c V

F10mL, mg;

c, mgml

VmL


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5.00mL250mL10 mL

323021


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5.00 mL250mL31mL23021 3


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F = c V


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Cu2+


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0.1%10mL

1mL1mL1


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0.1mL


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!


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()


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(3)


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GB/T 5009.82003

C12H22O11+H2OC6H12O6+C6H12O6

342g 180g 180g

342/180+180=0.95

1g0.95g


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0.1

250mLl00mL5mL6molL68-70152NaOH100m1


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(4)

()


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20200mg


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1.4


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30

+201.5-+205


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()


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156020m155-601

116020mL250mL


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2.C

CC

C23 -

C


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2,6-

26-)

2,6


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2%: 2g100ml

(1mg/ml): 100mg(,)2%,100ml,,

2,6-: 50mg2,6-200mL52mgNaHCO3,250mL,(4).,


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Vc

1. Vc

2. Vc

Vc+ 2KIO3 Vcr+ 2KIO2

C1V1:C2V2=1:2 (Vc176.13, C1: Vc)

C1= (C2V2/2V1) 176.13

3. (2%)

4. (26-)

5.

6. : (!)


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VC5mL6%KI0.5mL130.001MKIO3

mg/mL=V1 0.088/ V2

V1:0.001N KIO3mL

V2 :Cg

0.088 :1mL0.001mol/LKIO3Cmg/mL

5mLV C 5mL1% 26-15


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26-CT

T= C V1/ V2

C - Cmg/mL

V1 -CmL

V2 -26-mL


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C

50g2%100ml

5ml15


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C

VCmg/100g=V T/ W100

V -mL

T -1mLC

W-

2,630


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  • 1Kg(mmol)


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KII2NaS2O3I2

30mL -CHCl3

CHCl3

1mLKI

5min

100mL

NaS2O3


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  • 1. KSP

  • 2.

  • 3.

  • 4.


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  • Ag+ +X- AgX

    Ag+ + SCN- AgSCN

  • Cl-Br-I-Ag+SCN-


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1. 0.1mol/L AgNO3

2. NaCl AR

3. 5% K2CrO4


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0.1mol/L AgNO3

981020.5850g100 mL100mL23

20.00mL250mL100mL5%1mL0.1mol/LAgNO3AgNO3V2


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0.1mol/LAgNO3

C

V2(mL)


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1. 5.00 mL100 mL

2.12.00 mL250mL100mL5%1 mL0.1mol/L AgNO3AgNO3V1

3. 80mL5%1 mL0.1mol/L AgNO3AgNO3V0


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C

V1mL

V0mL

VmL

VmL


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520g250 mL80150mL909830 min100250mL25.0-50.0 mL


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Thank You !


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