橡子中单宁的检测方法研究

论文编号:CL028 论文字数:9745,页数:22

摘要：本论文以小和山上采集的橡子为原料，用重铬酸钾氧化-硫酸亚铁铵反滴定来测定橡子中单宁的含量。把所得的橡子放于红外烘箱中在60℃条件下烘干5小时，对其去壳和皮，为了使取样的橡子仁具有普遍性和多样性，对将要碾压的橡子仁进行4分法取样。对橡子仁进行粉碎，橡子粉经50目标准筛过筛。把所得的橡子粉放于红外烘箱中在90℃条件下测定橡子粉中的含水率。把已测定含水率的橡子粉分成2份，放于密封袋中，并将密封袋放于干燥器中保存以防止受潮。实验中利用重铬酸钾氧化-硫酸亚铁铵反滴定，经过14小时，每2小时换水得到总的单宁含量为每10g中单宁含量为1.0764即10.764%，由于单宁容易氧化，常规水提法所需要的时间又比较长，因此用超声波辅助作比较。进行单宁的回收率实验，回收率为 98.2% 。

关键词：橡子；单宁；检测；超声波

Abstract: In this thesis, small and mountains as the raw material collected acorns, oxidation with potassium dichromate - ferrous ammonium sulfate titration to determine anti-tannin content of acorns. The proceeds of acorns put in infrared oven drying at 90 ℃ for 5 hours, their skin peeled and, in order to sample the acorns Jen universal and diversity, will be rolling the acorns Jen 4 and sampling.On acorns in the grinding mortar to smash Ren, acorn flour sifted through 50 mesh sieve. The proceeds of the acorn powder put in infrared oven at 90 ℃ for determination of moisture content of acorns in the powder. Determination of the moisture content of acorns has been divided into 2 powder, placed in sealed bags, and put in the dryer in sealed bags to prevent moisture preservation.Experiments using potassium dichromate oxidation - anti-ferrous ammonium sulfate titration, after 14 hours, changing the water every 2 hours by the total tannin content of tannin content per 10g as 1.0764 or 10.764%, due to easy oxidation of tannin, conventional water extraction time required and relatively long, compared with the ultrasonic wave. The recovery experiments carried out tannins, recovery was 98.2%.

Key words: Acorn; tannin; detection; ultrasonic

目录

中文摘要I

英文摘要II

目录III

1．绪论1

1.1 引言1

1.1.1橡子的简介1

1.1.2单宁的简介1

1.2橡子制品的市场前景和保健功能3

1.3橡子的营养价值3

1.4橡子中单宁含量测定方法的研究进展4

1.5超声波的各种效应 6

1.6课题的提出6

2．实验部分7

2.1 实验原理7

2.2 原料和试剂7

2.3实验设备7

2.4实验步骤8

2.41标准溶液等的配制8

2.42-2.47标准单宁的测定8

2.5橡子中单宁含量的测定10

2.51橡子中含水率的测定10

2.52橡子中单宁总含量的测定11

2.6回收试验13

3．讨论14

4.结论15

致谢17

参考文献18