Method for sensitively detecting tannin acid in beer

A medium-tannin, sensitive detection technology, used in material excitation analysis, fluorescence/phosphorescence, etc., can solve the problems of weak emission intensity, measurement interference, poor selectivity, etc., to achieve strong anti-interference ability, high sensitivity, easy to scale production effect

Inactive Publication Date: 2019-09-17
QINGDAO UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the fluorescence emission intensity of unmodified graphene quantum dots is weak and has no specific functional groups. Therefore, it will cause low detection sensitivity and poor selectivity when used in the detection field. big disturbance

Method used

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  • Method for sensitively detecting tannin acid in beer
  • Method for sensitively detecting tannin acid in beer
  • Method for sensitively detecting tannin acid in beer

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Experimental program
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Embodiment 1

[0042] 1 Experimental part

[0043] 1.1 Chemical reagents

[0044] Graphite powder, ammonia water (NH 3 ·H 2 O) (concentration: 25.0%), sodium hydroxide (NaOH), potassium hydroxide (KOH), hydrochloric acid (HCl), phosphoric acid (H 3 PO 4 ), boric acid (H 3 BO 3 ), acetic acid (HAc), tannic acid (TA), silver nitrate (AgNO 3 ), sodium chloride (NaCl), zinc chloride (ZnCl 2 ), magnesium chloride (MgCl 2 ), calcium chloride (CaCl 2 ), sodium nitrate (NaNO 3 ), sodium nitrite (NaNO 2 ), purchased from Sinopharm Chemical Reagent Co., Ltd. (Shanghai, China). Hydrogen peroxide (H 2 o 2 ) was purchased from Aladdin Biochemical Technology Co., Ltd. (Shanghai, China). All reagents were of analytical grade without any treatment. The experimental water was secondary deionized water (18MΩ·cm).

[0045] 1.2 Instrument device

[0046] JEM-2100F Field Emission Transmission Electron Microscope (JEOL, Japan);

[0047] Bruker Dimension icon atomic force microscope (Bruker, Germ...

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Abstract

The present invention relates to a method for sensitively detecting tannin acid (TA) in beer. The method comprises the steps of: taking graphene oxide (GO) and ammonia water (NH3.H2O) as raw materials, and performing hydrothermal cutting under a strong alkaline condition to prepare amination GQDs (AF-GQDs). The polyphenolic hydroxyl structure of TA enables hydrogen bonding between the TA and the AF-GQDs, and a strong pi-pi interaction can be generated, so that fluorescence quenching of AF-GQDs is caused. A TA quantitative analysis method is established by using the AF-GQDs as a fluorescent probe, and the detection limit is 43.3 nmol/L<-1>; and the method has strong anti-interference ability, and detection of the TA is not interfered by the common small molecules, metal ions, anions, and the like.

Description

technical field [0001] The invention belongs to the field of tannin detection, in particular to a method for sensitively detecting tannin in beer. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Graphene quantum dots (GQDs) refer to graphene sheets with lateral dimensions smaller than 100 nm. Due to quantum confinement effects and edge effects, GQDs have favorable optical properties, such as UV absorption and fluorescence emission. Therefore, GQDs can be used as fluorescent probes in sensing and imaging fields. However, the optical properties of pristine GQDs are poor, and it is necessary to endow GQDs with good properties through functionalization. Common functionaliza...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
CPCG01N21/64
Inventor 海欣李园芳毕赛
Owner QINGDAO UNIV
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