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A strain of Aspergillus niger with high yield of pectinase and its application

A technology of Aspergillus niger and pectinase, applied in the field of bioengineering, can solve the problems of late start, low enzyme activity, and restrictions on wide application

Active Publication Date: 2021-06-18
SHANDONG LONGKETE ENZYME PREPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its late start, low enzyme activity and high production costs, the wide application of this enzyme has been severely limited. At present, it is mainly used in fruit juice production, fruit wine brewing, canning processing, wood preservation, pulp bleaching, degumming of hemp, and prevention and treatment of plant diseases, etc. aspect

Method used

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  • A strain of Aspergillus niger with high yield of pectinase and its application
  • A strain of Aspergillus niger with high yield of pectinase and its application
  • A strain of Aspergillus niger with high yield of pectinase and its application

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Experimental program
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Effect test

Embodiment 1

[0035] Example 1 Aspergillus niger LD-092 fermentation enzyme production and the extraction method of pectinase produced

[0036] The fermentative enzyme production method of Aspergillus niger LD-092 mainly comprises the following steps:

[0037] Slant culture: Pick a ring of Aspergillus niger LD-092 and inoculate it on a solid slant medium, and culture at a constant temperature of 30°C for 36 hours to obtain first-class seeds;

[0038] Shake flask culture: Take a ring of the first-class seeds and insert them into the seed medium, and cultivate them for 48 hours at a constant temperature of 30°C and a shaker speed of 200r / min to obtain the second-class seed liquid;

[0039] Seed tank cultivation: put the secondary seed solution into the seed tank culture medium at a ratio of 15% (v / v) of the inoculation amount, and cultivate for 45 hours at a constant temperature of 30°C and a rotational speed of 200r / min;

[0040] Fermentation tank culture: The seed liquid in the seed tank i...

Embodiment 2

[0051] Embodiment 2 Aspergillus niger LD-092 fermentation performance verification

[0052] Carry out 50L fermenter verification experiment according to the fermentative enzyme production method of embodiment 1 Aspergillus niger LD-092, fermentation cycle 155h, its 7 batches of fermentative enzyme production situation, the pectinase average enzyme activity in the fermented liquid is 82882U / mL, table 1 shows that the strain not only produces high-yield pectinase, but also has remarkable stability in its fermentation performance and the enzymatic activity of pectinase produced by it.

[0053] Table 1 Enzyme production by fermentation of 7 batches of high pectinase-producing strains

[0054]

Embodiment 3

[0055] Embodiment 3 pectinase activity assay method

[0056] (1) Preparation of enzyme liquid: the fermentation liquid was centrifuged at 6000 r / min for 15 min, and the supernatant was collected to be the crude enzyme liquid.

[0057] (2) Determination method: 3,5-dinitrosalicylic acid method (DNS method) is adopted. Take 0.5ml of appropriately diluted crude enzyme solution in a 25mL colorimetric tube, add 2.0ml of 0.4% pectin solution (pH4.0) as a substrate solution, react in a water bath at 45°C for 30min, add DNS solution and boil for 5min, cool down, and constant volume To 25ml, measure the absorbance at 520nm.

[0058] (3) Definition of enzyme activity: under certain conditions, the amount of enzyme needed to decompose pectin to generate 1 μmol galacturonic acid per minute is an enzyme activity unit (U).

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Abstract

The invention belongs to the technical field of bioengineering, and in particular relates to an Aspergillus niger strain with high pectinase production and application thereof. Aspergillus niger LD-092 described in the present invention is by carrying out Co 60 Obtained by radiation mutagenesis treatment, the strain preservation number is CGMCC No.18559. The enzyme activity of pectinase produced by fermentation of Aspergillus niger LD‑092 reaches 80000‑85000U / mL; the optimum pH range of the fermented pectinase is 2.5‑4.0, and the optimum temperature range is 30‑50°C, which has remarkable acid resistance , stored at a pH of 3.0-4.0 for 36 hours, the enzyme activity remains above 85%, can be widely used in industrial production, significantly expands the industrial application range of pectinase, and improves the application value of pectinase.

Description

Technical field: [0001] The invention belongs to the technical field of bioengineering, and in particular relates to an Aspergillus niger strain with high pectinase production and application thereof. Background technique: [0002] Pectinase is a general term for a class of enzymes that can degrade pectin by hydrolysis and cleavage. It is a complex enzyme containing multiple components, mainly including protopectinase, pectin esterase, polygalacturonase and pectin lyase 4 categories. Pectinase was first seen in 1930 and was used to prepare wine and fruit juice. In the 1960s, scientists had a relatively clear understanding of the chemical properties of plant tissue components, so people were able to use pectinase more widely and effectively. [0003] According to reports, more than 40 kinds of microorganisms have been found to produce pectinase in nature, including Aspergillus, Penicillium, Fusarium, Kluyveromyces, and some facultative anaerobic bacteria. At present, pecti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12N1/14C12N9/88C12N9/26C12N9/18C12R1/685
CPCC12N9/18C12N9/2408C12N9/88C12Y301/01011C12Y302/01015C12Y402/02002C12N1/145C12R2001/685
Inventor 郭庆文王克芬张杰刘胜利王兴吉曹世源王金余
Owner SHANDONG LONGKETE ENZYME PREPARATION
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