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Method for co-producing D-tagatose, arabitol and galactitol and application

A technology of arabinitol and galactitol, applied in the field of bioengineering, can solve the problems of high biochemical oxygen demand of whey powder, not being well utilized, waste of resources and the environment, and achieve high-value utilization and reduce Process cost, the effect of increasing product yield

Pending Publication Date: 2022-01-11
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Whey usually refers to the main by-product produced in the process of producing cheese from milk. The whey powder produced generally contains 70% to 80% lactose. It is reported that the annual output of lactose obtained from this is about more than 1.4 million tons, and is currently underutilized
In addition, due to the high biochemical oxygen demand (BOD) of whey powder, if it is not properly utilized, it will not only cause waste of resources but also cause serious environmental pollution.
In view of this, the current production of D-tagatose from whey powder has attracted the attention of researchers and research reports, but the D-glucose produced by the hydrolysis of lactose during the preparation process has not been successfully utilized and remains completely in the Waste of resources in the reaction solution

Method used

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  • Method for co-producing D-tagatose, arabitol and galactitol and application
  • Method for co-producing D-tagatose, arabitol and galactitol and application
  • Method for co-producing D-tagatose, arabitol and galactitol and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1. Construction and dual-enzyme expression of overexpressed recombinant β-gal and L-AI genetically engineered bacteria:

[0037] (1) Acquisition of araA gene:

[0038] According to the araA gene (GenBankNo.CP055123.1) sequence of Lactobacillus plantarum encoding L-AI published in Genbank and the characteristics of the homology arm of the vector pANY1, the upstream primer 5'-taactttaagaaggagatatacatATGTTATCAGTACCTGATTATGAG-3' (SEQ ID NO.1) and the downstream primer 5'-aggagctcccatggaggTTACTTTAAGAATGCCTTAGTCAT-3' (SEQ ID NO.2), the first half of which is the upstream and downstream homology arms homologous to the pANY1 plasmid.

[0039] (2) Using Lactobacillus plantarum CY.6 (Lactobacillus plantarum CY.6, screening method references Zhang G, Zabed H M, J Yun, et al. Bioresource Technology, 2020, 305:123010.) genomic DNA as a template, using step (1) The target gene araA was amplified by PCR using the upstream primers and downstream primers synthesized in , and...

Embodiment 2

[0049] Embodiment 2. whey powder fed-batch production D-tagatose:

[0050] (1) Inoculate the genetically engineered bacteria E.coli BL21 / β-gal-L-AI in Kan-Cl-LB, shake and culture at 37°C and 200rpm until the logarithmic phase of growth, and prepare a seed solution; then the seeds When inoculated in Kan-Cl-LB with an inoculum volume fraction of 1% and cultivated to an OD of 0.6-0.8, the inducer IPTG was added to make the final concentration 1mM, and then overnight at 25°C and 120rpm Induced joint expression of β-gal and L-AI.

[0051] (2) The bacterial solution successfully expressing the dual enzymes was refrigerated and centrifuged at 8000rpm at 4°C for 10 minutes to collect the bacterial cells, and 100mM sodium phosphate buffer solution (pH 7.0) with 2% Triton-x-100 (by volume fraction) was used to incubate at room temperature After treatment for 30 min, the bacteria were collected by centrifugation, and the bacteria were washed twice with pH 7.0, 100 mM sodium phosphate b...

Embodiment 3

[0054] Example 3: Fermentation of D-Glucose and D-Galactose by Maggi Mekki Yeast to Co-produce D-Arabitol and Galactitol

[0055] (1) Streak the preserved Metschnikowia pulcherrima E1 (CCTCC NO:M2019256) on YPD solid medium (glucose 20g / L, peptone 20g / L, yeast powder 10g / L, agar 15g / L) After 48 hours of static culture in an incubator at 30°C, a single colony was picked and inoculated in YPD liquid medium, and cultured with shaking at 30°C and 200 rpm for 16 hours to the logarithmic phase to prepare a seed solution.

[0056] (2) Use a refrigerated centrifuge at 8000rpm and 4°C for 10 minutes to remove the cells in the D-tagatose conversion solution produced by the pre-transformation, take the supernatant and heat to boil to denature the residual protein in the solution, and then centrifuge again and take the supernatant as The substrate solution of yeast fermentation reaction in this step, and the pH of the substrate solution is adjusted to about 6.5.

[0057] (3) Prepare fermen...

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Abstract

The invention provides a method for co-producing D-tagatose, arabitol and galactitol and an application, and belongs to the technical field of biological engineering. According to the invention, a genetically engineered bacterium E.coli BL21 / beta-gal-L-AI is utilized to convert whey so as to prepare the D-tagatose; and then the D-arabitol and the galactitol are produced by using byproducts generated in the preparation process of fermenting the D-tagatose by using the Metschnikowia pulcherrima, so as to finally realize efficient co-production of the D-tagatose, the D-arabitol and the galactitol.

Description

technical field [0001] The invention belongs to the technical field of bioengineering, and in particular relates to a method and application for co-producing D-tagatose, arabitol and galactitol. Background technique [0002] D-tagatose is a natural ketohexose with molecular formula C 6 h 10 o 6 , which is a low-calorie sweet prebiotic, has the effects of improving intestinal flora, treating type 2 diabetes, lowering cholesterol, anti-caries, and treating anemia. It can replace sucrose and is widely used in fruit juice, beverages, chewing gum and other food fields. The production of D-tagatose mainly includes chemical method and biological method. Among them, the chemical method has the disadvantages of high energy consumption, many by-products, cumbersome purification and large pollution, which is not conducive to industrial production. Biological methods usually use D-galactose as a substrate and use L-arabinose isomerase (L-AI) to isomerize it into D-tagatose, but since...

Claims

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Application Information

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IPC IPC(8): C12P19/02C12P7/18C12R1/19C12R1/645
CPCC12P19/02C12P7/18
Inventor 齐向辉张国艳员君华李小兰张宇飞黄嘉琦王江飞
Owner JIANGSU UNIV
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