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Do you know the color of these bacteria?

Time : 2019-09-02 Hits : 17

Natural dyes have been used to dye fabrics since ancient times.From the 19th century, cheap and easy to make, wide range of synthetic dyes gradually occupied the market.However, some synthetic dyes are banned because of their carcinogenic and allergenic effects on humans.


With the improvement of people's living standard, healthy and environmental protection concept of life began to be highly respected.Bacteria, fungi and other microorganisms can produce natural pigments stably through fermentation and culture, which is considered to be one of the main sources of natural dyes that may replace synthetic dyes.In recent years, its application in textile dyeing has been paid more and more attention.


In addition, the hair color groups of natural dyes produced by microorganisms can be further chemically modified to obtain a broader spectrum.In addition to bright color, some anthraquinone microbial dyes also have certain antibacterial effects, and have potential application value in the functional finishing of fabrics.


The color of a bacterium dyed by microorganisms

Purple bacillus: blue and purple

Natural blue pigments are rare because there are fewer microorganisms in the world that produce them.In 1997, a bacterium capable of producing blue and purple bacteriocins was reported in Japan. This bacterium originated from contaminated silk: the silk was isolated from the silk after being left in a wetting state for several months, and some of the silk turned blue and purple, and then used the organic solvent tetrahydrofuran to extract pigment from the bacteria.It is found that the pigment has stable properties and good color, and is suitable for dyeing natural fibers such as silk, wool and cotton.


Vibrio: red

Some researchers isolated a strain of vibrio, which can produce a bright red dye, from the Marine sediments, and used the resulting cloverazine to dye wool, nylon, silk and other fabrics.Bacterial culture process: firstly, the single colony on the basic seawater medium (SBRM) AGAR plate was inoculated into conical flask containing SBRM liquid medium, and the culture was carried out on a shaker at 30 ℃ with a rotation speed of 200 r/min for 12 h, and then the culture was expanded. After that, the clostridium was purified through filtration, concentration, elution and other steps, and then the clostridium was obtained.


The color of a fungus dyed by microorganisms

Aspergillus Niger sporangium powder: color can be adjusted

Aspergillus Niger is a widely distributed aspergillus fungus in grain, air and soil.Some researchers creatively used potato glucose as the liquid medium, and added a certain amount of mixed rare earth into aspergillus Niger spore powder as the dye solution, and then added sterilized silk fabric for dyeing.The colour and lustre of the dyed fabrics can be changed by controlling the addition of sporangia powder.


Aspergillus: red, purple, orange, yellow

Red aspergillus can produce a large number of natural monascus pigments, which mainly contain 6 kinds of alcohol-soluble pigments and 4 kinds of water-soluble pigments, including red pigments, purple pigments, orange pigments and yellow pigments.Researchers use red aspergillus directly on silk fabric dyeing, the specific method is: will cultivate good red aspergillus vaccination to medium, and 28 ~ 30 ℃ in expanding as education culture, after adding rare earth as mordant, to low temperature dyeing of silk fabric after sterilization, fastness of the dyed fabric can achieve basic requirements.

Fusarium oxysporum: pinkish purple


Five species of fusarium oxysporum were isolated from citrus tree roots infected with root rot, and a strain capable of producing pink-purple anthraquinone dyes was screened and applied to the dyeing of wool fabrics.It is found that the fabric not only has a bright color, but also has a high color fastness.


Cordyceps sinensis: 6 species of red

Cordyceps sinensis BCC1869 is an insect-causing fungus, which can produce six kinds of red naphthoquinones with chemical structure similar to commercial red pigments shikonin and vermonin.Studies have shown that the naphthoquinones cultured by cordyceps sinensis have extremely high thermal stability and strong acid-base resistance and antibacterial properties. Therefore, cordyceps sinensis BCC1869, as a red dye, has great commercial application value for dyeing and finishing textiles. However, there are no relevant reports on dyeing with it at present

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