CN112868883A - Preparation process of corn water-soluble protein - Google Patents
Preparation process of corn water-soluble protein Download PDFInfo
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- CN112868883A CN112868883A CN202110131116.9A CN202110131116A CN112868883A CN 112868883 A CN112868883 A CN 112868883A CN 202110131116 A CN202110131116 A CN 202110131116A CN 112868883 A CN112868883 A CN 112868883A
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- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 title claims abstract description 46
- 235000002017 Zea mays subsp mays Nutrition 0.000 title claims abstract description 46
- 235000005822 corn Nutrition 0.000 title claims abstract description 46
- 102000004169 proteins and genes Human genes 0.000 title claims abstract description 33
- 108090000623 proteins and genes Proteins 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 240000008042 Zea mays Species 0.000 title claims description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000002791 soaking Methods 0.000 claims abstract description 13
- 238000000855 fermentation Methods 0.000 claims description 24
- 239000012528 membrane Substances 0.000 claims description 24
- 230000004151 fermentation Effects 0.000 claims description 21
- 239000007788 liquid Substances 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 16
- 239000000047 product Substances 0.000 claims description 16
- 238000004519 manufacturing process Methods 0.000 claims description 15
- 238000001728 nano-filtration Methods 0.000 claims description 14
- 239000000706 filtrate Substances 0.000 claims description 11
- 239000011347 resin Substances 0.000 claims description 11
- 229920005989 resin Polymers 0.000 claims description 11
- 244000063299 Bacillus subtilis Species 0.000 claims description 9
- 235000014469 Bacillus subtilis Nutrition 0.000 claims description 9
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 claims description 8
- 240000004808 Saccharomyces cerevisiae Species 0.000 claims description 8
- 235000014680 Saccharomyces cerevisiae Nutrition 0.000 claims description 8
- 239000000945 filler Substances 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 8
- 239000003456 ion exchange resin Substances 0.000 claims description 8
- 229920003303 ion-exchange polymer Polymers 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 7
- 241000235646 Cyberlindnera jadinii Species 0.000 claims description 5
- 240000001046 Lactobacillus acidophilus Species 0.000 claims description 4
- 235000013956 Lactobacillus acidophilus Nutrition 0.000 claims description 4
- 244000199866 Lactobacillus casei Species 0.000 claims description 4
- 235000013958 Lactobacillus casei Nutrition 0.000 claims description 4
- 244000057717 Streptococcus lactis Species 0.000 claims description 4
- 235000014897 Streptococcus lactis Nutrition 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 229940039695 lactobacillus acidophilus Drugs 0.000 claims description 4
- 229940017800 lactobacillus casei Drugs 0.000 claims description 4
- 241000194031 Enterococcus faecium Species 0.000 claims description 3
- 240000006024 Lactobacillus plantarum Species 0.000 claims description 3
- 235000013965 Lactobacillus plantarum Nutrition 0.000 claims description 3
- 241000190950 Rhodopseudomonas palustris Species 0.000 claims description 3
- 238000010564 aerobic fermentation Methods 0.000 claims description 3
- 229940072205 lactobacillus plantarum Drugs 0.000 claims description 3
- 238000001471 micro-filtration Methods 0.000 claims description 3
- 238000000108 ultra-filtration Methods 0.000 claims description 3
- 241000194032 Enterococcus faecalis Species 0.000 claims description 2
- 241000191998 Pediococcus acidilactici Species 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 230000014616 translation Effects 0.000 abstract description 2
- 241000209149 Zea Species 0.000 abstract 2
- 230000029087 digestion Effects 0.000 abstract 1
- 239000012452 mother liquor Substances 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 6
- 238000003756 stirring Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000007654 immersion Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 241000222120 Candida <Saccharomycetales> Species 0.000 description 2
- 229920002261 Corn starch Polymers 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 2
- 239000008120 corn starch Substances 0.000 description 2
- 235000019621 digestibility Nutrition 0.000 description 2
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229940088594 vitamin Drugs 0.000 description 2
- 229930003231 vitamin Natural products 0.000 description 2
- 235000013343 vitamin Nutrition 0.000 description 2
- 239000011782 vitamin Substances 0.000 description 2
- PQUCIEFHOVEZAU-UHFFFAOYSA-N Diammonium sulfite Chemical compound [NH4+].[NH4+].[O-]S([O-])=O PQUCIEFHOVEZAU-UHFFFAOYSA-N 0.000 description 1
- IMQLKJBTEOYOSI-GPIVLXJGSA-N Inositol-hexakisphosphate Chemical compound OP(O)(=O)O[C@H]1[C@H](OP(O)(O)=O)[C@@H](OP(O)(O)=O)[C@H](OP(O)(O)=O)[C@H](OP(O)(O)=O)[C@@H]1OP(O)(O)=O IMQLKJBTEOYOSI-GPIVLXJGSA-N 0.000 description 1
- IMQLKJBTEOYOSI-UHFFFAOYSA-N Phytic acid Natural products OP(O)(=O)OC1C(OP(O)(O)=O)C(OP(O)(O)=O)C(OP(O)(O)=O)C(OP(O)(O)=O)C1OP(O)(O)=O IMQLKJBTEOYOSI-UHFFFAOYSA-N 0.000 description 1
- 241000190932 Rhodopseudomonas Species 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- LAKMMFCMJIXETM-UHFFFAOYSA-N [S].OS(O)=O Chemical compound [S].OS(O)=O LAKMMFCMJIXETM-UHFFFAOYSA-N 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 230000000433 anti-nutritional effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000796 flavoring agent Substances 0.000 description 1
- 235000019634 flavors Nutrition 0.000 description 1
- 230000002496 gastric effect Effects 0.000 description 1
- 235000014655 lactic acid Nutrition 0.000 description 1
- 239000004310 lactic acid Substances 0.000 description 1
- 230000002503 metabolic effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229940068041 phytic acid Drugs 0.000 description 1
- 235000002949 phytic acid Nutrition 0.000 description 1
- 239000000467 phytic acid Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23J—PROTEIN COMPOSITIONS FOR FOODSTUFFS; WORKING-UP PROTEINS FOR FOODSTUFFS; PHOSPHATIDE COMPOSITIONS FOR FOODSTUFFS
- A23J1/00—Obtaining protein compositions for foodstuffs; Bulk opening of eggs and separation of yolks from whites
- A23J1/16—Obtaining protein compositions for foodstuffs; Bulk opening of eggs and separation of yolks from whites from waste water of starch-manufacturing plant or like wastes
Abstract
The invention relates to the technical field of protein production, in particular to a preparation process of corn water-soluble protein. The preparation method can effectively treat corn soaking water, and the obtained protein product has high protein content and easy digestion.
Description
Technical Field
The invention relates to the technical field of protein production, in particular to a preparation process of corn water-soluble protein.
Background
Corn deep processing enterprises mainly adopt a wet process to produce corn starch, corn kernels are soaked in water, a certain chemical reagent is added, a large amount of corn soaking water is generated in the process, and the corn soaking water can cause certain pollution to the environment if not effectively treated. At present, most enterprises concentrate corn soaking water to corn steep liquor with a solid content of about 45%, and although the corn steep liquor contains abundant amino acids, various vitamins and proteins, the corn steep liquor is poor in taste and difficult to apply in the feed industry due to high salinity and containing anti-nutritional factors such as phytic acid, pigments and sulfurous acid; therefore, in order to solve the above problems, it is necessary to establish a process for preparing water-soluble protein of corn.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the defects in the prior art, the preparation process of the corn water-soluble protein is provided, the corn soaking water can be effectively treated, and the obtained protein product has high protein content and is easy to digest.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a process for preparing the water-soluble protein of corn includes such steps as fermenting the effluent liquid of corn immersing water adsorbed by resin column, separating the fermented product, collecting filtrate, filtering by nano-filter membrane, and drying the trapped liquid.
As an improved technical scheme, the strain added in the fermentation treatment is an aerobic fermentation strain, and the strain is at least one of bacillus natto, candida utilis and beer yeast.
As an improved technical scheme, the strain added during fermentation treatment is an anaerobic fermentation strain, and the strain is one or more of lactobacillus casei, streptococcus faecalis, pediococcus acidilactici, bacillus natto, streptococcus lactis, candida utilis, lactobacillus plantarum, streptococcus faecium, bacillus subtilis, lactobacillus acidophilus, saccharomyces cerevisiae and rhodopseudomonas palustris.
As an improved technical scheme, the filler in the resin column is weakly alkaline ion exchange resin, and the flow rate of the corn soaking water is 1-2 BV/h.
As an improved technical scheme, a microfiltration membrane or an ultrafiltration membrane with the molecular weight cut-off of 1-10 ten thousand is adopted for filtering during the separation of the fermentation product, and the collected cut-off liquid is continuously fermented.
As an improved technical scheme, an organic nanofiltration membrane with the molecular weight cut-off of 300-2000 is adopted for filtration during nanofiltration.
As an improved technical scheme, the collected filtrate is filtered by adopting an organic nanofiltration membrane to obtain trapped fluid, and the trapped fluid is dried under the conditions that the spraying pressure is 0.6-1.6MPa, the air inlet temperature is 120-180 ℃, and the air outlet temperature is 70-90 ℃ to obtain the protein.
After the technical scheme is adopted, the invention has the beneficial effects that:
the method comprises the steps of filtering corn soaking water generated in the production of corn starch by a resin column, separating a fermentation product obtained by fermenting a collected effluent liquid by an aerobic fermentation strain or an anaerobic fermentation strain by a microfiltration membrane or an ultrafiltration membrane, continuously fermenting the collected trapped fluid, filtering the collected filtrate by a nanofiltration membrane, and drying the collected trapped fluid to obtain the water-soluble protein. By adopting the method, the residual sugar (such as starch), inorganic nitrogen (mainly ammonium salt and nitrate) and inorganic sulfur (sulfurous acid) in the corn soaking water can be utilized in the fermentation process, so that the inorganic nitrogen concentration in the corn soaking water and the content of harmful substances (sulfurous acid, ammonium salt and nitrate) in the corn soaking water are reduced, and the safety of the protein powder is improved; the obtained protein contains metabolic products of strains such as lactic acid, vitamins and the like, and the flavor and the quality of the protein are greatly improved.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A process for preparing water-soluble corn protein includes such steps as adsorbing corn water (100L) by resin column (weakly alkaline ion exchange resin as filler) from bottom to top at 1-2BV/h, fermenting, adding candida utilis and beer yeast (0.012 kg), regulating pH to 5.0-6.0, fermenting at 30 deg.C while stirring, and separating the fermented product with microfilter membrane with molecular weight cut-off of 1-10 ten thousand. The trapped mother liquor is recycled and enters a fermentation tank for continuous fermentation. The collected filtrate is filtered by adopting an organic nanofiltration membrane with the molecular weight cutoff of 300-.
Example 2
A process for preparing water-soluble corn protein includes such steps as adsorbing the corn water (100L) by resin column (weakly alkaline ion exchange resin as filler) from bottom to top at 1-2BV/h, fermenting, adding bacillus natto, candida and beer yeast (0.018 kg), regulating pH value to 5.0-6.0, fermenting at 30 deg.C for 24 hr while stirring, adding said bacillus natto, candida and beer yeast in the ratio of 1:1:1, and separating the fermented product by microfilter membrane with molecular weight cutoff of 1-10 ten thousand to obtain filtered clear liquid and mother liquid. The trapped mother liquor is recycled and enters a fermentation tank for continuous fermentation. The collected filtrate is filtered by adopting an organic nanofiltration membrane with the molecular weight cutoff of 300-.
Example 3
A process for preparing water-soluble protein of corn includes such steps as adsorbing the corn immersion water (100L) by resin column (weakly alkaline ion exchange resin as filler) from bottom to top at 1-2BV/h, fermenting, adding lactobacillus casei and streptococcus lactis (0.012 kg) by 1 ‰, regulating pH to 4.0-6.0, fermenting at 30 deg.C under sealed condition for 24 hr, and separating the fermented product with microfilter membrane whose molecular weight is 1-10 ten thousand to obtain filtered clear liquid and mother liquid. The trapped mother liquor is recycled and enters a fermentation tank for continuous fermentation. The collected filtrate is filtered by adopting an organic nanofiltration membrane with the molecular weight cutoff of 300-.
Example 4
A process for preparing water-soluble protein of corn includes such steps as adsorbing corn immersion water (100L) by resin column (weakly alkaline ion exchange resin as filler) from bottom to top at 1-2BV/h, fermenting, adding lactobacillus casei, streptococcus lactis and lactobacillus acidophilus (0.018 kg/h) in the weight of the liquid (1.5 ‰) while regulating pH value to 5.0-6.0, fermenting at 30 deg.C for 24 hr while stirring, and separating the fermented product with microfilter membrane with molecular weight cutoff of 1-10 ten thousand to obtain filtered clear liquid and mother liquid. The trapped mother liquor is recycled and enters a fermentation tank for continuous fermentation. The collected filtrate is filtered by adopting an organic nanofiltration membrane with the molecular weight cutoff of 300-.
Example 5
A process for preparing water-soluble protein of corn includes such steps as adsorbing corn water (100L) by resin column (weakly alkaline ion exchange resin as filler) from bottom to top at 1-2BV/h, fermenting, adding lactobacillus plantarum, bacillus subtilis, lactobacillus acidophilus and rhodopseudomonas palustris (0.012 kg) by weight (1 ‰) of solid content in the liquid), regulating pH to 5.0-6.0, fermenting at 30 deg.C for 24 hr while stirring in sealed fermentor, and separating the fermented product with microfilter membrane whose molecular weight is 1-10 ten thousand to obtain filtered liquid and mother liquid. The trapped mother liquor is recycled and enters a fermentation tank for continuous fermentation. The collected filtrate is filtered by adopting an organic nanofiltration membrane with the molecular weight cutoff of 300-.
Example 6
A process for preparing water-soluble protein of corn includes such steps as adsorbing corn immersion water (100L) by resin column (weakly alkaline ion exchange resin as filler) from bottom to top at 1-2 BV/hr, fermenting, adding streptococcus faecium, beer yeast and marsh rhodopseudomonas by weight (1.5 ‰) of solid content in the liquid), regulating pH value to 5.0-6.0, fermenting at 30 deg.C for 24 hr while stirring, and separating the fermented product by microfilter with molecular weight cut-off of 1-10 ten thousand to obtain clear liquid and mother liquid. The trapped mother liquor is recycled and enters a fermentation tank for continuous fermentation. The collected filtrate is filtered by adopting an organic nanofiltration membrane with the molecular weight cutoff of 300-.
In order to better prove that the protein obtained by the process method of the invention has good quality, the traditional process (the product obtained by concentrating and drying corn soaking water) is taken as a comparative example, and the quality of the protein products in examples 1-6 and the indexes of the products in the comparative example are shown in the following table.
| Examples | Protein content | Digestibility of gastric proteins | Ash content | Inorganic sulfur | Sugar content | Yield of |
| Example 1 | 60.8％ | 98.4％ | 8％ | 0.04％ | 1％ | 64.2％ |
| Example 2 | 64％ | 99.6％ | 7.8％ | 0.03％ | 0.8％ | 65.6％ |
| Example 3 | 62.8％ | 99.4％ | 8.3％ | 0.05％ | 1.2％ | 62.4％ |
| Example 4 | 63.8％ | 99.2％ | 8.8％ | 0.06％ | 0.7％ | 60.4％ |
| Example 5 | 61.6％ | 98.8％ | 8.3％ | 0.04％ | 1.2％ | 63.8％ |
| Example 6 | 63％ | 99.2％ | 8.8％ | 0.05％ | 0.8％ | 61.6％ |
| Comparative example | 43％ | 92.3％ | 16％ | 0.1％ | 10.2％ | 100％ |
As can be seen from the data in the table above, the protein content and digestibility obtained by the process of the invention are high when the corn steep water is treated by the process of the invention compared with the treatment process of the comparative example.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. A preparation process of corn water-soluble protein is characterized by comprising the following steps: the preparation process comprises the steps of fermenting effluent liquid obtained after corn soaking water is adsorbed by a resin column, filtering filtrate obtained by separating and collecting fermentation products by adopting a nanofiltration membrane, and drying collected trapped fluid to obtain the water-soluble protein.
2. The process for preparing corn water-soluble protein according to claim 1, wherein the process comprises the following steps: the strain added during fermentation treatment is aerobic fermentation strain, and the strain is at least one of bacillus natto, candida utilis and beer yeast.
3. The process for preparing corn water-soluble protein according to claim 1, wherein the process comprises the following steps: the strain added during fermentation treatment is anaerobic fermentation strain, and the strain is one or more of lactobacillus casei, streptococcus faecalis, pediococcus acidilactici, bacillus natto, streptococcus lactis, candida utilis, lactobacillus plantarum, streptococcus faecium, bacillus subtilis, lactobacillus acidophilus, beer yeast and rhodopseudomonas palustris.
4. The process for preparing corn water-soluble protein according to claim 1, wherein the process comprises the following steps: the filler in the resin column is weakly alkaline ion exchange resin, and the flow rate of the corn soaking water is 1-2 BV/h.
5. The process for preparing corn water-soluble protein according to claim 1, wherein the process comprises the following steps: and filtering the fermentation product by adopting a microfiltration membrane or an ultrafiltration membrane with the molecular weight cutoff of 1-10 ten thousand, and continuously fermenting the collected cutoff liquid.
6. The process for preparing corn water-soluble protein according to claim 1, wherein the process comprises the following steps: during nanofiltration, an organic nanofiltration membrane with the molecular weight cutoff of 300-2000 is adopted for filtration.
7. The process for preparing corn water-soluble protein according to claim 1, wherein the process comprises the following steps: the collected filtrate is filtered by an organic nanofiltration membrane to obtain trapped fluid, and the trapped fluid is dried under the conditions that the spraying pressure is 0.6-1.6MPa, the air inlet temperature is 120-180 ℃, and the air outlet temperature is 70-90 ℃ to obtain the protein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110131116.9A CN112868883A (en) | 2021-01-30 | 2021-01-30 | Preparation process of corn water-soluble protein |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110131116.9A CN112868883A (en) | 2021-01-30 | 2021-01-30 | Preparation process of corn water-soluble protein |
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| CN112868883A true CN112868883A (en) | 2021-06-01 |
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| CN202110131116.9A Pending CN112868883A (en) | 2021-01-30 | 2021-01-30 | Preparation process of corn water-soluble protein |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104757274A (en) * | 2015-04-13 | 2015-07-08 | 山东省鲁洲食品集团有限公司 | Method for preparing feed protein power and fermented nutrition improver through comprehensive utilization of corn steep liquor |
| CN105494978A (en) * | 2015-12-21 | 2016-04-20 | 河南省新大牧业有限公司 | Method for preparing fermented pig feed through corn soaking solution and fermented pig feed prepared through method |
| CN110627829A (en) * | 2019-09-02 | 2019-12-31 | 青岛西海岸第六纪生态农业发展有限公司 | Corn soaking water recycling treatment method |
| CN111592136A (en) * | 2019-12-30 | 2020-08-28 | 江苏久吾高科技股份有限公司 | Method and device for efficiently utilizing components of corn soaking water |
-
2021
- 2021-01-30 CN CN202110131116.9A patent/CN112868883A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104757274A (en) * | 2015-04-13 | 2015-07-08 | 山东省鲁洲食品集团有限公司 | Method for preparing feed protein power and fermented nutrition improver through comprehensive utilization of corn steep liquor |
| CN105494978A (en) * | 2015-12-21 | 2016-04-20 | 河南省新大牧业有限公司 | Method for preparing fermented pig feed through corn soaking solution and fermented pig feed prepared through method |
| CN110627829A (en) * | 2019-09-02 | 2019-12-31 | 青岛西海岸第六纪生态农业发展有限公司 | Corn soaking water recycling treatment method |
| CN111592136A (en) * | 2019-12-30 | 2020-08-28 | 江苏久吾高科技股份有限公司 | Method and device for efficiently utilizing components of corn soaking water |
Non-Patent Citations (1)
| Title |
|---|
| 史作清: "《吸附分离树脂在医药工业中的应用》", 30 September 2008, 化学工业出版社 * |
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Application publication date: 20210601 |