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WO2005066350A1 - Biological process for the preparation of mineral crystals using plant seeds - Google Patents

Biological process for the preparation of mineral crystals using plant seeds Download PDF

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Publication number
WO2005066350A1
WO2005066350A1 PCT/IB2003/006194 IB0306194W WO2005066350A1 WO 2005066350 A1 WO2005066350 A1 WO 2005066350A1 IB 0306194 W IB0306194 W IB 0306194W WO 2005066350 A1 WO2005066350 A1 WO 2005066350A1
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seeds
range
preparation
mineral crystals
crystals
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PCT/IB2003/006194
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French (fr)
Inventor
Absar Ahmad
Debabrata Rautaray
Ambarish Sanyal
Murali Sastry
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Council Of Scientific And Industrial Research
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Priority to PCT/IB2003/006194 priority Critical patent/WO2005066350A1/en
Priority to AU2003295181A priority patent/AU2003295181A1/en
Publication of WO2005066350A1 publication Critical patent/WO2005066350A1/en

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    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12PFERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
    • C12P3/00Preparation of elements or inorganic compounds except carbon dioxide
    • CCHEMISTRY; METALLURGY
    • C30CRYSTAL GROWTH
    • C30BSINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B29/00Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
    • C30B29/10Inorganic compounds or compositions
    • CCHEMISTRY; METALLURGY
    • C30CRYSTAL GROWTH
    • C30BSINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B7/00Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions
    • C30B7/14Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions the crystallising materials being formed by chemical reactions in the solution

Definitions

  • This invention relates to a biological process for the preparation of mineral crystals using seeds. More particularly it relates to the preparation of size, shape and polymo ⁇ h controlled mineral crystals by simple growth of roots from various seeds in a suitable aqueous solution of a metal ion. Still more it relates to a biological process for the preparation of mineral crystals by the reaction of suitable electrolyte solution with carbon dioxide generated during the root growth from the seed. Still it relates to a biological process for the synthesis controlled mineral crystals by the proteins secreted during the root growth from the seeds that are responsible for the size, shape and polymo ⁇ h control of desired mineral crystals.
  • It relates to a method for producing shape, size and polymo ⁇ h controlled mineral crystals such as in the case of calcium carbonate (CaCO 3 ) where spherical vaterite crystals(most unstable polymo ⁇ h of (CaCO 3 ) were obtained at room temperature, strontium carbonate (SrCO 3 ), barium carbonate (BaCO 3 ) by the natural growth of roots from the seeds.
  • Shape control as well as polymo ⁇ h control of minerals crystals can be obtained by using root growth from different seeds.
  • the shape controlled particles formed by this process can be used in numerous technological and medical applications, e.g., as advanced ceramics, catalysts, filler materials, sensors, semiconductors, pigments, can be used in plastic industries, paper industries and many others.
  • Langmuir monolayers have been shown to induce oriented crystallization from solution of proteins (Uzgiris and Kornberg et al Nature., 1983, 301, 125; Ahlers et al Thin Solid Films., 1989, 180, 93) and other organic and inorganic compounds (Landau et al Nature., 1985, 318, 353). Mann and co-workers have studied the oriented crystallization of CaCO 3 under monolayers of stearic acid (Mann et al, Nature., 1988, 334, 692; Mann et al Nature., 1988, 532, 119).
  • US patent no. 6,325,987 provides a method for production of minerals in which uniformly sized and shaped particles of metal salts are provided comprised of one or more metal cations in combination with one or more simple oxoacid anions and a general method for the controlled precipitation of said metal salts from aqueous solutions.
  • US patent no. 6,383,282 provides a method of pseudophasic extraction method for the separation of minerals which is a aqueous-based extraction method for the separation and recovery of ultra-fine mineral particles.
  • the process operates within the pseudo phase region of the conventional aqueous biphasic extraction system where a low-molecular- weight, water soluble polymer alone is used in combination with a salt and operates within the pseudo-biphase regime of the conventional aqueous biphasic extraction system.
  • US patent no. 6,416,682 provides a method of producing synthetic crystals (typically minerals) or comparable inorganic compounds by reactions of metal salts and metal oxyhydroxides under near-critical, critical or supercritical solvent conditions.
  • US patent no. 6,568,537 provides a method for the flotation of useful minerals, comprising a frother based on dimethyl (isopropenylethynyl) carbinol and a collector, the frother, for improving the technological flotation characteristics, having the following chemical composition, in wt.%: dimethyl (isopropenylethynyl) carbinol, 95.0-98.0; tetramethylbutynediol, 0.1-1.5; diisopropenylacetylene, 0.1-1.0; 2,5-dimethyl-l,4- hexadien-3-one, 1.5-2.5.
  • the main object of the invention is to provide a biological process for the preparation of mineral crystals, which are user friendly.
  • the present invention provides a biological process for the preparation of mineral crystals, which comprises growing of roots from surface sterilized seeds to an aqueous metal salt solution at a temperature in the range of 20 to 35°C for 1 to 5 days to obtain the respective mineral crystals of respective metal carbonates.
  • the invention relates to a biological process for the preparation of shape and polymo ⁇ h controlled mineral crystals by simple growth of roots from various seeds to a suitable aqueous metal ion. More particularly it relates to a biological process for the preparation of mineral crystals by the reaction of suitable electrolyte solution with carbon dioxide generated during the root growth from the seed. Still it relates to a biological process for the synthesis mineral crystals controlled by the proteins secreted during the root growth from the seeds that are responsible for the size, shape and polymo ⁇ h control of desired mineral crystals.
  • More particularly it relates to a method for producing shape, size and polymo ⁇ h controlled mineral crystals such as calcium carbonate (CaCO 3 ), strontium carbonate (SrCO 3 ), barium carbonate (BaCO 3 ) by the natural growth of roots from the seeds.
  • Shape control as well as polymo ⁇ h control of minerals crystals can be obtained by using root growth from different seeds.
  • the process provides a biological process for the preparation of mineral crystals, which comprises growing of roots from surface sterilized seeds to an aqueous metal salt solution at a temperature in the range of 20 to 35°C for 1 to 5 days to obtain the respective mineral crystals of respective metal carbonates.
  • the seeds used are Cicer arietinum, Pisum sativum, Lycopersicon esculentum, Oryza sativa, Triticum aestivum, Coriandrum sativum, Papaver somniferum, Ocimum basilicum, Trigonella foenum-graecum, Vigna radiata, Zea mays, Hordeum vulgare, Brassica campestris, Vigna mungo, Vigna unguiculata, Ricinus communis, Solanum melongena, ,Paspalum scrobiculatum, Raphanus sativus, Gossypium herbaceum, Helianthus annus, Linum usitatissinum, Luffa cylindrica, Cucumis sativus, Cymbopogon flexuosus, Daucus carota, Abelmoschus esculentus, Anethum graveolens, Cajanus cajan, Capsicum ann
  • reaction of the CO 2 generated during root growth and the suitable electrolyte solution is carried out in water.
  • the process of the invention is described herein below with reference to the following examples, which are illustrative and should not be construed as limiting the scope of the invention.
  • This example illustrates the preparation of CaCO 3 crystals by using the seeds of chick pea (Cicer arietinum).
  • the seeds were washed with sterile distilled water and then soaked for 45 min. in water. After soaking, seeds were surface sterilized with Na-hypochlorite solution for 3 mins, then washed well with sterile distilled water and spread on moistened Whatman filter paper in autoclaved Petridish (250 mm diameter). Closed Petridish was placed in the dark, at 25-26°C, for 3 days for germination.
  • the germinated seeds were placed on moistened filter paper support in autoclaved Erlenmeyer flask containing 100 ml sterile 10 "2 M aqueous CaCl 2 solution for 5 to 10 days. The Erlenmeyer flask was then plugged with cotton and incubated 25-26°C. The bio-transformation was routinely monitored by periodic sampling of aliquots (10 ml) under sterile conditions for analysis. The sample was characterized by X-ray diffraction (XRD) measurement. The XRD results shown in table below obtained correspond to that of variety polymo ⁇ h of CaCO 3 . Table 1
  • This example illustrates the preparation of CaCO 3 crystals by using the seeds of Vigna radiata seeds were washed with sterile distilled water and then soaked for 45 min. in water. After soaking, seeds were surface sterilized with Na-hypochlorite solution for 3 mins, then washed well with sterile distilled water and spread on moistened Whatman filter paper in autoclaved Petridish (250 mm diameter). Closed Petridish was placed in the dark, at 25-26 °C, for 3 days for germination. The germinated seeds were placed on moistened filter paper support in autoclaved Erlenmeyer flask containing 100 ml sterile 10 "2 M aqueous CaCl 2 solution for 5 to 10 days.
  • EXAMPLE 3 This example illustrates the preparation of CaCO crystals by using the seeds of Pisum satium seeds were washed with sterile distilled water and then soaked for 45 min. in water. After soaking, seeds were surface sterilized with Na-hypochlorite solution for 3 mins, then washed well with sterile distilled water and spread on moistened Whatman filter paper in autoclaved Petridish (250 mm diameter). Closed Petridish was placed in the dark, at 25-26 °C, for 3 days for germination.
  • This example illustrates the preparation of SrCO crystals by using the seeds of Chick pea (Cicer arietinum) seeds were washed with sterile distilled water and then soaked for 45 min. in water. After soaking, seeds were surface sterilized with Na-hypochlorite solution for 3 mins, then washed well with sterile distilled water and spread on moistened Whatman filter paper in autoclaved Petridish (250 mm diameter). Closed Petridish was placed in the dark, at 25-26 °C, for 3 days for germination.
  • EXAMPLE 5 This example illustrates the preparation of BaCO crystals by using the seeds of Chick pea (Cicer arietinum) seeds were washed with sterile distilled water and then soaked for 45 min. in water.
  • the bio transformation was routinely monitored by periodic sampling of aliquots (10 ml) under sterile conditions for analysis.
  • Advantages of the process claimed in the present invention are: 1.
  • the main advantage of the present invention is the use of natural growth of seeds under aqueous medium.
  • Another major advantage of the present invention is that the mineral crystals formed are quite stable in the aqueous solution.
  • Another advantage of the present invention is that the mineral crystals formed are of highly controlled in shape.
  • Another major advantage of the present invention is that different polymo ⁇ hism of the suitable mineral can be achieved by using suitable seeds. 5. Uniform size control
  • the method of the invention is also enviromnentally friendly and simple.

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  • Chemical & Material Sciences (AREA)
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  • Crystallography & Structural Chemistry (AREA)
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Abstract

This invention relates to a biological process for the preparation of shape and polymorph controlled mineral crystals by simple growth of roots from various seeds to a suitable aqueous metal ion.

Description

BIOLOGICAL PROCESS FOR THE PREPARATION OF MINERAL CRYSTALS USING PLANT SEEDS
Field of the invention This invention relates to a biological process for the preparation of mineral crystals using seeds. More particularly it relates to the preparation of size, shape and polymoφh controlled mineral crystals by simple growth of roots from various seeds in a suitable aqueous solution of a metal ion. Still more it relates to a biological process for the preparation of mineral crystals by the reaction of suitable electrolyte solution with carbon dioxide generated during the root growth from the seed. Still it relates to a biological process for the synthesis controlled mineral crystals by the proteins secreted during the root growth from the seeds that are responsible for the size, shape and polymoφh control of desired mineral crystals. It relates to a method for producing shape, size and polymoφh controlled mineral crystals such as in the case of calcium carbonate (CaCO3) where spherical vaterite crystals(most unstable polymoφh of (CaCO3) were obtained at room temperature, strontium carbonate (SrCO3), barium carbonate (BaCO3) by the natural growth of roots from the seeds. Shape control as well as polymoφh control of minerals crystals can be obtained by using root growth from different seeds. The shape controlled particles formed by this process can be used in numerous technological and medical applications, e.g., as advanced ceramics, catalysts, filler materials, sensors, semiconductors, pigments, can be used in plastic industries, paper industries and many others. Background and prior art Biological and materials synthesis and transformation are one of the core industries of world economy. Various techniques have been developed for large-scale generation of inorganic materials of controllable structure and size, some based on physical and some on chemical principles. Numerous substances are synthesized using processes that require non-ambient temperatures and/or non-ambient pressures that require capital-intensive equipment. Methods that can produce useful chemicals and materials at conditions closer to ambient conditions and use simple equipments are economically, ecologically and environmentally more desirable. Significant research efforts have been devoted for nanostructure processing as a means to achieve materials having commercial requirements in areas as diverse as electronics, pigments, cosmetics, ceramics and medical industries, (Mann et al., Nature., 1996, 382, 313).
Langmuir monolayers have been shown to induce oriented crystallization from solution of proteins (Uzgiris and Kornberg et al Nature., 1983, 301, 125; Ahlers et al Thin Solid Films., 1989, 180, 93) and other organic and inorganic compounds (Landau et al Nature., 1985, 318, 353). Mann and co-workers have studied the oriented crystallization of CaCO3 under monolayers of stearic acid (Mann et al, Nature., 1988, 334, 692; Mann et al Nature., 1988, 532, 119).
In biomimetic template such as self assembled monolayers (SAMs), Aizenberg, Black and Whitesides have shown that orientational match between carboxylate ions in SAMs and carbonate ions in the calcite nucleating phase is more important (Aigenberg et al, J. Am. Client. Soc. 1999, 121, 4500). This often leads to the oriented growth of CaCO crystals on surfaces such as terminally functionalized SAMs supported on metal films. (Kuther et al Chem. Eur. J. 1998, 4, 1834; Aigenberg et al, J. Am. Chem. Soc.1999, 121, 4500). Travaille et al. have shown interesting hexagonal organization of highly oriented calcite crystals on Au (111) films covered by a monolayer of 16-mercaptohexadecanoic acid (Travaille et al Adv. Mater. 2002, 14, 492). Dormers et al. have demonstrated the use of a shape persistent polymeric crystallization template [poly (L-isocyanoalanyl-D-alanine)] in the growth of calcite wherein crystal growth was influenced both by nucleation and adsoφtion processes (Dormers et al J Am. Chem. Soc. 2002, 124, 9700).
' US patent no. 6,325,987 provides a method for production of minerals in which uniformly sized and shaped particles of metal salts are provided comprised of one or more metal cations in combination with one or more simple oxoacid anions and a general method for the controlled precipitation of said metal salts from aqueous solutions. US patent no. 6,383,282 provides a method of pseudophasic extraction method for the separation of minerals which is a aqueous-based extraction method for the separation and recovery of ultra-fine mineral particles. The process operates within the pseudo phase region of the conventional aqueous biphasic extraction system where a low-molecular- weight, water soluble polymer alone is used in combination with a salt and operates within the pseudo-biphase regime of the conventional aqueous biphasic extraction system.
US patent no. 6,416,682 provides a method of producing synthetic crystals (typically minerals) or comparable inorganic compounds by reactions of metal salts and metal oxyhydroxides under near-critical, critical or supercritical solvent conditions. US patent no. 6,568,537 provides a method for the flotation of useful minerals, comprising a frother based on dimethyl (isopropenylethynyl) carbinol and a collector, the frother, for improving the technological flotation characteristics, having the following chemical composition, in wt.%: dimethyl (isopropenylethynyl) carbinol, 95.0-98.0; tetramethylbutynediol, 0.1-1.5; diisopropenylacetylene, 0.1-1.0; 2,5-dimethyl-l,4- hexadien-3-one, 1.5-2.5.
All publications and patents mentioned in the above specification are herein incoφorated by references. While in the foregoing specification, this invention has been described in relation to certain preferred embodiments thereof and many details have been set forth for puφose of illustration, it will be apparent to those skilled in the art that the invention is susceptible to additional embodiments and that certain of the details described herein can be varied considerably without departing from the basic principles of the invention.
Object of the invention
The main object of the invention is to provide a biological process for the preparation of mineral crystals, which are user friendly.
It is another object of the invention to provide a process for the preparation of shape, size and polymoφh controlled mineral crystals that are environmental friendly.
It is yet another object of the invention to provide an economic and efficient process for the preparation of shape, size and polymoφh controlled mineral crystals. These and other objects of the invention are achieved by the process of the invention, which uses a biological method for the preparation of shape, size and polymoφh controlled mineral crystals.
Summary of the invention
The present invention provides a biological process for the preparation of mineral crystals, which comprises growing of roots from surface sterilized seeds to an aqueous metal salt solution at a temperature in the range of 20 to 35°C for 1 to 5 days to obtain the respective mineral crystals of respective metal carbonates.
Description of the invention
Accordingly, the invention relates to a biological process for the preparation of shape and polymoφh controlled mineral crystals by simple growth of roots from various seeds to a suitable aqueous metal ion. More particularly it relates to a biological process for the preparation of mineral crystals by the reaction of suitable electrolyte solution with carbon dioxide generated during the root growth from the seed. Still it relates to a biological process for the synthesis mineral crystals controlled by the proteins secreted during the root growth from the seeds that are responsible for the size, shape and polymoφh control of desired mineral crystals. More particularly it relates to a method for producing shape, size and polymoφh controlled mineral crystals such as calcium carbonate (CaCO3), strontium carbonate (SrCO3), barium carbonate (BaCO3) by the natural growth of roots from the seeds. Shape control as well as polymoφh control of minerals crystals can be obtained by using root growth from different seeds.
In one of the embodiment of the present invention, the process provides a biological process for the preparation of mineral crystals, which comprises growing of roots from surface sterilized seeds to an aqueous metal salt solution at a temperature in the range of 20 to 35°C for 1 to 5 days to obtain the respective mineral crystals of respective metal carbonates. of the embodiments of the present invention, the seeds used are Cicer arietinum, Pisum sativum, Lycopersicon esculentum, Oryza sativa, Triticum aestivum, Coriandrum sativum, Papaver somniferum, Ocimum basilicum, Trigonella foenum-graecum, Vigna radiata, Zea mays, Hordeum vulgare, Brassica campestris, Vigna mungo, Vigna unguiculata, Ricinus communis, Solanum melongena, ,Paspalum scrobiculatum, Raphanus sativus, Gossypium herbaceum, Helianthus annus, Linum usitatissinum, Luffa cylindrica, Cucumis sativus, Cymbopogon flexuosus, Daucus carota, Abelmoschus esculentus, Anethum graveolens, Cajanus cajan, Capsicum annuum, Carica papaya, Datura innoxia, Catharanthus roseus, Spinacia oleracea, Citrullus vidgaris.
In another embodiment of the invention, the reaction of the CO2 generated during root growth and the suitable electrolyte solution is carried out in water. The process of the invention is described herein below with reference to the following examples, which are illustrative and should not be construed as limiting the scope of the invention.
Brief description of the Table Table 1 : XRD pattern of polymorph of CaCO3 EXAMPLES EXAMPLE 1
This example illustrates the preparation of CaCO3 crystals by using the seeds of chick pea (Cicer arietinum). The seeds were washed with sterile distilled water and then soaked for 45 min. in water. After soaking, seeds were surface sterilized with Na-hypochlorite solution for 3 mins, then washed well with sterile distilled water and spread on moistened Whatman filter paper in autoclaved Petridish (250 mm diameter). Closed Petridish was placed in the dark, at 25-26°C, for 3 days for germination. The germinated seeds were placed on moistened filter paper support in autoclaved Erlenmeyer flask containing 100 ml sterile 10"2 M aqueous CaCl2 solution for 5 to 10 days. The Erlenmeyer flask was then plugged with cotton and incubated 25-26°C. The bio-transformation was routinely monitored by periodic sampling of aliquots (10 ml) under sterile conditions for analysis. The sample was characterized by X-ray diffraction (XRD) measurement. The XRD results shown in table below obtained correspond to that of variety polymoφh of CaCO3. Table 1
Figure imgf000007_0001
EXAMPLE 2
This example illustrates the preparation of CaCO3 crystals by using the seeds of Vigna radiata seeds were washed with sterile distilled water and then soaked for 45 min. in water. After soaking, seeds were surface sterilized with Na-hypochlorite solution for 3 mins, then washed well with sterile distilled water and spread on moistened Whatman filter paper in autoclaved Petridish (250 mm diameter). Closed Petridish was placed in the dark, at 25-26 °C, for 3 days for germination. The germinated seeds were placed on moistened filter paper support in autoclaved Erlenmeyer flask containing 100 ml sterile 10"2 M aqueous CaCl2 solution for 5 to 10 days. The Erlemneyer flask was then plugged with cotton and incubated 25-26°C. The bio transformation was routinely monitored by periodic sampling of aliquots (10 ml) under sterile conditions for analysis. EXAMPLE 3 This example illustrates the preparation of CaCO crystals by using the seeds of Pisum satium seeds were washed with sterile distilled water and then soaked for 45 min. in water. After soaking, seeds were surface sterilized with Na-hypochlorite solution for 3 mins, then washed well with sterile distilled water and spread on moistened Whatman filter paper in autoclaved Petridish (250 mm diameter). Closed Petridish was placed in the dark, at 25-26 °C, for 3 days for germination. The germinated seeds were placed on moistened filter paper support in autoclaved Erlenmeyer flask containing 100 ml sterile 10"2 M aqueous CaCl2 solution for 5 to 10 days. The Erlenmeyer flask was then plugged with cotton and incubated 25-26 °C. The bio transformation was routinely monitored by periodic sampling of aliquots (10 ml) under sterile conditions for analysis. EXAMPLE 4
This example illustrates the preparation of SrCO crystals by using the seeds of Chick pea (Cicer arietinum) seeds were washed with sterile distilled water and then soaked for 45 min. in water. After soaking, seeds were surface sterilized with Na-hypochlorite solution for 3 mins, then washed well with sterile distilled water and spread on moistened Whatman filter paper in autoclaved Petridish (250 mm diameter). Closed Petridish was placed in the dark, at 25-26 °C, for 3 days for germination. The germinated seeds were placed on moistened filter paper support in autoclaved Erlenmeyer flask containing 100 ml sterile 10" M aqueous SrCl2 solution for 5 to 10 days. The Erlemneyer flask was then plugged with cotton and incubated 25-26°C. The bio transformation was routinely monitored by periodic sampling of aliquots (10 ml) under sterile conditions for analysis. EXAMPLE 5 This example illustrates the preparation of BaCO crystals by using the seeds of Chick pea (Cicer arietinum) seeds were washed with sterile distilled water and then soaked for 45 min. in water. After soaking, seeds were surface sterilized with Na-hypochlorite solution for 3 mins, then washed well with sterile distilled water and spread on moistened Whatman filter paper in autoclaved Petridish (250 mm diameter). Closed Petridish was placed in the dark, at 25-26 °C, for 3 days for germination. The germinated seeds were placed on moistened filter paper support in autoclaved Erlemneyer flask containing 100 ml sterile 10" 3 M aqueous BaCl2 solution for 5 to 10 days. The Erlenmeyer flask was then plugged with cotton and incubated 25-26°C. The bio transformation was routinely monitored by periodic sampling of aliquots (10 ml) under sterile conditions for analysis. Advantages of the process claimed in the present invention are: 1. The main advantage of the present invention is the use of natural growth of seeds under aqueous medium. 2. Another major advantage of the present invention is that the mineral crystals formed are quite stable in the aqueous solution. 3. Another advantage of the present invention is that the mineral crystals formed are of highly controlled in shape.
4. Another major advantage of the present invention is that different polymoφhism of the suitable mineral can be achieved by using suitable seeds. 5. Uniform size control
6. Large scale synthesis is possible
7. Ambient experimental conditions
8. Cost effective/Economical system for the industry
9. High stability of the particles formed 10. The method of the invention is also enviromnentally friendly and simple.

Claims

We claim:
1. A process for the preparation of mineral crystals, the said process comprising germinating seeds and growing the roots thus germinated in an aqueous solution containing one or more metal salts at a temperature in the range of 20 to 35°C for a period of 2 to 7 days to obtain the mineral crystals of respective metal carbonates.
2. A process as claimed in claim 1, wherein in step (a) the seeds used are selected from a group consisting of Cicer arietinum, Pisum sativum, Lycopersicon esculentum, Oryza sativa, Triticum aestivum, Coriandrum sativum, Papaver somniferum, Ocimum basilicum, Trigonella foenum-graecum, Vigna radiata, Zea mays, Hordeum vulgare, Brassica campestris, Vigna mungo, Vigna unguiculata, Ricinus communis, Solanum melongena, Paspάlum scrobiculatum, Raphanus sativus, Gossypium herbaceum, Heliandius annus, Linum usitatissinum, Luffa cylindrica, Cucumis sativus, Cymbopogon flexuosus, Daucus carota, Abelmoschus esculentus, Anethum graveolens, Cajanus cajan, Capsicum annuum, Carica papaya, Datura innoxia, Catharanthus roseus, Spinacia oleracea and Citrullus vulgaris.
3. A process as claimed in claim 1, wherein the seeds are washed and sterilized prior to germination.
4. A process as claimed in claim 3, wherein the seeds are sterilized using sodium hypochlorite solution.
5. A process as claimed in claim 4, wherein the seeds are sterilized by treating the same with sodium hypochlorite solution for a time period in the range of 2-4 minutes.
6. A process as claimed in claim 1, wherein the seeds are germinated in a dark room at a temperature in the range of 20 to 30°C for a time period in the range of 2 to 5 days.
7. A process as claimed in claim 1, wherein the metal salt used is carbonate salts of Ca2+, Sr2+ and Ba2+.
8. A process as claimed in claim 7, wherein the metal salts used selected from a group comprising CaCO3, SrCO3, BaCO3 and their mixtures thereof.
9. A process as claimed in claim 8, wherein the concentration of metal ions in the aqueous solution is in the range of 0.001 to 1 M.
10. A process as claimed in claim 1, wherein the crystal formed are obtained by filtration and drying.
PCT/IB2003/006194 2003-12-27 2003-12-27 Biological process for the preparation of mineral crystals using plant seeds WO2005066350A1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5446021A (en) * 1988-03-01 1995-08-29 Nippon Zoki Pharmaceutical Co., Ltd. Agricultural and horticultural compositions inducing resistance in plants against salt- and water-stress
US20020083487A1 (en) * 1998-12-22 2002-06-27 Atsunori Fukuda Sodium/proton antiporter gene

Patent Citations (2)

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