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БИОХИМИЯ, БИОТЕХНОЛОГИЯ И ЭКОЛОГИЯ
UDC 577.11
I. Rau, F. Kajzar, G. Zaikov,
Kh. Abzaldinov
BIOPOLYMERS FOR APPLICATION IN PHOTONICS. PART 1
Keywords: Deoxyribonucleic acid, DNA, collagen, DNA-CTMA complex, linear optical properties, nonlinear optical properties, photoluminescence, photo-thermal stability, optical damage threshold, thin films.
Possibilities of utilization of biopolymers, and particularly of the deoxyribonucleic acid (DNA) are reviewed and discussed. The ways of their functionalization with photoresponsive molecules to get desired properties are described and illustrated on several examples as well as the processing of materials into thin films. Their room - and photothermal stability, studied by spectroscopic techniques is reported, together with optical damage thresholds. Physical properties, and more particularly linear, nonlinear and photoluminescent properties of obtained materials are also reviewed and discussed.
Ключевые слова: дезоксирибонуклеиновая кислота, ДНК, коллаген,комплекс ДНК-CTMA, линейные оптические свойства, нелинейные оптические свойства, фотолюминесценция, фототермическая стабильность, порог оптического разрушения,
тонкие пленки.
Рассматриваются и обсуждаются возможности использования биополимеров, и в частности дезоксирибонуклеиновой кислоты (ДНК). На нескольких примерах дается описание способов их функционализации фоточувствительными молекулами для получения желаемых свойств, а также при переработке материалов в тонкие пленки. Спектроскопическими методами изучена стабильность при комнатных условиях, фототермическая стабильность, а также пороги оптических разрушений. Также рассматриваются и обсуждаются физические свойства, и, в частности, линейные, нелинейные и фотолюминесцентные свойства полученных материалов.
1. Introduction
In last 30 years time the synthetic polymers have found large applications in almost each domain of human activity, and particularly in construction, car industry, medicine, textile and more recently in advanced technologies. These polymers are obtained principally from coal and from oil by chemical transformation and synthesis. However, due to the fact that the coal and oil resources are limited on one hand and contribute to an important pollution of the planet on the other the scientists turns their attention to nature produced biopolymers. Indeed, the decay time for a thin foil of polyethylene (PET), used largely in fabrication of plastic bottles, is of 5 - 10 years. Also the largely used polystyrene (PS) decomposes in 50 years, low-density polyethylene (LDPE) in 500 - 1000 years. Polypropylene (PP), used in clothing and rope fabrication, practically does not degrade [1]. The fabrication of some polymers, like polyvinyl chloride (PVC), used largely in construction and in fabrication of toys is done with the use of toxic dioxin. Its degradation is associated with the production of unhealthy subproducts. These facts explain well the already mentioned switch of the scientists interest to natural biopolymers, originating from renewable resources and biodegradable.
One of these polymers which attracted recently some interest is chitosan which is a polysaccharide, occurring in the exoskeleton of invertebrates and in their internal structures. It was shown that it has some interesting optical properties [2, 3]. There are two biopolymers produced in a very large amount by nature which are the deoxyribonucleic acid (DNA) and
collagen. Both are biodegradable, abundant and can be obtained from, e.g., the waste of food producing industry.
DNA, called also "molecule of live", is present in all living species, being responsible for its development and heritage not only of humans and animals but also of the vegetal ones. Since the discovery of its molecular structure by Watson and Crick [4, 5] (cf. Figure 1) in 1953 the deoxyribonucleic acid (DNA) attracted a lot of interest of biologists, chemists, and later, of physicists.
phosphore
suc^r-phosphate
backbone
hydrogen
major groves
Fig. 1 - Chemical structure of a segment of DNA molecule (adapted from [6])
H N
Adenine (A)
NHo
Guanine (G) 0
N H
N
A
O
NH
Cytosine (C)
N H
Thymine (T)
O
Indeed, this supramolecule exhibits a peculiar double helix structure, consisting of stacked base pairs of molecules arranged as rungs of the ladder. The pairs consist always of adenine with thymine and of guanine with cytosine. The two helix backbones are made of sugar and phosphate groups, joined internally by the ester bonds. The base pairs are linked together by the strong hydrogen bonds. Because the outside groups are phosphates, the DNA macromolecule presents a net negative charge, compensated by sodium ions, which are non-localized counter ions. They can move freely along the macromolecular chain surface [7].
H
Guanine
Cytosine
As it was found originally by X Ray studies by Watson and Crick the pitch of the helix is of 3.4 nm, its diameter of 1 nm respectively and the distance between two neighbouring nucleotides of 0.34 nm (cf. Figure 1). In solution these dimensions may be a little different as reported by Mandelkern et al [8], ranging from 2.2 to 2.6 nm for the helix radius, 3.3 nm for the pitch, and 0.34 nm for the distance between two nucleotides.
The double stranded helix form major and minor grooves, wide, respectively, of 2.2 nm and 1.2 nm [9]. Their presence is important for the functionalization of DNA as it will be discussed later.
The size of DNA depends on the level of development of a given specie. Usually it is expressed in the number of base pairs (bp) and spans from several tens of bp, as for Escherichia coli bacteria (76bp), to 3 000 Mbp for Human DNA [10]. There exist a lot of programs available on internet which transform the base pairs number into molecular mass (Daltons). A base pair has molecular mass of about 660 Da.
One of the important arguments used in favour of biopolymers for replacing the synthetic polymers in photonics and in electronics, and particularly by DNA, is its abundance and renewability. DNA is usually obtained from the waste produced by food processing industry. Thus it can be cheap. In contrary to synthetic polymers, if not protected, biopolymers are biodegradable. Thus their use should permit to decrease the pollution by slowly decomposing synthetic polymers. This is comforted by the present scientific policy related to the humanity problem of creating a sustainable society with durable development, disposing renewable resources and minimising the environment pollution.
Besides the above mentioned advantages, there are other important properties of DNA, which are in favour of its in photonics and in electronics, as it will be shown and discussed later in this paper. It concerns, in particular the versatility, thin film processability and the possibility of tailoring optical and electrical properties by DNA functionalization. Its specific double strand helical structure, with minor and major groves, provides a large free volume for doping molecules as well as a good protection against photo thermal degradation.
Another potentially very interesting biopolymer is collagen. Its name originates from Greek word kola meaning glue. It was indeed used as glue in antic times. This biopolymer is the most abundant in human and animal organisms supramolecule, making ca 25 % of all their proteins, i.e. 5% of their mass. It plays an important role in assuring connectivity of mammals tissues [11] and in their structuring. Its molecular mass is of ca 325 000 Da. A collagen fiber with 1 mm diameter may withstand a 10 kg load.
The collagen molecule is composed of three associated alpha polypeptide chains, as shown in Figure 4, linked by hydrogen bonds between hydroxylysine and l'hydroxyproline and by covalent bonds. An alpha chain is constituted of 1055 amino acids. They may combine in different ways and form a large variety of different collagens. Each of them is characterized by an appropriate structure and exerts a particular role in a given organ. For example collagen I is present in cornea, skin and bones while collagen III can be found in the cardiovascular system.
The building unit of collagen is the tropocollagen. It is a noncentrosymmetric molecule, exhibiting second harmonic generation as observed by several research groups. The length of tropocollagen is of ca 280 nm and the diameter of 1.5 nm, respectively. The already mentioned constituent elements amino
acids comprise glycine, proline, hydroxylysine and 4-hydroxyproline (cf. Figure 2). There are several types of molecular chains, which are composed of repetitive sequences of these amino acids. Glycine is repeated throughout the molecule. The carbohydrates are attached to hydroxylysine. The cohesion of tropocollagen is ensured by strong hydrogen bonds between glycine and hydroxyproline (Figure 2).
a b
Fig. 2 - Chemical structure of collagen (a) and of tropocollagen (b)
The deoxyribonucleic acid exhibits little n electron conjugation which is interesting for application in photonics. It is mainly to the presence of double C=C bands, in nucleobases. Such conjugation is absent in collagen. Therefore to obtain desired properties necessary for practical applications both biopolymers
In this Chapter we review and discuss the results of our recent studies on functionalization, photo -thermal stability of collagen and DNA and collagen based complexes, together with stability in high intensity laser beams.
2. Materials
The deoxyribonucleic acid we are using in our studies was purchased at Ogata Photonics Laboratory, Chitose, Hokkaido, Japan. It is obtained from the waste produced in salmon processing [12, 13], particularly from roe and milt. Frozen roe and milt are first grinded. Then the grinded product is homogenized. Then starts the important and difficult process of protein elimination. The homogenized product is treated with enzymes DNA, dissolved in water and decolorized with active carbon. Finally the product is filtered and freeze-dried. The most delicate and difficult step in purification process is the separation of proteins. The final product contains usually ca 98 % of DNA and ca 2% of proteins ([13]).
Collagen is also obtained from the waste produced in meat processing. It is usually obtained from skin and bones of animals, principally such as beefs and porcs as well as from fish [14, 15]. The collagen used in our study was obtained at University Politehnica of Bucharest from beef skin using an original procedure described in Refs. [16, 17]. DNA is known to denature at around 90 °C, changing its helical structure from double stranded to single stranded [18, 19], limiting in
this way the temperature range of applicability. Also thin film processing and water solubility only limits the possible range of its applications.
Collagen can be irreversibly hydrolyzed giving gelatine, which is largely used in food industry.
3. Functionalization
As already mentioned pure DNA and collagen represent a limited interest for applications in, particularly, photonics. They exhibit low n electron conjugation, which is principally present in DNA only owing to the -C=C- conjugated bonds in nucleobases.
Pure DNA has a limited potential for applications in photonics. This biopolymer is soluble in water only, a solvent which doesn't belong to the preferred ones in the device fabrication technologies, although some electronic devices containing water were already described [20, 21]. Also a week n electron conjugation, only in phenyl rings, provides limited hyperpolarizabilities to this compound. Therefore the only possible practical use of this biopolymer in photonics is as an optically inactive material, except if its chirality can be exploited in some ways.
(c IMA)
iljijssxlifeisjljsl ammonium diloride (BDCA)
y—CHj-N—(CHj^i^CHa
(C BDA).
H3c^ cr O^l*---s^-CH,
DNA is an anionic polyelectrolyte [22, 23] with Na+ ion being a counter ion. Therefore the first possible approach to functionalize is through the electrostatic interaction by substituting Na+ by a positively charged molecule, which will be bond to the DNA helix by the electrostatic force, changing in this way its properties. Several approaches were done in this direction. A significant DNA material improvement was obtained by functionalizing it chemically with ionic liquids, as shown by Iijiro & Okahata [24], Okahata [25, 26], Serguev et al [27], Kimura et al [28], and more particularly by Ogata and coworkers from Chitose Institute of Technology [29-41]. They have shown that the counterion Na+ can be substituted by an amphiphilic cation, leading to a more stable compound, soluble in polar organic solvents and generally insoluble in water. They used several cationic surfactants which react with DNA via electrostatic forces and they succeeded in making several stable complexes using surfactants such as: cetyltrimethylammonium (CTMA) (Wang et al [42] and an aromatic one the benzyldimethylammonium (CBDA) [37] Watanyuki], whose chemical structures are shown in Figure 6. Recently some other surfactants
were proposed, such as aromatic ones: benzalkonium chloride (BA), and a linear amphiphilic one didecyldimethyl ammonium chloride (DDCA). The complexes formed with the new surfactants are soluble in a larger number of solvents making possible DNA functionalization with a greater class of molecules.
Figure 3 shows schematically the reaction of a surfactant (with a counterion, usually Cl- or ClO4-) with DNA (counterion Na+). As result of this reaction a stable DNA-surfactant complex is formed, which precipitates in reaction solvent (water) and can be easily recovered. The resulting from the reaction sodium ion forms a salt with the surfactant counterion which remain in water. The DNA surfactant complexes are well stable. Their thermal degradation takes place at around 230 °C ([43-45]).
Intercalation consists on introduction of a doping molecule between nucleobase pairs stacks, as shown in Figure 4 (a).
Fig. 3 - Electrostatic interaction between DNA and surfactant leading to the formation of a stable complex (courtesy of J. G. Grote, UA Air Force Wright Patterson Research Labs, Dayton, OH, USA)
As already mentioned DNA undergoes a denaturation process when heated to 90°C. It consists on transformation from double strand to single strand helix. In contrary, the DNA - surfactant complex show a better stability, maintaining its double stranded helical structure to temperatures overpassing 100 °C [13], what is sufficient for majority of practical applications.
Functionalization of DNA with the above cited surfactants does not provide them the required in photonics photosensitivity, as the molecules used show also a little (aromatic surfactants) or none (amphiphilic surfactants) n electron delocalization. Figure 4 compares optical absorption spectra of thin films of DNA with those made of two complexes: All show absorptions around 260 nm, which are due to conjugated n electrons of nucleobases and of phenyl ring in the case of aromatic surfactants. Therefore it is necessary to functionalize the biopolymer or its complex with a surfactant with a photosinsitive molecule. This can be done in three different ways:
1. intercalation,
2. random doping, as in the case of synthetic polymers,
3. doping through molecules inclusion in minor or major groves,
4. covalent attachement to DNA chains.
Intercalation Groove binding
a b
Fig. 4 - Intercalation (left) and groove binding (right) of chromophores in DNA [49]
As the space is limited, only small, ring type, flat molecules can intercalate. A large n electron overlap between the doping molecules and the nucleobase pairs is expected in this case.
Recently Pawlik et al [46] (see also Refs. [47, 48]) have proposed another intercalation mechanism for DNA - surfactant complexes they proposed to call "semi-intercalation". In that cas the doping molecules are partly inserted between the surfactant molecules for DR1 in DNA - CTMA matrix.
Thus the dopants do nt bind directly to the DNA backbone but are separated from, keeping in this way a larger conformational mobility.The Monte Carlo simulation calculations performed using this model allowed to explain the photochromic properties of DNA-CTMA-DR1complex.
They reproduced accurately the main experimental results of laser dynamic inscription of diffraction gratings in this photochromic material: short response time, low diffraction efficiency, single-exponential kinetics and flat wavelength dependence. It allowed also to explain also the origin of memory effect upon light excitation observed in DNA-CTMA-DR1 complexes.
The simplest way of DNA or DNA - surfactant functionalization is by making solid solutions, as it is frequently done with synthetic polymers, and as it was proposed originally by Havinga and Pelt [50] to improve electroluminescent properties of some organic dyes. This is done in solution, while existence of a
common solvent is required. It is difficult to be done with DNA and collagen as these biopolymers are soluble in water only. The DNA - surfactant complexes are insoluble in water and soluble, depending on surfactant used, in a large variety of solvents. Indeed, lot of different complexes, particularly DNA - surfactant -photosensitive chromophore complexes were successfully made in this way [see e.g. Grote [13], Rau et al [51], Derkowska et al [52]).
Some, particularly linear molecules, like so called Hoechst molecule 33258 fits into the minor or major groves of DNA, without a Van der Walls contact.
H3C—NH N
3 CI
Hoechst molecule 33258 (CjsHjöNöR) chloride
Binding of Hoechst molecule 33258 (C25H26N6R) chloride to the minor grove of DNA
This type of molecules, if showing photoluminescence, is used to stain DNA, are important and find large practical applications, particularly in criminology.
There are several attempts to attach covalently the photosensitive molecules to DNA by using different synthetic methodologies. In particular a lot of efforts was done with planar molecules, such as porphyrins through a direct modification of nucleobases [54] or using acyclic linkers [55]. Attempts were also done in replacing nucleobases in the middle of the helix by porphyrin molecules [56] for solar energy conversion [57, 58] as well as in photodynamic therapy applications [59].
Recently Stephenson et al [60, 61] reported the synthesis of ß - pyrrolic-functionalised porphyrins and their covalent attachment to 2'-deoxyuridine and DNA. The authors observed a better thermal stabilisation of parallel porphyrin-modified triplex-forming oligonucleotide strands, while the anti-parallel duplexes were destabilised.
4. Thin film processing
A lot of practical applications of photonic and electronic materials are expected to be done in thin films.
Therefore the ability of processing of given materials into this form is important. In the present case all discussed here biopolymers: DNA, DNA -chromophore DNA - surfactant, DNA - surfactant -
chromophore as well as collagen and collagen -chromophore. Good optical quality thin films can be obtained by usual solution casting techniques. For DNA - CTMA we use commonly butanol as solvents. But some other, like methanol, ethanol, isopropanol, cyclohexanone and methyl isobutyl_ ketone can be also used. For complexes with other surfactants more solvents can be used. Thin films of DNA-CTMA complex, obtained by spin coating, were found to be partly ordered, with measured anisotropy of refractive index [62].
Some examples of thin films deposited by spinning on glass substrates are given in Figure 10 (b-c). An AFM picture of collagen thin films, showing the already mentioned fibrilar structure of this biopolymer is shown in Figure 5.
Fig. 5 - AFM image of the collagen thin films surface. The mentioned fibrilar structure is well seen
7. Conclusions
In this Chapter we review and discuss the recent work on two biopolymers: collagen and deoxyribonucleic acid in view of their application in photonics. Both are abundant, renewable, biodegradable and nature fabricated macromolecules. They can be obtained from the waste produced in food processing industry. That used in our studies originates from the waste produced in salmon processing industry. Thus they can be cheap and the renewable resources are practically unlimited. It can be used, at least partly, to replace synthetic polymers as matrix for photosensitive molecules, offering an interesting, ecologically friendly, alternative material for applications in photonics and in electronics.
Owing to its peculiar double stranded helical structure DNA offers more than synthetic polymers. Particularly there is a larger free volume offering faster conformational processes, as discussed here, and at the same time a better stability of embedded molecules. Indeed, as shown by described and discussed here the recent photothermal degradation studies performed on a series of DNA based complexes significantly larger first order decay constants for several chromophores embedded in collagen or DNA matrices than when these molecules are dissolved in the commonly used synthetic polymers like the polymethyl methacrylate (PMMA). Also, DNA exhibits a higher optical damage threshold.
DNA can be functionalized with surfactants, leading to a temperature stable material, processable into good optical quality thin films by solution casting techniques. The structure of DNA and the ionic environment it offers changes the physico-chemical properties of embedded active molecules in a favourable way as shown and discussed in this paper. Different doping mechanisms were indicated. The richness of the possible functionalization of DNA gives possibility of obtaining an important class of materials with new properties and new functionalities. They may be cheap, as obtained from the waste produced in the food processing industries and they are environmentally friendly, as already mentioned. As photoactive materials natural chromophores, like anthocyanines, can be, perspectively, used too [63]. We note too that the liquid crystalline phase was also isolated in DNA and investigated [64] as well as in a DNA-surfactant complex [65].
Acknowledgements
The authors acknowledge the financial support of Romanian Ministry of Education, Research, Youth and Sports, through the UEFISCDI organism, under Contract Number 279/7.10.2011, Code Project PN-II-ID-PCE-2011-3-0505.
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© I. Rau, F. Kajzar - Faculty of Applied Chemistry and Materials Science, University Politehnica Bucharest, Bucharest, Romania; G. Zaikov, Kh. Abzaldinov - Kazan National Research Technological University, Kazan, Russia, [email protected].
