Abstract
The sub-nanometer scale provided by small angle neutron and X-ray scattering is of special importance to pharmaceutical and biomedical investigators. As drug delivery devices become more functionalized and continue decreasing in size, the ability to elucidate details on size scales smaller than those available from optical techniques becomes extremely pertinent. Information gathered from small angle scattering therefore aids the endeavor of optimizing pharmaceutical efficacy at its most fundamental level. This chapter will provide some relevant examples of drug carrier technology and how small angle scattering (SAS) can be used to solve their mysteries. An emphasis on common first-step data treatments is provided which should help clarify the contents of scattering data to new researchers. Specific examples of pharmaceutically relevant research on novel systems and the role SAS plays in these studies will be discussed. This chapter provides an overview of the current applications of SAS in drug research and some practical considerations for selecting scattering techniques.
References
Akiba I, Terada N, Hashida S, Sakurai K, Sato T, Shiraishi K, Yokoyama M, Masunaga H, Ogawa H, Ito K, Yagi N (2010) Encapsulation of a hydrophobic drug into a polymer-micelle core explored with synchrotron SAXS. Langmuir 26(10):7544–7551
Alexander S, Cosgrove T, de Vos WM, Castle TC, Prescott SW (2014) Aggregation behavior of polyisoprene–pluronic graft copolymers in selective solvents. Langmuir 30(20):5747–5754
Almgren M, Garamus VM, Asakawa T, Jiang N (2007) Contrast variation SANS investigation of composition distributions in mixed surfactant micelles. J Phys Chem B 111(25):7133–7141
Bae JW, Lee E, Park KM, Park KD (2009) Vinyl sulfone-terminated PEG−PLLA diblock copolymer for thiol-reactive polymeric micelle. Macromolecules 42(10):3437–3442
Balgavý P, Dubničková M, Kučerka N, Kiselev MA, Yaradaikin SP, Uhríková D (2001) Bilayer thickness and lipid interface area in unilamellar extruded 1,2-diacylphosphatidylcholine liposomes: a small-angle neutron scattering study. Biochim Biophys Acta Biomembr 1512(1):40–52
Becker AL, Johnston APR, Caruso F (2010) Layer-by-layer-assembled capsules and films for therapeutic delivery. Small 6(17):1836–1852
Besanger TR, Easwaramoorthy B, Brennan JD (2004) Entrapment of highly active membrane-bound receptors in macroporous sol−gel derived silica. Anal Chem 76(21):6470–6475
Biggs S, Labarre M, Hodges C, Walker LM, Webber GB (2007) Polymerized rodlike micelle adsorption at the solid−liquid interface. Langmuir 23(15):8094–8102
Boetker J, Rades T, Rantanen J, Hawley A, Boyd BJ (2012) Structural elucidation of rapid solution-mediated phase transitions in pharmaceutical solids using in situ synchrotron SAXS/WAXS. Mol Pharm 9(9):2787–2791
Borchert U, Lipprandt U, Bilang M, Kimpfler A, Rank A, Peschka-Süss R, Schubert R, Lindner P, Förster S (2006) pH-induced release from P2VP−PEO block copolymer vesicles. Langmuir 22(13):5843–5847
Caruso F, Caruso RA, Möhwald H (1998) Nanoengineering of inorganic and hybrid hollow spheres by colloidal templating. Science 282(5391):1111
Chemelli A, Maurer M, Geier R, Glatter O (2012) Optimized loading and sustained release of hydrophilic proteins from internally nanostructured particles. Langmuir 28(49):16788–16797
Chen J, Kozlovskaya V, Goins A, Campos-Gomez J, Saeed M, Kharlampieva E (2013) Biocompatible shaped particles from dried multilayer polymer capsules. Biomacromolecules 14(11):3830–3841
Cho J, Hong J, Char K, Caruso F (2006) Nanoporous block copolymer micelle/micelle multilayer films with dual optical properties. J Am Chem Soc 128(30):9935–9942
Choi I, Malak ST, Xu W, Heller WT, Tsitsilianis C, Tsukruk VV (2013) Multicompartmental microcapsules from star copolymer micelles. Macromolecules 46(4):1425–1436
Ciriminna R, Fidalgo A, Pandarus V, Béland F, Ilharco LM, Pagliaro M (2013) The sol–gel route to advanced silica-based materials and recent applications. Chem Rev 113(8):6592–6620
Correa NM, Silber JJ, Riter RE, Levinger NE (2012) Nonaqueous polar solvents in reverse micelle systems. Chem Rev 112(8):4569–4602
Dao TPT, Fernandes F, Er-Rafik M, Salva R, Schmutz M, Brûlet A, Prieto M, Sandre O, Le Meins JF (2015) Phase separation and nanodomain formation in hybrid polymer/lipid vesicles. ACS Macro Lett 4(2):182–186
Decher G (2002) Polyelectrolyte multilayers, an overview. In: Multilayer thin films. Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, pp 1–46
Donath E, Sukhorukov GB, Caruso F, Davis SA, Möhwald H (1998) Novel hollow polymer shells by colloid-templated assembly of polyelectrolytes. Angew Chem Int Ed 37(16):2201–2205
Elsner N, Kozlovskaya V, Sukhishvili SA, Fery A (2006) pH-triggered softening of crosslinked hydrogen-bonded capsules. Soft Matter 2(11):966–972
Erel-Unal I, Sukhishvili SA (2008) Hydrogen-bonded multilayers of a neutral polymer and a polyphenol. Macromolecules 41(11):3962–3970
Espinosa-Dzib A, Chen J, Zavgorodnya O, Kozlovskaya V, Liang X, Kharlampieva E (2015) Tuning assembly and enzymatic degradation of silk/poly(N-vinylcaprolactam) multilayers via molecular weight and hydrophobicity. Soft Matter 11(25):5133–5145
Estrela-Lopis I, Leporatti S, Moya S, Brandt A, Donath E, Möhwald H (2002) SANS studies of polyelectrolyte multilayers on colloidal templates. Langmuir 18(21):7861–7866
Estrela-Lopis I, Leporatti S, Typlt E, Clemens D, Donath E (2007) Small angle neutron scattering investigations (SANS) of polyelectrolyte multilayer capsules templated on human red blood cells. Langmuir 23(13):7209–7215
Estrela-Lopis I, Leporatti S, Clemens D, Donath E (2009) Polyelectrolyte multilayer hollow capsules studied by small-angle neutron scattering (SANS). Soft Matter 5(1):214–219
Filippov SK, Chytil P, Konarev PV, Dyakonova M, Papadakis C, Zhigunov A, Plestil J, Stepanek P, Etrych T, Ulbrich K, Svergun DI (2012) Macromolecular HPMA-based nanoparticles with cholesterol for solid-tumor targeting: detailed study of the inner structure of a highly efficient drug delivery system. Biomacromolecules 13(8):2594–2604
Filippov SK, Franklin JM, Konarev PV, Chytil P, Etrych T, Bogomolova A, Dyakonova M, Papadakis CM, Radulescu A, Ulbrich K, Stepanek P, Svergun DI (2013) Hydrolytically degradable polymer micelles for drug delivery: a SAXS/SANS kinetic study. Biomacromolecules 14(11):4061–4070
Foglia F, Rogers SE, Webster JRP, Akeroyd FA, Gascoyne KF, Lawrence MJ, Barlow DJ (2015) Neutron scattering studies of the effects of formulating amphotericin B with cholesteryl sulfate on the drug’s interactions with phospholipid and phospholipid–sterol membranes. Langmuir 31(29):8042–8051
Fong WK, Hanley TL, Thierry B, Kirby N, Boyd BJ (2010) Plasmonic nanorods provide reversible control over nanostructure of self-assembled drug delivery materials. Langmuir 26(9):6136–6139
Gapiński J, Szymański J, Wilk A, Kohlbrecher J, Patkowski A, Hołyst R (2010) Size and shape of micelles studied by means of SANS, PCS, and FCS. Langmuir 26(12):9304–9314
Ghosh Chaudhuri R, Paria S (2012) Core/shell nanoparticles: classes, properties, synthesis mechanisms, characterization, and applications. Chem Rev 112(4):2373–2433
Glatter O (1980) Evaluation of small-angle scattering data from lamellar and cylindrical particles by the indirect transformation method. J Appl Crystallogr 13:577–584
Glatter O, Hainisch B (1984) Improvements in real-space deconvolution of small-angle scattering data. J Appl Crystallogr 17:435–441
Glatter O, Kratky O (1982) Small angle X-ray scattering. Academic, New York
Goodwin DJ, Sepassi S, King SM, Holland SJ, Martini LG, Lawrence MJ (2013) Characterization of polymer adsorption onto drug nanoparticles using depletion measurements and small-angle neutron scattering. Mol Pharm 10(11):4146–4158
Guinier A, Fournet G (1955) Small-angle scattering of X-rays. Wiley, New York
Hammond PT (2011) Engineering materials layer-by-layer: challenges and opportunities in multilayer assembly. AICHE J 57(11):2928–2940
Hammouda B (2010a) A new guinier porod model. J Appl Crystallogr 43:716–719
Hammouda B (2010b) Analysis of the beaucage model. J Appl Crystallogr 43:1474–1478
Hammouda B (2016) Probing nanoscale structures using neutron scattering. NIST NCNR distance learning course
Harris JM, Martin NE, Modi M (2012) Pegylation. Clin Pharmacokinet 40(7):539–551
Kharlampieva E, Sukhishvili SA (2006) Hydrogen-bonded layer-by-layer polymer films. J Macromol Sci Part C 46(4):377–395
Kharlampieva E, Kozlovskaya V, Sukhishvili SA (2009) Layer-by-layer hydrogen-bonded polymer films: from fundamentals to applications. Adv Mater 21(30):3053–3065
Kim MD, Dergunov SA, Richter AG, Durbin J, Shmakov SN, Jia Y, Kenbeilova S, Orazbekuly Y, Kengpeiil A, Lindner E, Pingali SV, Urban VS, Weigand S, Pinkhassik E (2014) Facile directed assembly of hollow polymer nanocapsules within spontaneously formed catanionic surfactant vesicles. Langmuir 30(24):7061–7069
Kozlovskaya V, Kharlampieva E, Erel I, Sukhishvili SA (2009) Multilayer-derived, ultrathin, stimuli-responsive hydrogels. Soft Matter 5(21):4077–4087
Kozlovskaya V, Baggett J, Godin B, Liu X, Kharlampieva E (2012a) Hydrogen-bonded multilayers of silk fibroin: from coatings to cell-mimicking shaped microcontainers. ACS Macro Lett 2012(1):384–387
Kozlovskaya V, Zavgorodnya O, Chen Y, Ellis K, Tse HM, Cui W, Thompson JA, Kharlampieva E (2012b) Ultrathin polymeric coatings based on hydrogen-bonded polyphenol for protection of pancreatic islet cells. Adv Funct Mater 22(16):3389–3398
Kozlovskaya V, Alexander JF, Wang Y, Kuncewicz T, Liu X, Godin B, Kharlampieva E (2014) Internalization of red blood cell-mimicking hydrogel capsules with pH-triggered shape responses. ACS Nano 8(6):5725–5737
Lagzi I, Wang D, Kowalczyk B, Grzybowski BA (2010) Vesicle-to-micelle oscillations and spatial patterns. Langmuir 26(17):13770–13772
Li H, Pang S, Wu S, Feng X, Mullen K, Bubeck C (2011) Layer-by-layer assembly and UV photoreduction of graphene-polyoxometalate composite films for electronics. J Am Chem Soc 133(24):9423–9429
Lisunova MO, Drachuk I, Shchepelina OA, Anderson KD, Tsukruk VV (2011) Direct probing of micromechanical properties of hydrogen-bonded layer-by-layer microcapsule shells with different chemical compositions. Langmuir 27(17):11157–11165
Liu F, Kozlovskaya V, Zavgorodnya O, Martinez-Lopez C, Catledge S, Kharlampieva E (2014) Encapsulation of anticancer drug by hydrogen-bonded multilayers of tannic acid. Soft Matter 10(46):9237–9247
Liu F, Kozlovskaya V, Medipelli S, Xue B, Ahmad F, Saeed M, Cropek D, Kharlampieva E (2015) Temperature-sensitive polymersomes for controlled delivery of anticancer drugs. Chem Mater 27(23):7945–7956
Löf D, Schillén K, Loh W, Olofsson G (2007) A calorimetry and light scattering study of the formation and shape transition of mixed micelles of EO20PO68EO20 triblock copolymer (P123) and nonionic surfactant (C12EO6). J Phys Chem B 111(21):5911–5920
Lu J, Choi S, Bates FS, Lodge TP (2012) Molecular exchange in diblock copolymer micelles: bimodal distribution in core-block molecular weights. ACS Macro Lett 1(8):982–985
Lu J, Bates FS, Lodge TP (2015) Remarkable effect of molecular architecture on chain exchange in triblock copolymer micelles. Macromolecules 48(8):2667–2676
Lu J, Bates FS, Lodge TP (2016) Addition of corona block homopolymer retards chain exchange in solutions of block copolymer micelles. Macromolecules 49(4):1405–1413
Luo G, Zhang Q, Castillo ARD, Urban V, O’Neill H (2009) Characterization of sol−gel-encapsulated proteins using small-angle neutron scattering. ACS Appl Mater Interfaces 1(10):2262–2268
Lutkenhaus JL, Hammond PT (2007) Electrochemically enabled polyelectrolyte multilayer devices: from fuel cells to sensors. Soft Matter 3(7):804–816
Lvov Y, Decher G, Moehwald H (1993) Assembly, structural characterization, and thermal behavior of layer-by-layer deposited ultrathin films of poly(vinyl sulfate) and poly(allylamine). Langmuir 9(2):481–486
Mandal SS, Bhaduri S, Amenitsch H, Bhattacharyya AJ (2012) Synchrotron small-angle x-ray scattering studies of hemoglobin nonaggregation confined inside polymer capsules. J Phys Chem B 116(32):9604–9610
Mariani G, Moldenhauer D, Schweins R, Grohn F (2016) Elucidating electrostatic self-assembly: molecular parameters as key to thermodynamics and nanoparticle shape. J Am Chem Soc 138(4):1280–1293
Matsusaki M, Akashi M (2009) Functional multilayered capsules for targeting and local drug delivery. Expert Opin Drug Deliv 6(11):1207–1217
Mattingly SJ, O’Toole MG, James KT, Clark GJ, Nantz MH (2015) Magnetic nanoparticle-supported lipid bilayers for drug delivery. Langmuir 31(11):3326–3332
Mjahed H, Porcel C, Senger B, Chassepot A, Netter P, Gillet P, Decher G, Voegel J-C, Schaaf P, Benkirane-Jessel N, Boulmedais F (2008) Micro-stratified architectures based on successive stacking of alginate gel layers and poly(l-lysine)-hyaluronic acid multilayer films aimed at tissue engineering. Soft Matter 4(7):1422–1429
Naruse K, Eguchi K, Akiba I, Sakurai K, Masunaga H, Ogawa H, Fossey JS (2009) Flexibility and cross-sectional structure of an anionic dual-surfactant wormlike micelle explored with small-angle x-ray scattering coupled with contrast variation technique. J Phys Chem B 113(30):10222–10229
Nguyen T-H, Hanley T, Porter CJH, Boyd BJ (2011) Nanostructured liquid crystalline particles provide long duration sustained-release effect for a poorly water soluble drug after oral administration. J Control Release 153(2):180–186
Nunes SP, Car A (2013) From charge-mosaic to micelle self-assembly: block copolymer membranes in the last 40 years. Ind Eng Chem Res 52(3):993–1003
Patterson JP, Kelley EG, Murphy RP, Moughton AO, Robin M, Lu A, Colombani O, Chassenieux C, Cheung D, Sullivan MO, Epps TH 3rd, O’Reilly RK (2013) Structural characterization of amphiphilic homopolymer micelles using light scattering, SANS, and cryo-TEM. Macromolecules 46(15):6319–6325
Paul A, Vicent MJ, Duncan R (2007) Using small-angle neutron scattering to study the solution conformation of N-(2-hydroxypropyl)methacrylamide copolymer−doxorubicin conjugates. Biomacromolecules 8(5):1573–1579
Pomposo JA, Perez-Baena I, Lo Verso F, Moreno AJ, Arbe A, Colmenero J (2014) How far are single-chain polymer nanoparticles in solution from the globular state? ACS Macro Lett 3(8):767–772
Remant Bahadur KC, Thapa B, Xu P (2012) pH and redox dual responsive nanoparticle for nuclear targeted drug delivery. Mol Pharm 9(9):2719–2729
Richter AG, Dergunov SA, Ganus B, Thomas Z, Pingali SV, Urban V, Liu Y, Porcar L, Pinkhassik E (2011) Scattering studies of hydrophobic monomers in liposomal bilayers: an expanding shell model of monomer distribution. Langmuir 27(7):3792–3797
Riley T, Heald CR, Stolnik S, Garnett MC, Illum L, Davis SS, King SM, Heenan RK, Purkiss SC, Barlow RJ, Gellert PR, Washington C (2003) Core−shell structure of PLA−PEG nanoparticles used for drug delivery. Langmuir 19(20):8428–8435
Rissanen S, Kumorek M, Martinez-Seara H, Li Y-C, Jamróz D, Bunker A, Nowakowska M, Vattulainen I, Kepczynski M, Róg T (2014) Effect of PEGylation on drug entry into lipid bilayer. J Phys Chem B 118(1):144–151
Rube A, Hause G, Mader K, Kohlbrecher J (2005) Core-shell structure of miglyol/poly(D,L-lactide)/poloxamer nanocapsules studied by small-angle neutron scattering. J Control Release 107(2):244–252
Rubner MF, Cohen RE. Layer-by-layer processed multilayers: challenges and opportunities. In: Decher G, Schlenoff JB (eds) Multilayer thin films: sequential assembly of nanocomposite materials. 2nd edn. Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
Sakamoto S, Sanada Y, Sakashita M, Nishina K, Nakai K, Yusa S-I, Sakurai K (2014) Chain-length dependence of polyion complex architecture bearing phosphobetaine block explored using SAXS and FFF-MALS. Polym J 46(9):617–622
Salentinig S, Tangso KJ, Hawley A, Boyd BJ (2014) pH-driven colloidal transformations based on the vasoactive drug nicergoline. Langmuir 30(49):14776–14781
Salva R, Le Meins J-F, Sandre O, Brûlet A, Schmutz M, Guenoun P, Lecommandoux S (2013) Polymersome shape transformation at the nanoscale. ACS Nano 7(10):9298–9311
Sanada Y, Akiba I, Sakurai K, Shiraishi K, Yokoyama M, Mylonas E, Ohta N, Yagi N, Shinohara Y, Amemiya Y (2013) Hydrophobic molecules infiltrating into the poly(ethylene glycol) domain of the core/shell interface of a polymeric micelle: evidence obtained with anomalous small-angle x-ray scattering. J Am Chem Soc 135(7):2574–2582
Sauer M, Meier W (2004) Polymer nanocontainers for drug delivery. In: Carrier-based drug delivery, vol 879. American Chemical Society, pp 224–237
Schnablegger H, Singh Y (2013) The SAXS guide, 3rd edn. Anton Paar GmbH, Austria
Shutava TG, Lvov YM (2006) Nano-engineered microcapsules of tannic acid and chitosan for protein encapsulation. J Nanosci Nanotechnol 6(6):1655–1661
Shutova TG, Agabekov VE, Lvov YM (2007) Reaction of radical cations with multilayers of tannic acid and polyelectrolytes. Russ J Gen Chem 77(9):1494–1501
Skirtach AG, Yashchenok AM, Mohwald H (2011) Encapsulation, release and applications of LbL polyelectrolyte multilayer capsules. Chem Commun 47(48):12736–12746
Smith GN, Alexander S, Brown P, Gillespie DAJ, Grillo I, Heenan RK, James C, Kemp R, Rogers SE, Eastoe J (2014) Interaction between surfactants and colloidal latexes in nonpolar solvents studied using contrast-variation small-angle neutron scattering. Langmuir 30(12):3422–3431
Srinivas G, Mohan RV, Kelkar AD (2013) Polymer micelle assisted transport and delivery of model hydrophilic components inside a biological lipid vesicle: a coarse-grain simulation study. J Phys Chem B 117(40):12095–12104
Sukhorukov GB, Möhwald H (2007) Multifunctional cargo systems for biotechnology. Trends Biotechnol 25(3):93–98
Tang Z, Wang Y, Podsiadlo P, Kotov NA (2006) Biomedical applications of layer-by-layer assembly: from biomimetics to tissue engineering. Adv Mater 18(24):3203–3224
Tong W, Gao C (2008) Multilayer microcapsules with tailored structures for bio-related applications. J Mater Chem 18(32):3799–3812
Urbina MC, Zinoveva S, Miller T, Sabliov CM, Monroe WT, Kumar CSSR (2008) Investigation of magnetic nanoparticle−polymer composites for multiple-controlled drug delivery. J Phys Chem C 112(30):11102–11108
Veronese FM, Mero A (2012) The impact of PEGylation on biological therapies. BioDrugs 22(5):315–329
Vicent MJ, Greco F, Nicholson RI, Paul A, Griffiths PC, Duncan R (2005) Polymer therapeutics designed for a combination therapy of hormone-dependent cancer. Angew Chem Int Ed 44(26):4061–4066
Vogtt K, Jeworrek C, Garamus VM, Winter R (2010) Microdomains in lipid vesicles: structure and distribution assessed by small-angle neutron scattering. J Phys Chem B 114(16):5643–5648
Von White G, Mohammed FS, Kitchens CL (2011) Small-angle neutron scattering investigation of gold nanoparticle clustering and ligand structure under antisolvent conditions. J Phys Chem C 115(38):18397–18405
Wang Y, Angelatos AS, Caruso F (2008) Template synthesis of nanostructured materials via layer-by-layer assembly. Chem Mater 20(3):848–858
Xue B, Kozlovskaya V, Liu F, Chen J, Williams JF, Campos-Gomez J, Saeed M, Kharlampieva E (2015) Intracellular degradable hydrogel cubes and spheres for anti-cancer drug delivery. ACS Appl Mater Interfaces 7(24):13633–13644
Yang B, Lowe JP, Schweins R, Edler KJ (2015a) Small angle neutron scattering studies on the internal structure of poly(lactide-co-glycolide)-block-poly(ethylene glycol) nanoparticles as drug delivery vehicles. Biomacromolecules 16(2):457–464
Yang W, Lu J, Gilbert EP, Knott R, He L, Cheng W (2015b) Probing soft corona structures of DNA-capped nanoparticles by small angle neutron scattering. J Phys Chem C 119(32):18773–18778
Yin P, Wu B, Mamontov E, Daemen LL, Cheng Y, Li T, Seifert S, Hong K, Bonnesen PV, Keum JK, Ramirez-Cuesta AJ (2016) X-ray and neutron scattering study of the formation of core-shell-type polyoxometalates. J Am Chem Soc 138:2638–2643
Yokoyama M, Okano T, Sakurai Y, Suwa S, Kataoka K (1996) Introduction of cisplatin into polymeric micelle. J Control Release 39(2):351–356
Zavgorodnya O, Kozlovskaya V, Kharlampieva E (2015) Nanostructured highly-swollen hydrogels: complexation with amino acids through copper (II) ions. Polymer 74:94–107
Zeno WF, Hilt S, Aravagiri KK, Risbud SH, Voss JC, Parikh AN, Longo ML (2014) Analysis of lipid phase behavior and protein conformational changes in nanolipoprotein particles upon entrapment in sol–gel-derived silica. Langmuir 30(32):9780–9788
Zhu Q, Harris MT, Taylor LS (2011) Time-resolved SAXS/WAXS study of the phase behavior and microstructural evolution of drug/PEG solid dispersions. Mol Pharm 8(3):932–939
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This work was supported by NSF Career Award 1350370.
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Alford, A., Kozlovskaya, V., Kharlampieva, E. (2017). Small Angle Scattering for Pharmaceutical Applications: From Drugs to Drug Delivery Systems. In: Chaudhuri, B., Muñoz, I., Qian, S., Urban, V. (eds) Biological Small Angle Scattering: Techniques, Strategies and Tips. Advances in Experimental Medicine and Biology, vol 1009. Springer, Singapore. https://doi.org/10.1007/978-981-10-6038-0_15
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