\documentclass[11pt,twoside]{article}\makeatletter \IfFileExists{xcolor.sty}% {\RequirePackage{xcolor}}% {\RequirePackage{color}} \usepackage{colortbl} \usepackage{wrapfig} \usepackage{ifxetex} \ifxetex \usepackage{fontspec} \usepackage{xunicode} \catcode`⃥=\active \def⃥{\textbackslash} \catcode`❴=\active \def❴{\{} \catcode`❵=\active \def❵{\}} \def\textJapanese{\fontspec{Noto Sans CJK JP}} \def\textChinese{\fontspec{Noto Sans CJK SC}} \def\textKorean{\fontspec{Noto Sans CJK KR}} \setmonofont{DejaVu Sans Mono} \else \IfFileExists{utf8x.def}% {\usepackage[utf8x]{inputenc} \PrerenderUnicode{–} }% {\usepackage[utf8]{inputenc}} \usepackage[english]{babel} \usepackage[T1]{fontenc} \usepackage{float} \usepackage[]{ucs} \uc@dclc{8421}{default}{\textbackslash } \uc@dclc{10100}{default}{\{} \uc@dclc{10101}{default}{\}} \uc@dclc{8491}{default}{\AA{}} \uc@dclc{8239}{default}{\,} \uc@dclc{20154}{default}{ } \uc@dclc{10148}{default}{>} \def\textschwa{\rotatebox{-90}{e}} \def\textJapanese{} \def\textChinese{} \IfFileExists{tipa.sty}{\usepackage{tipa}}{} \fi \def\exampleFont{\ttfamily\small} \DeclareTextSymbol{\textpi}{OML}{25} \usepackage{relsize} \RequirePackage{array} \def\@testpach{\@chclass \ifnum \@lastchclass=6 \@ne \@chnum \@ne \else \ifnum \@lastchclass=7 5 \else \ifnum \@lastchclass=8 \tw@ \else \ifnum \@lastchclass=9 \thr@@ \else \z@ \ifnum \@lastchclass = 10 \else \edef\@nextchar{\expandafter\string\@nextchar}% \@chnum \if \@nextchar c\z@ \else \if \@nextchar l\@ne \else \if \@nextchar r\tw@ \else \z@ \@chclass \if\@nextchar |\@ne \else \if \@nextchar !6 \else \if \@nextchar @7 \else \if \@nextchar (8 \else \if \@nextchar )9 \else 10 \@chnum \if \@nextchar m\thr@@\else \if \@nextchar p4 \else \if \@nextchar b5 \else \z@ \@chclass \z@ \@preamerr \z@ \fi \fi \fi \fi \fi \fi \fi \fi \fi \fi \fi \fi \fi \fi \fi \fi} \gdef\arraybackslash{\let\\=\@arraycr} \def\@textsubscript#1{{\m@th\ensuremath{_{\mbox{\fontsize\sf@size\z@#1}}}}} \def\Panel#1#2#3#4{\multicolumn{#3}{){\columncolor{#2}}#4}{#1}} \def\abbr{} \def\corr{} \def\expan{} \def\gap{} \def\orig{} \def\reg{} \def\ref{} \def\sic{} \def\persName{}\def\name{} \def\placeName{} \def\orgName{} \def\textcal#1{{\fontspec{Lucida Calligraphy}#1}} \def\textgothic#1{{\fontspec{Lucida Blackletter}#1}} \def\textlarge#1{{\large #1}} \def\textoverbar#1{\ensuremath{\overline{#1}}} \def\textquoted#1{‘#1’} \def\textsmall#1{{\small #1}} \def\textsubscript#1{\@textsubscript{\selectfont#1}} \def\textxi{\ensuremath{\xi}} \def\titlem{\itshape} \newenvironment{biblfree}{}{\ifvmode\par\fi } \newenvironment{bibl}{}{} \newenvironment{byline}{\vskip6pt\itshape\fontsize{16pt}{18pt}\selectfont}{\par } \newenvironment{citbibl}{}{\ifvmode\par\fi } \newenvironment{docAuthor}{\ifvmode\vskip4pt\fontsize{16pt}{18pt}\selectfont\fi\itshape}{\ifvmode\par\fi } \newenvironment{docDate}{}{\ifvmode\par\fi } \newenvironment{docImprint}{\vskip 6pt}{\ifvmode\par\fi } \newenvironment{docTitle}{\vskip6pt\bfseries\fontsize{22pt}{25pt}\selectfont}{\par } \newenvironment{msHead}{\vskip 6pt}{\par} \newenvironment{msItem}{\vskip 6pt}{\par} \newenvironment{rubric}{}{} \newenvironment{titlePart}{}{\par } \newcolumntype{L}[1]{){\raggedright\arraybackslash}p{#1}} \newcolumntype{C}[1]{){\centering\arraybackslash}p{#1}} \newcolumntype{R}[1]{){\raggedleft\arraybackslash}p{#1}} \newcolumntype{P}[1]{){\arraybackslash}p{#1}} \newcolumntype{B}[1]{){\arraybackslash}b{#1}} \newcolumntype{M}[1]{){\arraybackslash}m{#1}} \definecolor{label}{gray}{0.75} \def\unusedattribute#1{\sout{\textcolor{label}{#1}}} \DeclareRobustCommand*{\xref}{\hyper@normalise\xref@} \def\xref@#1#2{\hyper@linkurl{#2}{#1}} \begingroup \catcode`\_=\active \gdef_#1{\ensuremath{\sb{\mathrm{#1}}}} \endgroup \mathcode`\_=\string"8000 \catcode`\_=12\relax \usepackage[a4paper,twoside,lmargin=1in,rmargin=1in,tmargin=1in,bmargin=1in,marginparwidth=0.75in]{geometry} \usepackage{framed} \definecolor{shadecolor}{gray}{0.95} \usepackage{longtable} \usepackage[normalem]{ulem} \usepackage{fancyvrb} \usepackage{fancyhdr} \usepackage{graphicx} \usepackage{marginnote} \renewcommand{\@cite}[1]{#1} \renewcommand*{\marginfont}{\itshape\footnotesize} \def\Gin@extensions{.pdf,.png,.jpg,.mps,.tif} \pagestyle{fancy} \usepackage[pdftitle={Synthesis and Analytical Characterization of Ester and Amine Terminated PAMAM Dendrimers}, pdfauthor={}]{hyperref} \hyperbaseurl{} \paperwidth210mm \paperheight297mm \def\@pnumwidth{1.55em} \def\@tocrmarg {2.55em} \def\@dotsep{4.5} \setcounter{tocdepth}{3} \clubpenalty=8000 \emergencystretch 3em \hbadness=4000 \hyphenpenalty=400 \pretolerance=750 \tolerance=2000 \vbadness=4000 \widowpenalty=10000 \renewcommand\section{\@startsection {section}{1}{\z@}% {-1.75ex \@plus -0.5ex \@minus -.2ex}% {0.5ex \@plus .2ex}% {\reset@font\Large\bfseries}} \renewcommand\subsection{\@startsection{subsection}{2}{\z@}% {-1.75ex\@plus -0.5ex \@minus- .2ex}% {0.5ex \@plus .2ex}% {\reset@font\Large}} \renewcommand\subsubsection{\@startsection{subsubsection}{3}{\z@}% {-1.5ex\@plus -0.35ex \@minus -.2ex}% {0.5ex \@plus .2ex}% {\reset@font\large}} \renewcommand\paragraph{\@startsection{paragraph}{4}{\z@}% {-1ex \@plus-0.35ex \@minus -0.2ex}% {0.5ex \@plus .2ex}% {\reset@font\normalsize}} \renewcommand\subparagraph{\@startsection{subparagraph}{5}{\parindent}% {1.5ex \@plus1ex \@minus .2ex}% {-1em}% {\reset@font\normalsize\bfseries}} \def\l@section#1#2{\addpenalty{\@secpenalty} \addvspace{1.0em plus 1pt} \@tempdima 1.5em \begingroup \parindent \z@ \rightskip \@pnumwidth \parfillskip -\@pnumwidth \bfseries \leavevmode #1\hfil \hbox to\@pnumwidth{\hss #2}\par \endgroup} \def\l@subsection{\@dottedtocline{2}{1.5em}{2.3em}} \def\l@subsubsection{\@dottedtocline{3}{3.8em}{3.2em}} \def\l@paragraph{\@dottedtocline{4}{7.0em}{4.1em}} \def\l@subparagraph{\@dottedtocline{5}{10em}{5em}} \@ifundefined{c@section}{\newcounter{section}}{} \@ifundefined{c@chapter}{\newcounter{chapter}}{} \newif\if@mainmatter \@mainmattertrue \def\chaptername{Chapter} \def\frontmatter{% \pagenumbering{roman} \def\thechapter{\@roman\c@chapter} \def\theHchapter{\roman{chapter}} \def\thesection{\@roman\c@section} \def\theHsection{\roman{section}} \def\@chapapp{}% } \def\mainmatter{% \cleardoublepage \def\thechapter{\@arabic\c@chapter} \setcounter{chapter}{0} \setcounter{section}{0} \pagenumbering{arabic} \setcounter{secnumdepth}{6} \def\@chapapp{\chaptername}% \def\theHchapter{\arabic{chapter}} \def\thesection{\@arabic\c@section} \def\theHsection{\arabic{section}} } \def\backmatter{% \cleardoublepage \setcounter{chapter}{0} \setcounter{section}{0} \setcounter{secnumdepth}{2} \def\@chapapp{\appendixname}% \def\thechapter{\@Alph\c@chapter} \def\theHchapter{\Alph{chapter}} \appendix } \newenvironment{bibitemlist}[1]{% \list{\@biblabel{\@arabic\c@enumiv}}% {\settowidth\labelwidth{\@biblabel{#1}}% \leftmargin\labelwidth \advance\leftmargin\labelsep \@openbib@code \usecounter{enumiv}% \let\p@enumiv\@empty \renewcommand\theenumiv{\@arabic\c@enumiv}% }% \sloppy \clubpenalty4000 \@clubpenalty \clubpenalty \widowpenalty4000% \sfcode`\.\@m}% {\def\@noitemerr {\@latex@warning{Empty `bibitemlist' environment}}% \endlist} \def\tableofcontents{\section*{\contentsname}\@starttoc{toc}} \parskip0pt \parindent1em \def\Panel#1#2#3#4{\multicolumn{#3}{){\columncolor{#2}}#4}{#1}} \newenvironment{reflist}{% \begin{raggedright}\begin{list}{} {% \setlength{\topsep}{0pt}% \setlength{\rightmargin}{0.25in}% \setlength{\itemsep}{0pt}% \setlength{\itemindent}{0pt}% \setlength{\parskip}{0pt}% \setlength{\parsep}{2pt}% \def\makelabel##1{\itshape ##1}}% } {\end{list}\end{raggedright}} \newenvironment{sansreflist}{% \begin{raggedright}\begin{list}{} {% \setlength{\topsep}{0pt}% \setlength{\rightmargin}{0.25in}% \setlength{\itemindent}{0pt}% \setlength{\parskip}{0pt}% \setlength{\itemsep}{0pt}% \setlength{\parsep}{2pt}% \def\makelabel##1{\upshape ##1}}% } {\end{list}\end{raggedright}} \newenvironment{specHead}[2]% {\vspace{20pt}\hrule\vspace{10pt}% \phantomsection\label{#1}\markright{#2}% \pdfbookmark[2]{#2}{#1}% \hspace{-0.75in}{\bfseries\fontsize{16pt}{18pt}\selectfont#2}% }{} \def\TheFullDate{2013-01-15 (revised: 15 January 2013)} \def\TheID{\makeatother } \def\TheDate{2013-01-15} \title{Synthesis and Analytical Characterization of Ester and Amine Terminated PAMAM Dendrimers} \author{}\makeatletter \makeatletter \newcommand*{\cleartoleftpage}{% \clearpage \if@twoside \ifodd\c@page \hbox{}\newpage \if@twocolumn \hbox{}\newpage \fi \fi \fi } \makeatother \makeatletter \thispagestyle{empty} \markright{\@title}\markboth{\@title}{\@author} \renewcommand\small{\@setfontsize\small{9pt}{11pt}\abovedisplayskip 8.5\p@ plus3\p@ minus4\p@ \belowdisplayskip \abovedisplayskip \abovedisplayshortskip \z@ plus2\p@ \belowdisplayshortskip 4\p@ plus2\p@ minus2\p@ \def\@listi{\leftmargin\leftmargini \topsep 2\p@ plus1\p@ minus1\p@ \parsep 2\p@ plus\p@ minus\p@ \itemsep 1pt} } \makeatother \fvset{frame=single,numberblanklines=false,xleftmargin=5mm,xrightmargin=5mm} \fancyhf{} \setlength{\headheight}{14pt} \fancyhead[LE]{\bfseries\leftmark} \fancyhead[RO]{\bfseries\rightmark} \fancyfoot[RO]{} \fancyfoot[CO]{\thepage} \fancyfoot[LO]{\TheID} \fancyfoot[LE]{} \fancyfoot[CE]{\thepage} \fancyfoot[RE]{\TheID} \hypersetup{citebordercolor=0.75 0.75 0.75,linkbordercolor=0.75 0.75 0.75,urlbordercolor=0.75 0.75 0.75,bookmarksnumbered=true} \fancypagestyle{plain}{\fancyhead{}\renewcommand{\headrulewidth}{0pt}} \date{} \usepackage{authblk} \providecommand{\keywords}[1] { \footnotesize \textbf{\textit{Index terms---}} #1 } \usepackage{graphicx,xcolor} \definecolor{GJBlue}{HTML}{273B81} \definecolor{GJLightBlue}{HTML}{0A9DD9} \definecolor{GJMediumGrey}{HTML}{6D6E70} \definecolor{GJLightGrey}{HTML}{929497} \renewenvironment{abstract}{% \setlength{\parindent}{0pt}\raggedright \textcolor{GJMediumGrey}{\rule{\textwidth}{2pt}} \vskip16pt \textcolor{GJBlue}{\large\bfseries\abstractname\space} }{% \vskip8pt \textcolor{GJMediumGrey}{\rule{\textwidth}{2pt}} \vskip16pt } \usepackage[absolute,overlay]{textpos} \makeatother \usepackage{lineno} \linenumbers \begin{document} \author[1]{Surya Prakash Gautam} \affil[1]{ Suresh Gyan Vihar University} \renewcommand\Authands{ and } \date{\small \em Received: 12 December 2012 Accepted: 1 January 2013 Published: 15 January 2013} \maketitle \begin{abstract} PAMAM dendrimers containing ethylene diamine core and methyal acrylate as repeating unit were synthesized by divergent approach. Analytical characterization of PAMAM dendrimers amine terminated full generation 4.0G and ester terminated half generation 3.5G were performed using UV-Vis spectroscopy, FT-IR spectroscopy, differential scanning calorimetry, NMR spectroscopy and MASS spectroscopy. The half generation dendrimers have the methyl ester terminating groups, which have the characteristic IR peaks for carbonyl at 1730-1750 cm-1. For the full generation dendrimers, when the methyl ester groups were converted to amide groups, the corresponding carbonyl shifted to 1660 cm- 1.The characteristic methyl ester peak, which appeared in all the 1H-NMR spectra of the ester terminating dendrimers, whereas it is absent in all the amine terminating dendrimers. The molecular weight was determined by ESI mass spectroscopy which further confirms the preparation of PAMAM dendrimers and provides information about the structural defects, polydispersity and purity. \end{abstract} \keywords{poly (amido) amine; PAMAM dendrimers; divergent approach; polydispersity.} \begin{textblock*}{18cm}(1cm,1cm) % {block width} (coords) \textcolor{GJBlue}{\LARGE Global Journals \LaTeX\ JournalKaleidoscope\texttrademark} \end{textblock*} \begin{textblock*}{18cm}(1.4cm,1.5cm) % {block width} (coords) \textcolor{GJBlue}{\footnotesize \\ Artificial Intelligence formulated this projection for compatibility purposes from the original article published at Global Journals. However, this technology is currently in beta. \emph{Therefore, kindly ignore odd layouts, missed formulae, text, tables, or figures.}} \end{textblock*} \let\tabcellsep& \section[{Introduction}]{Introduction}\par endrimers are spherical, well defined, highly branched macromolecules with dense surface functional groups (Fig. \hyperref[fig_2]{1}) \hyperref[b0]{[1]}\hyperref[b1]{[2]}\hyperref[b3]{[3]}. Ethylenediamine (EDA) core based Poly (amidoamine) (PAMAM) dendrimers synthesis needs repetitive Michael addition and amidation steps in which each iteration yields the next higher generation of the dendrimer. Multifunctional platform of dendrimers provides endless applications in drug delivery \hyperref[b4]{[4]}\hyperref[b5]{[5]}\hyperref[b6]{[6]}\hyperref[b7]{[7]}\hyperref[b8]{[8]}. The synthesized PAMAM dendrimers are characterized for UV, FT-IR, NMR, DSC and MASS analysis. In the biomedical field dendrimers had been used for drug delivery, gene therapy, antigen conjugates, NMR contrast agents and synthetic vaccines \hyperref[b9]{[9]}\hyperref[b10]{[10]}\hyperref[b11]{[11]}\hyperref[b12]{[12]}\hyperref[b13]{[13]}\hyperref[b14]{[14]}\hyperref[b15]{[15]}. UV-Vis spectrometry provides the proof of synthesis as well as the conjugation (surface modification) on dendrimers due to characteristic absorption maximum or shift in Lambda Max value due to conjugation \hyperref[b16]{[16]}\hyperref[b17]{[17]}\hyperref[b18]{[18]}\hyperref[b19]{[19]}\hyperref[b20]{[20]}. Appearance disappearance and reappearance of characteristic peaks in FTIR spectroscopy provides the proof of synthetic. Disappearance of nitrile groups in the synthesis of PPI dendrimers, disappearance reappearance of amine groups in PAMAM dendrimers generation, Pegylation of PAMAM dendrimers, disappearance of the aldehydes during the synthesis of PMMH dendrimers reflects the synthesis and surface modifications \hyperref[b21]{[21]}\hyperref[b22]{[22]}\hyperref[b23]{[23]}. Nuclear magnetic resonance (NMR) spectroscopy permits determination of the structure and dynamics of molecules in solution. PAMAM dendrimers and complexed PAMAM are characterized by Rotational-Echo Double Resonance (REDOR) solid-state NMR spectroscopy \hyperref[b25]{[24]}. Multidimensional NMR spectroscopy ((2D)-NMR, (3D)-NMR) is also acquiring increasing importance in the characterization of dendrimers \hyperref[b26]{[25]}. NOESY experiments permit quantitative determinations of internuclear distances for nuclei in different parts of the dendrimer molecule \hyperref[b27]{[26]}. The dynamics of dendritic branches can be investigated by measurement of l Hand 13 C-spin-lattice relaxation times (T 1 ). Since the mobility of a dendrimer segment is proportional to its T 1 value, the change of mobility of the various dendrimer segments \hyperref[b28]{[27]}. The DSC technique is generally used to detect the Glass Transition Temperature (Tg). The Tg is affected by the end group substitutions, and the molecular mass. DSC and Temperature Modulated Calorimetry (TMC) were also used to detect physical aging of PMMH dendrimers. Generation has practically no influence on the Tg values of liquid crystal dendrimers based on poly (phenyl acetylene) \hyperref[b29]{[28]}\hyperref[b30]{[29]}\hyperref[b31]{[30]}.MALDI-TOF-MS and ESI-MS are among the few analytical methods suitable for detailed studies of structural defects in dendrimers on the basis of characteristic fragmentation patterns. The polydispersity and the purity of dendrimers explain the percentage of defect-free dendritic material \hyperref[b32]{[31]}\hyperref[b33]{[32]} \section[{Materials and Methods}]{Materials and Methods} \section[{a) Materials}]{a) Materials}\par Ethylenediamine (Merck Specialities (P) Ltd. Mumbai) and Methylacrylate (Loba Chem (P) Ltd., Mumbai) were used after distillation. Rest of the chemicals was purchased from Loba Chem (P) Ltd., Mumbai. For synthesis HPLC grade solvents were used. \section[{b) Preparation of PAMAM Dendrimers}]{b) Preparation of PAMAM Dendrimers}\par Dendrimers were prepared by a divergent synthesis scheme using the reagent excess method starting from Ethylenediamine (EDA) by consecutive Michael addition and ester amidation reaction. Dendrimers were prepared according to following step: Michael addition of primary amine (EDA in very first step) to methyl acrylate followed by amidation of formed multiester (tetra ester at very beginning) of EDA.\par Michael addition reaction used ethylene diamine (EDA) as an initiator core for starting the synthesis of dendrimers by attaching four acrylate moieties on each amino group of EDA. The resulting compound referred to as "generation -0.5PAMAM tetra ester". This caused the branching in the structure of the dendrimer. The second step used is amidation of terminal carbomethoxy group (COCH 3 ) of methyl acrylate with EDA. This tetra ester with excess EDA gave "generation 0.0 PAMAM tetra amine". EDA was used in excess to about twenty to hundred times to avoid incomplete reactions and hence improved yield. The reaction was carried out using methanol as medium. The reactions were followed by removal of excess reagents by rotary vacuum evaporation at 55°C-60°C, in every step. The whole reaction was carried out in dark at room temperature, using amber colored round bottom flask, which was corked tightly. Addition reaction was allowed to complete in two days, whereas amidation reaction complete in four days. \section[{b) FT-IR Spectroscopy}]{b) FT-IR Spectroscopy}\par The important peaks in FT-IR spectra of 3.5 G dendrimers were of Quaternary ammonium ion peak 3218.61 cm -1 , N-H stretch anti-symmetric sub. Primary amine 3021.91 cm -1 , C-H stretch 2402.87 cm -1 , 2834.22 cm -1 , C=O stretch of carbonyl group1731.61 cm -1 , 1650.81 cm -1 , C-C bending 1215.91 cm -1 .The important peaks in FT-IR spectra of 4.0G dendrimers were of N-H stretch of primary amine at 3310.21 cm -1 , N-H stretch of anti-symmetric substituted primary amine at 3021.87cm -1 , C-H stretch at 2947.66cm -1 , C=O stretch of carbonyl group at 1668.12 cm -1 , N-H bending of N-substituted amide at 1511.92,1417.42 cm -1 , C-C bending at 1215.90 cm -1 . The results obtained are given in Table \hyperref[tab_1]{1}. The FT-IR spectra of 3.5G and 4.0G PAMAM dendrimers are shown in Fig. {\ref 4 \&} {\ref 3}).\par The ESI Mass spectra further confirm the preparation of PAMAM dendrimers. The molecular weight peak of 3.5G PAMAM dendrimers was 11944 Da and the molecular weight peak of 4.0G PAMAM dendrimers was 14483 Da. The ESI Mass spectra of 3.5G and 4.0G PAMAM dendrimers are given in Fig. \hyperref[fig_2]{10} \& 11 respectively, while data are shown in Table \hyperref[tab_3]{4}. \section[{IV.}]{IV.} \section[{Conclusions}]{Conclusions}\par The PAMAM dendrimers were synthesized using ethylenediamine as initiator core and methyl acrylate as repeating unit. Synthetic progress involves Michael addition and exhaustive amidation to complete cycle. Increasing amount of reactant in every progressive step was added to avoid incomplete reaction and hence to improve the yield. Completion of the reaction was confirmed by the copper sulphate solution reaction. The whole generation gave purple color, whereas half generation gave deep blue color, due to copper chelation at the terminal group of dendrimers. All the steps were found to be complete by the color reactions. Progress of Synthesis and differentiation of 3.5G and 4.0G was confirmed by UV, IR, NMR and MASS spectroscopy.\par The ? max values were found out to be in range of 277-286 nm. The ? max of 4.0G PAMAM dendrimers was found to be 277.5 nm. In IR spectrum peaks of N-H stretch for primary amine were obtained at 3310.21 cm -1 , which was due to NH 2 periphery of 4.0G PAMAM dendrimers. Half genenration carboxyal terminated shows intense peaks in the-C=O region while full generations shows intense peaks in the-N-H stretch for primary amine.\par Appearance-disappearance reappearance of characteristic peaks provides the proof of synthesis. The changes in Endothermic peak from 120.03 to 120.56 0C were observed which shows the change in structure of PAMAM dendrimers. In NMR spectra terminal amino group proton peaks (-CH 2 NH 2 ) were obtained at 3.84 ppm and 2.68, 2.93, 3.03 ppm for carbonyl methylene proton (-CH 2 C=O). Characteristic shifts in NMR spectra of 3.5G PAMAM dendrimers was due to terminal groups of -COOCH 3 at 3.73 ppm and 4.0G PAMAM dendrimers was for terminal groups of -NHCH 2 CH 2 NH 2 at 3.84 ppm. NMR spectral characteristic like shielding effects, deshielding effects, peak intensity, and integral value provides information about synthesis of dendrimers (Characteristic peaks in the spectra); conjugation chemistry (Shielding deshielding effects shifts in peaks); hydrodynamic radii (NMR pulse-field gradient spin ?e cho); number of protons (Intensity of peaks and integral value); conformational changes (unique NMR signals from the core to the periphery); isomer populations observed by 1 H NMR reveal the onset of globular structure; NOE complexity emerges with globular structure: variable temperature NOESY studies show that the peripheral groups; Variable temperature coefficients for NH protons suggests that solvent is largely excluded from the interior of the dendrimer. Relaxation studies show that peripheral groups are more dynamic than groups at the core. The NMR data corroborated well with the FT-IR data to confirm the structure of the dendrimers.\par The molecular weight peak of 3.5G PAMAM dendrimers was 11944 Da and the molecular weight peak of 4.0G PAMAM dendrimers was 14483 Da, which was approximate to theoretical molecular weight of PAMAM dendrimers. Deviation may be due to incomplete Michael addition causing the appearance of unsymmetrical dendrimeric structures, intramolecular cyclization, and the retro-Michael reaction. Synthesis of PAMAM dendrimers always generates "structural errors". Therefore it needs more attention for improving the synthesis and exploring the novel possible applications. \section[{V.}]{V.}\par Volume XIII Issue III Version I \begin{figure}[htbp] \noindent\textbf{}\includegraphics[]{image-2.png} \caption{\label{fig_0}}\end{figure} \begin{figure}[htbp] \noindent\textbf{}\includegraphics[]{image-3.png} \caption{\label{fig_1}}\end{figure} \begin{figure}[htbp] \noindent\textbf{1}\includegraphics[]{image-4.png} \caption{\label{fig_2}Figure 1 :}\end{figure} \begin{figure}[htbp] \noindent\textbf{234567}\includegraphics[]{image-5.png} \caption{\label{fig_3}Figure 2 :Figure 3 :Figure 4 :Figure 5 :Figure 6 :Figure 7 :}\end{figure} \begin{figure}[htbp] \noindent\textbf{8}\includegraphics[]{image-6.png} \caption{\label{fig_4}Figure 8 :}\end{figure} \begin{figure}[htbp] \noindent\textbf{}\includegraphics[]{image-7.png} \caption{\label{figure7}}\end{figure} \begin{figure}[htbp] \noindent\textbf{}\includegraphics[]{image-8.png} \caption{\label{figure8}}\end{figure} \begin{figure}[htbp] \noindent\textbf{}\includegraphics[]{image-9.png} \caption{\label{figure9}}\end{figure} \begin{figure}[htbp] \noindent\textbf{1} \par \begin{longtable}{P{0.85\textwidth}} 013\\ 2\\ Year\end{longtable} \par \caption{\label{tab_1}Table 1 :}\end{figure} \begin{figure}[htbp] \noindent\textbf{2} \par \begin{longtable}{P{0.18679435483870968\textwidth}P{0.03084677419354839\textwidth}P{0.05483870967741935\textwidth}P{0.13195564516129032\textwidth}P{0.44556451612903225\textwidth}} \multicolumn{2}{l}{S. No.}\tabcellsep \multicolumn{2}{l}{Generation of dendrimers}\tabcellsep Endothermic peak ( 0 C)\\ 1.\tabcellsep \tabcellsep \tabcellsep \tabcellsep 120.03\\ \tabcellsep \tabcellsep 3.5G\tabcellsep \\ 2.\tabcellsep \tabcellsep 4.0G\tabcellsep \tabcellsep 120.56\\ \multicolumn{5}{l}{Table 3 : NMR spectra chemical shifts and interpretation of 3.5 G and 4.0G PAMAM dendrimers}\\ S. No.\tabcellsep \multicolumn{2}{l}{Generation}\tabcellsep ? values (ppm)\tabcellsep Interpretation\\ \tabcellsep \tabcellsep \tabcellsep 2.44 and 2.46\tabcellsep -NCH 2 CH 2 N-\\ \tabcellsep \tabcellsep \tabcellsep 2.52\tabcellsep -NHCOCH 2 CH 2 N-\\ \tabcellsep \tabcellsep \tabcellsep 2.68\tabcellsep -NHCOCH 2 CH 2 N-\\ 1\tabcellsep 3.5G\tabcellsep \tabcellsep 3.40\tabcellsep -CONHCH 2 CH 2 N-\\ \tabcellsep \tabcellsep \tabcellsep 2.93\tabcellsep -NCH 2 CH 2 COOCH 3\\ \tabcellsep \tabcellsep \tabcellsep 3.73\tabcellsep -NCH 2 CH 2 COOC H 3\\ \tabcellsep \tabcellsep \tabcellsep 2.93\tabcellsep -NCH 2 CH 2 N-\\ \tabcellsep \tabcellsep \tabcellsep 2.98\tabcellsep -NHCOCH 2 CH 2 N-\\ 2\tabcellsep 4.0G\tabcellsep \tabcellsep 3.03 3.40\tabcellsep -NHCOCH 2 CH 2 N--CONHCH 2 CH 2 N-\\ \tabcellsep \tabcellsep \tabcellsep 2.95,2.99\tabcellsep -CONHCH 2 CH 2 N-\\ \tabcellsep \tabcellsep \tabcellsep 3.84\tabcellsep -CONHCH 2 CH 2 NH 2 (var)\end{longtable} \par \caption{\label{tab_2}Table 2 :}\end{figure} \begin{figure}[htbp] \noindent\textbf{4} \par \begin{longtable}{} \end{longtable} \par {\small\itshape [Note: ESI Mass spectra interpretation of 3.5 G and 4.0 G PAMAM dendrimers]} \caption{\label{tab_3}Table 4 :}\end{figure} \footnote{© 2013 Global Journals Inc. (US)} \footnote{Synthesis and Analytical Characterization of Ester and Amine Terminated PAMAM Dendrimers} \footnote{( )BSynthesis and Analytical Characterization of Ester and Amine Terminated PAMAM Dendrimers} \footnote{© 2013 Global Journ © 2013 Global Journals Inc. (US)} \backmatter \subsection[{Acknowledgement}]{Acknowledgement}\par We are very grateful to the management and faculties of Department of Pharmaceutical Chemistry, SCOPE for providing necessary facilities and encouragement. We would like to acknowledge the Central Drug Research Institute (CDRI), Lucknow and CSMCRI, Bhavnagar for providing facilities of NMR and Mass spectroscopy. \begin{bibitemlist}{1} \bibitem[ Polym J ()]{b2}\label{b2} \textit{}, \textit{Polym J} 1985. 17 p. . \bibitem[ Macromolecules ()]{b24}\label{b24} \textit{}, \textit{Macromolecules} 2008. 41 p. . \bibitem[Felder et al. ()]{b31}\label{b31} ‘A combined ESI-and MALDI-MS(/MS) study of peripherally persulfonylated dendrimers: false negative results by MALDI-MS and analysis of defects’. T Felder , C A Schalley , H Fakhrnabavi , O Lukin . \textit{Chem Eur J} 2005. 11 p. . \bibitem[Tomalia et al.]{b1}\label{b1} \textit{A new class of polymers: starburst-dendritic macromolecules}, D A Tomalia , H Baker , J Dewald , M Hall , G Kallos , S Martin , J Roeck , J Ryder , P Smith . \bibitem[Wijmenga et al. ()]{b26}\label{b26} ‘A threedimensional heteronuclear multiple-quantum coherence homonuclear Hartman-Hahn experiment’. S S Wijmenga , K Hallenga , C W Hilberts . \textit{J Magn Reson} 1989. 84 p. . \bibitem[Bosman et al. ()]{b33}\label{b33} ‘About dendrimers: structure, physical properties, and applications’. A W Bosman , H M Janssen , E W Meijer . \textit{Chem Rev} 1999. 99 p. . \bibitem[Balogh et al. ()]{b18}\label{b18} ‘Characterization of dendrimer-gold nanocomposite materials’. L P Balogh , T R Ganser , X Shi . 13.33.1-EE13.33.6. \textit{Mater Res Soc Symp Proc} 2005. 847. \bibitem[Hummelen et al. ()]{b32}\label{b32} ‘Chirality in dendritic architectures’. J C Hummelen , Jlj Dongen , E W Meijer . \textit{Chem Eur J} 1997. 3 p. . \bibitem[Pesak and Moore ()]{b30}\label{b30} ‘Columnar liquid crystals from shapepersistent dendritic molecules’. D J Pesak , J S Moore . \textit{Angew Chem Int Ed Eng} 1997. 36 p. . \bibitem[Moreno and Simanek]{b23}\label{b23} \textit{Conformational analysis of triazine dendrimers: using NMR spectroscopy to probe the choreography of a dendrimer's dance}, K X Moreno , E E Simanek . \bibitem[Tomalia ()]{b10}\label{b10} ‘Dendrimer as quantized building blocks for nanoscale synthetic organic chemistry’. D A Tomalia . \textit{Aldrichimica Acta} 2004. 37 p. . \bibitem[Wiener et al. ()]{b14}\label{b14} ‘Dendrimerbased metal chelates: a new class of magnetic resonance imaging contrast agents’. E C Wiener , M W Brechbiel , H Brothers , R L Magin , O A Gansow , D A Tomalia , P C Lauterbur . \textit{Magn Reson Med} 1994. 31 p. . \bibitem[Zeng and Zimmerman ()]{b7}\label{b7} ‘Dendrimers in supramolecular chemistry: from molecular recognition to self-assembly’. F Zeng , S C Zimmerman . \textit{Chem Rev} 1997. 97 p. . \bibitem[Namazi and Adeli ()]{b5}\label{b5} ‘Dendrimers of citric acid and poly (ethyleneglycol) as the new drug-delivery agents’. H Namazi , M Adeli . \textit{Biomaterials} 2005. 26 p. . \bibitem[Duncan and Malik ()]{b9}\label{b9} ‘Dendrimers: biocompatibility and potential for delivery of anticancer agents’. R Duncan , N Malik . \textit{Proc Int Symp Control Release Bioact Matter} 1996. 23 p. . \bibitem[Patri et al. ()]{b21}\label{b21} ‘Dendritic polymer macromolecular carriers for drug delivery’. A K Patri , I J Majoros , J R Baker . \textit{Curr Opin Chem Biol} 2002. 6 p. . \bibitem[Tang et al. ()]{b12}\label{b12} ‘In vitro gene delivery by degraded polyamidoamine dendrimers’. M X Tang , C T Redemann , J Szoka . \textit{Bioconjugate Chem} 1996. 7 p. . \bibitem[Purohit et al. ()]{b8}\label{b8} ‘Interaction of cationic partial dendrimers with charged and neutral liposomes’. G Purohit , T Sakthivel , A T Florence . \textit{Int J Pharm} 2001. 214 p. . \bibitem[Neddersen et al. ()]{b20}\label{b20} ‘Laser ablation of metals: a new method for preparing SERS active colloids’. J Neddersen , G Chumanov , T M Cotton . \textit{Appl Spectrosc} 1993. 47 p. . \bibitem[Shi et al. ()]{b16}\label{b16} ‘Molecular heterogeneity analysis of poly(amidoamine) dendrimer-based mono-and multifunctional nanodevices by capillary electrophoresis’. X Shi , I J Majoros , A K Patri , X Bi , M T Islam , A Desai , T R Ganser , J R Baker . \textit{Analyst} 2006. 131 p. . \bibitem[Elsasser et al. ()]{b29}\label{b29} ‘Nematic dendrimers based on carbosilazane cores’. R Elsasser , G H Mehl , J W Goodby , M Veith . \textit{Angew Chem Int Ed Eng} 2001. 40 p. . \bibitem[Caminade et al. ()]{b25}\label{b25} ‘Phosphorus dendrimers as viewed by 31 P NMR spectroscopy; synthesis and characterization’. A M Caminade , R Laurent , C O Turrin , C Rebout , B D Nicot , A Ouali , M Zablocka , J P Majoral . \textit{Comptes Rendus Chimie} 2010. 13 p. . \bibitem[Esfand and Tomalia ()]{b3}\label{b3} ‘Poly (amidoamine) (PAMAM) dendrimers: from biomimicry to drug delivery and biomedical applications’. R Esfand , D A Tomalia . \textit{Drug Discovery Today} 2001. 6 p. . \bibitem[Guoping et al. ()]{b19}\label{b19} ‘PVP and G1.5 PAMAM dendrimer co-mediated synthesis of silver nanoparticles’. L Guoping , L Yunjun , T Huimin . \textit{J Solid State Chem} 2005. 178 p. . \bibitem[Bielinska et al. ()]{b11}\label{b11} ‘Regulation of in vitro gene expression using antisense oligonucleotides or antisense expression plasmids transfected using starburst pamam dendrimers’. A U Bielinska , J Kukowska-Latallo , Johnson J Tomalia , D Baker , JR . \textit{Nucl Acids Res} 1996. 24 p. . \bibitem[Konda et al. ()]{b4}\label{b4} ‘Specific targeting of folate-dendrimer MRI contrast agents to the high affinity folate receptor expressed in ovarian tumor xenografts’. S D Konda , M Aref , S Wang , M Brechbiel , E C Wiener . \textit{Magn Reson Mater Phys Biol Med} 2001. 12 p. . \bibitem[Tomalia et al. ()]{b0}\label{b0} ‘Starburst dendrimers: molecular-level control of size, shape, surface chemistry, topology, and flexibility from atoms to macroscopic matter’. D A Tomalia , A M Naylor , Iii Goddard , Wa . \textit{Angew Chem Int Ed Engl} 1990. 29 p. . \bibitem[Chai et al. ()]{b27}\label{b27} ‘Structure and conformation of DAB dendrimers in solution via multidimensional NMR techniques’. M Chai , Y Niu , W J Youngs , P L Rinaldi . \textit{J Am Chem Soc} 2001. 123 p. . \bibitem[Rao and Tam ()]{b15}\label{b15} ‘Synthesis of peptide dendrimer’. C Rao , J P Tam . \textit{J Am Chem Soc} 1994. 116 p. . \bibitem[Kojima et al. ()]{b22}\label{b22} ‘Synthesis of polyamidoamine dendrimers having poly-(ethylene glycol) grafts and their ability to encapsulate anticancer drugs’. C Kojima , K Kono , K Maruyama , T Tkagishi . \textit{Bioconjug Chem} 2000. 11 p. . \bibitem[Patri et al. ()]{b6}\label{b6} ‘Targeted drug delivery with dendrimers: Comparison of the release kinetics of covalently conjugated drug and non-covalent drug inclusion complex’. A K Patri , J F Kukowska-Latallo , J R Baker . \textit{Adv Drug Deliv Rev} 2005. 57 p. . \bibitem[Hedden et al. ()]{b17}\label{b17} ‘Templating of inorganic nanoparticles by PAMAM/PEG dendrimer-star polymers’. R C Hedden , B J Bauer , A P Smith , F Grohn , E Amis . \textit{J Polym} 2002. 43 p. . \bibitem[Singh ()]{b13}\label{b13} ‘Terminal groups in starburst dendrimers: activation and reactions with proteins’. P Singh . \textit{Bioconjugate Chem} 1998. 9 p. . \bibitem[Farrington et al. ()]{b28}\label{b28} ‘The melt viscosity of dendritic poly(benzyl ether) macromolecules’. P J Farrington , C J Hawker , Jmj Frechet , M E Mackay . \textit{Macromolecules} 1998. 31 p. . \end{bibitemlist} \end{document}