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Active ester is an ester functional group that is highly sensitive to nucleophilic attack. Active esters are useful in chemical synthesis and biochemistry, where the reaction of the NHS-ester group results in the formation of stable, irreversible amide bonds. For example, NHS ester-activated PEGylated polymers can react with primary amines at pH 7.2 to 9 to form stable (covalent) amide linkages.

Cat# Name Structure M.W. Purity Pricing
4arm PEG Acetic Acid
AP149194arm PEG Acetic Acid,MW 5K5000≥95% Pricing
AP149204arm PEG Acetic Acid,MW 10K10000≥95% Pricing
AP149214arm PEG Acetic Acid,MW 20K20000≥95% Pricing
AP149224arm PEG Acetic Acid,MW 40K40000≥95% Pricing
4arm PEG SCM
AP149394arm PEG Succinimidyl Carboxymethyl Ester, MW 5K5000≥95% Pricing
AP149364arm PEG Succinimidyl Carboxymethyl Ester, MW 10K10000≥95% Pricing
AP149374arm PEG Succinimidyl Carboxymethyl Ester, MW 20K20000≥95% Pricing
AP149384arm PEG Succinimidyl Carboxymethyl Ester, MW 40K40000≥95% Pricing
4arm PEG Vinylsulfone
AP149344arm PEG Vinylsulfone, MW 10K10000≥95% Pricing
AP149354arm PEG Vinylsulfone, MW 20K20000≥95% Pricing
AP148654arm-PEG-Epoxide, MW 10K10000≥95% Pricing
AP148664arm-PEG-Epoxide, MW 20K20000≥95% Pricing
AP147984arm-PEG-SAS, MW 10K10000≥95% Pricing
AP147994arm-PEG-SAS, MW 20K20000≥95% Pricing
AP148104arm-PEG-SC, MW 2K2000≥95% Pricing
AP148114arm-PEG-SC, MW 5K5000≥95% Pricing
AP148034arm-PEG-SC, MW 10K10000≥95% Pricing
AP148044arm-PEG-SC, MW 20K20000≥95% Pricing
AP148014arm-PEG-SG, MW 10K10000≥95% Pricing
AP148024arm-PEG-SG, MW 20K20000≥95% Pricing
AP148094arm-PEG-SG, MW 40K40000≥95% Pricing
AP148054arm-PEG-SS, MW 2K2000≥95% Pricing
AP148064arm-PEG-SS, MW 5K5000≥95% Pricing
AP148004arm-PEG-SS, MW 10K10000≥95% Pricing
AP148074arm-PEG-SS, MW 20K20000≥95% Pricing
AP148084arm-PEG-SS, MW 40K40000≥95% Pricing
AP14824Carboxymethyl-PEG-Carboxymethyl, MW 2K2000≥95% Pricing
AP14825Carboxymethyl-PEG-Carboxymethyl, MW 3.4K3400≥95% Pricing
AP14826Carboxymethyl-PEG-Carboxymethyl, MW 5K5000≥95% Pricing
AP14899Carboxymethyl-PEG-Carboxymethyl, MW 7.5K7500≥95% Pricing
AP14827Carboxymethyl-PEG-Carboxymethyl, MW 10K10000≥95% Pricing
AP14828Carboxymethyl-PEG-Carboxymethyl, MW 20K20000≥95% Pricing
AP14829Carboxymethyl-PEG-Carboxymethyl, MW 35K35000≥95% Pricing
AP14891Epoxide-PEG-Epoxide, MW 1K1000≥95% Pricing
AP14840Epoxide-PEG-Epoxide, MW 2K2000≥95% Pricing
AP14841Epoxide-PEG-Epoxide, MW 5K5000≥95% Pricing
AP14892Epoxide-PEG-Epoxide, MW 10K10000≥95% Pricing
AP14893Epoxide-PEG-Epoxide, MW 20K20000≥95% Pricing
HO-PEG-NHS ester
AP13388HO-PEG-NHS ester, MW 1K1000≥95% Pricing
AP13393HO-PEG-NHS ester, MW 2K2000≥95% Pricing
AP13405HO-PEG-NHS ester, MW 3.5K3500≥95% Pricing
AP13410HO-PEG-NHS ester, MW 5K5000≥95% Pricing
AP13411HO-PEG-NHS ester, MW 10K10000≥95% Pricing
AP14830mPEG-Carboxymethyl, MW 1K1000≥95% Pricing
AP14831mPEG-Carboxymethyl, MW 2K2000≥95% Pricing
AP14832mPEG-Carboxymethyl, MW 5K5000≥95% Pricing
AP14833mPEG-Carboxymethyl, MW 10K10000≥95% Pricing
AP14834mPEG-Carboxymethyl, MW 20K20000≥95% Pricing
AP14838mPEG-Epoxide, MW 2K2000≥95% Pricing
AP14839mPEG-Epoxide, MW 5K5000≥95% Pricing
m-PEG-Lys-NHS ester
AP13390m-PEG-Lys-NHS ester, MW 20K20000≥95% Pricing
AP13394m-PEG-Lys-NHS ester, MW 40K40000≥95% Pricing
m-PEG-NHS ester
AP13389m-PEG-NHS ester, MW 5K5000≥95% Pricing
AP13395m-PEG-NHS ester, MW 10K10000≥95% Pricing
AP13406m-PEG-NHS ester, MW 20K20000≥95% Pricing
m-PEG-Nitrophenyl Carbonate
AP15050mPEG-Nitrophenyl Carbonate, MW 1K1000≥95% Pricing
AP14861mPEG-Nitrophenyl Carbonate, MW 2K2000≥95% Pricing
AP14862mPEG-Nitrophenyl Carbonate, MW 5K5000≥95% Pricing
AP14863mPEG-Nitrophenyl Carbonate, MW 10K10000≥95% Pricing
AP14864mPEG-Nitrophenyl Carbonate, MW 20K20000≥95% Pricing
m-PEG-Orthopyridyl Disulfide
AP14844mPEG-Orthopyridyl Disulfide, MW 2K2000≥95% Pricing
AP14845mPEG-Orthopyridyl Disulfide, MW 5K5000≥95% Pricing
AP14846mPEG-Orthopyridyl Disulfide, MW 10K10000≥95% Pricing
AP14847mPEG-Orthopyridyl Disulfide, MW 20K20000≥95% Pricing
AP14848mPEG-Orthopyridyl Disulfide, MW 30K30000≥95% Pricing
AP14927Methoxy PEG Propionic Acid, MW 5K5000≥95% Pricing
AP14928Methoxy PEG Propionic Acid, MW 20K20000≥95% Pricing
AP14929Methoxy PEG Propionic Acid, MW 30K30000≥95% Pricing
AP14901Methoxy PEG Succinimidyl Carboxymethyl Ester,MW 2K2000≥95% Pricing
AP14902Methoxy PEG Succinimidyl Carboxymethyl Ester, MW 3K3000≥95% Pricing
AP14903Methoxy PEG Succinimidyl Carboxymethyl Ester, MW 5K5000≥95% Pricing
AP14904Methoxy PEG Succinimidyl Carboxymethyl Ester, MW 10K10000≥95% Pricing
AP14905Methoxy PEG Succinimidyl Carboxymethyl Ester, MW 20K20000≥95% Pricing
AP14906Methoxy PEG Succinimidyl Carboxymethyl Ester, MW 30K30000≥95% Pricing
AP14907Methoxy PEG Succinimidyl Carboxymethyl Ester, MW 35K35000≥95% Pricing
AP14908Methoxy PEG Succinimidyl Carboxymethyl Ester, MW 40K40000≥95% Pricing
AP14868mPEG-SPA, MW 550550≥95% Pricing
AP14867mPEG-SPA, MW 1K1000≥95% Pricing
AP14894mPEG-SPA, MW 5K5000≥95% Pricing
AP14895mPEG-SPA, MW 10K10000≥95% Pricing
AP14896mPEG-SPA, MW 20K20000≥95% Pricing
AP14897mPEG-SPA, MW 30K30000≥95% Pricing
m-PEG-Succinimidyl Carbonate
AP14761m-PEG-Succinimidyl Carbonate, MW 750750≥95% Pricing
AP14762m-PEG-Succinimidyl Carbonate, MW 1K1000≥95% Pricing
AP14763m-PEG-Succinimidyl Carbonate, MW 2K2000≥95% Pricing
AP14764m-PEG-Succinimidyl Carbonate, MW 5K5000≥95% Pricing
AP14765m-PEG-Succinimidyl Carbonate, MW 10K10000≥95% Pricing
AP14773m-PEG-Succinimidyl Carbonate, MW 12K12000≥95% Pricing
AP14766m-PEG-Succinimidyl Carbonate, MW 20K20000≥95% Pricing
AP14767m-PEG-Succinimidyl Carbonate, MW 30K30000≥95% Pricing
m-PEG-Succinimidyl Glutarate
AP14673m-PEG-Succinimidyl Glutarate, MW 2K2000≥95% Pricing
AP14674m-PEG-Succinimidyl Glutarate, MW 5K5000≥95% Pricing
AP14675m-PEG-Succinimidyl Glutarate, MW 10K10000≥95% Pricing
AP14676m-PEG-Succinimidyl Glutarate, MW 20K20000≥95% Pricing
AP14677m-PEG-Succinimidyl Glutarate, MW 30K30000≥95% Pricing
m-PEG-Succinimidyl Succinate
AP14668m-PEG-Succinimidyl Succinate, MW 2K2000≥95% Pricing
AP14669m-PEG-Succinimidyl Succinate, MW 5K5000≥95% Pricing
AP14670m-PEG-Succinimidyl Succinate, MW 10K10000≥95% Pricing
AP14671m-PEG-Succinimidyl Succinate, MW 20K20000≥95% Pricing
AP14672m-PEG-Succinimidyl Succinate, MW 30K30000≥95% Pricing
m-PEG-Succinimidyl Valerate
AP14663m-PEG-Succinimidyl Valerate, MW 2K2000≥95% Pricing
AP14664m-PEG-Succinimidyl Valerate, MW 5K5000≥95% Pricing
AP14665m-PEG-Succinimidyl Valerate, MW 10K10000≥95% Pricing
AP14666m-PEG-Succinimidyl Valerate, MW 20K20000≥95% Pricing
AP14667m-PEG-Succinimidyl Valerate, MW 30K30000≥95% Pricing
AP12579Methyltetrazine-mPEG, 5 kDa5000≥95% Pricing
AP12580Methyltetrazine-mPEG, 10 kDa10000≥95% Pricing
AP14768mPEG-SAS, MW 1K1000≥95% Pricing
AP14772mPEG-SAS, MW 2K2000≥95% Pricing
AP14769mPEG-SAS, MW 5K5000≥95% Pricing
AP14770mPEG-SAS, MW 10K10000≥95% Pricing
AP14771mPEG-SAS, MW 20K20000≥95% Pricing
AP15051NPC-PEG-NPC , MW 1K1000≥95% Pricing
AP14842NPC-PEG-NPC, MW 2K2000≥95% Pricing
AP14843NPC-PEG-NPC, MW 3.4K3400≥95% Pricing
AP15052NPC-PEG-NPC , MW 5K5000≥95% Pricing
AP15053NPC-PEG-NPC , MW 10K10000≥95% Pricing
AP15054NPC-PEG-NPC , MW 20K20000≥95% Pricing
AP14930OPSS PEG Succinimidyl Carboxymethyl Ester, MW 2K2000≥95% Pricing
AP14931OPSS PEG Succinimidyl Carboxymethyl Ester, MW 3.5K3500≥95% Pricing
AP14932OPSS PEG Succinimidyl Carboxymethyl Ester, MW 5K5000≥95% Pricing
AP14933OPSS PEG Succinimidyl Carboxymethyl Ester, MW 7.5K7500≥95% Pricing
AP14835OPSS-PEG-OPSS, MW 2K2000≥95% Pricing
AP14836OPSS-PEG-OPSS, MW 3.4K3400≥95% Pricing
AP14837OPSS-PEG-OPSS, MW 10K10000≥95% Pricing
AP14869OPSS-PEG-SVA, MW 2K2000≥95% Pricing
AP14870OPSS-PEG-SVA, MW 3.4K3400≥95% Pricing
AP14871OPSS-PEG-SVA, MW 5K5000≥95% Pricing
AP14872OPSS-PEG-SVA, MW 10K10000≥95% Pricing
AP14873OPSS-PEG-SVA, MW 20K20000≥95% Pricing
AP14796SAS-PEG-SAS, MW 1K1000≥95% Pricing
AP14792SAS-PEG-SAS, MW 2K2000≥95% Pricing
AP14793SAS-PEG-SAS, MW 3.4K3400≥95% Pricing
AP14797SAS-PEG-SAS, MW 5K5000≥95% Pricing
AP14794SAS-PEG-SAS, MW 10K10000≥95% Pricing
AP14795SAS-PEG-SAS, MW 20K20000≥95% Pricing
AP14820SG-PEG-SG, MW 2K2000≥95% Pricing
AP14821SG-PEG-SG, MW 3.4K3400≥95% Pricing
AP14822SG-PEG-SG, MW 5K5000≥95% Pricing
AP14823SG-PEG-SG, MW 10K10000≥95% Pricing
AP14790SS-PEG-SS, MW 1K1000≥95% Pricing
AP14782SS-PEG-SS, MW 2K2000≥95% Pricing
AP14783SS-PEG-SS, MW 3.4K3400≥95% Pricing
AP14791SS-PEG-SS, MW 5K5000≥95% Pricing
AP14784SS-PEG-SS MW 10K10000≥95% Pricing
Stearic acid-PEG-NHS
AP13504Stearic acid-PEG-NHS, MW 1K1000≥95% Pricing
AP13517Stearic acid-PEG-NHS, MW 2K2000≥95% Pricing
AP13532Stearic acid-PEG-NHS, MW 3.4K3400≥95% Pricing
AP13547Stearic acid-PEG-NHS, MW 5K5000≥95% Pricing
AP14779SVA-PEG-SVA, MW 1K1000≥95% Pricing
AP14780SVA-PEG-SVA, MW 3.4K3400≥95% Pricing
AP14781SVA-PEG-SVA, MW 5K5000≥95% Pricing

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