Protein Modification Reagents

Chemical agents used to modify the amino acid side chains of proteins in order to alter their native charges, block or expose reactive binding sites, inactivate functional groups, and change functional groups to create targets for crosslinking and labeling.

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4,351 – 4,365 of 5,663 results

4,351

Medchemexpress LLC HS-PEG-SH (MW 3400) | 97.0% | 50 MG

HS-PEG-SH (MW 3400) is a linear homobifunctional PEG cross-linker designed for various biochemical applications. It is utilized in drug delivery systems and for the preparation of PEG hydrogels, offering versatility for research purposes. This product has an average molecular weight of 3400 and a purity of 97.0%.

Linear homobifunctional PEG
Cross-linker for biochemical applications
Utilized for drug delivery
Suitable for preparing PEG hydrogels
97.0% purity
Average molecular weight of 3400
Appears as a solid
Color ranges from white to light yellow

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4,352

eMolecules 557756-85-1 | Fmoc-NH-PEG4-CH2CH2COOH | ChemScene | MFCD06656472 | 487.549 | C26H33NO8 | 96.000 | OC(=O)CCOCCOCCOCCOCCNC(=O)OCC1c2ccccc2-c2ccccc12 | 100mg | 642097511

Fmoc-NH-PEG4-CH2CH2COOH | ChemScene | 557756-85-1 | MFCD06656472 | 487.549 | C26H33NO8 | 96.000 | OC(=O)CCOCCOCCOCCOCCNC(=O)OCC1c2ccccc2-c2ccccc12 | 100mg | 642097511

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4,353

eMolecules 1895922-73-2 | Aminooxy-PEG3-bromide | Broadpharm | MFCD29764339 | 272.139 | C8H18BrNO4 | 98.000 | NOCCOCCOCCOCCBr | 1g | 311074478

Aminooxy-PEG3-bromide | Broadpharm | 1895922-73-2 | MFCD29764339 | 272.139 | C8H18BrNO4 | 98.000 | NOCCOCCOCCOCCBr | 1g | 311074478

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4,354

eMolecules 1807530-10-4 | AZIDO-PEG3-ALDEHYDE | AstaTech | MFCD28976706 | 231.252 | C9H17N3O4 | 95.000 | [N-]=[N+]=NCCOCCOCCOCCC=O | 0.25g | 570586065

AZIDO-PEG3-ALDEHYDE | AstaTech | 1807530-10-4 | MFCD28976706 | 231.252 | C9H17N3O4 | 95.000 | [N-]=[N+]=NCCOCCOCCOCCC=O | 0.25g | 570586065

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4,355

eMolecules 1345681-74-4 | Mal-PEG1-PNP-carbonate | Broadpharm350.283 | C15H14N2O8 | 98.000 | [O-][N+](=O)c1ccc(OC(=O)OCCOCCN2C(=O)C=CC2=O)cc1 | 100mg | 573896599

Mal-PEG1-PNP-carbonate | Broadpharm | 1345681-74-4350.283 | C15H14N2O8 | 98.000 | [O-][N+](=O)c1ccc(OC(=O)OCCOCCN2C(=O)C=CC2=O)cc1 | 100mg | 573896599

Pricing & Availability

4,356

eMolecules 2839527-02-3 | N-(m-PEG4)-N'-(PEG3-Mal)-Cy5 | Broadpharm | MFCD30182067 | 907.540 | C49H67ClN4O10 | 95.000 | [Cl-].COCCOCCOCCOCC[N+]1=C(\C=C\C=C\C=C2\N(CCOCCOCCOCCNC(=O)CCN3C(=O)C=CC3=O)c3ccccc3C2(C)C)C(C)(C)c2ccccc12 | 1mg | 311074481

N-(m-PEG4)-N'-(PEG3-Mal)-Cy5 | Broadpharm | 2839527-02-3 | MFCD30182067 | 907.540 | C49H67ClN4O10 | 95.000 | [Cl-].COCCOCCOCCOCC[N+]1=C(\C=C\C=C\C=C2\N(CCOCCOCCOCCNC(=O)CCN3C(=O)C=CC3=O)c3ccccc3C2(C)C)C(C)(C)c2ccccc12 | 1mg | 311074481

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4,357

Research Products International Corp PEG 8000, 25 KG

Ultrapure white crystals for molecular biology applications such as precipitation of DNA, nucleic acids, hybridization and fusion of mammalian cells.Melting Point: 55°-60°C

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4,358

eMolecules 2135793-73-4 | m-PEG12-acid | Broadpharm | MFCD08274611 | 588.688 | C26H52O14 | 90.000 | COCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCC(O)=O | 1g | 200622525

m-PEG12-acid | Broadpharm | 2135793-73-4 | MFCD08274611 | 588.688 | C26H52O14 | 90.000 | COCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCC(O)=O | 1g | 200622525

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4,359

Broadpharm endo-BCN-PEG8-NHS ester | 1608140-48-2 | MFCD31692212 | 50mg

endo-BCN-PEG8-NHS ester | Putity: 98% | MW: 714.8 | 1608140-48-2 | MFCD31692212 | 50mg

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4,360

Medchemexpress LLC Pomalidomide-Peg1-Azide 10Mg | HY-133138-10MG

Pomalidomide-Peg1-Azide 10Mg

Pricing & Availability

4,361

Medchemexpress LLC Biotin-PEG4-PFP ester | 1334172-58-5 | 96.2% | 657.65 g/mol | C27H36F5N3O8S | 25 MG

Biotin-PEG4-PFP ester is a biotinylated, cleavable PEG4 linker with a pentafluorophenyl (PFP) ester reactive group, designed for conjugation to amine-containing molecules in ADC, PROTAC, and general biotinylation workflows.

Cleavable four-unit PEG spacer to increase solubility and flexibility.
PFP ester reactive group for efficient coupling to primary and secondary amines.
Biotin tag enables affinity capture, detection, and pull-down assays.
White to off-white solid with defined storage stability in frozen conditions.
High purity suitable for research applications and conjugation chemistry.

Pricing & Availability

4,362

Medchemexpress LLC Biotin-PEG4-MeTz | 1962919-31-8 | C31H46N8O7S | 5 MG

Biotin-PEG4-MeTz is a click chemistry reagent that contains a terminal methyltetrazine group, which reacts with trans-cyclooctene. It can be used to prepare biotinylated conjugates.

Purity: 95.32%
Molecular weight: 674.81
Appearance: Solid
Color: Purple to purplish red
Storage: -20°C, sealed, away from moisture and light
In solvent storage: -80°C for 6 months or -20°C for 1 month (sealed, away from moisture and light)
Solubility in DMSO: 250 mg/mL (370.47 mM), requires ultrasonication
Designed for click chemistry applications

Pricing & Availability

4,363

eMolecules Methyltetrazine-PEG5-DBCO | Broadpharm |738.842 | C40H46N6O8 | 98.000 | Cc1nnc(nn1)-c1ccc(OCCOCCOCCOCCOCCOCCNC(=O)CCC(=O)N2Cc3ccccc3C#Cc3ccccc23)cc1 | 25mg | 698442875

Methyltetrazine-PEG5-DBCO | Broadpharm |738.842 | C40H46N6O8 | 98.000 | Cc1nnc(nn1)-c1ccc(OCCOCCOCCOCCOCCOCCNC(=O)CCC(=O)N2Cc3ccccc3C#Cc3ccccc23)cc1 | 25mg | 698442875

Pricing & Availability

4,364

Medchemexpress LLC DSPE-PEG 2000 | 892144-24-0 | 99.37% | (C2H4O)nC42H82NO10P | 250 MG

DSPE-PEG 2000 is a PEG polymer that contains DSPE and amine end groups. It can be utilized to form micelles as nanoparticles for drug delivery and is intended for research use only.

Contains DSPE and amine end groups
Can be used to form micelles as nanoparticles for drug delivery
For research use only
Solid appearance
White to off-white color
Powder storage: -20°C for 3 years
In solvent storage: -80°C for 6 months, -20°C for 1 month

Pricing & Availability

4,365

Cayman Chemical VH 032 LInker 1 25mg

A PROTAC precursor; has been used in the synthesis of PROTACs targeting TEAD in cancer cells

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Protein Modification Reagents

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Medchemexpress LLC HS-PEG-SH (MW 3400) | 97.0% | 50 MG Small and Specialty Supplier PartnerSmall and/or specialty supplier based on Federal laws and SBA requirements.Learn More

Research Products International Corp PEG 8000, 25 KG Small and Specialty Supplier PartnerSmall and/or specialty supplier based on Federal laws and SBA requirements.Learn More

Medchemexpress LLC Pomalidomide-Peg1-Azide 10Mg | HY-133138-10MG Small and Specialty Supplier PartnerSmall and/or specialty supplier based on Federal laws and SBA requirements.Learn More

Medchemexpress LLC Biotin-PEG4-PFP ester | 1334172-58-5 | 96.2% | 657.65 g/mol | C27H36F5N3O8S | 25 MG Small and Specialty Supplier PartnerSmall and/or specialty supplier based on Federal laws and SBA requirements.Learn More

Medchemexpress LLC Biotin-PEG4-MeTz | 1962919-31-8 | C31H46N8O7S | 5 MG Small and Specialty Supplier PartnerSmall and/or specialty supplier based on Federal laws and SBA requirements.Learn More

Medchemexpress LLC DSPE-PEG 2000 | 892144-24-0 | 99.37% | (C2H4O)nC42H82NO10P | 250 MG Small and Specialty Supplier PartnerSmall and/or specialty supplier based on Federal laws and SBA requirements.Learn More

Cayman Chemical VH 032 LInker 1 25mg Small and Specialty Supplier PartnerSmall and/or specialty supplier based on Federal laws and SBA requirements.Learn More