What is Net Peptide Content and why does it matter?

Net Peptide Content (NPC) is the percentage of the gross vial weight that is actually active peptide amino acids. The remaining mass consists of counterions (typically trifluoroacetate or acetate salts from HPLC purification) and bound water molecules. NPC typically ranges from 70 to 90 percent. If a vial labeled 1 mg has 75 percent NPC, it contains only 0.75 mg of actual peptide. Ignoring NPC creates a 25 percent concentration error that is unacceptable for sensitive assays like enzyme kinetics or receptor binding studies. The peptide dilution calculator adjusts for NPC when the value from the Certificate of Analysis is entered.

What solvent should I use to reconstitute my peptide?

Follow a tiered approach. Tier 1: Try sterile distilled water first — works for most hydrophilic peptides rich in charged residues (Arg, Lys, Asp, Glu). Tier 2: If water fails, adjust pH. For basic peptides, add 10 percent acetic acid dropwise. For acidic peptides, add dilute ammonium hydroxide. Tier 3: For hydrophobic peptides rich in Leu, Val, Phe, or Trp, use DMSO (dimethyl sulfoxide) or acetonitrile. Always test solubility with a small amount before committing the entire vial. The peptide dilution calculator computes volumes regardless of solvent — the choice of solvent is a chemistry decision based on the amino acid sequence.

Can I store reconstituted peptides at 4 degrees Celsius?

Only for hours to a few days at most. Hydrolysis (especially at Asp residues) and oxidation (at Cys and Met residues) proceed even at refrigerator temperature. Bacterial contamination is also a risk in aqueous solutions. For any storage beyond same-day use, aliquot the reconstituted stock into single-use volumes (20 to 50 microliters) and freeze at minus 20 or minus 80 degrees Celsius. Never refreeze a thawed aliquot — ice crystal formation during refreezing damages peptide structure through physical shearing of bonds.

Why does my peptide form a gel or precipitate when I add water?

The peptide is too hydrophobic to dissolve in aqueous solution. Hydrophobic residues (leucine, valine, phenylalanine, tryptophan, isoleucine) create a peptide that prefers to aggregate rather than interact with water molecules. Solution: do not add more water. Instead, add a small volume of DMSO or 10 percent acetic acid to the precipitate to resolubilize it. Always test solubility with a tiny portion of the peptide before committing the entire vial. The peptide dilution calculator computes correct volumes but cannot predict solubility — that requires examining the amino acid sequence.

Should I vortex or sonicate to dissolve peptides?

Gentle vortexing is generally safe. Vigorous shaking or prolonged vortexing introduces air, which can oxidize sensitive residues (cysteine, methionine, tryptophan). Brief low-intensity sonication in a water bath (not a probe sonicator) effectively breaks up aggregates without generating destructive shear forces. Keep the vial on ice during sonication because ultrasonic energy generates heat that can denature the peptide. Never shake a peptide solution vigorously — foaming indicates protein denaturation at the air-liquid interface.

Why should I centrifuge the vial before opening?

During shipping and handling, the lyophilized peptide powder can scatter throughout the vial — adhering to the walls, the cap, and the threading. If you open the vial without centrifuging first, a significant portion of the peptide may be lost on the cap or become airborne. A brief pulse spin (5 to 10 seconds in a microcentrifuge) consolidates all material at the bottom of the vial, ensuring you have access to the full labeled weight when you add solvent. This is especially critical for sub-milligram quantities.

Can I autoclave peptide solutions for sterilization?

Absolutely not. Autoclaving subjects solutions to 121 degrees Celsius and 15 psi pressure for 15 to 30 minutes — conditions that completely destroy peptide structure through hydrolysis, deamidation, and aggregation. For sterile peptide solutions, use 0.22 micrometer syringe filtration with low-protein-binding membranes (PVDF or PES, not cellulose acetate). Filter the concentrated stock solution before diluting to working concentration, because the percentage of peptide lost to membrane adsorption is proportionally smaller at higher concentrations.

What is the shelf life of lyophilized versus reconstituted peptides?

Lyophilized peptides stored desiccated at minus 20 degrees Celsius are stable for years — some manufacturers guarantee 2 to 5 years. Once reconstituted into liquid, stability drops dramatically: days at 4 degrees Celsius, weeks to months at minus 20, and up to 6 months at minus 80 in single-use aliquots. The primary degradation pathways are hydrolysis (water attacks peptide bonds), oxidation (oxygen reacts with Cys, Met, Trp residues), and microbial contamination in non-sterile solutions. Aliquoting immediately after reconstitution is the single most important step for preserving peptide activity.

My peptide has a disulfide bridge — does this change reconstitution?

Yes. Disulfide bridges (Cys-Cys bonds) make the peptide more rigid and potentially harder to dissolve. More importantly, you must avoid reducing agents in your solvent or buffer — DTT (dithiothreitol), beta-mercaptoethanol, and TCEP will break the disulfide bridge, unfolding the peptide and destroying its biological activity. Use non-reducing buffers only. Also avoid strongly alkaline conditions (pH above 8) which can catalyze disulfide scrambling. Check your reconstitution buffer for any hidden reducing components before use.

Is TFA from peptide synthesis toxic to cells?

Trifluoroacetic acid (TFA) is the most common counterion in synthetic peptides from HPLC purification. At the trace levels present in standard peptide preparations, TFA is generally well tolerated by most cell lines. However, sensitive cells (primary neurons, stem cells, certain immune cells) may show toxicity at TFA concentrations above 0.01 percent. If this is a concern, request acetate salt or TFA-free peptides from your supplier. Alternatively, lyophilize and re-dissolve the peptide in acetate buffer to exchange the counterion.

Where can I find more laboratory calculator tools?

Visit DilutionsCalculator.com for a complete suite of free tools including general dilution (C1V1=C2V2), molarity calculator, serial dilution table generator, mg/mL converter, PPM calculator, pharmaceutical dilution, hydrogen peroxide dilution, weight-by-volume, and acid dilution calculators. The peptide dilution calculator on this page integrates with the general dilution tool for downstream working-concentration preparation. All tools are free, mobile-responsive, and require no registration.

Peptide Dilution Calculator: Complete Guide to Reconstitution & Handling (2025)

Biochemistry & Laboratory Protocols

Peptide Dilution Calculator: Complete Guide to Reconstitution & Handling

Q: What is a peptide dilution calculator?

A peptide dilution calculator is a specialized tool that computes the exact volume of solvent needed to reconstitute lyophilized (freeze-dried) peptide powder to a target concentration. It supports both mass-based calculations (mg/mL) and molar-based calculations (mM, µM) requiring molecular weight input. Advanced versions include Net Peptide Content (NPC) adjustment to account for counterions and bound water that inflate the gross weight on the vial label. The calculator eliminates arithmetic errors that waste expensive peptide material and ensures reproducible concentrations for biological assays.

Q: How do I convert between mg/mL and molar concentration for peptides?

Molarity equals mass concentration in mg/mL divided by molecular weight in g/mol, then multiplied by 1000 to convert to millimolar. For example, 1 mg/mL of a peptide with MW 1500 g/mol equals (1 divided by 1500) times 1000 equals 0.667 mM. The peptide dilution calculator handles both directions of this conversion. The molar mode accepts mass, molecular weight, and target molarity, then outputs the solvent volume needed. Molarity is preferred for biological assays because receptors bind individual molecules, not mass.

Q: What is the DMSO solvent crash and how do I avoid it?

When a peptide dissolved in 100 percent DMSO is rapidly diluted into an aqueous buffer, the sudden polarity change causes the peptide to precipitate out of solution as visible particles or a milky suspension. To avoid this, add the DMSO-peptide stock dropwise into the aqueous buffer while continuously vortexing the buffer. This gradual introduction allows the peptide to acclimate to the changing solvent environment. Also keep the final DMSO concentration below 0.1 to 0.5 percent in cell culture experiments to avoid cytotoxicity.

Q: How do I prevent peptide loss from tube adsorption?

At low concentrations (below 0.1 mg/mL), peptides adsorb to plastic tube walls through hydrophobic and electrostatic interactions. This can result in losing 30 to 50 percent or more of the peptide. Mitigation strategies include adding 0.1 percent BSA (bovine serum albumin) as a carrier protein to coat the plastic surface, using low-protein-binding tubes (siliconized or LoBind), and preparing stock solutions at higher concentrations then diluting just before use. The peptide dilution calculator helps plan a concentrated stock to minimize this loss.

Reconstitute lyophilized peptides with precision using our free 2-mode calculator. Supports mass-based (mg/mL) and molar (mM/µM) calculations with NPC adjustment, solvent selection guidance, aliquoting protocols, and 15 expert FAQs.

July 2025 Expert Verified 35 Min Read

1. Introduction — Why Peptide Reconstitution Demands Precision

Peptides — short chains of amino acids serving as hormones, signaling molecules, antimicrobial agents, and research ligands — arrive at laboratories worldwide as lyophilized (freeze-dried) white powder in small glass vials. The process of transforming this fragile, expensive solid into a functional, accurately concentrated liquid solution is called reconstitution, and it is far more complex than simply “adding water.” Solubility issues, aggregation, oxidation, adsorption to tube walls, and arithmetic errors all threaten to waste material that can cost hundreds of dollars per milligram.

A dedicated peptide dilution calculator eliminates the mathematical component of this risk. It computes the exact volume of solvent needed to achieve a target concentration — in either mass-based (mg/mL) or molar (mM, µM) units — and optionally adjusts for Net Peptide Content (NPC), the often-overlooked distinction between gross vial weight and actual active peptide content. This guide covers the complete theory and practice of peptide reconstitution, from the physics of solubility to the chemistry of degradation, with a free embedded calculator and 15 expert FAQs.

Lyophilized peptide vial and pipette used with peptide dilution calculator for reconstitution

The peptide dilution calculator bridges the gap between lyophilized powder and precisely concentrated solution.

For downstream dilution of the reconstituted stock to working concentrations, our general dilution calculator handles C₁V₁=C₂V₂. For molar preparations from solid reagents, our molarity calculator computes mass-to-concentration conversions.

2. Lyophilization — Understanding What Arrives in the Vial

Peptides are synthesized in liquid phase but shipped as solids to prevent hydrolysis and oxidation during transport. Lyophilization (freeze-drying) removes water by sublimation under vacuum, leaving behind a porous cake or thin film of peptide. This structure is highly hygroscopic — it absorbs moisture from air rapidly upon opening, which is why vials must equilibrate to room temperature before opening (to prevent condensation) and why reconstituted solutions should be used or frozen promptly.

Researchers often open sub-milligram vials and see nothing visible — the peptide may exist as a transparent film on the glass walls or a microscopic speck at the bottom. This is normal and highlights why you must trust the manufacturer’s weight specification and centrifuge the vial before opening, rather than relying on visual estimation. The peptide dilution calculator uses the labeled mass (adjusted for NPC if provided) as its input, not what you can see.

Glass vial containing lyophilized peptide for peptide dilution calculator reconstitution

Lyophilized peptide may be invisible in the vial.

Analytical balance for weighing peptide mass in peptide dilution calculator workflow

Precise mass is critical for concentration accuracy.

Aliquot tubes for storing reconstituted peptide dilution calculator prepared solutions

Aliquoting preserves peptide through freeze-thaw cycles.

3. Net Peptide Content — The Most Common Source of Error

The weight printed on the vial (e.g., “1 mg”) is the gross weight, not the weight of active peptide. During synthesis and HPLC purification, peptides attract counterions (trifluoroacetate or acetate salts) and retain bound water molecules. These non-peptide components typically constitute 10–30% of the gross weight.

Gross Weight = Peptide + Counterions + Bound Water

Net Peptide Content (NPC) is the percentage of gross weight that is actual peptide. It typically ranges from 70% to 90%. A 1 mg vial with 75% NPC contains only 0.75 mg of active peptide. If you assume 1 mg and add 1 mL of water, your true concentration is 0.75 mg/mL, not 1.0 mg/mL — a 25% error. The peptide dilution calculator adjusts for NPC when the value from the Certificate of Analysis (CoA) is entered, producing the corrected solvent volume.

4. Mass Concentration vs. Molar Concentration

Mass-Based (mg/mL)

$$ \text{Volume (mL)} = \frac{\text{Mass (mg)}}{\text{Target Concentration (mg/mL)}} $$

Simple and practical for general dosing. However, it ignores molecular size — 1 mg/mL of a small dipeptide contains far more molecules than 1 mg/mL of a large 50-amino-acid peptide.

Molar-Based (M, mM, µM)

$$ \text{Volume (L)} = \frac{\text{Mass (g)}}{\text{Molarity (mol/L)} \times \text{MW (g/mol)}} $$

Biology operates on molarity because receptors bind individual molecules. The peptide dilution calculator’s molar mode accepts mass, molecular weight (from the datasheet or PubChem), and target molarity, then outputs the solvent volume in both mL and µL.

Molecular weight reference chart used alongside peptide dilution calculator for molar calculations

Molecular weight from the CoA or datasheet is required for the molar mode of the peptide dilution calculator.

5. Free Peptide Dilution Calculator

Two modes: mass-based (mg/mL target) and molar-based (mM/µM target requiring molecular weight). Both support optional NPC adjustment for maximum accuracy.

Peptide Dilution Calculator

Peptide Mass (mg)

Target Concentration (mg/mL)

Net Peptide Content % (optional)From Certificate of Analysis. Adjusts mass for counterions/water.

Reconstitution Result

6. Solvent Selection — The Decision Tree

Never blindly add water to the entire vial. Once water contacts a hydrophobic peptide, it may form an irrecoverable gel or precipitate. Follow this tiered approach, testing with a small portion first:

Tier 1 — Sterile distilled water: Works for most hydrophilic peptides rich in charged residues (Arg, Lys, Asp, Glu). Always try water first.
Tier 2 — pH adjustment: For basic peptides (Arg/Lys-rich), add 10% acetic acid dropwise. For acidic peptides (Asp/Glu-rich), add dilute ammonium hydroxide. Moving pH away from the isoelectric point (pI) increases net charge and solubility.
Tier 3 — Organic solvents: For hydrophobic peptides (rich in Leu, Val, Phe, Trp), use DMSO, DMF, or acetonitrile. DMSO is most common because it is miscible with water and relatively cell-compatible at low concentrations.

The peptide dilution calculator computes volumes regardless of solvent choice — the solvent decision is a chemistry judgment based on the amino acid sequence.

Solvents and buffers for peptide dilution calculator reconstitution workflow

Water, acetic acid, and DMSO — the three tiers of the solvent decision tree.

7. Step-by-Step Reconstitution Protocol

Equilibrate: Allow sealed vial to warm to room temperature (15–30 min). Opening cold vials causes condensation that degrades the peptide.
Centrifuge: Pulse spin 5–10 seconds in a microcentrifuge to consolidate powder at the bottom.
Calculate: Use the peptide dilution calculator above. Enter mass, target concentration, and NPC if available.
Add solvent: Pipette the calculated volume down the inside wall of the vial — do not inject directly onto the powder cake.
Dissolve: Vortex gently or sonicate briefly in a water bath (on ice). Do NOT shake vigorously — foaming indicates denaturation at the air-liquid interface.
Inspect: Hold vial to light. Solution must be crystal clear. Any cloudiness indicates incomplete dissolution or precipitation.
Aliquot immediately: Divide into single-use volumes (20–50 µL) in low-binding tubes. Freeze at −80°C. Never refreeze thawed aliquots.

8. Handling DMSO — Avoiding the “Solvent Crash”

When a peptide dissolved in 100% DMSO is rapidly diluted into aqueous buffer, the sudden polarity change causes the peptide to crash out of solution as visible particles. To avoid this, add the DMSO-peptide stock dropwise into the aqueous buffer while continuously vortexing the buffer. This gradual introduction allows the peptide to acclimate. Keep the final DMSO concentration below 0.1–0.5% in cell culture experiments to avoid cytotoxicity. The peptide dilution calculator provides the DMSO stock volume; the dropwise addition technique is the physical complement.

9. Storage, Aliquoting & Stability

Peptides are chemically unstable in solution. The three primary degradation pathways are:

Oxidation: Cysteine (Cys) and methionine (Met) residues react with dissolved oxygen. Minimize headspace in vials or flush with argon/nitrogen gas.
Hydrolysis: Water attacks peptide bonds, especially near aspartic acid (Asp) residues. Avoid prolonged storage in aqueous solution.
Freeze-thaw damage: Ice crystals physically shear peptide bonds. Single-use aliquots prevent repeated freeze-thaw cycles.

The Golden Rule: Aliquot Immediately

After reconstitution with the peptide dilution calculator volumes, immediately divide the stock into single-use aliquots (20–50 µL). Freeze at −80°C. Thaw one tube per experiment. Discard any remaining liquid after use. Never refreeze. This single practice prevents more peptide degradation than any other handling technique.

Labeled aliquot tubes stored at minus 80 from peptide dilution calculator reconstitution

Labeled single-use aliquots at −80°C preserve peptide activity for months.

10. Preventing Adsorption Loss at Low Concentrations

At concentrations below 0.1 mg/mL, peptides adsorb to plastic tube walls through hydrophobic and electrostatic interactions, losing 30–50% or more of the material. Mitigation strategies include: (1) adding 0.1% BSA (bovine serum albumin) as a carrier protein to coat the plastic, (2) using low-protein-binding tubes (siliconized or LoBind), and (3) preparing stocks at higher concentrations with the peptide dilution calculator and diluting just before use with our general dilution calculator.

11. Sterilization for Cell Culture

Never autoclave peptide solutions — 121°C destroys them instantly through hydrolysis and deamidation. Instead, use 0.22 µm syringe filtration with low-protein-binding membranes (PVDF or PES, not cellulose acetate which adsorbs peptides). Filter the concentrated stock before diluting to working concentration, because the percentage lost to membrane adsorption is proportionally smaller at higher concentrations.

12. Troubleshooting Guide

Symptom	Cause	Solution
Cloudy solution	Peptide insoluble in chosen solvent	Try pH adjustment or DMSO. Do not use cloudy solution.
Gel/jelly formation	Concentration exceeds solubility limit	Add more solvent. Sonicate gently on ice.
No biological effect	Degradation from improper storage	Check storage logs. Was it freeze-thawed? Room temp?
Yellow solution	Oxidation of Trp/Tyr residues	Discard. Prepare fresh with argon-flushed vial.
Less mass than labeled	NPC not accounted for, or powder on cap	Centrifuge before opening. Adjust with NPC in calculator.
Concentration lower than expected	Adsorption to plastic tubes	Use LoBind tubes or add 0.1% BSA carrier.

Related Tools

General Dilution Calculator
C₁V₁=C₂V₂ for working dilutionsOpen
Molarity Calculator
Mass-to-molar conversionOpen
Serial Dilution Calculator
Standard curves from peptide stocksOpen

13. Frequently Asked Questions

1. What is a peptide dilution calculator?

A peptide dilution calculator computes the exact volume of solvent needed to reconstitute lyophilized peptide powder to a target concentration. It supports mass-based (mg/mL) and molar-based (mM, µM) calculations, and optionally adjusts for Net Peptide Content (NPC) to account for counterions and bound water. The tool eliminates arithmetic errors that waste expensive peptide material and ensures reproducible concentrations for biological assays.

2. What is Net Peptide Content (NPC)?

NPC is the percentage of gross vial weight that is actual peptide amino acids (typically 70–90%). The remainder is counterions (TFA/acetate salts) and bound water from synthesis/purification. A 1 mg vial with 75% NPC contains only 0.75 mg of active peptide. The peptide dilution calculator adjusts for NPC when the CoA value is entered, producing a corrected solvent volume that accounts for this non-peptide mass.

3. What solvent should I use?

Tier 1: Sterile distilled water (for charged, hydrophilic peptides). Tier 2: pH-adjusted water — 10% acetic acid for basic peptides, dilute NH₄OH for acidic ones. Tier 3: DMSO for hydrophobic peptides. Always test with a small portion first. The peptide dilution calculator computes volumes regardless of solvent — the choice is based on the amino acid sequence and documented solubility data.

4. Can I store reconstituted peptide at 4°C?

Only for hours to a few days. Hydrolysis and oxidation proceed even at refrigerator temperature. For any storage beyond same-day use, aliquot the stock (prepared with the peptide dilution calculator volumes) into single-use tubes and freeze at −20°C or −80°C. Never refreeze a thawed aliquot.

5. Why does my peptide precipitate when I add water?

The peptide is too hydrophobic for aqueous dissolution. Residues like Leu, Val, Phe, and Trp create a peptide that aggregates rather than interacting with water. Do not add more water — instead, add DMSO or 10% acetic acid to the precipitate. The peptide dilution calculator gives correct volumes but cannot predict solubility; that requires examining the amino acid sequence.

6. How do I convert mg/mL to mM?

mM = (mg/mL ÷ MW in g/mol) × 1000. For example, 1 mg/mL of a peptide with MW 1500: (1 ÷ 1500) × 1000 = 0.667 mM. The peptide dilution calculator handles both directions — enter in mass mode or molar mode depending on your protocol’s requirements.

7. Should I vortex or sonicate?

Gentle vortexing is safe. Brief low-intensity sonication in a water bath (not probe sonicator) effectively breaks aggregates. Keep the vial on ice during sonication to prevent heat denaturation. Never shake vigorously — foaming indicates protein denaturation at the air-liquid interface. The peptide dilution calculator provides volumes; dissolution technique is the physical complement.

8. Why centrifuge the vial before opening?

Lyophilized powder scatters during shipping — it may adhere to the walls, cap, or threading. A 5–10 second pulse spin consolidates all material at the bottom, ensuring you access the full labeled weight. This is critical for sub-milligram quantities where losing powder on the cap represents a significant percentage of the total.

9. What is the DMSO “solvent crash”?

When a peptide in 100% DMSO is rapidly dumped into aqueous buffer, the polarity change causes precipitation. Solution: add the DMSO stock dropwise into buffer while vortexing. Keep final DMSO below 0.1–0.5% for cell culture. The peptide dilution calculator computes the DMSO stock volume; you control the addition rate.

10. How do I prevent adsorption to tubes?

Below ~0.1 mg/mL, peptides stick to plastic, losing 30–50%. Add 0.1% BSA as carrier protein, use LoBind tubes, or prepare concentrated stocks (using the peptide dilution calculator) and dilute immediately before use with our dilution calculator.

11. Can I autoclave peptide solutions?

Never. 121°C destroys peptides through hydrolysis, deamidation, and aggregation. Use 0.22 µm syringe filtration with low-protein-binding membranes (PVDF or PES). Filter the concentrated stock before diluting to working concentration to minimize percentage loss to membrane adsorption.

12. What is the shelf life of lyophilized vs. reconstituted peptide?

Lyophilized: years at −20°C (manufacturers guarantee 2–5 years). Reconstituted: days at 4°C, weeks to months at −20°C, up to 6 months at −80°C in single-use aliquots. Degradation pathways include hydrolysis, oxidation, and microbial contamination. Aliquoting immediately after using the peptide dilution calculator is the single most important preservation step.

13. My peptide has a disulfide bridge — does this matter?

Yes. Avoid reducing agents (DTT, β-mercaptoethanol, TCEP) in your buffer — they break disulfide bridges and destroy structure. Avoid alkaline pH (>8) which catalyzes disulfide scrambling. The peptide dilution calculator math is unchanged, but buffer composition requires extra care.

14. Is TFA from synthesis toxic to cells?

At trace levels in standard preparations, TFA is tolerated by most cell lines. Sensitive cells (primary neurons, stem cells) may show toxicity above 0.01%. Request acetate-salt or TFA-free peptides from your supplier if this is a concern. Alternatively, lyophilize and re-dissolve in acetate buffer to exchange the counterion. The peptide dilution calculator NPC adjustment accounts for the mass contribution of TFA salts.

15. Where can I find more calculator tools?

Visit DilutionsCalculator.com for molarity, serial dilution, mg/mL, PPM, pharmaceutical, H₂O₂, and acid dilution calculators — all free, no registration.

14. Conclusion — From Powder to Publication-Ready Data

Peptide reconstitution bridges the gap between chemical synthesis and biological discovery. The peptide dilution calculator eliminates the mathematical risk — computing exact solvent volumes for mass-based or molar targets with optional NPC correction. But the tool is only as good as the physical technique that follows: equilibrating to room temperature, centrifuging before opening, choosing the right solvent tier, dissolving gently without foaming, inspecting for clarity, and aliquoting immediately for frozen storage.

This guide has covered the complete workflow: lyophilization principles, NPC adjustment, mass vs. molar concentration math, a free 2-mode calculator, the solvent decision tree, step-by-step protocol, DMSO handling, storage and aliquoting, adsorption prevention, sterile filtration, troubleshooting, and 15 detailed FAQs. By combining verified calculator output with disciplined technique, you protect your research investment and ensure reproducible data from every vial.

Bookmark this page and our complete calculator suite for instant access whenever your next vial arrives.

References:
PubChem — Molecular Weight Database
ExPASy ProtParam — pI & MW Calculator
NCBI PubMed — Peptide Stability Research
Sigma-Aldrich — Peptide Handling Guide
Thermo Fisher — Reconstitution Protocols

Reconstitute with Precision

Use our free peptide dilution calculator and complete laboratory tool suite — no sign-up required.

Explore All Calculators

Peptide Dilution Calculator – Free Online Tool for Accurate Lab Results