DALDA
DALDA is a potent and highly selective μ-opioid receptor agonist with a Ki of 1.69 nM. DALDA shows antinociceptive and respiratory effects.
For research use only. We do not sell to patients.
- CAS No.: 118476-85-0
- Formula: C30H45N9O5
- Molecular Weight:611.74
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Storage:
Please store the product under the recommended conditions in the Certificate of Analysis.
To place orders, for customer services and technical support, please contact: MedChemExpress USA
Tel: 609-228-6898 E-mail: [email protected] [email protected]
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Biological Activity
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Chemical Information
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Solvent & Solubility
- Purity & Documentation
- References
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Help & FAQs
All Opioid Receptor Isoforms
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Biological Activity
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μ Opioid Receptor/MOR 1.69 nM (Ki) |
κ Opioid Receptor/KOR 4230 nM (Ki) |
δ Opioid Receptor/DOR 19200 nM (Ki) |
DALDA carrys a net positive charge (3+) at physiological pH and is thus hydrophilic and more polar than morphine[1].
MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.
DALDA (0.1 and 1.0 μg/side; ICV; once) results in biphasic effects, with an initial suppression, an intermediate marked inhibition, followed by activation for horizontal movement, rearing and stereotypy times in rats[2].
MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.
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Animal Model:Male Sprague-Dawley rats (300–350 g)[1]
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Dosage:0.24, 0.7 and 7 nmol/rat
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Administration:Intrathecal injection, once
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Result:Showed antinociceptive effects with an ED50 of 237 pmol/rat in the rat tail-flick test. Inhibited the uptake of NE in spinal cord synaptosomes in a dose-dependent manner. Had no effect on 5-HT uptake. Produced depression in minute ventilation.
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Animal Model:Male Long-Evans rats, weighing 200-225 g[2]
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Dosage:0, 0.1 and 1.0 μg/side, 0.5 μL
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Administration:Lateral cerebral ventricle injection, once
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Result:Elicited a significant biphasic effect with an initial suppression, an intermediate marked inhibition, followed by significant activation for horizontal movement time, rearing time, and stereotypy time.
Chemical Information
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CAS No. 118476-85-0
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Molecular Weight 611.74
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Formula C30H45N9O5
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Sequence Shortening
Y-{D-Arg}-FK-NH2
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Shipping
Room temperature in continental US; may vary elsewhere.
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Storage
Please store the product under the recommended conditions in the Certificate of Analysis.
Solvent & Solubility
H2O
Peptide Solubility and Storage Guidelines:
1. Calculate the length of the peptide.
2. Calculate the overall charge of the entire peptide according to the following table:
| Contents | Assign value | |
|---|---|---|
| Acidic amino acid | Asp (D), Glu (E), and the C-terminal -COOH. | -1 |
| Basic amino acid | Arg (R), Lys (K), His (H), and the N-terminal -NH2 | +1 |
| Neutral amino acid | Gly (G), Ala (A), Leu (L), Ile (I), Val (V), Cys (C), Met (M), Thr (T), Ser (S), Phe (F), Tyr (Y), Trp (W), Pro (P), Asn (N), Gln (Q) | 0 |
3. Recommended solution:
| Overall charge of peptide | Details |
|---|---|
| Negative (<0) |
1. Try to dissolve the peptide in water first. 2. If water fails, add NH4OH (<50 μL). 3. If the peptide still does not dissolve, add DMSO (50-100 μL) to solubilize the peptide. |
| Positive (>0) |
1. Try to dissolve the peptide in water first. 2. If water fails, try dissolving the peptide in a 10%-30% acetic acid solution. 3. If the peptide still does not dissolve, try dissolving the peptide in a small amount of DMSO. |
| Zero (=0) |
1. Try to dissolve the peptide in organic solvent (acetonitrile, methanol, etc.) first. 2. For very hydrophobic peptides, try dissolving the peptide in a small amount of DMSO, and then dilute the solution with water to the desired concentration. |
Purity & Documentation
References
[1]. Shimoyama M, et al. Antinociceptive and respiratory effects of intrathecal H-Tyr-D-Arg-Phe-Lys-NH2 (DALDA) and [Dmt1] DALDA. Journal of Pharmacology and Experimental Therapeutics, 2001, 297(1): 364-371. [Content Brief]
[2]. Meyer ME, et al. DALDA (H-Tyr-D-Arg-Phe-Lys-NH2), a potent mu-opioid peptide agonist, affects various patterns of locomotor activities. Pharmacol Biochem Behav. 1995 May;51(1):149-51. [Content Brief]
Calculators
Concentration (start) × Volume (start) = Concentration (final) × Volume (final)
DALDA Related Classifications
HY-P3870 Related Classifications
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