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O4375

Sigma-Aldrich

Oxytocin

lyophilized powder, ~15 IU/mg solid (Prepared from synthetic oxytocin)

Synonym(s):

α-Hypophamine, Oxytocic hormone

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250 I.U.
€20.40
1000 I.U.
€62.20

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Estimated to ship onMarch 05, 2026Details

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250 I.U.
€20.40
1000 I.U.
€62.20

About This Item

Empirical Formula (Hill Notation):
C43H66N12O12S2
CAS Number:
50-56-6
Molecular Weight:
1007.19
Beilstein:
3586108
MDL number:
MFCD00076731
UNSPSC Code:
51111800
PubChem Substance ID:
24897994
NACRES:
NA.32
biological source:
synthetic
form:
lyophilized powder

€20.40

Estimated to ship onMarch 05, 2026Details

Request a Bulk Order

biological source

synthetic

Quality Level

200

sterility

non-sterile

form

lyophilized powder

specific activity

~15 IU/mg solid (Prepared from synthetic oxytocin)

solubility

water: 10 mg/mL, clear, colorless

UniProt accession no.

P01178
P30559
P70536

shipped in

ambient

storage temp.

2-8°C

SMILES string

[H]N[C@H]1CSSC[C@H](NC(=O)[C@H](CC(N)=O)NC(=O)[C@H](CCC(N)=O)NC(=O)[C@@H](NC(=O)[C@H](Cc2ccc(O)cc2)NC1=O)[C@@H](C)CC)C(=O)N3CCC[C@H]3C(=O)N[C@@H](CC(C)C)C(=O)NCC(N)=O

InChI

1S/C43H66N12O12S2/c1-5-22(4)35-42(66)49-26(12-13-32(45)57)38(62)51-29(17-33(46)58)39(63)53-30(20-69-68-19-25(44)36(60)50-28(40(64)54-35)16-23-8-10-24(56)11-9-23)43(67)55-14-6-7-31(55)41(65)52-27(15-21(2)3)37(61)48-18-34(47)59/h8-11,21-22,25-31,35,56H,5-7,12-20,44H2,1-4H3,(H2,45,57)(H2,46,58)(H2,47,59)(H,48,61)(H,49,66)(H,50,60)(H,51,62)(H,52,65)(H,53,63)(H,54,64)/t22-,25-,26-,27-,28-,29-,30-,31-,35-/m0/s1

InChI key

XNOPRXBHLZRZKH-DSZYJQQASA-N

Gene Information

human ... OXT(5020) , OXTR(5021)
rat ... Oxtr(25342)

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Amino Acid Sequence

Cys-Tyr-Ile-Gln-Asn-Cys-Pro-Leu-Gly-NH2 [Disulfide Bridge: 1-6]

General description

Oxytocin (OXT) is a potent natriuretic hormone encoded by the gene mapped to human chromosome 20p13.[1][2] It is synthesized along with its carrier protein neurophysin I from its inactive precursor prepro-OXT. OXT gene consists of three exons and two introns where first exon codes for hormone OXT while other exon codes for neurophysin I.[1]

Application

Oxytocin has been used in immunocytochemistry analysis and it has also been used to study the mechanism responsible for the reduced ability of mice deficient in plasminogen (Plg) to support a litter during lactation.[3]

Biochem/physiol Actions

Oxytocin (OXT) and arginine vasopressin hormone plays a vital role in regulation of water excretion, parturition and lactation.[1] OXT has been implicated in hydromineral homeostasis and vascular and cardiac relaxation.[2] Oxytocin might function as an effective therapeutic for psychiatric diseases, including depression, schizophrenia, anxiety disorders and autism. OXT has a potential as a marker of autism severity.[4] OXT is an anorexigenic neuropeptide, which is implicated in social cognition and obsessive-compulsive behavior. Plasma oxytocin levels are high in children with Prader-willi syndrome (PWS) compared with unrelated and unaffected siblings.[5] Deficiency of OXT hormone might contribute to pathogenesis of attention deficit/hyperactivity disorder (ADHD).[6]
Stimulates uterine contraction and lactation; increases Na+ excretion; stimulates myometrial GTPase and phospholipase C.

Physical form

Lyophilized powder containing 3% oxytocin with mannitol and buffer salts.

Storage Class Code

11 - Combustible Solids

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

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Certificates of Analysis (COA)

Lot/Batch Number
0000272429
0000257584
0000257585
0000272430
0000272430

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Mia E Persson et al.
Hormones and behavior, 95, 85-93 (2017-08-03)
The oxytocin system may play an important role in dog domestication from the wolf. Dogs have evolved unique human analogue social skills enabling them to communicate and cooperate efficiently with people. Genomic differences in the region surrounding the oxytocin receptor
Margaret M Njoroge et al.
The American journal of tropical medicine and hygiene (2020-12-31)
Intranasal instillation of SE36, a malaria vaccine candidate antigen, in lactating BALB/c female mice resulted in the appearance of the antigen in breast milk as demonstrated by sandwich ELISA and Western blot. Pups born of immunologically naive mice and breastfed
Mary C Peavey et al.
Proceedings of the National Academy of Sciences of the United States of America, 118(11) (2021-03-13)
Uterine contractile dysfunction leads to pregnancy complications such as preterm birth and labor dystocia. In humans, it is hypothesized that progesterone receptor isoform PGR-B promotes a relaxed state of the myometrium, and PGR-A facilitates uterine contraction. This hypothesis was tested
Lack of plasminogen leads to milk stasis and premature mammary gland involution during lactation
Green KA
Developmental Biology, 299(1), 164-175 (2006)
Mikko J Peltola et al.
Emotion (Washington, D.C.), 14(3), 469-477 (2014-04-23)
Recent studies suggest that parental caregiving is associated with adaptive changes in neurocognitive responses to emotional cues and oxytocin function, possibly reflecting the increased need of parents to monitor infants' emotional states. In the current study, we investigated whether the
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Questions

  1. I was wondering how many times Oxytocin lyophilized powder can be stored once it is diluted.

    1 answer

    1. The stability of Oxytocin concentrates stored at various temperatures for 48 months was evaluated regularly for biological activity on rat uteri. It was found that concentrates kept in a refrigerator showed no loss of oxytocin activity, while samples kept at 21°C showed a slight loss of activity (about 1.5% per year), and those at 30°C showed a marked loss of activity (about 10% per year). Similar results were obtained with dilute injections of oxytocin. The study concluded that oxytocin in solution has a shelf life of 3 years at 21°C but should not be exposed to higher temperatures (Nachtmann et al. 1981).

      In a simulation study conducted by WHO in collaboration with IDA Foundation, two batches of three brands of oxytocin ampoules were stored at different temperatures and samples were assayed for oxytocin content over a period of 2 years (Hogerzeil et al. 1993). Based on the results (Figure 2), WHO and IDA suggested the following guidelines for the shelf life of oxytocin injections at higher temperatures:

      - At 2°C- 8°C, shelf life of 3 years.
      - Below 21°C, shelf life of 2 years.
      - At 25°C, the shelf life is reduced to 1 year.
      - At 30°C, the shelf life is reduced to 6 months.
      - At 40°C transport maximum 1 week.

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