L-5-Hydroxytryptophan

220.22

220.22

88200

224-411-1

C1LJO185Q9

2811

TSCA listed

DTXSID1025437

C52181

white

N - Nervous system

29339990

99.3

-2.051

white solid

0.902 g/mL at 25 °C (lit.)

270 °C (dec.) (lit.)

361.16°C (rough estimate)

175 °F

n20/D1.4850(lit.)

Slightly soluble

2-8°C

2.55X10-11 mm Hg at 25 deg C (est)

-32.5 º (c=1,H2O on dry basis)

2.22±0.10(Predicted)

Henry's Law constant = 2.1X10-18 atm-cu m/mol at 25 °C (est)

152.2 Ų [M+Na]+ [CCS Type: DT, Method: single field calibrated with Agilent tune mix (Agilent)]|148.86 Ų [M-H]- [CCS Type: DT, Method: single field calibrated with Agilent tune mix (Agilent)]|157.88 Ų [M+H]+ [CCS Type: DT, Method: stepped-field]|156.47 Ų [M+Na]+ [CCS Type: DT, Method: stepped-field]|153.72 Ų [M-H]- [CCS Type: DT, Method: stepped-field]|149.8 Ų [M-2H+Na]-

Hydroxyl radical reaction rate constant = 2.39X10-10 cu cm/molec-sec at 25 °C (est)|Crystals; specific optical rotation: -32.5 deg at 20 °C/D (water); +16.0 deg at 20 °C/D (4 N HCl) /l-form/|Crystals; specific optical rotation: +32.2 deg at 20 °C/D (water) /d-form/

L-5-Hydroxytryptophan is sensitive to air. Slightly water soluble .

Phenols and Cresols

L-5-Hydroxytryptophan reacts with bases. .

2-8°C

III

6.1

UN 2811 6.1/PG 3

3

Xn,Xi

36-26

YN7110000

Xn,Xi

AQ SOLN ARE STABLE @ LOW PH /DL-FORM/

Missing Phrase - N15.00950417-P305 + P351 + P338

22-36/37/38-65-20/21/22-20/21

SRP: At the time of review, criteria for land treatment or burial (sanitary landfill) disposal practices are subject to significant revision. Prior to implementing land disposal of waste residue (including waste sludge), consult with environmental regulatory agencies for guidance on acceptable disposal practices.

UN 2811 6.1/PG 3

Flash point data for L-5-Hydroxytryptophan are not available, however, L-5-Hydroxytryptophan is probably combustible.

|Warning|H226 (50%): Flammable liquid and vapor [Warning Flammable liquids]|P210, P233, P240, P241, P242, P243, P261, P264, P270, P271, P280, P301+P312, P303+P361+P353, P304+P312, P304+P340, P305+P351+P338, P312, P330, P337+P313, P370+P378, P403+P235, and P501|Aggregated GHS information provided by 2 companies from 2 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.|Danger|H301 (97.32%): Toxic if swallowed [Danger Acute toxicity, oral]|P261, P264, P270, P271, P280, P301+P310, P302+P352, P304+P340, P305+P351+P338, P312, P321, P330, P332+P313, P337+P313, P362, P403+P233, P405, and P501|Aggregated GHS information provided by 112 companies from 9 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.

Fires involving this compound can be controlled using dry chemical, carbon dioxide or Halon extinguishers. (NTP, 1992)

Excerpt from ERG Guide 154 [Substances - Toxic and/or Corrosive (Non-Combustible)]: As an immediate precautionary measure, isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters (75 feet) for solids. SPILL: Increase, in the downwind direction, as necessary, the isolation distance shown above. FIRE: If tank, rail car or tank truck is involved in a fire, ISOLATE for 800 meters (1/2 mile) in all directions; also, consider initial evacuation for 800 meters (1/2 mile) in all directions. (ERG, 2016)

SMALL SPILLS AND LEAKAGE: Should a spill occur while you are handling this chemical, you should dampen the solid spill material with alcohol, then transfer the dampened material to a suitable container. Use absorbent paper dampened with alcohol to pick up any remaining material. Seal the absorbent paper, and any of your clothes, which may be contaminated, in a vapor-tight plastic bag for eventual disposal. Solvent wash all contaminated surfaces with alcohol followed by washing with a strong soap and water solution. Do not reenter the contaminate area until the Safety Officer (or other responsible person) has verified that the area has been properly cleaned. STORAGE PRECAUTIONS: You should keep this material in a tightly-closed container under an inert atmosphere, and store it at refrigerated temperatures. (NTP, 1992)

RECOMMENDED RESPIRATOR: Where the neat test chemical is weighed and diluted, wear a NIOSH-approved half face respirator equipped with an organic vapor/acid gas cartridge (specific for organic vapors, HCl, acid gas and SO2) with a dust/mist filter. (NTP, 1992)

Levothym (Promonta Lundbeck, Germany), Lévotonine (Panpharma, France), Oxyfan (Coli, Italy), Tript-OH (Sigma- Tai, Italy).

5-HTP may decrease the effectiveness of methylsergide and cyproheptadine.|DURATION OF /SRP:CNS DEPRESSION/ INDUCED BY ETHANOL (3.0 G/KG, IP) IN MICE OF BOTH SEXES WAS INCR BY PRETREATMENT WITH 5-HYDROXYTRYPTOPHAN (60 MG/KG, IP).|Concurrent use of 5-HTP with a selective serotonin reuptake inhibitors (SSRI) /citalopram, fluvoxamine maleate, fluoxetine, paroxetine, sertraline, venlafaxine/ may potentiate the antidepressant effect of the SSRI and may also increase the risk of adverse reactions.|Phenoxybenzamine inhibits the conversion of 5-HTP to serotonin.|For more Interactions (Complete) data for 5-HYDROXYTRYPTOPHAN (16 total), please visit the HSDB record page.

... Timed-pregnant CD-1 mice were dosed by gavage (po) on gestational days 6-15 with L-5-Hydroxytryptophan (HTP) (0.0, 50.0, 150.0, 300.0 or 450.0 mg/kg/day) in corn oil. ... Dams were weighed on gestational days 0, 6-15 (prior to daily dosing) & 17 (immediately after sacrifice) & were also observed for clinical signs of toxicity. At sacrifice on gestational day 17, dams were evaluated for body weight, liver weight, gravid uterine weight & status of uterine implantation sites (i.e., sites, resorptions, dead fetuses, live fetuses). Live fetuses were dissected from the uterus & evaluated for live litter size, body weight, sex & gross morphological abnormalities. All live fetuses were examined for visceral malformations employing the Staples' fresh tissue dissection method. Half of the fetuses were decapitated prior to dissection & the heads were fixed in Bouin's solution for free-hand sectioning & exam (Wilson's technique). All fetal carcasses were stained with Alizarin Red S & examined for skeletal malformations. The maternal mortality rate in the present study was 0.0% for all dose groups. A significant dose-response trend (p<0.05) for reduction in maternal body weight was observed on gestational days 11, 15 & 17, but not on gestational days O or 6 (immediately prior to onset of dosing), with no significant pairwise comparisons. There was also a downward significant trend for maternal weight gain during gestation period & during treatment period but no significant pairwise comparisons. At sacrifice on gestational day 17 a dose-response trend was evident for reduction in maternal liver weight, with the values from L-5-Hydroxytryptophan-150 & L-5-Hydroxytryptophan-450 dams significantly reduced relative to controls. Relative maternal liver weight & absolute & relative kidney weight values did not vary among dose groups. The following clinical signs: maternal weight loss of 1 gram or more/day (considered to be an indication of toxicity in individual dams), alopecia, piloerection, rough coat, unthriftiness, diarrhea & hyperactivity were all exhibited by dams in a clear dose-dependent manner. Data concerning the status of uterine implantation sites exhibited a variable response. There were no statistically significant dose- related differences for number of implantation sites/dam, number or % of resorptions, fetal deaths, nonlive fetuses (dead plus resorbed) or affected fetuses (non-live plus malformed)/litter, or for the number or proportion of litters with one or more resorptions, fetal deaths, non-live, or affected fetuses. In live litters (i.e. litters with one or more live fetuses) there was no difference in the number of live fetuses/litter or in the proportion of males to females/litter across treatment groups. Body weights of live fetuses in toto, or for male & female fetuses separately, from L-5-Hydroxytryptophan-treated litters exhibited a significant downward dose-response trend, with values from L-5-Hydroxytryptophan-300 & L-5-Hydroxytryptophan-450 dams significantly reduced relative to controls. There were no significant differences among treated & control litters in the number or percentages of males, females or live fetuses malformed nor in the number or percentages of litters with malformed fetuses. Exam of malformation incidence by category produced no evidence of overall dose-response trends, although exencephaly & trilateral open eye were seen in fetuses only from L-5-Hydroxytryptophan-150, L-5-Hydroxytryptophan-300 & L-5-Hydroxytryptophan-450 dose groups. In conclusion, no evidence for teratogenicity of L-5- hydroxytryptophan was seen in pregnant CD-1 mice when administered in corn oil by gavage during the time of organogenesis at doses which produced marginal evidence of maternal toxicity (clinical signs & trends for reduced body weights & weight gain), & evidence of fetal toxicity as indicated by a highly significant dose-response trend toward decreased fetal weight, with significantly lower values in the L-5-Hydroxytryptophan-300 & L-5-Hydroxytryptophan-450 groups relative to controls.

5-HTP should be avoided by pregnant women and nursing mothers.|5-HTP should be avoided by those with ischemic heart disease (history of myocardial infarction, angina pectoris, documented silent ischemia), coronary artery spasm (e.g., Prinzmetal's angina), uncontrollable hypertension and any other significant cardiovascular disease.

For use as an antidepressant, appetite suppressant, and sleep aid.

5-HTP has shown some usefulness in some conditions characterized, in part, by serotonin deficits, principally depression. It has also been shown to be useful in some with obesity, insomnia, fibromyalgia and chronic tension headache.|It has been long known that brain serotonin systems contribute to the modulation of food intake and satiety. An increase of intrasynaptic serotonin tends to reduce food consumption. Thus, one might consider that individuals taking 5-HTP might experience increase satiety and weight loss over a period of time. There are few studies on the effects of 5-HTP on obesity and they suggest an anorectic effect of 5-HTP.|There is some evidence that 5-HTP ... can improve postural equilibrium, dysarthria in patients with various inherited and acquired cerebellar ataxias, and particularly in those with lesions located precisely in the anterior lobe vermis. Improvements in coordination have been reported in patients with Friedreich"s ataxia; however, the effect is only partial and not clinically major.|Exptl Ther: Rats of the Dahl salt-sensitive (DS) and Dahl salt-resistant (DR) strains were placed on a 4% NaCl diet and blood pressures were monitored. Chronic subcutaneous infusion L-5-hydroxytryptophan (L-5-HTP, 12.6 mg/day) by osmotic minipumps significantly decreased the elevated systolic blood pressure of DS rats on a 4% NaCl diet. Blood pressures of DR rats were unaffected by treatment with L-5-HTP. Cardiac hypertrophy was associated with Dahl salt-induced hypertension. However, treatment with L-5-HTP failed to reduce the weight of the heart significantly. These results suggest that chronic administration of L-5-HTP was effective in reducing the elevated blood pressure in the DS model. The specific mechanisms by which L-5-HTP reduces the elevated blood pressure in DS rats is not clear and remains for further study.|For more Therapeutic Uses (Complete) data for 5-HYDROXYTRYPTOPHAN (6 total), please visit the HSDB record page.

Other reported side effects, include nausea, diarrhea, loss of appetite, vomiting and difficult breathing. Neurological side effects, including dilation of the pupils, abnormally sensitive reflexes, loss of muscle coordination and blurring of vision, have been reported in those taking large doses of 5-HTP. Cardiac dysrhythmias have also been reported.|Eosinophilia and eosinophilia-myalgia syndrome (EMS) have been reported in those taking 5-HTP. The eosinophilia myalgia syndrome is similar to that caused by L-tryptophan and was linked to contaminants in the 5-HTP preparation, rather than 5-HTP itself. Changing the 5-HTP lot in one group of patients resolved the eosinophilia. A scleroderma-like skin condition has been reported in some taking a combination of 5-HTP and carbidopa.|5-HTP should be avoided by pregnant women and nursing mothers.|5-HTP should be avoided by those with ischemic heart disease (history of myocardial infarction, angina pectoris, documented silent ischemia), coronary artery spasm (e.g., Prinzmetal's angina), uncontrollable hypertension and any other significant cardiovascular disease.|For more Drug Warnings (Complete) data for 5-HYDROXYTRYPTOPHAN (8 total), please visit the HSDB record page.

The psychoactive action of 5-HTP is thought to be due to increased serotonin production in central nervous system tissue.

A structurally and mechanistically diverse group of drugs that are not tricyclics or monoamine oxidase inhibitors. The most clinically important appear to act selectively on serotonergic systems, especially by inhibiting serotonin reuptake. (See all compounds classified as Antidepressive Agents, Second-Generation.)

The immediate precursor in the serotonin synthetic route, 5-hydroxytryptophan (5-HTP), labeled with 11C in the beta position, has become available for studies using positron emission tomography (PET) to examine serotonin formation in human brain. Normalized uptake and intracerebral utilization of tracer amounts of (beta-11C)5-HTP were studied twice in six healthy male volunteers, three of them before and after pharmacological pretreatments ... Pretreatments with benserazide, p-chlorophenylalanine (PCPA), and unlabeled 5-HTP all significantly increased uptake of (beta-11C)5-HTP. The utilization rates in both striatal and frontal cortex were higher than those in the surrounding brain, indicating that PET studies using (beta-11C)5-HTP as a ligand quantitate selective processes in the utilization of 5-HTP.|The efficiency of absorption of 5HTP, as well as its decarboxylation product serotonin, is approximately 47% to 84%. Absorption of 5-HTP occurs by an active transport process. 5-HTP is transported by the portal circulation to the liver where approximately 25% of an administered dose is metabolized ... . 5-HTP that is not metabolized in the liver is transported by the general circulation to the various tissues of the body, including the brain. 5-HTP readily crosses the blood-brain barrier, and is converted to serotonin in brain cells.

5-Hydroxytryptophan is decarboxylated to serotonin (5-hydroxytryptamine or 5-HT) by the enzyme aromatic-L-amino-acid decarboxylase via a vitamin B6 dependent reaction in nervous tissue and in the liver.|5-HTP is transported by the portal circulation to the liver where approximately 25% of an administered dose is metabolized via vitamin B6-dependent L-aromatic amino acid decarboxylase to 5-hydroxytryptamine (5-HT) /serotonin/. 5-HT is subsequently metabolized to 5-hydroxyindole acetaldehyde which is rapidly metabolized to 5-hydroxyindole acetaldehyde which is rapidly metabolized to 5-hydroxyindoleacetic acid (5-HIAA).

The possible analgesic effect of 5-HTP may be accounted for, in part, by its conversion to serotonin. 5-HTP has also been found to increase plasma beta-endorphin and platelet met-enkephalin levels, which may signify a reinforcing effect upon an endogenous analgesic effect.|The mechanism of the possible antidepressant activity of 5-HTP is accounted for by its conversion to the neurotransmitter serotonin which plays a central role in the affective state. Antidepressants may work by either binding to one or more of the family of serotonin 5-HT receptors (5-HT1 - 5-HT7) or by inhibiting the reuptake of serotonin. ...

Excerpt from ERG Guide 154 [Substances - Toxic and/or Corrosive (Non-Combustible)]: TOXIC; inhalation, ingestion or skin contact with material may cause severe injury or death. Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution. (ERG, 2016)

EYES: First check the victim for contact lenses and remove if present. Flush victim's eyes with water or normal saline solution for 20 to 30 minutes while simultaneously calling a hospital or poison control center. Do not put any ointments, oils, or medication in the victim's eyes without specific instructions from a physician. IMMEDIATELY transport the victim after flushing eyes to a hospital even if no symptoms (such as redness or irritation) develop. SKIN: IMMEDIATELY flood affected skin with water while removing and isolating all contaminated clothing. Gently wash all affected skin areas thoroughly with soap and water. If symptoms such as redness or irritation develop, IMMEDIATELY call a physician and be prepared to transport the victim to a hospital for treatment. INHALATION: IMMEDIATELY leave the contaminated area; take deep breaths of fresh air. If symptoms (such as wheezing, coughing, shortness of breath, or burning in the mouth, throat, or chest) develop, call a physician and be prepared to transport the victim to a hospital. Provide proper respiratory protection to rescuers entering an unknown atmosphere. Whenever possible, Self-Contained Breathing Apparatus (SCBA) should be used; if not available, use a level of protection greater than or equal to that advised under Protective Clothing. INGESTION: DO NOT INDUCE VOMITING. If the victim is conscious and not convulsing, give 1 or 2 glasses of water to dilute the chemical and IMMEDIATELY call a hospital or poison control center. Be prepared to transport the victim to a hospital if advised by a physician. If the victim is convulsing or unconscious, do not give anything by mouth, ensure that the victim's airway is open and lay the victim on his/her side with the head lower than the body. DO NOT INDUCE VOMITING. IMMEDIATELY transport the victim to a hospital. (NTP, 1992)

VET: Treatment consists of early decontamination, control of CNS signs (diazepam, barbiturates), thermoregulation (cool water both, fans), fluid therapy, and administration of a serotonin antagonist such as cyproheptadine ... .

/SIGNS AND SYMPTOMS/ The most common side effects are nausea, vomiting, fatigue/sleepiness. Adverse events appear to be dose related to some degree.|/SIGNS AND SYMPTOMS/ Eosinophilia and eosinophilia-myalgia syndrome (EMS) have been reported in those taking 5-HTP. The eosinophilia myalgia syndrome is similar to that caused by L-tryptophan and was linked to contaminants in the 5-HTP preparation, rather than 5-HTP itself. Changing the 5-HTP lot in one group of patients resolved the eosinophilia. A scleroderma-like skin condition has been reported in some taking a combination of 5-HTP and carbidopa.|/SIGNS AND SYMPTOMS/ Other reported side effects, include nausea, diarrhea, loss of appetite, vomiting and difficult breathing. Neurological side effects, including dilation of the pupils, abnormally sensitive reflexes, loss of muscle coordination and blurring of vision, have been reported in those taking large doses of 5-HTP. Cardiac dysrhythmias have also been reported.|/SIGNS AND SYMPTOMS/ Large doses of 5-HTP may significantly increase serum levels of serotonin, and theoretically, this may result in the serotonin syndrome. Symptoms and signs of the serotonin syndrome, include confusion, agitation, diaphoresis, tachycardia, myoclonus and hyperreflexia. In addition, hypertension, coma/unresponsiveness, seizures, and death may occur if the syndrome is not promptly recognized and treated. There are no reports of serotonin syndrome occurring with use of 5-HTP in humans. However, it could occur and the combination of 5-HTP with another serotonergic agent can increase the risk of it occurring.|/OTHER TOXICITY INFORMATION/ ... Members of a family who became ill after exposure to L-5-HTP were evaluated at the National Institutes of Health. Data from patients with extended exposure to L-5-HTP were also examined. Samples of L-5-HTP were examined using high performance liquid chromatography ... One member of the family had eosinophiliamyalgia syndrome (EMS), and 2 others had eosinophilia. No patient in the other group reviewed developed the syndrome, although 2 patients developed eosinophilia. The L-5-HTP used by the family contained an impurity not present in samples from the other patient group. After replacement with L-5-HTP not containing this impurity, eosinophilia in 2 family members resolved.

5 Hydroxytryptophan

L-Tryptophan, 5-hydroxy-: ACTIVE|PRECURSOR OF SEROTONIN.