Sanjoinine A

Sanjoinine A at a Glance

Sanjoinine A (frangufoline) is a 14-membered cyclopeptide alkaloid from sour jujube seed — a structurally unusual class, being a macrocyclic ring built from amino acids.

Its thin, largely single-laboratory preclinical profile is anchored by a GABAergic sedative effect, which places it alongside jujuboside A and spinosin as one of the three candidate actives behind suan zao ren’s use for insomnia.

What It's Used For

Sanjoinine A — also called frangufoline — is a 14-membered (frangulanine-type) cyclopeptide alkaloid from the seed of sour jujube (Ziziphus jujuba var. spinosa, suan zao ren), the same seed that gives the saponins jujuboside A and jujuboside B. Its profile is thin and single-lab, anchored by a GABAergic sedative signal. The load-bearing discipline: the herb’s insomnia reputation belongs to the whole seed and the Suanzaoren decoction, in which jujuboside A and spinosin are the official quality markers — sanjoinine A is one minor contributor, not the driver — and there are no human trials of the isolate.

Evidence by IndicationStrength of support · Beta

Support is an experimental score — weighted by study type (human > animal > in vitro) and volume. A beta, not a validated metric. No human isolate data, so scores stay low by design.

01Sedative / hypnoticShaky30%Pentobarbital-sleep potentiation via GABA-A ^{1Reference 1Ma Y et al. · 2007Sanjoinine A isolated from Zizyphi Spinosi Semen augments pentobarbital-induced sleeping behaviours through modification of GABAergic systemsView study →}

02AnticonvulsantShaky24%Kainic-acid + NMDA seizure protection ^{2,4Reference 2Yoon SR et al. · 2009Sanjoinine A isolated from Semen Zizyphi Spinosi protects against kainic-acid-induced convulsionsView study →Reference 4Ma Y et al. · 2008Protective effects of sanjoinine A against N-methyl-D-aspartate-induced seizureView study →}

03AnxiolyticShaky18%One elevated-plus-maze study ^{3Reference 3Han H et al. · 2009Anxiolytic-like effects of sanjoinine A isolated from Zizyphi Spinosi Semen: possible involvement of GABAergic transmissionView study →}

Mechanisms

Honesty note: the one NO/iNOS study ^{6Reference 6Um S et al. · 2023Chromatographic determination of the absolute configuration in sanjoinine A that increases nitric-oxide productionView study →} shows sanjoinine A increasing nitric oxide in macrophages (a pro-NO/immunostimulatory, not anti-inflammatory, direction) and is primarily an absolute-configuration methods paper — so no anti-inflammatory claim is made here. The calmodulin-ATPase/PDE inhibition is a whole-genus cyclopeptide-class property, not shown for sanjoinine A specifically ^{7Reference 7Hwang KH et al. · 2001Inhibition of calmodulin-dependent calcium-ATPase and phosphodiesterase by various cyclopeptides and peptide alkaloids from the Zizyphus speciesView study →}.

Pharmacokinetics

There is minimal data, as expected for a cyclopeptide alkaloid. The one direct study is on frangufoline (= sanjoinine A): it is rapidly cleaved enzymatically in rodents at the enamide bond to a linear tripeptide metabolite, likely via a B-esterase-like enzyme (the reaction is inhibited by organophosphates/eserine, not by serum) ^{5Reference 5Suh DY et al. · 1997AnimalMetabolic cleavage of frangufoline in rodents: in-vitro and in-vivo studyView study →}. The implication is probable rapid first-pass/tissue metabolism and low intact-molecule persistence — yet in-vivo activity is still seen after oral dosing in mice (4–8 mg/kg). No formal oral bioavailability, Cmax, half-life or distribution data exist.

Clinical trials

There are no trials of isolated sanjoinine A. Human insomnia evidence belongs to the whole seed (suan zao ren) and the multi-herb Suanzaoren decoction ^{8Reference 8Zhou QH et al. · 2018Suanzaoren formulae for insomnia: updated clinical evidence and possible mechanismsView study →}, not to the isolated compound; the only single-herb Ziziphus trial is a small (n≈12) feasibility study of the seed.

Last checked: July 2026.

Toxicity & Safety

There is no dedicated toxicology on sanjoinine A itself — the reassurance comes from the seed it sits in, not the isolated alkaloid. The one concrete caution is additive sedation, since this is a GABAergic CNS depressant.

Safety at a Glance

✅ Low / no toxicitySedatingSedative interactions

• A food-and-medicine seed constituent. Suan zao ren has a long ingestion history in decoction, and rodent studies at efficacious doses report no acute toxicity signal.
• Avoid the isolate in pregnancy and lactation.
• Additive sedation. Alcohol, benzodiazepines, barbiturates and other CNS depressants compound its GABAergic effect.
• No isolate toxicology exists. No LD50, genotoxicity, repeat-dose or organ-toxicity data.

Full Safety & Interactions Detail

Sanjoinine A carries a low flag, reflecting limited data. It is a constituent of a food-and-medicine seed (suan zao ren) with a long ingestion history in decoction, and rodent efficacy studies at 4–8 mg/kg oral report no acute toxicity signal, with rapid metabolic cleavage arguing against accumulation. However, there is no dedicated isolate toxicology (no LD50, genotoxicity, repeat-dose or organ-toxicity data), and its CNS-depressant/GABAergic activity implies additive sedation risk with alcohol, benzodiazepines, barbiturates and other CNS depressants.

Dosage

There is no established or recommended human dose. Cited figures are preclinical research doses only — sanjoinine A 4–8 mg/kg oral in mice (anticonvulsant), with comparable i.p./oral ranges in the sedative/anxiolytic studies. Human exposure occurs only via the whole seed — traditionally 9–18 g dry-fried suan zao ren in decoction — within which sanjoinine A is one minor cyclopeptide-alkaloid contributor alongside the marker constituents jujuboside A and spinosin.

References

1. Ma Y, et al. (2007). Sanjoinine A isolated from Zizyphi Spinosi Semen augments pentobarbital-induced sleeping behaviours through modification of GABAergic systems. Biological & Pharmaceutical Bulletin. https://pubmed.ncbi.nlm.nih.gov/17827733/
2. Yoon SR, et al. (2009). Sanjoinine A isolated from Semen Zizyphi Spinosi protects against kainic-acid-induced convulsions. Archives of Pharmacal Research. https://pubmed.ncbi.nlm.nih.gov/20091264/
3. Han H, et al. (2009). Anxiolytic-like effects of sanjoinine A isolated from Zizyphi Spinosi Semen: possible involvement of GABAergic transmission. Pharmacology, Biochemistry, and Behavior. https://pubmed.ncbi.nlm.nih.gov/19101585/
4. Ma Y, et al. (2008). Protective effects of sanjoinine A against N-methyl-D-aspartate-induced seizure. Biological & Pharmaceutical Bulletin. https://pubmed.ncbi.nlm.nih.gov/18758071/
5. Suh DY, et al. (1997). Metabolic cleavage of frangufoline in rodents: in-vitro and in-vivo study. Journal of Natural Products. https://pubmed.ncbi.nlm.nih.gov/9090868/
6. Um S, et al. (2023). Chromatographic determination of the absolute configuration in sanjoinine A that increases nitric-oxide production. Biomolecules & Therapeutics. https://pubmed.ncbi.nlm.nih.gov/37019875/
7. Hwang KH, et al. (2001). Inhibition of calmodulin-dependent calcium-ATPase and phosphodiesterase by various cyclopeptides and peptide alkaloids from the Zizyphus species. Archives of Pharmacal Research. https://pubmed.ncbi.nlm.nih.gov/11440077/
8. Zhou QH, et al. (2018). Suanzaoren formulae for insomnia: updated clinical evidence and possible mechanisms. Frontiers in Pharmacology. https://pubmed.ncbi.nlm.nih.gov/29479317/

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