Qin jiao

Qin Jiao (Radix Gentianae Macrophyllae): A Comprehensive Reference

1. Identity and Nomenclature

1.1 Names and Classification

Qin Jiao (秦艽, Pinyin: Qín Jiāo) is the Chinese pharmaceutical name for the dried roots of several perennial herbs belonging to the genus Gentiana, family Gentianaceae. Radix Gentianae Macrophyllae, commonly known as Qinjiao (秦艽 in Chinese), is the dried roots of medicinal plants that belong to the Gentianaceae family and the Gentiana genus. It is also referred to in English as Large-Leaf Gentian Root, Largeleaf Gentian, or simply Gentiana Root.

1.2 Botanical Sources

The Chinese Pharmacopoeia (2020 edition) officially identifies four botanical sources for genuine Qin Jiao: Gentiana macrophylla Pall., Gentiana straminea Maxim., Gentiana crassicaulis Duthie ex Burk., and Gentiana dahurica Fisch., underscoring its diverse origins. The former three are usually called Qin Jiao and Ma Hua Jiao according to different morphological characters, while the last one is often termed Xiao Qin Jiao. Gentiana macrophylla Pall. is considered the primary and most historically authoritative source. Since the Tang Dynasty, G. macrophylla Pall. has been recognized as the primary source of Qin Jiao and remains in use today.

Qin Jiao is characterized by stout, yellowish-brown rhizomes; the primary root can reach lengths of up to 30 cm and is characterized by longitudinal wrinkles on its surface. The erect stem typically measures between 30 and 60 cm in height and is encircled at the base by residual fibrous sheaths. The plant is widely distributed in western and northern China, Mongolia, and Russia.

1.3 Geographical Distribution and Conservation Status

The genus Gentiana comprises approximately 400 species, widely distributed in the temperate regions of the Northern Hemisphere and the alpine regions of the tropics. In China, there are about 247 species, found throughout the country, with most species concentrated in the mountainous areas of the southwest, primarily growing in alpine talus slopes, alpine meadows, and shrublands. Owing to its high medicinal value, uncontrolled exploitation has led to wild resources becoming extremely scarce, and the plant is listed by the Chinese government as a third-class protected wild herb.

1.4 Medicinal Part and Common Preparations

The medicinal part of the plant is its dried root. Native to China, the roots are harvested in the autumn, cleaned, and then dried before being used as medicine. More specifically, in spring and autumn, people gather the roots, remove impurities, dry them to semi-dry, stack them until they show a reddish-yellow or yellow color, spread them out, dry them in the sun, and cut them into pieces to make Chinese herbal medicines. The herb can be made into decoctions, pills, powders, or ground for external use. Unlike the intensely bitter Gentiana lutea, G. macrophylla has a gentler taste and is typically used in decoctions, capsules, or patent formulas.

2. Traditional and Historical Use

2.1 Documentation in Classical Chinese Medical Texts

Qin Jiao is a key medicinal herb in Traditional Chinese Medicine (TCM), celebrated for its ability to eliminate wind-dampness, open meridians, reduce deficiency heat, and alleviate damp-heat ailments. Its use dates back to the Shennong Bencao Jing (Divine Farmer's Materia Medica, 1st–2nd century AD), where it was classified as a 'middle-grade' herb known for treating 'pathogenic cold-heat factors, wind-damp joint pain, and arthralgia.'

Qinjiao has been described and recorded in several Chinese Medicine monographs including the Shen Nong Ben Cao Jing (Han Dynasty), Tu Jing Ben Cao (Song Dynasty), Zhi Wu Ming Shi Tu Kao (Qing Dynasty), and especially the Ben Cao Gang Mu (Compendium of Materia Medica, Ming Dynasty), which described Qinjiao as a middle-grade medicine.

Li Shizhen's Bencao Gangmu, written during the Ming Dynasty, specifically highlights Qin Jiao's effectiveness in relieving joint obstructions, reinforcing its traditional use in treating joint pain syndromes. Clinical use of Qin Jiao for liver disease has a long history, being recorded to be used alone to treat jaundice in the Compendium of Materia Medica.

Qin Jiao was first documented in the Shennong Bencao Jing and described as "an herb with cool nature, and bitter taste, which used to release either acute or chronic pain, arthritis in cold or hot wind-damp conditions, reverse Yin deficiency."

2.2 TCM Properties and Theory

In TCM theory, Qin Jiao is bitter, acrid, and slightly cold in nature, entering the Stomach, Liver, and Gallbladder meridians. It is traditionally used to dispel wind-dampness, relax sinews, and relieve pain, particularly in cases where hot-type arthritis or painful obstruction (Bi syndrome) is present.

One of Qin Jiao's distinguishing characteristics within its pharmacological category is its moistening nature. Qin Jiao is a gentle, moistening herb prized for relieving joint pain, stiffness, and muscle cramping caused by wind and dampness. Unlike most herbs in its category, it is not drying, making it suitable for people with both hot and cold types of joint problems.

2.3 Traditional Indications

The principal traditional indications recorded across classical sources include:

• Dispelling wind and dampness and opening the channels and collaterals to treat bi zheng (painful obstruction syndrome). It is most effective at treating musculoskeletal and joint pain and stiffness with heat signs (redness, swelling, inflammation) as well as joint pain associated with changes in the weather.
• Clearing deficiency heat characterized by steaming bones and tidal fever, as well as other deficiency heat signs.
• In combination with other herbs, treating jaundice—an effect considered mild and suitable for acute jaundice in a pediatric context.
• Counteracting the drying action of other herbs that dispel wind-dampness; moistening the intestines for dry constipation.
• Treating rheumatism, arthralgia, stroke, hemiplegia, pains, jaundice, and infantile malnutrition.

2.4 Multi-Ethnic Traditional Use

Qin Jiao is also a common Tibetan medicinal herb used for the treatment of tonsillitis, urticaria, and rheumatoid arthritis, while the flowers have been used as a Mongolian herb for curing cough and sore throat and eliminating phlegm due to its anti-inflammatory effects.

2.5 Classical Formula Contexts

In TCM systems, the clinical application of Qin Jiao exhibits three distinct characteristics: diversity in formula combinations, specificity in processing methods, and clarity in clinical symptom indications. Classical prescriptions using Qin Jiao as the monarch (chief) drug primarily include Da Qinjiao Decoction (DQJD), Qinjiao Biejia Powder (QBP), Qinjiao Cangzhu Decoction (QCD), and Duhuo Jisheng Decoction (DJD). It is often combined with herbs like fang feng (siler), dang gui (angelica), and bai shao (white peony) in traditional formulas designed to relieve wind-dampness and nourish the blood.

3. Phytochemistry: Key Constituents and Active Compounds

3.1 Overview of Chemical Diversity

A total of 248 compounds have been reported and systematically reviewed from Gentianae Macrophyllae Radix. It is reported in the literature that Qin Jiao mainly contains iridoids and secoiridoids, in addition to triterpenoids, flavonoids, lignans, steroids, alkaloids, and other chemical components. Among them, iridoids and secoiridoids are the main active ingredients.

3.2 Iridoids and Secoiridoid Glycosides

Among iridoids, gentiopicroside, swertiamarin, and sweroside are not only the most abundant phytochemicals in Gentianae Macrophyllae Radix but also serve as key bioactive components responsible for their pharmacological activities. Iridoids, such as gentiopicroside, are the characteristic components of Qin Jiao.

Gentiopicroside is quantitatively the dominant bioactive constituent. The major biological component, gentiopicroside, accounts for approximately 8% of the content in the dry roots. Gentiopicroside and stelepicroside contained in Qin Jiao are the main components that exert anti-inflammatory activity.

Swertiamarin is another significant secoiridoid. A study reported that swertiamarin regulates the expression of RANKL/RANK/OPG to control the release of pro-inflammatory and pro-angiogenic markers.

Sweroside has been identified as exhibiting hepatoprotective, antidiabetic, and anti-inflammatory effects. Sweroside, isolated and identified from many plants that belong to the Gentianaceae family and Gentiana genus, is a typical iridoid that exhibits biological activities such as hepatoprotective, antidiabetic, and anti-inflammatory effects.

Secoiridoids are a group of characteristic compounds that widely distribute in Gentiana herbs and have been used in the treatment of arthralgia, stroke, and osteoarthritis. Gentiopicroside-type secoiridoids, especially gentiopicroside, have been proved to display a wide range of bioactivities including inhibition of phospholipase A2.

3.3 Cycloeneether Terpenoids

Recent pharmacological studies have identified cycloeneether terpenoids, particularly gentianosin, as key bioactive constituents of Qin Jiao, significantly contributing to its therapeutic efficacy.

3.4 Flavonoids and Triterpenes

Flavonoids, secoiridoid glycosides, and triterpenes have been determined in the extracts and may be the basis of the observed pharmacological effects. Iridoids and triterpenes are probably the predominant bioactive ingredients responsible for the observable effects of Qinjiao.

The diverse pharmacological effects of Gentianae Macrophyllae Radix are associated with its complex chemical structure, particularly with compounds such as gentiopicroside, swertiamarin, amarogentin, linarin, oleanolic acid, gentianine, and polysaccharides.

3.5 Alkaloids

The herb's main active alkaloid, gentianine (秦艽碱甲), has a dose-dependent effect on the central nervous system: small doses are sedating, while large doses can be stimulating.

3.6 Novel Compounds

Continued phytochemical investigation has yielded newly discovered structures. Gentimilegenins A and B, together with several other newly described compounds, have been isolated from the roots of Gentiana macrophylla Pall., and their anti-inflammatory effects were evaluated through detection of inhibitory effects on nitric oxide production in LPS-induced RAW264.7 macrophage cells. Two new secoiridoid-like structures, gentiagenin A and B, were identified and found to exhibit stronger inhibitory effects on nitric oxide production in RAW264.7 macrophage cells than gentiopicroside itself.

3.7 Quality Control Standards

As a traditional Chinese medicinal material, Qin Jiao faces significant challenges in quality control due to frequent adulteration and substitution. To ensure its quality, the Chinese Pharmacopoeia recommends that, in addition to the HPLC method, morphological, microscopic, and thin-layer chromatography identification techniques should also be performed. The total content of gentiopicroside and loganic acid in qualified Gentiana macrophylla samples should be greater than 2.5%.

4. Mechanisms of Action

4.1 Anti-Inflammatory Mechanisms

For centuries, Qin Jiao has been used in traditional medicine to alleviate rheumatoid arthritis (RA), tonsillitis, osteoarthritis (OA), and inflammatory dermatological conditions, with its therapeutic efficacy predominantly attributed to its iridoid glycoside constituents—namely gentiopicroside, swertiamarin, sweroside, and loganic acid. Mechanistic studies reveal that gentiopicroside exerts anti-inflammatory and analgesic effects by disrupting the Reactive Oxygen Species–NF-κB–NLRP3 signaling axis.

Gentiopicroside is an iridoid glucoside derived from Gentiana macrophylla Pall., which is used in TCM to treat RA. Research has been designed to explore the ability of gentiopicroside to combat RA and to explore the molecular basis for such anti-RA activity both in vitro using TNF-α-stimulated human RA fibroblast-like synoviocytes (RA-FLS) and in vivo using a rat adjuvant-induced arthritis (AIA) model.

Nuclear translocation of p65 and p50, and NF-κB transcriptional activity induced by LPS, were suppressed by Gentiana macrophylla Pall. and Gentiana straminea Maxim. These results clearly demonstrated that the chemical composition and pharmacological activities of the two herb species were similar, supporting interchangeability among the two herbs when using them in folk medicine.

Gentiopicroside works by suppressing the ROS-NF-κB-NLRP3 inflammasome pathway, reducing key inflammatory markers including TNF-alpha, IL-1beta, and IL-6.

4.2 Anti-Arthritic Mechanisms

Gentiopicroside has been tested in both a rat adjuvant-induced arthritis model and human rheumatoid arthritis synovial cells, where it significantly reduced joint swelling, arthritis scores, inflammatory cell infiltration, and bone erosion.

Gentiopicroside is believed to possess anti-RA effects, such as inhibiting inflammatory responses and suppressing osteoclastogenesis.

4.3 Anti-Xanthine Oxidase Activity (Gout Pathway)

Qin Jiao and its main active ingredients, iridoid glycosides and gentiopicroside, have shown positive effects in the prevention and/or treatment of gout and joint inflammation through various therapeutic mechanisms, including anti-inflammatory and anti-xanthine oxidase effects. Inhibition of xanthine oxidase reduces the enzymatic conversion of purines to uric acid, which is the central pathway in gout pathophysiology.

4.4 Hepatoprotective Mechanisms

Gentiopicroside, the primary bitter secoiridoid from G. macrophylla roots, has been tested against chemical and immune-mediated mouse models of liver injury. It significantly reduced elevated liver enzymes (GOT, GPT) and suppressed serum TNF levels, suggesting a hepatoprotective mechanism via anti-inflammatory pathways.

Gentiana root inhibits lymphocyte infiltration by downregulating COX-2, IL-1β, and nitric oxide synthase protein expression, while also lowering serum aspartate transaminase (AST) and alanine transaminase (ALT) levels.

4.5 Gastroprotective Mechanisms

Gentiopicroside from G. macrophylla has demonstrated significant protective effects against alcohol-induced stomach ulcers in mice. The mechanism involved both antioxidant and anti-inflammatory pathways, including increased superoxide dismutase (SOD) activity, elevated heat shock protein-70 levels, and decreased TNF-alpha and IL-6 levels in gastric tissue.

5. Scientific Evidence by Area of Use

5.1 Inflammatory Arthritis (Rheumatoid Arthritis and Osteoarthritis)

Preclinical evidence (animal and cell models): This is the most extensively investigated area. Root extracts of G. macrophylla at a dose of 100 mg/kg exhibited a decrease in sole thickness and feet circumferences against rheumatoid arthritis in animal models.

Iridoid glycosides extracted from Gentiana macrophylla flowers—containing gentiopicroside, sweroside, swertiamarin, and loganic acid—were tested in a collagen-induced arthritis rat model. The extract significantly reduced paw edema, arthritis scores, and spleen/thymus indices, and inhibited pro-inflammatory cytokines TNF-alpha, IL-1beta, and IL-6, as well as iNOS and COX-2 expression.

In one study, targets and signaling pathways of gentiopicroside in RA were analyzed using network pharmacology and validated through molecular docking and experimental approaches. A collagen-induced arthritis (CIA) rat model was employed to analyze the role of gentiopicroside in influencing RA joint pathology and related angiogenic factors.

Clinical evidence: Clinical studies have shown significant relief of gouty arthritis symptoms in patients after taking preparations containing Qin Jiao. A systematic review of randomized clinical trials found that some Chinese herbal medicines, such as Tongfengting capsule containing Qin Jiao, can improve functional recovery for gouty patients, with good safety properties.

There are studies showing that Qin Jiao can inhibit other types of arthritis, including rheumatoid arthritis, osteoarthritis, collagen-induced rheumatoid arthritis, osteoporosis, and adjuvant arthritis.

Evidence strength: The preclinical evidence base is substantial, encompassing multiple in vitro cell culture studies and animal model experiments, with well-characterized mechanistic data. Clinical human trial data for Qin Jiao as an isolated herb are limited; most clinical evidence comes from multi-herb formulations in which Qin Jiao is one component. The evidence from experimental data and clinical trials about its effects on gout and joint inflammation are rarely documented in the primary literature, underscoring the need for larger, well-controlled human trials.

5.2 Neurological Applications: Stroke and Hemiplegia

Ischemic stroke is a highly debilitating neurological condition with limited treatment options. The traditional Chinese medicine formula Da Qinjiao Decoction (DQJD) has been widely used for its neuroprotective effects. DQJD comprises 16 herbal components in specific proportions, with Gentiana macrophylla Pall. at 4.5 g alongside several other herbs.

The neuroprotective effects of DQJD were evaluated in a mouse model of middle cerebral artery occlusion/reperfusion (MCAO/R). Neurological recovery was assessed using behavioral tests and tissue analysis, including TTC staining, MRI, and HE & Nissl staining. Mitochondrial function was examined through Western blot, JC-1 assay, ROS staining, and electron microscopy.

Evidence strength: Evidence for Qin Jiao specifically in stroke is largely preclinical or embedded in multi-herb formula research. The herb has historically been used for post-stroke hemiplegia and facial paralysis as recorded in traditional texts, and the formula Da Qinjiao Decoction has been the subject of recent experimental studies, but robust, adequately powered human clinical trials isolating the contribution of Qin Jiao remain absent in the current published literature.

5.3 Hepatoprotection and Jaundice

Qin Jiao has been recorded alone to treat jaundice in the Compendium of Materia Medica and has been frequently prescribed for treatment of liver disease in China.

In a preclinical study, Qin Jiao at doses of 1 and 2 g/kg, or silybin at 40 mg/kg (positive control), was orally given to rats for 7 days to verify the protective effect on acute liver damage induced by carbon tetrachloride (CCl₄). Qin Jiao treatment significantly reduced serum activity levels of AST or ALT by 20–60%.

Evidence strength: Hepatoprotective activity is supported by animal model data and in vitro cell-based studies. Human clinical data specifically evaluating Qin Jiao's liver-protective properties are not currently available in the reviewed literature. The preclinical evidence is mechanistically plausible, but clinical translation has not yet been established.

5.4 Gout and Hyperuricemia

Qin Jiao and its main active ingredients, iridoid glycosides and gentiopicroside, showed positive effects in the prevention and/or treatment of gout and joint inflammation through anti-inflammatory and anti-xanthine oxidase effects.

In at least one animal study, male Sprague-Dawley rats were divided into normal, model, colchicine, Qin Jiao low-dose (QJL), and Qin Jiao high-dose (QJH) groups, administered by oral gavage for 40 days.

Evidence strength: Evidence for gout is primarily from preclinical models and network pharmacology analyses, supported by limited clinical data from multi-herb preparations. Dedicated human trials examining Qin Jiao in gout are sparse.

5.5 Other Pharmacological Activities Identified in Preclinical Research

Current studies using cutting-edge biotechnological methods have revealed diverse pharmacological effects of Qin Jiao, which encompass hepatoprotective, anti-inflammatory, antioxidant, analgesic, antitumor, cholagogic, antibacterial, and osteogenic properties, all regulated through complex intracellular signaling pathways.

Modern pharmacological studies of the extracts have demonstrated inhibitory effects on rat models of rheumatoid arthritis, anti-inflammatory and analgesic effects, as well as alleviating systemic lupus erythematosus, osteoporosis, and liver injury.

Some studies have indicated that Qin Jiao can increase cardiac insulin-like growth factor (IGF)-1 survival signaling and anti-apoptotic proteins in left ventricular (LV) tissues.

All of these activities require emphasis that they are based on cell-line and animal research. No high-quality human clinical trials specifically evaluating these additional pharmacological areas have been identified in the reviewed literature.

6. Body Systems and Health Areas

• Musculoskeletal system: Qin Jiao is used for the treatment of rheumatism, osteoarthritis, inflammation, or ulceration. It is also used to treat Bi syndrome, commonly referred to as rheumatic arthritis, rheumatoid arthritis, muscular spasms, joint pain, stroke, hemiplegia, facial distortion, numbness of limbs, proliferative arthritis, and spinal osteoarthritis.
• Hepatobiliary system: Qin Jiao has been an important herbal medicine since ancient times in China and was frequently prescribed for treatment of rheumatism, arthralgia, and jaundice.
• Nervous system: The traditional Chinese medicine formula Da Qinjiao Decoction has been widely used for its neuroprotective effects in ischemic stroke.
• Metabolic/uric acid regulation: The herb has been investigated for hyperuricemia and gout via xanthine oxidase inhibition, as described in Section 5.4.
• Immune system: Modern chemical and pharmacological studies have found that Qin Jiao has anti-inflammatory and analgesic, hepatoprotective, antiviral, and immunosuppressive effects.
• Thermoregulation (TCM): Qin Jiao was also used to reduce tidal fevers and steaming bone disorder, both terms used in TCM to describe low-grade fevers and night sweats often associated with deficiency conditions.
• Gastrointestinal system: Gentiopicroside from G. macrophylla has demonstrated significant protective effects against alcohol-induced stomach ulcers in mice, involving antioxidant and anti-inflammatory pathways.

7. Dosage Forms and Reported Dosages

7.1 Traditional Oral Dosage Forms

Qin Jiao can be made into decoctions, pills, powders, or ground for external use. As a powder, a dose of 1–3 grams has been noted; the powder can be mixed with water, a suitable decoction, wine, or alcohol for topical application.

7.2 Dosages Used in Preclinical Studies

The dosages employed in animal studies give an indication of the range investigated experimentally, though these cannot be directly extrapolated to human clinical use:

• In a hepatoprotection study, Qin Jiao was orally administered to rats at 1 or 2 g/kg per day for 7 days.
• Root extracts of G. macrophylla at a dose of 100 mg/kg were tested in a rheumatoid arthritis rat model.
• In a gout model, rats received Qin Jiao by oral gavage for 40 days in low-dose and high-dose groups.
• Pharmacokinetic studies have administered total iridoid glucosides at 520 mg/kg (equivalent to 240 mg/kg of gentiopicroside) by oral administration in rodent models.

7.3 Formula Dosage Context

In the Da Qinjiao Decoction formula used in one neuroprotective study, Gentiana macrophylla Pall. was included at 4.5 g alongside 15 other herbal components.

No standardized, globally recognized human clinical dosage has been established for Qin Jiao as an isolated herbal supplement by bodies such as the WHO, European Medicines Agency, or the NIH. Dosage data available are from traditional practice guidelines and preclinical investigations as noted above.

8. Safety Considerations and Interactions

8.1 Traditional Safety Classification

Qin Jiao is classified as non-toxic (无毒) in classical literature, as noted in the Ming Yi Bie Lu.

8.2 Reported Adverse Effects

At standard doses it is generally well tolerated. Occasional adverse effects reported include mild nausea, vomiting, or heart palpitations and slowed heart rate. Rare cases of proteinuria or hematuria have been noted with injectable preparations.

The herb contains gentiopicroside, which is intensely bitter and can irritate the stomach if taken on an empty stomach in sensitive individuals.

8.3 Central Nervous System Dose Dependence

The herb's main active alkaloid, gentianine, has a dose-dependent effect on the central nervous system: small doses are sedating, while large doses can be stimulating. This bidirectional CNS effect has implications for use at high doses.

8.4 Contraindications from Traditional Sources

Chronic debility with loose stools or diarrhea is noted as a situation where Qin Jiao should not be used or requires extra caution. Frail patients are advised not to take it.

8.5 Quality Control and Adulteration Concerns

As a traditional Chinese medicinal material, Qin Jiao faces significant challenges in quality control due to frequent adulteration and substitution. Many inferior medical materials circulate in the market to replace the genuine product. Practitioners are advised to always verify identity using TLC or HPLC against a gentiopicroside reference standard.

8.6 Conservation and Supply Considerations

Owing to its high medicinal value, uncontrolled exploitation has led to wild resources becoming extremely scarce, and Gentiana macrophylla is listed by the Chinese government as a third-class protected wild herb. The increasing demand for this material has led to the widespread cultivation of the plant. Research indicates chemical differences may exist between wild and cultivated specimens, which can affect potency and identity authentication.

8.7 Evidence Gaps Regarding Drug Interactions

Formal pharmacokinetic herb–drug interaction studies for Qin Jiao as a stand-alone preparation are not available in the peer-reviewed literature reviewed here. Most pharmacokinetic studies have been conducted on isolated compounds, especially gentiopicroside, with pharmacokinetic behaviors of this compound in total iridoid glucosides from G. macrophylla investigated by HPLC-UV method. The absence of clinical pharmacokinetic and interaction data means that potential interactions with co-administered medications remain incompletely characterized.

9. Summary of Evidence Strength

Diverse pharmacological effects have been identified for Qin Jiao in laboratory settings, encompassing hepatoprotective, anti-inflammatory, antioxidant, analgesic, antitumor, cholagogic, antibacterial, and osteogenic properties. However, although the identification of compounds from Qinjiao and demonstration of medicinal uses in vitro and in vivo have been carried out, more efforts should be concentrated on the underlying mechanisms of their beneficial bioactivities. Proper toxicity evaluation is indispensable to guarantee safety, efficacy, and eligibility for medical use.

The overall evidence base is characterized by: (1) extensive historical documentation across nearly two millennia of Chinese and Tibetan medical literature; (2) a robust and growing preclinical literature demonstrating anti-inflammatory, hepatoprotective, analgesic, and anti-arthritic activity at the cell and animal level; (3) mechanistic studies identifying NF-κB suppression, NLRP3 inflammasome inhibition, xanthine oxidase inhibition, and COX-2 downregulation as plausible pathways; and (4) limited but emerging human clinical evidence, predominantly from multi-herb formulations rather than isolated Qin Jiao preparations. Adequately powered, placebo-controlled, double-blind clinical trials specifically evaluating Qin Jiao as a monotherapy are lacking, and this represents the principal gap between preclinical promise and established clinical utility.

References

• Gentianae Macrophyllae Radix (Qin-Jiao): A systematic review of ethnopharmacology, phytochemistry, pharmacology, clinical application and quality control – ScienceDirect (2025)
• Botany, traditional use, phytochemistry, pharmacology, quality control, and authentication of Radix Gentianae Macrophyllae – ScienceDirect (2018)
• Anti-inflammatory compounds of "Qin-Jiao", the roots of Gentiana dahurica (Gentianaceae) – ScienceDirect (2013)
• Network pharmacology identification and in vivo validation of key pharmacological pathways of Qin Jiao for gout and arthritis – PMC (2024)
• Investigating the mechanism of Gentiopicroside in rheumatoid arthritis through network pharmacology, molecular docking, and experimental validation – Scientific Reports (2025)
• Anti-Rheumatic Properties of Gentiopicroside Are Associated With Suppression of ROS-NF-κB-NLRP3 Axis – Frontiers in Pharmacology (2020)
• 1H-NMR Based Serum Metabolomics Study to Investigate Hepatoprotective Effect of Qin-Jiao on Carbon Tetrachloride-Induced Acute Hepatotoxicity in Rats – PMC (2017)
• Comparison of the anti-inflammatory and analgesic effects of Gentiana macrophylla Pall. and Gentiana straminea Maxim. – PubMed (2012)
• Seven new chemical constituents from the roots of Gentiana macrophylla Pall – PubMed (2020)
• Medicinal, biological and phytochemical properties of Gentiana species – PMC (2017)
• The chemical structure, pharmacological activity, and clinical progress of Gentianae Radix et Rhizoma – PMC (2025)
• A Comparative Transcriptomic with UPLC-Q-Exactive MS Reveals Differences in Gene Expression and Components of Iridoid Biosynthesis in Various Parts of Gentiana macrophylla – PMC (2022)
• Neuroprotective role of Da Qin Jiu decoction in ischemic stroke: Mitochondrial rescue through PI3K/Akt-mediated UPRmt activation – PubMed (2025)
• Multidimensional comparative analysis of wild and cultivated Gentiana macrophylla – Heliyon (2025)
• Terpenoid Glucosides from Gentiana macrophylla – Semantic Scholar
• Chin-Chiu and Gentiana: Herbs for Deficiency and Excess Liver/Gallbladder Fire – Institute of Traditional Medicine