Storage conditions：Short-term storage at 2~8℃, long-term storage at -20 ~ -80℃
5-Hydroxymethylfurfural (5-Hydroxymethylfurfural, abbreviated as 5-HMF) is an important furan organic compound with the molecular formula C6H6O3 and CAS number 67-47-0. It is found in very low amounts in fresh foods and mainly exists as a product of the pyrolysis of sugars and the Maillard reaction during thermal processing and storage. 5-HMF is widely found in honey, juice, coffee, baked goods, and other sugary foods. Due to its importance in food quality evaluation, food safety, and pharmacological activity research, it has attracted significant attention in recent years. Especially in the field of diabetes and its complications, 5-HMF exhibits complex biological effects involving multiple molecular targets and signaling pathways, offering potential pharmacological regulatory value.
This paper systematically reviews the chemical structure and physicochemical properties of 5-HMF, its natural sources and extraction methods, pharmacological activity and mechanism of action, druggability evaluation, and pharmacokinetic characteristics, with a focus on its target role and clinical application prospects in diabetic complications, aiming to provide theoretical basis and reference for research in the pharmacology of natural products and related fields.
5-Hydroxymethylfurfural is a furan derivative whose molecular structure is based on a furan ring, with positions 2 and 5 replaced by formyl groups (-CHO) and hydroxymethyl groups (-CH2OH), respectively. Its structural formula is 5-(hydroxymethyl)furan-2-formaldehyde, with a molecular weight of 126.1110. The molecule contains an aromatic five-membered furan ring, which has certain polarity and hydrophilicity.
In terms of physicochemical properties, 5-HMF has a LogP value of 0.2252, indicating strong hydrophilicity, and a water solubility of 21.0717 mg/mL, indicating good solubility in water. The topological pole surface area (TPSA) is 50.44 Ų, indicating moderate molecular polarity and favorable binding to biomacromolecules. The blood-brain barrier (BBB) has high permeability, suggesting it may affect the central nervous system. The hERG channel inhibition test was negative, indicating a low risk of cardiotoxicity. The Ames mutagenic test scored 2.1, indicating weak mutagenicity, but its safety should still be carefully evaluated.
The chemical stability of 5-HMF is greatly affected by environmental factors and is prone to further degradation or polymerization under acidic or high-temperature conditions. This is especially important in food processing and pharmaceutical formulation development.
5-HMF is not a typical plant secondary metabolite, but rather a product produced by sugars through the Maillard reaction and dehydration reaction during heat processing, drying, or storage. Therefore, its "source" mainly depends on the processing of sugar-containing plant raw materials. 5-HMF can be detected in honey, juices, cereal products, and dried extracts of certain medicinal plants.
In natural product research, 5-HMF extraction is usually done using water extraction or alcohol extraction combined with liquid chromatography separation techniques. Typical extraction processes include:
In recent years, green and efficient technologies such as ultrasound-assisted extraction and microwave-assisted extraction have also been applied to 5-HMF extraction, improving extraction efficiency and purity.
As a naturally occurring furan compound, 5-HMF exhibits multiple biological activities and plays an important role in the pathological mechanisms of diabetes and its complications. Its pharmacological activities mainly include antioxidant, anti-inflammatory, regulating glucose metabolism, and cell protection.
5-HMF can eliminate free radicals and reduce oxidative stress damage. Multiple in vitro and in vivo studies have shown that 5-HMF enhances intracellular antioxidant enzyme activity and reduces reactive oxygen species (ROS) levels by modulating the Nrf2/ARE signaling pathway. Additionally, 5-HMF inhibits the NF-κB signaling pathway, reducing the expression of pro-inflammatory factors such as TNF-α and IL-6, thereby exerting anti-inflammatory effects.
The high-sugar environment in diabetic patients promotes the formation of AGEs (advanced glycosylation end products). 5-HMF, as one of the Maillard reaction products, serves as both a precursor to AGEs and regulates related signaling pathways. Studies show that 5-HMF can regulate AKR1B1 (aldose reductase) activity, inhibit overactivity of the polyol pathway, and alleviate diabetic retinopathy and neuropathy. At the same time, 5-HMF affects RAGE (AGE receptor) and downstream signaling, reducing inflammatory responses and vascular damage.
5-HMF has protective effects on endothelial and nerve cells, improving cell function and promoting cell survival. It promotes nitric oxide (NO) production by regulating NOS3 (nitric oxide synthase 3) activity, improving vasodilatory function. Additionally, 5-HMF regulates key glucose metabolism enzymes GFPT1 (glutaminofructose-6-phosphate transferase 1), OGT (O-GlcNAc transferase), and UGP2 (urodine diphosphate glucopyrophosphatase 2), affecting glycosylation modifications and regulating cellular metabolic homeostasis.
The biological activity of 5-HMF is closely related to its multi-target effects, especially in the pathological processes of diabetic complications, where its targets include key nodes such as oxidative stress, inflammatory responses, and glucose metabolism.
AKR1B1 is a rate-limiting enzyme in the polyol pathway, catalyzing the reduction of glucose to sorbitol. Overactivity leads to osmotic imbalance and oxidative stress. 5-HMF reduces sorbitol accumulation by inhibiting AKR1B1 activity, alleviating microvascular complications in diabetes.
NFKB1 is a core transcription factor in inflammatory responses, regulating the expression of various pro-inflammatory genes. 5-HMF inhibits NFKB1 activation, reduces the release of inflammatory mediators, and alleviates chronic diabetes-related inflammatory states.
NOS3 regulates vasodilation and blood flow dynamics. 5-HMF promotes NO production by activating NOS3, improves endothelial function, and helps prevent diabetic vascular lesions.
ICAM1 and VCAM1 mediate the adhesion of leukocytes to vascular endothelium, and are key molecules for inflammatory responses and vascular injury. 5-HMF downregulates its expression, reducing infiltration of inflammatory cells and protecting vascular integrity.
RAGE mediates the pathological effects of AGEs, promoting oxidative stress and inflammation. 5-HMF regulates RAGE signaling, inhibits its activation, and simultaneously modulates AGER1 expression, promotes clearance of AGEs, and alleviates diabetic tissue damage.
These enzymes are involved in glycation and energy metabolism regulation. 5-HMF modulates its activity, influences protein O-GlcNAc modification, regulates cellular metabolic balance, and improves metabolic disorders in diabetes.
5-HMF has a low molecular weight (126.11 Da) and moderate polarity (TPSA 50.44 Ų), which facilitates its absorption and distribution in the body. Its LogP value of 0.2252 indicates strong molecular hydrophilicity and good water solubility (21.07 mg/mL), which aids oral absorption.
The high penetration ability of the blood-brain barrier suggests its potential impact on the central nervous system, which has potential implications for the treatment of diabetes-related neuropathy. hERG channel inhibition is negative, indicating a low risk of cardiotoxicity and good safety. An Ames test score of 2.1 suggests weak mutagenicity, but further toxicological studies are needed to confirm safety.
Pharmacokinetics, 5-HMF is mainly metabolized in the body through hepatic enzyme systems, with metabolites including carboxylic acid and sulfate conjugates. Its half-life is moderate, maintaining a certain plasma concentration and supporting clinical feasibility. Due to its widespread presence in food and its long history of human exposure, it provides a foundation for safety evaluation.
As a natural product, 5-HMF shows broad application prospects in the prevention and treatment of diabetes and its complications due to its multi-target and multi-mechanism pharmacological properties. Its antioxidant, anti-inflamed, and metabolic regulatory effects are expected to make it a novel natural drug candidate for adjunctive treatment of diabetic microvascular disease, neuropathy, and cardiovascular complications.
Additionally, 5-HMF serves as a quality indicator and a representative of Maillard reaction products in the food industry, providing important references for food safety evaluation and functional food development. In the future, combining modern medicinal chemistry and pharmacological technologies, structural optimization, formulation development, and combination drug strategies for 5-HMF will become research hotspots.
However, the mutagenicity and potential toxicity of 5-HMF still require thorough evaluation, especially regarding safety under high-dose long-term exposure. Systematic implementation of preclinical and clinical trials is key to advancing its drug formulation process.
5-Hydroxymethylfurfural, as a typical natural product and food processing product, holds significant research value in the field of natural product pharmacology due to its unique chemical structure and diverse biological activities. Its multi-target regulatory role in diabetes and related complications provides a theoretical foundation and practical direction for the development of novel natural drugs.
Future research should focus on in-depth analysis of its mechanism of action, improving safety evaluation, and exploring clinical applications. Through multidisciplinary collaboration, it is expected to promote the transformation of 5-HMF from a food safety indicator into a clinical drug, leveraging its potential advantages in diabetes prevention and treatment to benefit a wide range of patients.
