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Publicly Available Published by De Gruyter March 27, 2018

Antimicrobial properties of terrestrial snail and slug mucus

  • Giovanni Cilia and Filippo Fratini EMAIL logo


Snail and slug mucus is a viscous-elastic substance secreted by specific glands with adhesive and lubricants properties that allows them to adhere tenaciously to many different surfaces. It has been used since ancient times for care and human health and it is still very important in traditional and folkloristic medicine. Recently, mucus from snail and slugs and its protein and components have been subjected to some investigations on their antibacterial, antiviral and antifungal activity due to extensive traditional uses and for a future application in medicine. Antimicrobial activities of crude mucus, and its components, against different microorganism have been reported, showing antimicrobial activities that lead their potential employment in several fields as natural additives. The purpose of this Review is to summarize the results of antimicrobial studies of snail and slug mucus and its compounds from the first scientific applications to the isolation of the single components in order to better understand its application and propose an employment in future studies as a natural antimicrobial agent.


Slugs and snails are terrestrial molluscs, belonging to the order Pulmonata, class Gastropoda, phylum Mollusca, characterized by a similar morphology.

The main difference between snails and slugs is the fact that the snails are provided of shells. Snails usually have a spiral-shaped shell which is wound around a spindle. This is the snail shell which they retract their soft bodies into when they detect danger [1].The spiral direction is species-specific.

Slugs are snails-like animals without shell. Not having a shell to protect them, slugs have a very thick slime which makes them disgusting to predators [2].

Both slugs and snails are able to produce a viscous-elastic substance named slime or mucus, with adhesive and lubricant properties that allows them to adhere tenaciously to many different surfaces. The mucus has also other functions: hindering the molluscs dehydration and making slugs and snails unattractive to potential predators [1, 2].

Moreover, snail mucus has the ability to facilitate wound healing and to prevent its infections thanks to its many bioactive compounds [3, 4].

Over the few last years, numerous studies on mucus composition have clarified many aspects of its properties, although much remains to be investigated on its antibacterial activity.

Recently, several researches carried out on snail secretion composition have confirmed that the Helix aspersa mucus contains a great amount of natural substances with beneficial and therapeutic properties for human skin such as allantoin and glycolic acid [5].

This review aims to represent an organic collection of the results obtained from the few studies until today carried out to test the snail mucus antibacterial activity and its main components against various microorganisms.

Historic background

Although the use of many gastropods including snails for food has been demonstrated by numerous archeological discoveries, it is much more difficult to prove their use in therapy and medicine [6]. The brown garden snail, Helix aspersa, has been used in human medicine since ancient times; the earliest application of snail mucus secretions in medicine dates back to the Ancient Greeks. Hippocrates was reported to have used crushed snails to alleviate inflammatory skin conditions. Moreover, the father of Western medicine recommended snail mucus for the treatment of protocoele. Celse claimed that the crude snail with its shell had remarkable healing properties, while after boiling it also acquired emollient capacity. Pliny stated that snail preparations could be employed in every type of wound, such as burns, abscesses and nosebleeds. Galien recommended snails mucus against hydrops foetalis [7].

Dermatological preparation with snail mucus was employed during the eighteenth century to treat dermatological disorders and symptoms associated with tuberculosis and nephritis. In the nineteenth century there was renewed interest in the pharmaceutical and medical use of snails with more and more preparations. This interest in snails continued into the next century with the acquisition of new analytical data on mucus components. Recently, anecdotal reports of generic skin regeneration properties of the mucus from Helix aspersa have been explored; this has resulted in the commercial production of a topical preparation claimed to have “wound healing” as well as anti-ageing properties. These preparations were tested on burn patients and while they noted that a range of pathogenic bacteria were isolated from the wounds before treatment, this was not followed up with culture of post-treatment specimens [8].

Composition of snail mucus

Snail mucus composition varies according to species and according to its role, trail or adhesion function and for these functions, typically, consists of between 90% and 99.7 % water by weight [9]. The remaining part of mucus without water consists of a mixture of proteoglycans, glycosaminoglycans, glycoprotein enzymes, hyaluronic acid, copper peptides, antimicrobial peptides, and metal ions [10, 11, 12, 13]. Atomic absorption spectrometry showed that glue from the slug Arion subfuscus contains substantial quantities of zinc, iron, copper and manganese. Experimentally it was shown that the addition of iron or copper to dissolved slug glue causes the proteins to precipitate rapidly but the addition of zinc had no effect, suggesting that some metal ions play an important role in gel formation [14].

The snail mucus principally contains allantoin, collagen, elastin and glycolic acid.

Allantoin, or 5-Ureidohydantoin, derives from the uric acid transformation by the enzyme uricase. It is known for its desquamating action, its promotion of cell proliferation and wound healing [15, 16, 17].

Glycolic acid, or alfa-Hydroxyacetic acid, has an excellent capability to penetrate skin and is capable to increase collagen synthesis [18, 19, 20].

Another study evidenced that snail mucus can be used, potentially, in regenerating and repairing bone and teeth, because it increased the expression of osteopontin and NF-κB and induced the expression of some inflammatory genes in dental pulp cells [21].

Furthermore, glycoproteins and mucopolysaccharides, physiologically active bio-macromolecular structures are present in snail mucus [9, 22]. Mucin glycoproteins are the major macromolecular constituents of epithelial mucus and have long been implicated in health and disease [12, 23, 24]. The glycoproteins, such as achacin, are, probably, the components involved in antimicrobial activity of snail mucus. Indeed, achacin, other than inhibit bacteria growth, also appeared to attack the bacterial plasma membranes [25]. However, the achacin has the ability to catalyze oxidative deamination producing ketoacids, hydrogen peroxide and ammonia [26]. The antibacterial activity of achacin was found to be dependent on H2O2 production which is produced by the oxidative deamination reaction. These data illustrate that achacin may attack pathogens during other growth phases too by increasing the local concentration of H2O2 so as not to harm neighboring host cells [23, 25, 26].

Scientific evidence provides some credible basis for the possible use of mucus in wound management [27]. The mucus from Cryptomphalus aspersa (also known as Helix aspersa or the common garden snail) contains antioxidant superoxide dismutase (SOD) and Glutathione-S-Transferase activity (GST) activities. Antioxidants are substances that may protect cells from the damage caused by unstable molecules known as free radicals or reactive oxygen species. SODs act as antioxidants and protect cellular components from being oxidized by reactive oxygen species [27]. Furthermore, the Cryptomphalus aspersa mucus stimulated fibroblast proliferation, extracellular matrix assembly and the regulation of metalloproteinase activities and concluded that these effects together provided an array of molecular mechanisms underlying the secretion’s induced cellular regeneration, thereby supporting its possible use in repair of wounded tissues [27]. In a subsequent study it was also demonstrated that the mucus increased migration and increased the expression of cell-cell and cell-substrate adhesion molecules in mammalian fibroblast and keratinocyte cells [28].

It should be noted that some of these properties are analogous to claims made for some modern wound management materials.

Antimicrobial activity

The antibacterial activity of snail mucus was evaluated for the first time with a sample from Achatina fulica Fèrussac, the African giant snail [29]. In this study two different fractions of snail mucus were examined: the water-soluble fraction and the mucin fraction, contained proteins. Both fractions showed a positive antibacterial activity against Gram positive bacteria, such as Bacillus subtilis and Staphylococcus aureus, and Gram negative strains, like Escherichia coli and Pseudomonas aeruginosa. Furthermore, the mucin fraction resulted more effective against bacteria compared to water-soluble fraction [29].

Another antibacterial factor was isolated from the Achatina fulica mucus [30]. This unnamed antibacterial effect showed great inhibition activity against Staphylococcus aureus, followed, with high concentration, by Bacillus subtilis and Pseudomonas aeruginosa and, finally, by Escherichia coli [30].

An N-Acetylneuraminic Acid-Specific Lectin, called Achatinin, isolated from the African giant snail body-surface mucus showed an antibacterial activity against Staphylococcus aureus and Escherichia coli only a concentration of 50 µg/ml [31].

As reported in Table 1, the mucus extracted from various species of land snail exhibited an inhibition action against Gram positive and Gram negative bacteria strains.

Table 1:

Antibacterial activity of snail slime and its antimicrobial compounds.

ComponentSequenceScientific nameVernacular nameDiffusionBacteriaStrainsAssayMICReferences
MucusAchatina fulicaGiant African snail or Giant African land snailEast AfricaSt aureusATCC 9080DDA9.3 mma[33]
(Ferussac, 1821)
St spp15.4±2.04 mm[34]
Strep. epidermidisATCC 1960610.29 mma[33]
Strep spp17.5±2.72 mm[34]
Ps. spp17.1±1.30 mm
E. coliPBR 322DDA21 mm[41]
V. cholerae16 mm
Archachatina marginataGiant West African snail or Banana Rasp snailWestern AfricaE. coliMM0.098 µg/ml[35]
(Swainson, 1821) [normal skinned]Sal. spp0.049 µg/ml
St aureus50 µg/ml
P. spp50 µg/ml
Archachatina marginataGiant West African snail or Banana Rasp snailWestern AfricaE. coliMM0.050 µg/ml[35]
(Swainson, 1821) [albino skinned]Sal. spp0.098 µg/ml
St aureus100 µg/ml
P. spp100 µg/ml
Archachatina marginata var. saturalis (Philippi, 1849)Giant West African snail or Banana Rasp snailWestern AfricaSt sppDDA17.4±1.20 mm[34]
Ps. spp19.2±1.10 mm
Strep. spp18.6±2.14 mm
Archachatina marginata var. ovum (Pfeiffer, 1858)Giant West African snail or Banana Rasp snailSouth AfricaSt sppDDA15.6±1.44 mm[34]
Ps. spp19.8±0.88 mm
Strep. spp19.3±1.90 mm
Helix aspersaGarden snailWorldwideSt aureusNCTC 10788MM0 mmb[36]
(Müller, 1774)
ATCC 25923>50 µg/µl[32]
MucusHelix aspersa (Müller, 1774)Strep. pyogenesNCIMB 13285MM5.5 mmb[36]
E. coliNCTC 103850 mmb
E. coliATCC 2592225 µg/µl[32]
K. pneumoniaeNCTC 112280 mmb[36]
Sal. abony0 mmb
Prot. mirabilis0 mmb
Ac. spp0 mmb
Serr. marcescens0 mmb
Ps. aeruginosaNCTC 862611.12±2.57 mmb
NCTC 1054811.63±1.52 mmb
ATCC BAA-4725 µg/µl[32]
C. albicansATCC 102310 mmb[36]
ATCC 10231>50 µg/µl[32]

Achatina fulica (Ferussac, 1821)Giant African snail or Giant African land snailEast AfricaE. coliIFO 12734MM24 µg/ml[23]

IAM 10112 µg/ml[26]



St aureusIFO 127325 µg/ml[23]


K12 W31100.2 µg/ml[26]

Strep. agalactiaeATCC 124032.1 mg/mlc[37]

Strep. agalactiaeATCC 124033.6 mg/mld

St aureus MRSAe3.3 mg/mlc

E. coli2.4 mg/mlc

E. coli3.8 mg/mld

Achatina CRPAchatina fulica (Ferussac, 1821)Giant African snail or Giant African land snailEast AfricaB. subtilisMTCC 121DDA18 mmf[38]
St aureusMTCC 9614 mmf
E. coliMTCC 6812 mmf
P. aeruginosaMTCC 74111 mmf
Pn. ananatisMTCC 230712 mmf
Achatina CRPAchatina fulica (Ferussac, 1821)Lis. monocytogenesMTCC 637DDA13 mmf[38]
St epidermidisMTCC 263912 mmf
Sal. typhimuriumMTCC 9815 mmf



Achatina fulica (Ferussac, 1821)Giant African snail or Giant African land snailEast AfricaE. coliATCC 25922MM7.5 µg/ml[39]
St aureusATCC 259231.9 µg/ml
B. pyocyaneusCMCCB 101043.75 µg/ml
B. megatherium15 µg/ml
B. dysenteriae3.75 µg/ml
K. pneumoniae30 µg/ml
C. albicansATCC 200327.5 µg/ml
Hemocyanin β c-HaHVRKNVDKLTKDELYDLQRALRDVVAHelix aspersa (Müller, 1774)Garden snailWorldwideE. coliMM30 %g[40]
P. aeruginosa175 %g
St aureus30 %g
Ent. faecium275 %g
St epidermidis30 %g
  1. Ac.: Acinetobacter, B.: Bacillus, C.: Candida, E.: Escherichia, Ent.: Enterococcus, K.: Klebsiella, Lis.: Listeria; Prot.: Proteus, Ps.: Pseudomonas, Pn.: Pantoea, Serr.: Serratia, St.: Staphylococcus, Strep.: Streptococcus, Sal.: Salmonella; V. Vibrio; DDA: Disk Diffusion Assay, MM: Microdilution Method; awith 10 µg of snail slime; bDilution 1/1 of snail slime; cMIC 50; dMIC 90; eMethicillin-Resistant St aureus;fwith 100 µg of Achacin CRP; gBacteria growth with a concentration of 6.5 μM of Hemocyanin β c-HaH.

The Achatina fulica mucus showed a great antibacterial activity against Staphylococcus aureus and Streptococcus epidermidis with high inhibition diameter, expressed in mm [33].

Archachatina marginata mucus was investigated in relationship with the different variety of this snail species, as reported in Table 1. The Archachatina marginata var. saturalis showed different antibacterial activity compared to Archachatina marginata var. ovum [34]. Staphylococcus spp. was inhibited mostly by var. saturalis, while Pseudomonas spp. and Streptococcus spp. resulted more susceptible to var. ovum [34], data showed in Table 1. Another interesting comparison was performed with Archachatina marginata normal skinned and albino skinned mucus samples [35]. The mucus collected from the normal skinned snail showed a more effective antibacterial activity against Staphylococcus spp. and Pseudomonas spp. than the albino skinned snail. Different trends were reported for Escherichia coli and Salmonella spp.; Escherichia coli resulted more susceptible with the albino skinned snail mucus, while Salmonella spp. with the normal skinned snail mucus [35], data reported in Table 1.

The Helix aspersa mucus showed efficient antibacterial activity against two different Pseudomonas aeruginosa strains [36]. The mucus from the same snail also resulted incisive against Streptococcus pyogenes, while no inhibition diameters were evaluated for other tested strains [36]. The Helix aspersa mucus purification was improved by Bortolotti et al. (2016). The mucus extracted showed the same antibacterial activity confirming the data previously evidenced by Pitt et al. (2015).

Achacin [23, 26, 37], Achatin CRP (C-reactive protein) [38] and Mytimacin-AF [39] and Hemocyanin β c-HaH [40] are antimicrobial peptide isolated from Achatina fulica and Helix aspersa mucus, respectively.

Achacin from African giant snail mucus inhibited the growth of Escherichia coli and Staphylococcus aures spp [26]., while the MIC50 value resulted effective against Streptococcus agalactiae and Methicillin-Resistant Staphylococcus aureus (MRSA) [37], as reported in Table 1.

The C-reactive protein Achatin from Achatina fulica mucus showed effective antibacterial activity against Escherichia coli, Pseudomonas aeruginosa, Streptococcus epidermidis and Pantoea ananatis with MIC values, with 100 µg of protein, ranging from 11 to 12 mm, while the most resistant bacteria strain resulted in Bacillus subtilis (18 mm) followed by Salmonella thyphimurium (15 mm) [38].

Two unknown and undefined compounds isolated on TLC (Thin Layer Chromatography) from Achatina fulica mucus showed an inhibition to Escherichia coli and Vibrio cholerae growth [41]. Unfortunately, these antibacterial compounds have not been identified, but it is interesting to continue this research line.

Staphylococcus aureus resulted in the most sensitive bacteria strain subject to antibacterial activity of Mytimacin-AF, a protein from African giant snail mucus, followed by Bacillus pyocyaneus and Bacillus dysenteriae [39]. Bacillus megatherium and Klebsiella pneumoniae showed high resistance to peptide Mytimacin-AF [39], data reported in Table 1.

Hemocyanin β c-HaH from Helix aspersa mucus inhibited the growth of Escherichia coli, Staphylococcus aureus and Staphylococcus epidermidis, while Pseudomonas aeruginosa and Enterococcus faecium have grown unconditionally with the presence of the antimicrobial peptide [40].

Two glycosilated peptides with mass of 4021.04 and 6403.73 Da, isolated from Fraction B of Helix aspersa and Helix lucorum mucus showed inhibition of Propionibacterium acnes, Escherichia coli and Helicobacter pylori growth [42].

Unfortunately, lectin isolated from the Achatina fulica mucus did not show an inhibition activity against Staphylococcus aureus and Escherichia coli even though an hemagglutinating activity was evidenced from the same investigation [43].

Mytimacin-AF showed also an antifungal activity against Candida albicans with a MIC value of 7.5 µg/ml [39], while the Helix aspersa mucus did not show inhibition action against the same yeast [36].

The fraction 39 and fraction 50 from Phyllocaulis boraceiensis, tropical leatherleaf slug, mucus was analyzed using Fourier Transform Infrared Spectrometry (FT-IR) and tested against Measles virus (MV), a single-stranded, negative-sense, enveloped RNA virus of the genus Morbillivirus [44]. The antiviral action could be correlated to polyunsaturated fatty acids in fraction 39, in detail the most active fatty acids against MV were hydroxy-tritriacontapentaenoic acid and hydroxy-pentatriacontapentaenoic acid. Furthermore, the fraction 50 showed a lower antiviral activity against tested virus [44].


From available literature snail and slug mucus and its derivate components, such as achacin, achatina CRP and mytimacin-AF, showed a high activity against Gram positive and Gram negative bacteria, virus and yeast. Moreover, several studies could be carried out on its antimicrobial activity against other microorganisms, especially against multidrug resistant bacteria, such as MRSA (methicillin-resistant Staphylococcus aureus). This is particularly important since one of the major public health problems is currently represented right from the onset by an increasing number of antibiotic resistant bacteria. The indiscriminate use of antibiotics has led to the selection of resistant clones many for which an adequate therapy is often not provided. Multidrug resistant bacteria management requires increasing attention towards the antibacterial molecules or products used. For this reason, researches in recent years has been directed towards the discovery of new antimicrobial substances, particularly natural substances such as plant extracts, essential oils and antimicrobial peptides isolated from many different animals. Based on the results obtained by several studies on the antimicrobial properties of snail and slug mucus, it seems clear that this natural product could be a potential subject of further investigations. The new findings regarding its active components, their inner mechanisms of action and the possibility of isolation and purification of the pure substances, represent a starting point for the formulation of new products for therapeutic and pharmacological uses as an alternative to conventional antibiotics. Natural peptides, as like those extracted from the snail and slug mucus, could be considered as potential alternatives in therapy.


We wish to thank Dr Anna Paola Biagi for the indispensable linguistic assistance provided.

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: None declared.

  3. Employment or leadership: None declared.

  4. Honorarium: None declared.

  5. Competing interests: The funding organization(s) played no role in the study design; in the collection, analysis, and interpretation of data; in the writing of the report; or in the decision to submit the report for publication.


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Received: 2017-12-07
Accepted: 2018-03-12
Published Online: 2018-03-27

© 2018 Walter de Gruyter GmbH, Berlin/Boston

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