Introduction
The literature survey shows that, despite some efforts to apply bibliometric analysis in the fields associated with natural/plant resin1,2, there is still space to explore even more of the several dimensions related to this, often called, forest by-product (in a more reductive approach). Natural resin and gums are relevant complements of timber production in forest areas3.
Bibliometric assessment is an approach that may produce relevant insights as support for the researchers, policymakers and other stakeholders in the diverse science fields, including in the forest domains, allowing to identification of gaps and trends in the literature4. This is particularly important when, in some topics, we need to deal with a great number of documents to survey and understand what was already done and what we still need to do5.
The literature also reveal also that some fields have been poorly addressed in the topics considered in this research, namely those associated with the following areas6: social sciences; economics econometrics and finance; business, management and accounting; and decision sciences.
On the other hand, the areas related to “agricultural and biological sciences” have deserved a relevant attention of the researchers. Some of these studies give relevance to the resin synthesis by the trees7 and others on the resin produced by bees (propolis)8. The propolis is a resinous combination9 that is obtained from plant resin10 and used by the honeybees for their needs in beehives11. This bee glue has several benefits for human health and has been used as an antioxidant or anti-inflammatory, for example12. In some cases, propolis has been considered as a substitute for antibiotics13, including in the poultry industry14. Nonetheless, pests and pathogens, for example, create difficulties for the honeybee’s activities, where the role of the propolis still needs deeper analysis15,16.
Other research focuses associated with natural/plant resin are the following: extraction techniques, related economic dimensions and environmental impacts17; tree response to wounding and fungi18; Dragon’s Blood reddish resin oil19; resin tapping20; and the benefits of Chios mastic gum for human health21.
Considering these perspectives, the aim of this study is to bring more insights into the diverse dimensions of natural/plant resin and make further suggestions for the work plan of COST Action CA22155 (EU-PoTaRCh)22.
Methods
This COST Action has as its scope the “Network for forest by-products charcoal, resin, tar, potash” and aims to analyse, over time, the productions that may be obtained in the forest lands, beyond the timber, highlighting chemical, biological, environmental, socioeconomic and cultural dimensions. EU-PoTaRCh is organised into five working groups focused on fields related to heritage, analytical approaches, archaeology, history and future scenarios22. To achieve the objectives proposed in this research, 4127 documents were obtained from the Scopus database6, in a search carried out on 02 November 2024 (for the topics: “natural resin” or “plant resin”), and were assessed through bibliometric analysis, following the procedures proposed by the Bibliometrix software23–27.
Suggestions, gaps and trends from bibliometric analysis
For the study here presented, the period 1915–2024 was considered, for a total of 1742 sources, 4127 documents, 4.74% of annual growth rate, 20.59 average citations per document, 12538 authors, 3.96 co-authors per document and 12.41% of international co-authorships (Table 1). Molecules, Contact Dermatitis, Phytochemistry, International Journal of Biological Macromolecules, Journal of Chromatography A, Fitoterapia, Food Chemistry and Journal of Agricultural and Food Chemistry are between the top 30 most important sources about the topics of natural resin or plant resin (Table 2). Some of these sources are also among those with the highest impact within the sample considered (Table 3). The most productive authors and those with the highest impact within the sample taken into account are presented in Table 4 and Table 5, respectively.
Table 1. Main information related to natural resin or plant resin.
| Description | Results |
|---|
| Main Information about Data | |
| Timespan | 1915:2024 |
| Sources (Journals, Books, etc) | 1742 |
| Documents | 4127 |
| Annual Growth Rate % | 4.74 |
| Document Average Age | 25.7 |
| Average citations per doc | 20.59 |
| References | 95836 |
| Document Contents | |
| Keywords Plus (ID) | 21866 |
| Author's Keywords (DE) | 6881 |
| Authors | |
| Authors | 12538 |
| Authors of single-authored docs | 626 |
| Authors Collaboration | |
| Single-authored docs | 687 |
| Co-Authors per Doc | 3.96 |
| International co-authorships % | 12.41 |
| Document Types | |
| article | 3663 |
| book | 2 |
| book chapter | 46 |
| conference paper | 108 |
| conference review | 2 |
| data paper | 4 |
| editorial | 11 |
| erratum | 4 |
| letter | 46 |
| note | 29 |
| retracted | 1 |
| review | 201 |
| short survey | 10 |
Table 2. Top 30 most relevant sources related to natural resin or plant resin.
| Source | Articles |
|---|
| Molecules | 97 |
| Contact Dermatitis | 65 |
| Phytochemistry | 45 |
| International Journal of Biological Macromolecules | 43 |
| Journal of Chromatography A | 42 |
| Fitoterapia | 40 |
| Food Chemistry | 40 |
| Journal of Agricultural and Food Chemistry | 37 |
| Scientific Reports | 34 |
| Natural Product Research | 33 |
| Plos One | 33 |
| Journal of Natural Products | 31 |
| Journal of Ethnopharmacology | 28 |
| Meditsina Truda I Promyshlennaya Ekologiya | 28 |
| Gigiena i Sanitariia | 26 |
| Journal of Combinatorial Chemistry | 26 |
| Zhongguo Zhongyao Zazhi | 25 |
| Organic Letters | 20 |
| Journal of the American Chemical Society | 19 |
| Planta Medica | 19 |
| Journal of Natural Medicines | 18 |
| Analytical Biochemistry | 17 |
| International Journal of Molecular Sciences | 17 |
| Operative Dentistry | 17 |
| Analytical and Bioanalytical Chemistry | 16 |
| The Journal of Prosthetic Dentistry | 16 |
| Tree Physiology | 16 |
| Chemistry and Biodiversity | 15 |
| Biotechnic and Histochemistry | 14 |
| Journal of The American Dental Association | 14 |
Table 3. Top 30 sources' local impact related to natural resin or plant resin.
| Source | h_index |
|---|
| Molecules | 26 |
| Food Chemistry | 23 |
| Journal of Agricultural and Food Chemistry | 23 |
| Phytochemistry | 21 |
| Journal of Combinatorial Chemistry | 19 |
| Journal of Chromatography A | 18 |
| Fitoterapia | 17 |
| Journal of Natural Products | 17 |
| Contact Dermatitis | 16 |
| International Journal of Biological Macromolecules | 16 |
| Plos One | 16 |
| Journal of Ethnopharmacology | 15 |
| Tree Physiology | 14 |
| Organic Letters | 13 |
| Operative Dentistry | 12 |
| Phytomedicine | 12 |
| Planta Medica | 12 |
| Analytical and Bioanalytical Chemistry | 11 |
| Organic Geochemistry | 11 |
| Scientific Reports | 11 |
| Analytical Chemistry | 10 |
| Industrial Crops and Products | 10 |
| Journal of The American Chemical Society | 10 |
| Natural Product Research | 10 |
| Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | 10 |
| The Journal of Prosthetic Dentistry | 10 |
| International Journal of Molecular Sciences | 9 |
| Journal of the American Dental Association | 9 |
| Analytical Biochemistry | 8 |
| Biomedicine and Pharmacotherapy | 8 |
Table 4. Top 30 most relevant authors related to natural resin or plant resin.
| Author | Articles |
|---|
| Li J | 37 |
| Wang X | 25 |
| Ono M | 23 |
| Zhang H | 22 |
| Chen Y | 20 |
| Kinjo J | 20 |
| Liu Y | 20 |
| Okawa M | 20 |
| Yoshimitsu H | 20 |
| Yasuda S | 19 |
| Wang J | 18 |
| Zhang J | 18 |
| Cheng Y-X | 17 |
| Chen X | 16 |
| Li Y | 16 |
| Pereda-Miranda R | 16 |
| Wang L | 16 |
| Zhang Y | 16 |
| Anderson KB | 15 |
| Song Z | 15 |
| Wang H | 15 |
| Wang Y | 15 |
| Al-Harrasi A | 14 |
| Chen H | 14 |
| Leonhardt SD | 14 |
| Nohara T | 14 |
| Spivak M | 14 |
| Zhang L | 14 |
| JR | 13 |
| Miyashita H | 13 |
Table 5. Top 30 authors' local impact related to natural resin or plant resin.
| Author | h_index |
|---|
| Li J | 16 |
| Wang X | 14 |
| Chen Y | 13 |
| Zhang H | 13 |
| Liu Y | 12 |
| Pereda-Miranda R | 12 |
| Spivak M | 12 |
| Chen H | 11 |
| Anderson KB | 10 |
| Chen X | 10 |
| Edwards Hgm | 10 |
| Leonhardt SD | 10 |
| Li K | 10 |
| Li Y | 10 |
| Song J | 10 |
| Wang C | 10 |
| Wang J | 10 |
| Wang L | 10 |
| Zhang J | 10 |
| Al-Harrasi A | 9 |
| Colombini MP | 9 |
| Lu Y | 9 |
| Merrifield RB | 9 |
| Wang H | 9 |
| Zhang Y | 9 |
| Cheng Y-X | 8 |
| Kinjo J | 8 |
| Liu X | 8 |
| Nohara T | 8 |
| Okawa M | 8 |
The most important affiliations are the following (Table 6): Tokai University; Beijing University of Chinese Medicine; National and Kapodistrian University of Athens; Chinese Academy of Medical Sciences and Peking Union Medical College; University of Nizwa; Sojo University; Fukuoka University; and China Pharmaceutical University. China, USA, India, Brazil, Japan, Italy, Germany, UK, France, Iran, Greece and Spain are the most productive countries (Table 7) and are among the most cited nations (Table 8).
Table 6. Top 30 most relevant affiliations related to natural resin or plant resin.
| Affiliation | Articles |
|---|
| Tokai University | 111 |
| Beijing University of Chinese Medicine | 90 |
| National and Kapodistrian University of Athens | 62 |
Chinese Academy of Medical Sciences and Peking Union Medical College | 59 |
| University of Nizwa | 59 |
| Sojo University | 55 |
| Fukuoka University | 54 |
| China Pharmaceutical University | 53 |
| Nanjing University of Chinese Medicine | 53 |
| Northwest Aandf University | 53 |
| Shandong University | 51 |
| Nanjing Forestry University | 50 |
| Guangdong Pharmaceutical University | 49 |
| University of Alberta | 48 |
| Institute of Chemical Industry of Forest Products | 46 |
| Shenyang Pharmaceutical University | 46 |
| University of São Paulo | 46 |
| King Saud University | 43 |
| Peking Union Medical College | 43 |
| Universidad Nacional Autónoma de México | 42 |
| Jiangnan University | 40 |
| Guangxi University for Nationalities | 39 |
| Silpakorn University | 39 |
| Notreported | 38 |
| University of Messina | 38 |
| Mashhad University of Medical Sciences | 35 |
| University of Minnesota | 34 |
| Aristotle University of Thessaloniki | 32 |
| Nantong University | 31 |
| Shenzhen University Health Science Center | 31 |
Table 7. Top 30 countries' scientific production related to natural resin or plant resin.
| Country | Number of documents |
|---|
| China | 2830 |
| USA | 1728 |
| India | 989 |
| Brazil | 885 |
| Japan | 674 |
| Italy | 595 |
| Germany | 555 |
| UK | 481 |
| France | 386 |
| Iran | 270 |
| Greece | 251 |
| Spain | 249 |
| Canada | 225 |
| Egypt | 224 |
| Mexico | 214 |
| Poland | 189 |
| South Korea | 178 |
| Australia | 168 |
| Thailand | 163 |
| Turkey | 161 |
| Saudi Arabia | 144 |
| Finland | 143 |
| Romania | 140 |
| Switzerland | 130 |
| Belgium | 118 |
| Sweden | 117 |
| Austria | 114 |
| Chile | 99 |
| Indonesia | 90 |
| Pakistan | 83 |
Table 8. Top 30 most cited countries related to natural resin or plant resin.
| Country | Total Citations |
|---|
| China | 7512 |
| USA | 6685 |
| India | 3645 |
| Brazil | 3555 |
| Germany | 2837 |
| Italy | 2465 |
| Malaysia | 1498 |
| France | 1492 |
| United Kingdom | 1277 |
| Austria | 1178 |
| Canada | 1149 |
| Japan | 1112 |
| Egypt | 1055 |
| Iran | 1032 |
| Greece | 889 |
| Australia | 876 |
| Switzerland | 701 |
| Thailand | 671 |
| Korea | 661 |
| Mexico | 595 |
| Spain | 554 |
| Turkey | 531 |
| Finland | 483 |
| Denmark | 472 |
| Poland | 430 |
| Chile | 343 |
| Singapore | 302 |
| Belgium | 297 |
| Oman | 292 |
| Israel | 284 |
Beyond the topics of search considered in this study (natural resin and plant resin), dragon’s blood and mass spectrometry are examples of the most frequent words in the abstracts of the 4127 documents taken into account in this analysis (Figure 1). Other words appear with lower frequency, such as (Figure 2): amalgam restorations; fatty acids; traditional medicine; natural products; wound healing; mastic gum; antibacterial activity; resin ducts; biological activities; oxidative stress; and resin glycoside.

Figure 1. Most frequent words (in abstracts) related to natural resin or plant resin.

Figure 2. TreeMap (in abstracts) related to natural resin or plant resin.
On the other hand, composite films, glycosidic acid, mechanical properties, chemical composition, mass spectrometry, resin acids, natural resin, dragon’s blood, fatty acids and mastic gum are trending terms (Figure 3). Figure 4 shows (considering information in abstracts and Walktrap clustering algorithm) that amalgam restorations, resin ducts, drug release and controlled release are emerging or declining themes. Resin glycosides is an important theme, but not yet well developed. Electron microscopy, mass spectrometry, chemical composition, traditional medicine and gum resin are important and well-developed themes. Figure 5 (taking into account information in abstracts, Walktrap as clustering algorithm and inclusion index weighted by word-occurrences as weight index) confirms that plant resin and natural resin are trending themes. Figure 6 and Table 9 (factorial analysis in abstracts and multiple correspondence analysis) highlight three clusters for the words present in the abstracts and show that the words considered in cluster 1 are central for the research of the topics here addressed, considering the documents surveyed.

Figure 3. Trend topics (in abstracts) related to natural resin or plant resin.

Figure 4. Thematic map related to natural resin or plant resin.

Figure 5. Thematic evolution related to natural resin or plant resin.

Figure 6. Factorial analysis related to natural resin or plant resin.
Table 9. Words by cluster related to natural resin or plant resin.
| word | cluster |
|---|
| natural.resin | 1 |
| natural.resins | 1 |
| plant.resins | 1 |
| dragons.blood | 1 |
| mass.spectrometry | 1 |
| chemical.composition | 1 |
| resin.acids | 1 |
| plant.resin | 1 |
| essential.oil | 1 |
| resin.glycosides | 1 |
| gum.resin | 1 |
| liquid.chromatography | 1 |
| antioxidant.activity | 1 |
| cell.lines | 1 |
| antimicrobial.activity | 1 |
| traditional.medicine | 1 |
| biological.activities | 1 |
| mechanical.properties | 2 |
| electron.microscopy | 2 |
| scanning.electron | 2 |
| tensile.strength | 2 |
| fourier.transform | 3 |
| infrared.spectroscopy | 3 |
| transform.infrared | 3 |
Discussion and conclusions
This research was developed under the work plan of the COST Action PoTaRCh and aims to bring more contributions to the understanding of the several dimensions related to resin and presents suggestions for future studies associated with these topics. To achieve these objectives, a bibliometric analysis was carried out, following the procedures proposed by the Bibliometrix software. These documents were obtained from the Scopus database, in a search performed on 02 November 2024, for the topics “natural resin” or “plant resin”.
The literature highlights the importance of the natural/plant resin for forest management, considering that this by-product may be an interesting complement of the forest owners’ income. The consideration of alternative and sustainable sources of revenues on forest land, beyond wood production, is crucial to motivate more adjusted forestry planning, namely in contexts where such adjustments are needed and urgent. This is particularly indispensable in frameworks where forest fire prevention requires innovative and effective approaches. The bibliometric analysis may bring important highlights in the literature survey on any topic, including in the fields related to the forest dimensions. On the specific topics covered here, the literature survey reveals that the scientific areas associated with social sciences, economics and management may be further explored in future research. In turn, the areas associated with agricultural and biological sciences have been addressed by a relevant number of documents. In these studies, a relevant part considered the different dimensions of the propolis (resinous combination produced by bees from plant resin). Other studies analysed extraction techniques, tree response to external aggressions, dragon’s blood resin and resin tapping, for example.
The bibliometric assessment highlights a modest international co-authorship of 12.41% and that the most important sources (number of documents and citations) are related, for example, to contact dermatitis, phytochemistry, biological macromolecules, chromatography and food chemistry. This shows that there is shows that there is space to be explored in other sources with scopes more multidisciplinary and focused on other scientific areas. The most productive countries, the topics here addressed, are China, the USA, India and Brazil, revealing that some European countries, for example, where the natural/plant resin has a historical relevance may add important contributions to these fields. The bibliometric analysis also shows that natural resin, plant resin, dragon’s blood, mass spectrometry, chemical composition, resin acids, essential oils, resin glycosides, gum resin, antioxidant activity and traditional medicine are central topics for the topics natural/plant resin. Some of them are also trending topics, such as chemical composition, mass spectrometry, resin acids, natural resin and dragon’s blood.
In terms of practical implications, this research highlights trending themes related to natural/plant resin topics and that some scientific areas, such as social sciences, economics and management, could be further addressed by the literature. In terms of policy recommendations, it is suggested to promote more transdisciplinary approaches in the analyses related to the different dimensions of resin production and collection, to better support the various stakeholders in managing and planning the natural/plant resin activities. For future research, it would be important to increase international co-authorships, promote transdisciplinary co-authorships and consider other bibliometric methodologies.
Data availability statement
No data are associated with this article
Acknowledgements
Furthermore we would like to thank the CERNAS Research Centre and the Polytechnic Institute of Viseu for their support.
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