Resinous Research Articles

Optimisation of Retsina Wine Quality: Effects of Resin Concentration, Yeast Strain, and Oak Chip Type.

Retsina, Greece's most renowned traditional wine, has been produced for millennia, with archaeological and historical evidence supporting its legacy. It is legally defined as wine made exclusively in Greece using grape must infused with Aleppo pine resin (Pinus halepensis). This study examines the effects of varying resin concentrations (0.5 g/L and 1 g/L), two commercial yeast strains, and medium-toast oak (Nadalié Cooperage, Ludon-Médoc, France) American and French, on Retsina's chemical and sensory properties to optimise its production. Wine samples from the Savatiano grape variety were analysed for classical wine parameters, oxidation stability, volatile compounds, organic acids, phenolic profiles, and sensory attributes. Principal Component Analysis (PCA) revealed that yeast strain selection significantly influences chemical composition, with Zymaflore X5 associated with higher organic acid levels. Oak addition altered phenolic profiles, with American oak increasing ellagic acid, while non-oaked wines showed higher syringic and p-coumaric acids. Resin addition elevated alpha-pinene, a key marker of resin aroma, but reduced esters linked to fruity and floral notes. These findings highlight the complex interactions between resin, yeast, and oak, offering insights for enhancing Retsina's quality while preserving its traditional character.

Preliminary results in the manufacture of anodic electrodes for potential use in microbial fuel cells.

Abstract Microbial fuel cells are a bioelectrochemical technology that uses different types of waste as fuel sources to generate sustainable and environmentally friendly electricity. Various MFCs have been developed, with the electrode used being a crucial problem due to its high manufacturing cost. This research shows that electrodes can be manufactured quickly and economically using activated carbon (100 g), sugar (80 g), ethanol (250 ml), and pine resin (200 g). For its demonstration, grape waste was used in a single-chamber MFC for 35 days. The manufactured electrode generated a Rint. of 18.471 ± 2.475 Ω, whose current density was 8.348 ±0.768 mW/cm2 at a current density of 5.166 A/cm2. The electrical potential shown was 0.889 ± 0.017 V and 4.571 ± 0.061 mA, with an ORPmax of 81.495 ± 1.874 mV, operating at a pH of 7.26 ±0.19. The micrographs made by scanning electron microscopy showed porous surfaces with carbonaceous substances in the final monitoring stage. These preliminary results showed excellent performance of the electrodes, showing their potential for use in MFCs in an economical way.

Evaluation of the Impact of Pistacia atlantica Desf. Oleo-gum Resin on Complete Freund’s Adjuvant-induced Arthritis in a Wistar Rat Model

Background: Pistacia atlantica Desf., also known as Atlantic pistachio or Mt. Atlas mastic tree, has been used in traditional medicine for its anti-inflammatory properties, helping to reduce inflammation in conditions like arthritis. Additionally, the tree's resin possesses antioxidant properties that can help protect against oxidative stress. The anti-arthritic efficacy of Pistacia atlantica oleo-gum resin extract (PAG) remains unvalidated, as its potential therapeutic benefits have not been substantiated. In the current investigation, we have substantiated the inhibitory properties of the PAG in mitigating the development of rheumatoid arthritis induced by Complete Freund's Adjuvant in rats. Methods: Male Wistar rats weighing 160±10 g were subjected to immunization through intradermal injection of 0.1 mL of Complete Freund's Adjuvant (CFA) into the left hind metatarsal footpad. Following the induction of adjuvant arthritis, oral administration of PAG was initiated at doses of 10, 400, and 800 mg/kg once a day. Prednisolone (10 mg/kg, daily) was employed as a positive control in this study. Various parameters, including paw swelling, arthritic index, body weight loss, spleen index, thymus index, serum cytokines, inflammatory mediators, and histological alterations, as well as nitrite glutathione and catalase level, were measured. Furthermore, the expression and activity of matrix metalloproteinase (MMP)-2 and MMP-9 were evaluated. Results: PAG exhibited noteworthy efficacy in attenuating paw swelling and reducing the arthritic index. Moreover, it resulted in enhanced body weight loss and a consequential reduction in the thymus index. PAG (400mg/kg) significantly decreased the level of serum nitrite in the intervention group, as well as the levels of serum glutathione. On the other hand, catalase activity increased, the activity of MMP-9 decreased, and the level of MMP-2 increased compared to the intervention group. The histopathological results revealed that PAG (at doses of 400 mg/kg) had the best therapeutic effects. Conclusion: In conclusion, the present study confirms the anti-arthritic activity of PAG in rats. The extract of PAG was found to prevent rheumatoid arthritis induced by Complete Freund's Adjuvant, as evidenced by the significant suppression of paw swelling and arthritic index.

Mechanistic insights into the pyrolysis of pine resin sludge based on experiments and ReaxFF-MD simulation: High-value bio-oil production, nitrogen conversion, kinetics and environmental risk assessment

Forestry and agro-industrial waste conversion into high-value chemicals and fuels is considered one of the hottest ongoing research and industrial topics toward sustainable development. As one of the forestry and agro-industrial waste, pine resin sludge (PRS) with amino acids, pine resin residues and their derivatives such as abietic acid and 4-Epidehydroabietal, have ecological toxicity and require environmentally friendly treatment. Herein, a thermal process of PRS that generates high-value biofuels while reducing environmental pollution was reported. The results of the experiment and simulation reveal that the N of bio-oil is the major evolution direction of N, and the nitrogenous gas product is mainly NH3, a useful synthesis gas. ReaxFF-MD simulations elucidated the migration and conversion mechanism of nitrogen in amino acids. The main products of amino acid pyrolysis are 3-oxo-2-Propenenitrile, 2,4-Cyclopentadien-1-ylidenemethanone and 4R)-4-amino-5,5-dihydroxypentanoic acid. PRS's thermal weightlessness was divided into three phases, and the average activation under non-isothermal conditions was calculated at 78.17, 85.68, 206.42 kJ/mol (thermal decomposition) and final 117.78, 149.31, 195.54 kJ/mol (thermal oxidation). Thermal decomposition and oxidation process followed Avrami-Erofeev model (n=2), three-dimensional diffusion model (n=3) and mampel power (n=1). PY-GC/MS analysis shows that pyrolysis at different temperatures recovered mainly 4-Epidehydroabietal (37.15–89.67 %) for potential use as the biosynthesis of dehydrofolate. The bio-oil from PRS pyrolysis shows an excellent yield (31.43 %) and a high calorific value (37.21 MJ/kg), which is comparable to biodiesel. This work focused on offering an appealing and instructive guide for the logical treatment of sludge from pine resin production.

Gambogic acid and chloroquine synergistically induce cell death via increasing mitochondria damage in human NSCLC cells

AbstractGambogic acid is a natural bioactive compound from the brownish resin of the Garcinia hanburyi trees, which has been shown to induce cell death of cancer cells with a synergistic effect together with other compounds. In the present study, we aim to investigate whether the combination of gambogic and chloroquine, one of the inhibitor of autophagy, could increase cell death in human NSCLC cells. As a result, gambogic acid and chloroquine synergistically suppress the growth of NSCLC cells (CI <0.9). Moreover, the combination of gambogic acid and chloroquine significantly promotes apoptosis than that either alone does. Mechanistically, the results demonstrate that gambogic acid increases PINK1 expression at mRNA and protein level, accompanied with downregulation of Tom20, suggesting the mitophagy process is activated. Both silencing PINK1 and treatment of chloroquine could inhibit mitophagy, therefore disrupting the clearance of damaged mitochondria. Thus, co‐treatment of gambogic acid and chloroquine results in an elevated level of ROS, which facilitates cell death. Taken together, our finding highlights that the synergistically inhibitory effect of gambogic acid and chloroquine on NSCLC cells is associated with the accumulation of mitochondrial damage.

Seedling emergence capacity and morphological traits are under strong genetic control in the resin tree Pinus oocarpa

Seedling emergence capacity and morphological traits are under strong genetic control in the resin tree Pinus oocarpa

Interfacial tension and contact angle of asphaltenic and resinous model oil in the presence of binary salts mixtures

Using smart or low salinity waters known as green processes gained increasing attention due to their unique features and their positive impacts on the environment. In light of this fact and since there is limited knowledge about the effects of salts under engineered concentrations or binary mixtures and crude oil fractions on the interfacial tension (IFT) reduction and wettability alteration of the resinous (RSO) and asphaltenic synthetic oil (ASO), the current investigation is designed and performed for the first time. Moreover, the dynamic behavior of the IFT variation was carefully investigated and the relaxation time was obtained and modeled to see the impact of mono and divalent salts individually and in binary conditions. The relaxation times revealed that the lowest adsorption times were obtained for NaCl/CaCl2 brine regardless of the examined oil types of ASO and RSO due to the high movement affinity of the polar functional groups toward the interface consequently reducing the required time for coverage and packing of active agents at the interface. Finally, the measured contact angle values revealed a significant effect of binary salts on the wettability alteration toward strongly water-wet conditions, especially for the RSO and ASO compared with crude oil.

Optimization of Dynamic Headspace Sampling Conditions for the Identification of Paleolithic Adhesives

ABSTRACTThe characterization of Paleolithic adhesives holds great potential for understanding human behavior and its evolution. Gas chromatography–mass spectrometry (GC–MS) is the most accurate identification method; unfortunately, it is destructive and requires a large sample size. Hence, most Paleolithic adhesives are not characterized with GC–MS. Here, a new nondestructive identification method is introduced; dynamic headspace (DHS) with two‐dimensional GC coupled to a time‐of‐flight MS. The DHS extraction is optimized with an experimental design approach. Four parameters were selected, and the optimized values were as follows: incubation temperature: 50°C, incubation time: 20 min, purge volume: 450 mL, and purge flow: 22.5 mL min−1, pine resin was chosen as a proxy for Paleolithic adhesives. Subsequently, DHS was also tested on hide glue, which has less volatile than pine resin, and the universality of the extraction was tested. With untargeted techniques, a distinction between hide glue and pine resin could be made based on their chromatographic profiles. Lastly, DHS was tested against an existing HS‐solid‐phase microextraction method. DHS showed a higher response in the total area of the chemical groups of interest. Thus, DHS has a higher sensitivity for prehistoric adhesives than solid‐phase microextraction, which is desired for minimal samples.

A First Metabolite Analysis of Norfolk Island Pine Resin and Its Hepatoprotective Potential to Alleviate Methotrexate (MTX)-Induced Hepatic Injury.

Drug-induced liver injury (DILI) represents a significant clinical challenge characterized by hepatic dysfunction following exposure to diverse medications. Methotrexate (MTX) is a cornerstone in treating various cancers and autoimmune disorders. However, the clinical utility of MTX is overshadowed by its ability to induce hepatotoxicity. The current study aims to elucidate the hepatoprotective effect of the alcoholic extract of Egyptian Araucaria heterophylla resin (AHR) on MTX-induced liver injury in rats. AHR (100 and 200 mg/kg) significantly decreased hepatic markers (AST, ALT, and ALP), accompanied by an elevation in the antioxidant's markers (SOD, HO-1, and NQO1). AHR extract also significantly inhibited the TGF-β/NF-κB signaling pathway as well as the downstream cascade (IL-6, JAK, STAT-3, and cyclin D). The extract significantly reduced the expression of VEGF and p38 with an elevation in the BCL2 levels, in addition to a significant decrease in the IL-1β and TNF-α levels, with a prominent effect at a high dose (200 mg/kg). Using LC-HRMS/MS analysis, a total of 43 metabolites were tentatively identified, and diterpenes were the major class. This study presents AHR as a promising hepatoprotective agent through inhibition of the TGF-β/NF-κB and JAK/STAT3 pathways, besides its antioxidant and anti-inflammatory effects.

Resin duct production of loblolly pine (Pinus taeda) in southeastern Oklahoma, USA is positively related to water availability, fertilization, and thinning

Bark beetle outbreaks frequently kill large areas of loblolly pine (Pinus taeda). Resin production is the main defense against these insects and resin duct metrics and areas are correlated with both resin flow and tree survival post bark beetle attack. Whether the number, area, or size of resin ducts is increase when trees grow faster or whether there is a tradeoff between tree growth and resin ducts is currently debated. We determined the impacts of water availability (ambient vs 30 % throughfall reduction), nutrient availability (fertilized vs non-fertilized), and thinning on vertical resin duct count (ducts per 5 mm strip of annual ring), density (ducts mm−2), area (duct area per 5 mm strip of annual ring), relative area (% duct area per ring), and average duct size (mm−2) in planted stands of loblolly pine (ages 6–13) in southeastern Oklahoma. Fertilization increased diameter growth (10 %) and metrics that scale to ring width, i.e., duct count (15 %) and duct area (22 %), but also duct relative area (8 %). Throughfall exclusion decreased diameter growth and duct count in some years, increased duct density, and reduced duct average size (8 %). The net effect was that fertilized stands with ambient water availability had the greatest resource availability among treatments in this study and had the greatest duct count, duct area, and duct relative area as well as average duct size greater than the throughfall exclusion treatments. During the post thinning period, i.e., ages 10–13, thinning increased diameter growth from 9.63 to 12.05 mm year−1, duct count from 9.69 to 12.22, duct area from 0.384 to 0.514 mm2, duct relative area from 1.67 % to 1.84 %, and average duct size from 0.0396 to 0.0428 mm2. Earlywood composed approximately 2/3 of the annual ring, but latewood had almost 5 times greater duct density such that there were more ducts and greater duct areas in the latewood. Our assessment of duct metrics provides a link between tree growth rate, resource availability, and duct metrics associated with resistance to bark beetles. Therefore, silvicultural practices used to increase tree growth likely also increase resistance to bark beetles.

Determination of Cell Viability, Apoptotic and Necrotic Activities of Boswellia serrata Extract in Liver Cancer (HepG2) and Breast Cancer (MCF7) Cell Lines

Cancer is a very important disease that has existed for a very long time in the history of humanity and poses a great threat to humanity today. Today, cancer remains a global health problem. The scientific world has introduced many innovative treatment approaches, but due to the complexity of cancer cells and their resistance to treatment, significant progress has been made in the fight against cancer, but a definitive cure has not yet been found. Boswellia serrata has been used in many parts of the world for a variety of ailments from ancient times to the present day, comes from the Burseraceae family and is commonly known as white gum. B. serrata is a resin tree with very small and few leaves, as it is a plant species that grows as a small tree or shrub 4-6 meters high in the desert. In this study, B.serrata resin was obtained commercially in Gaziantep province and obtained by extraction in methanol and hexane solvents. The cytotoxic activity of B. serrata resin extract was determined by MTT Assay (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide). Apoptotic/necrotic activity was determined by double staining (Hoechst 33342 and propidium iodide). Human breast cancer (MCF7) and human liver cancer (HepG2) cell lines were used in these experiments.

Geographic and Climatic Variation in Resin Components and Quality of Pinus oocarpa in Southern Mexico Provenances.

In Mexico, there is a deficit in the production of pine resin, because it relies on natural forests only. Therefore, it is necessary to select provenances and phenotypes of potential species such as P. oocarpa. The objective was to determine the difference between provenances and the variation in resin components and quality, as well as the effect of geographic and climatic factors. Resin from five provenances was collected from southern Mexico. The percentage of rosin, turpentine and water was obtained, as well as the acidity and saponification index. P. oocarpa resin had 80.94% rosin, 7.7% turpentine and 11.49% water. The saponification and acidity index was 125.47 and 117.49 mg KOH.g-1, respectively. All variables showed differences (p ≤ 0.0001) between provenances. The provenance contributed between 6.44 and 11.71% to the total variance, the error contributed between 88.29 and 93.56%. Geographic and climatic variables only had an effect on the percentage of turpentine; the correlation was negative with altitude and longitude, but positive with temperature and precipitation. The results allow defining seed collection sites for resin plantations and orienting the selection for a P. oocarpa improvement program.

Crafting illusions: Human-made composite coating used to simulate amber beads in prehistoric Iberia

The discovery of a set of beads, comprising both Sicilian amber and resin-coated beads in the Middle Bronze Age burial site of Cova del Gegant (Sitges, Barcelona, Spain), has sparked inquiries into whether the coating was intended for imitation or counterfeiting of amber. We assert that human-made materials, such as bead coatings, are intentionally conceived, designed, and crafted to fulfill specific functions. Thus, for an object to effectively fulfill its intended purpose, it must meet particular performance criteria influenced by situational factors.This paper aims to construct an empirically grounded narrative elucidating the development and function of resin-coated bead technology. Our methodology includes a comprehensive quantitative analysis of the coating and beads, an exploration of the interplay between technical choices and situational factors, and an investigation into whether the simulation of sensory performance characteristics played a pivotal role in the concept and design of resin-coated beads. Additionally, we synthesize data to unveil broader patterns related to the crafting and utilization of resin-coated and amber beads across time and space.We have documented resin-coated beads in the Iberian Peninsula from the Neolithic period (5th to 3rd millennia BCE) until at least the Middle Bronze Age (first half of the 2nd millennium BCE), where they coexisted with amber beads. Analysis employing ATR-FTIR and μ-CT imaging has revealed a composite coating comprising pine resin, beeswax, and carotene, adhered to shell beads with bone glue. This composite material represents the earliest known development in human history, unique to the Iberian Peninsula and without parallel in Prehistoric Europe.Our examination of the performance characteristics and functional roles of resin-coated beads suggests their potential as substitutes for amber beads, particularly in regions where amber was scarce or inaccessible. Despite being crafted from commonplace materials, these coated beads exhibit intentional design choices likely aimed at simulating the visual performance characteristics of amber. This deliberate effort, alongside their widespread distribution across time and space, indicates that composite-coated beads held symbolic and social significance akin to amber beads.

ANALISIS SOSIAL EKONOMI PENGELOLAAN HASIL HUTAN DAMAR (Agathis Dammara) DI DESA RAMBATU, KECAMATAN INAMOSOL, KABUPATEN SERAM BAGIAN BARAT

The objectives of this study were to determine the social aspects of resin forest product management, analyze the level of community income in managing resin forest products and determine the contribution of resin forest product income in Rambatu village, Inamosol sub-district, West Seram Regency. This study applied the survey method to collect data from a specific location, namely Rambatu village, using questionnaires and direct interviews with individuals and groups at the research site. The results of the study revealed that the community of Rambatu Village coexists with resin tree species that have become an additional source of income for the local community. By paying attention to the level of community income in managing resin forest products by striving for management without depleting the results of resin trees in Rambatu village and reviewing the contribution of income from resin forest products which is quite helpful to the community's economy, namely 30.52%, this is smaller than the side income of the community reaching 69.48%. Therefore, the management process must cooperate with related parties such as the Vocational Training Center (BLK) to seek the development of knowledge and skills in managing resin forest products properly and correctly and seek a better sales concept between resin workers and collectors so that the income of the Rambatu community increases.

STRATEGI PENGEMBANGAN KEMITRAAN KONSERVASI MELALUI AKSES PEMUNGUTAN HASIL HUTAN BUKAN KAYU DAMAR DI TAMAN NASIONAL MANUSELA

The conservation partnership of the Manusela National Park established collaboration in the form of conservation partnerships with the community in Masihulan Village through community empowerment by giving access to non-timber forest products (NTFPs). This study aimed to formulate a strategy for conservation partnership development. This research used a descriptive qualitative method. The data of this research was analyzed by descriptive qualitative analysis, SWOT analysis, and QSPM analysis to formulate and determine the priority strategy of conservation partnerships development of NTFP utilization. This research shows that the Conservation Partnership in Manusela National Park has economic, social, and ecological impacts. Based on the SWOT matrix analysis, the strategy to develop conservation partnerships in the Manusela National Park is the Strengths and Opportunities (SO) strategy. It is implemented by optimizing its strengths and taking advantage of various existing opportunities by increasing the utilization of resin potency to create creative economic development supported by the Regional Government and mentored by the staff of Manusela National Park, increasing community participation in utilizing and preserving damar trees; and raising the implementation of conservation partnerships and stakeholder cooperation. Based on the QSPM analysis, the highest score of TAS (Total Attractive Score) is 6,35, so the priority strategy to develop conservation partnerships is increasing community participation in utilizing and preserving the resin tree.

Phenolic fingerprint of Macedonian propolis

Propolis is a chemically complex resinous material collected by honeybees (Apis mellifera) from tree buds and resins, comprising plant exudates, secreted substances from bee metabolism, pollen and waxes. Its chemical composition depends strongly on the plant sources available around the beehive, which have a direct impact оn the quality and bioactivity of the propolis. In this study, the composition of phenolic compounds in 13 Macedonian propolis extracts was investigated by HPLC-DAD-ESI-MS/MS. Overall, the UV spectra, the MS and MS/MS data allowed the identification of 36 compounds. The major constituents of propolis were phenolic acids (caffeic and coumaric) and their esters (methyl, (iso)prenyl, benzyl, phenylethyl, cinnamyl), flavonols (quercetin, kaemferol), flavones (chrysin, apigenin, acacetin), flavanonols (pinobanksin) flavanones (pinocembrin naringenin, hesperetin, pinostrobin) and their methylated/esterified derivatives. The results reveal that Macedonian propolis contains a diversity of phenolic compounds confirming that it is a poplar type of propolis with higher phenolic content (ranging from 43.75–637.94 mg/g) than reported in previous studies in the region and beyond in Europe (< 80 mg/g). This suggests the potential significance of Macedonian propolis as a valuable source of bioactive compounds with health benefits as well as for unlocking its economic potential for industry and beekeepers.

Notes on the Nesting Behavior of Four Solitary Wasps (Insecta: Hymenoptera) in India

India is one of countries that has the highest biodiversity level of Hymenoptera in the Oriental region, as well as in the world. Hence, studies of its biology have received a large consideration of entomologists. In a course of study on Hymenoptera in Odisha state of the country in 2015, we observed the nesting behavior of several wasps and recorded their new nesting sites. Therefore, this study presents notes on the nesting behavior of the four Indian wasps, namely, Chalybion bengalense (Dahlbom) (Sphecidae), Trypoxylon petiolatum F. Smith (Crabronidae), Delta esuriens (Fabricius) and Xenorhynchium nitidulum (Fabricius) (both, Vespidae: Eumeninae). The first two wasps used man-made holes on the walls of a big temple for their nesting sites, fully stored paralyzed spiders in the nest cells for offspring and plugged them with mud, in a case of Chalybion bengalense, females added a white layer of unknown material on the outside surface of covers. Delta esuriens chose its nesting site beneath the thatched roof of a human house, built a linear series of pot-shaped mud cells that were firmly attached to some rice blades hung loosely beneath the roof and provisioned caterpillars in these nest cells. The latter built a mud nest on a wall of a human house. Xenorhynchium nitidulum made a nest cell oblique a 30° angle from the vertical surface of the wall, plastered the outside surface of the cell with tree resin of a certain plant species after completion of building and then stored prey of an unknown caterpillar in the cell. The female of Xenorhynchium nitidulum sit in the nest cell after provisioning of the first prey to the following morning suggesting that the wasp progressively provisions its nest and the egg is laid prior to provisioning.

Characterization and identification of an archaeological “lacquer” pipe

A pipe with red coating on the surface was excavated from an archaeological site in Sweden, which is supposed to be a lacquer ware imported from China due to the admiration and pursue of lacquer wares from Asia by Europeans during sixteenth to eighteenth centuries. However, materials such as shellac and resins were often used to imitate lacquer during that time in Europe. To determine whether the pipe was Chinese lacquer ware or not, attenuated total reflection of fourier transform infrared spectroscopy (ATR-FTIR), thermally-assisted hydrolysis and methylation pyrolysis gas chromatography-mass spectrometry (THM-Py-GC/MS) were conducted. The detection of significant amount of aleuritic acid, laccijalaric acid, laccishellolic acid, shellolic acid and jalaric acid represents that shellac is the main material used for the pipe coating rather than Chinese lacquer. Long chain fatty alcohols were found in the sample, indicating that the shellac is un-dewaxed. In addition, pine resin and turpentine were also found as additives in the pipe coating. Furthermore, pigments in the coating were determined as cinnabar and carbon black by scanning electron microscopy with element energy dispersive spectroscopy (SEM–EDS) and Raman spectroscopy. The results could definitely support the conservation of the pipe, and also provide the evidence of the cultural exchange between Europe and Asia.

Effect of Precursor Solvent on the Carbon Micro-Structures Derived from Spray Pyrolysis of Pine Resin (Gondorukem): Preliminary Study

Carbon materials have been widely used in various fields. This study aimed to produce carbon using spray pyrolysis with pine resin (gondorukem) as the precursor and different solvents, namely gondorukem-acetone (GAC), gondorukem-ethyl acetate (GEA), and gondorukem-dichloromethane (GDC). The precursor was prepared in a 1:8 (m/v) ratio, and the spray pyrolysis method was employed by heating the atomized precursor solution in the heating zone of a tube furnace. The atomization precursor was infused with nitrogen gas at a rate of 1 l/min with furnace temperature set at 1000°C with heating times of 5, 10, and 20 mins. The carbonaceous materials produced from the pyrolysis were collected on the wire mesh 1000 that was put on a stainless pipe. Carbon that has been coated on the wire mesh 1000 was analyzed using the optical microscope (OM). The physical properties and morphology of the synthesized carbonaceous material were analyzed using field emission scanning electron microscopy (FE-SEM), Fourier-transform infrared spectroscopy (FTIR), Raman, and Brunaur-Emmett-Teller (BET). Based on FE-SEM analysis, the particle size of the GAC sample has an average of 283.58 nm and the highest carbon content, which reached an average of 97.312 At%. GAC samples had the lowest disorder properties in the Raman spectroscopy test, with the value of ID/IG reaching 0.795764. The functional groups observed were C–H stretching at 2920.49 cm-1, N–H bending at 1629.07 cm-1, and C–O stretching at 1159.70 cm-1. Based on carbon content, disorder properties, and functional group stabilization, carbon from the GAC precursor provides the ideal characteristics to be used as a filter material in medical masks. Meanwhile, based on BET testing, the carbon materials from GEA have the ideal material morphological properties to be used as a filter in medical masks. Spray pyrolysis is an efficient method for producing carbon materials, and the use of gondorukem as the precursor shows great potential for various applications.

Effect of heat treatment at mild temperatures on the composition and physico-chemical properties of Scots pine resin

Effect of heat treatment at mild temperatures on the composition and physico-chemical properties of Scots pine resin