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Papers by Hilario Taberna

Advances in Social Science, Education and Humanities Research, 2022

Seaweeds are tagged as the medical food of the 21st century due to its being rich in bioactive su... more Seaweeds are tagged as the medical food of the 21st century due to its being rich in bioactive substances, minerals and vitamins. Seaweeds could be processed as wine and could be used as a medicine or a delicacy. The bioactive substances inherent to the seaweed and responsible for its various medicinal properties could be made available during the fermentation process. In this study, wines were produced from three (3) green seaweed species, namely: Halimeda macroloba, Caulerpa sertularioides and Caulerpa racemosa using three (3) kinds of sugar, characterized by its phytochemical profile, total phenolic content (TPC), total flavonoid content (TFC) and total antioxidant activity (TAA), and subjected to sensory evaluation for acceptability. Results show that wines produced from green seaweeds are rich in flavonoids, terpenoids, coumarin and betacyanin. TPC of wines ranged from 54-467 mg Gallic Acid Equivalent (GAE)/L. TFC ranged from 7-356 mg Cathechin Equivalent (CE)/L. TAA ranged from 97-558 mg Ascorbic Acid Equivalent (AAE)/L. In general, wines fermented using muscovado sugar have the highest TPC, TFC and TAA values. The general acceptability of seaweeds wines using a 5-point rating scale ranged from "liked moderately" to "liked very much".

Capiz, being dubbed as the “Seafood Capital of the Philippines,” promotes production of shellfish... more Capiz, being dubbed as the “Seafood Capital of the Philippines,” promotes production of shellfishes. Green mussel ( Perna viridis L.) which is an important shellfish in the province especially in the municipalities of Sapian and Ivisan needs investigation in terms of their health and heavy metal contents to assure the consumers of their food safety. An exploration study on green mussel samples and surface sediments of these two sites were done last Summer of 2013. Allometric parameters to determine volume of sixty samples were obtained from each of the two municipality sites with three sampling stations each (twenty samples from each sampling station) were measured using vernier caliper and their soft tissues were oven-dried. Surface sediments (0-10 cm deep) near the mussel habitat were also collected, air-dried, and sealed. Levels of heavy metals in the mussel and sediment samples were analyzed using acetylene Flame Atomic Absorption Spectrophotometer. Condition Index and Bivalve ...

This study investigated the residual level of polycyclic aromatic hydrocarbons (PAH) in sediments... more This study investigated the residual level of polycyclic aromatic hydrocarbons (PAH) in sediments and shellfishes from some heav- ily impacted areas of Southern Guimaras, Central Philippines two years after the M/T Solar I oil spill. Chemical analysis revealed that the PAH is still within detectable level in some heavily impacted areas of TINMAR and Luzaran in Southern Guimaras, although there was a significant decrease in total PAH of coastal sediments from (3 - 25 ppm) one year after the oil spill to (1 ppb - 17 ppm) two years. However, the total PAH in mangrove surface sediments of TINMAR is relatively lower (<0.16 ppm - 0.8 ppm) and re- mained almost at the same level two years after the oil spill. On the other hand, the shellfishes recorded a more dramatic decrease in PAH from (9.7- 18.7 ppm) one year after the oil spill to (1 ppb - 2.4 ppm) two years after.

Sorbent materials were prepared from two lignocellulosic materials, banana peelings (BP) and rice... more Sorbent materials were prepared from two lignocellulosic materials, banana peelings (BP) and rice husks (RH). Scanning Electron Microscopy (SEM) studies revealed that sorbent from BP has a rough surface with structures of no definite shape and size, while RH sorbents showed smooth surface with regular patterns of structures. Fourier Transfrom Infrared (FT-IR) studies also revealed that both sorbents are rich in –OH, –C=O, –CH2 groups and traces of –C-O stretches. Batch sorption experiments were conducted to assess the surfactants, phenols, and nutrient (N and P) removal potential of the prepared sorbent materials under two initial pH conditions (6 and 9) for both surface and effluent water, and two salinity conditions (3 and 33 ppt) for surface water only. In general, both BP and RH derived sorbent materials showed potential in removing surfactants and phenols from surface waters. Removal of surfactants and phenols was observed to be significantly affected by salinity but not by the...

Sorbent materials were prepared from two lignocellulosic materials, banana peelings (BP) and rice... more Sorbent materials were prepared from two lignocellulosic materials, banana peelings (BP) and rice husks (RH). Scanning Electron Microscopy (SEM) studies revealed that sorbent from BP has a rough surface with structures of no definite shape and size, while RH sorbents showed smooth surface with regular patterns of structures. Fourier Transfrom Infrared (FT-IR) studies also revealed that both sorbents are rich in -OH, -C=O, -CH2 groups and traces of -C-O stretches. Batch sorption experiments were conducted to assess the surfactants, phenols, and nutrient (N and P) removal potential of the prepared sorbent materials under two initial pH conditions (6 and 9) for both surface and effluent water, and two salinity conditions (3 and 33 ppt) for surface water only. In general, both BP and RH derived sorbent materials showed potential in removing surfactants and phenols from surface waters. Removal of surfactants and phenols was observed to be significantly affected by salinity but not by the...

This paper focused on the performance evaluation of a developed Programmable Dehydrator Machine f... more This paper focused on the performance evaluation of a developed Programmable Dehydrator Machine for Herbal Tea Materials (PDMHTM) for drying herbal teas such as Moringa, Guyabano, Guava, and Rosselle. The PDMHTM consists of heat catcher module, a drying chamber, and a control module. The control module is programmable and can be set to the desired temperature, has a multi-display panel and can be viewed online via an open source Internet of Things (IoT) platform to monitor temperature, airflow, and humidity. The system provides the capability to maintain preset temperature regardless of weather conditions using an electric heater. Under the normal conditions wherein solar energy, it is at the peak; the heat catcher can provide an increase of temperature almost 160% of the ambient temperature reducing dry air humidity to almost 35% lower from the ambient relative humidity making the drying process effective and efficient.

Heavy metals released to the estuarine ecosystem usually bind and enriched in sediments by means ... more Heavy metals released to the estuarine ecosystem usually bind and enriched in sediments by means of various processes. These metals can exist in various forms in sediments and are kept bound by different forces depending on the existing environmental conditions. It is essential to study the geochemical behaviour of metals in sediments because the accumulated metals may be subsequently released to the water column by various processes of remobilisation and in changing form can move up to the food chain manifesting toxic effects. In this study, sequential extraction was used to determine the geochemical forms and distribution of Cr, Cu, Ni and Pb in surface sediments of Iloilo river in Central Philippines. Iloilo river is a site of interest because of its great economic and environmental importance. Results show that most of the Cr present in sediments was associated with the residual fraction (6674%), indicating that it is not likely to be released to the water column under normal co...

Environmental Monitoring and Assessment

Bulletin of Environmental Contamination and Toxicology, 2015

This study assessed the toxicity of water-accommodated fraction (WAF) and chemically enhanced WAF... more This study assessed the toxicity of water-accommodated fraction (WAF) and chemically enhanced WAF (CEWAF) of bunker C oil and dispersant (DISP) to a microalga, Tetraselmis tetrathele. The 72-h median effective concentration (72-h EC50) of CEWAF and DISP were determined at 3.30 % and 2.40 %, respectively. The no observed effect concentration (NOEC) of CEWAF to T. tetrathele was at 2.0 % and lowest observed effect concentration (LOEC) was at 3.0 % while NOEC and LOEC of DISP to T. tetrathele were determined at 1.0 % and 2.0 %, respectively. The addition of dispersant to oil increased the amount of total PAH present in the CEWAF test solutions. DISP alone was highly toxic, and the toxicity of CEWAF was primarily caused by the presence of dispersant.

This study investigated the residual level of polycyclic aromatic hydrocarbons (PAH) in sediments... more This study investigated the residual level of polycyclic aromatic hydrocarbons (PAH) in sediments and shellfishes from some heavily impacted areas of Southern Guimaras, Central Philippines two years after the M/T Solar I oil spill. Chemical analysis revealed that the PAH is still within detectable level in some heavily impacted areas of TINMAR and Luzaran in Southern Guimaras, although there was a significant decrease in total PAH of coastal sediments from (3-25 ppm) one year after the oil spill to (1 ppb-17 ppm) two years. However, the total PAH in mangrove surface sediments of TINMAR is relatively lower (<0.16 ppm-0.8 ppm) and remained almost at the same level two years after the oil spill. On the other hand, the shellfishes recorded a more dramatic decrease in PAH from (9.7-18.7 ppm) one year after the oil spill to (1 ppb-2.4 ppm) two years after.

Environmental Monitoring and Assessment, 2010

Following the oil spill accident of the Solar I tanker in 2006 off the coast of Guimaras Island i... more Following the oil spill accident of the Solar I tanker in 2006 off the coast of Guimaras Island in the Philippines, polycyclic aromatic hydrocarbons (PAHs) and alkylated PAHs in some aquatic organisms were investigated at Luzaran in Guimaras and Taklong Islands, which were heavily polluted with spilled oil, immediately and 1 month after the accident. The concentrations of total PAHs were 11.9-52.3 ng/g dry weight in fish. Meanwhile, total PAH concentrations in shellfish were 38.0-3,102 ng/g dry weight in Luzaran and 128-236 ng/g dry weight in Taklong. Pyrene, phenanthrene, and fluoranthene were dominant in most fish and chrysene in all shellfish. Significantly higher concentrations of all alkylated homologs were detected in shellfish than in fish. These differences had two possible causes, that is, the differences between fish and shellfish could be attributed to the uptake routes and/or their metabolizing abilities.

This study investigated the residual level of polycyclic aromatic hydrocarbons (PAH) in sediments... more This study investigated the residual level of polycyclic aromatic hydrocarbons (PAH) in sediments and shellfishes from some heavily impacted areas of Southern Guimaras, Central Philippines two years after the M/T Solar I oil spill. Chemical analysis revealed that the PAH is still within detectable level in some heavily impacted areas of TINMAR and Luzaran in Southern Guimaras, although there was a significant decrease in total PAH of coastal sediments from (3-25 ppm) one year after the oil spill to (1 ppb-17 ppm) two years. However, the total PAH in mangrove surface sediments of TINMAR is relatively lower (<0.16 ppm-0.8 ppm) and remained almost at the same level two years after the oil spill. On the other hand, the shellfishes recorded a more dramatic decrease in PAH from (9.7-18.7 ppm) one year after the oil spill to (1 ppb-2.4 ppm) two years after.

Advances in Social Science, Education and Humanities Research, 2022

Seaweeds are tagged as the medical food of the 21st century due to its being rich in bioactive su... more Seaweeds are tagged as the medical food of the 21st century due to its being rich in bioactive substances, minerals and vitamins. Seaweeds could be processed as wine and could be used as a medicine or a delicacy. The bioactive substances inherent to the seaweed and responsible for its various medicinal properties could be made available during the fermentation process. In this study, wines were produced from three (3) green seaweed species, namely: Halimeda macroloba, Caulerpa sertularioides and Caulerpa racemosa using three (3) kinds of sugar, characterized by its phytochemical profile, total phenolic content (TPC), total flavonoid content (TFC) and total antioxidant activity (TAA), and subjected to sensory evaluation for acceptability. Results show that wines produced from green seaweeds are rich in flavonoids, terpenoids, coumarin and betacyanin. TPC of wines ranged from 54-467 mg Gallic Acid Equivalent (GAE)/L. TFC ranged from 7-356 mg Cathechin Equivalent (CE)/L. TAA ranged from 97-558 mg Ascorbic Acid Equivalent (AAE)/L. In general, wines fermented using muscovado sugar have the highest TPC, TFC and TAA values. The general acceptability of seaweeds wines using a 5-point rating scale ranged from "liked moderately" to "liked very much".

Capiz, being dubbed as the “Seafood Capital of the Philippines,” promotes production of shellfish... more Capiz, being dubbed as the “Seafood Capital of the Philippines,” promotes production of shellfishes. Green mussel ( Perna viridis L.) which is an important shellfish in the province especially in the municipalities of Sapian and Ivisan needs investigation in terms of their health and heavy metal contents to assure the consumers of their food safety. An exploration study on green mussel samples and surface sediments of these two sites were done last Summer of 2013. Allometric parameters to determine volume of sixty samples were obtained from each of the two municipality sites with three sampling stations each (twenty samples from each sampling station) were measured using vernier caliper and their soft tissues were oven-dried. Surface sediments (0-10 cm deep) near the mussel habitat were also collected, air-dried, and sealed. Levels of heavy metals in the mussel and sediment samples were analyzed using acetylene Flame Atomic Absorption Spectrophotometer. Condition Index and Bivalve ...

This study investigated the residual level of polycyclic aromatic hydrocarbons (PAH) in sediments... more This study investigated the residual level of polycyclic aromatic hydrocarbons (PAH) in sediments and shellfishes from some heav- ily impacted areas of Southern Guimaras, Central Philippines two years after the M/T Solar I oil spill. Chemical analysis revealed that the PAH is still within detectable level in some heavily impacted areas of TINMAR and Luzaran in Southern Guimaras, although there was a significant decrease in total PAH of coastal sediments from (3 - 25 ppm) one year after the oil spill to (1 ppb - 17 ppm) two years. However, the total PAH in mangrove surface sediments of TINMAR is relatively lower (<0.16 ppm - 0.8 ppm) and re- mained almost at the same level two years after the oil spill. On the other hand, the shellfishes recorded a more dramatic decrease in PAH from (9.7- 18.7 ppm) one year after the oil spill to (1 ppb - 2.4 ppm) two years after.

Sorbent materials were prepared from two lignocellulosic materials, banana peelings (BP) and rice... more Sorbent materials were prepared from two lignocellulosic materials, banana peelings (BP) and rice husks (RH). Scanning Electron Microscopy (SEM) studies revealed that sorbent from BP has a rough surface with structures of no definite shape and size, while RH sorbents showed smooth surface with regular patterns of structures. Fourier Transfrom Infrared (FT-IR) studies also revealed that both sorbents are rich in –OH, –C=O, –CH2 groups and traces of –C-O stretches. Batch sorption experiments were conducted to assess the surfactants, phenols, and nutrient (N and P) removal potential of the prepared sorbent materials under two initial pH conditions (6 and 9) for both surface and effluent water, and two salinity conditions (3 and 33 ppt) for surface water only. In general, both BP and RH derived sorbent materials showed potential in removing surfactants and phenols from surface waters. Removal of surfactants and phenols was observed to be significantly affected by salinity but not by the...

Sorbent materials were prepared from two lignocellulosic materials, banana peelings (BP) and rice... more Sorbent materials were prepared from two lignocellulosic materials, banana peelings (BP) and rice husks (RH). Scanning Electron Microscopy (SEM) studies revealed that sorbent from BP has a rough surface with structures of no definite shape and size, while RH sorbents showed smooth surface with regular patterns of structures. Fourier Transfrom Infrared (FT-IR) studies also revealed that both sorbents are rich in -OH, -C=O, -CH2 groups and traces of -C-O stretches. Batch sorption experiments were conducted to assess the surfactants, phenols, and nutrient (N and P) removal potential of the prepared sorbent materials under two initial pH conditions (6 and 9) for both surface and effluent water, and two salinity conditions (3 and 33 ppt) for surface water only. In general, both BP and RH derived sorbent materials showed potential in removing surfactants and phenols from surface waters. Removal of surfactants and phenols was observed to be significantly affected by salinity but not by the...

This paper focused on the performance evaluation of a developed Programmable Dehydrator Machine f... more This paper focused on the performance evaluation of a developed Programmable Dehydrator Machine for Herbal Tea Materials (PDMHTM) for drying herbal teas such as Moringa, Guyabano, Guava, and Rosselle. The PDMHTM consists of heat catcher module, a drying chamber, and a control module. The control module is programmable and can be set to the desired temperature, has a multi-display panel and can be viewed online via an open source Internet of Things (IoT) platform to monitor temperature, airflow, and humidity. The system provides the capability to maintain preset temperature regardless of weather conditions using an electric heater. Under the normal conditions wherein solar energy, it is at the peak; the heat catcher can provide an increase of temperature almost 160% of the ambient temperature reducing dry air humidity to almost 35% lower from the ambient relative humidity making the drying process effective and efficient.

Heavy metals released to the estuarine ecosystem usually bind and enriched in sediments by means ... more Heavy metals released to the estuarine ecosystem usually bind and enriched in sediments by means of various processes. These metals can exist in various forms in sediments and are kept bound by different forces depending on the existing environmental conditions. It is essential to study the geochemical behaviour of metals in sediments because the accumulated metals may be subsequently released to the water column by various processes of remobilisation and in changing form can move up to the food chain manifesting toxic effects. In this study, sequential extraction was used to determine the geochemical forms and distribution of Cr, Cu, Ni and Pb in surface sediments of Iloilo river in Central Philippines. Iloilo river is a site of interest because of its great economic and environmental importance. Results show that most of the Cr present in sediments was associated with the residual fraction (6674%), indicating that it is not likely to be released to the water column under normal co...

Environmental Monitoring and Assessment

Bulletin of Environmental Contamination and Toxicology, 2015

This study assessed the toxicity of water-accommodated fraction (WAF) and chemically enhanced WAF... more This study assessed the toxicity of water-accommodated fraction (WAF) and chemically enhanced WAF (CEWAF) of bunker C oil and dispersant (DISP) to a microalga, Tetraselmis tetrathele. The 72-h median effective concentration (72-h EC50) of CEWAF and DISP were determined at 3.30 % and 2.40 %, respectively. The no observed effect concentration (NOEC) of CEWAF to T. tetrathele was at 2.0 % and lowest observed effect concentration (LOEC) was at 3.0 % while NOEC and LOEC of DISP to T. tetrathele were determined at 1.0 % and 2.0 %, respectively. The addition of dispersant to oil increased the amount of total PAH present in the CEWAF test solutions. DISP alone was highly toxic, and the toxicity of CEWAF was primarily caused by the presence of dispersant.

This study investigated the residual level of polycyclic aromatic hydrocarbons (PAH) in sediments... more This study investigated the residual level of polycyclic aromatic hydrocarbons (PAH) in sediments and shellfishes from some heavily impacted areas of Southern Guimaras, Central Philippines two years after the M/T Solar I oil spill. Chemical analysis revealed that the PAH is still within detectable level in some heavily impacted areas of TINMAR and Luzaran in Southern Guimaras, although there was a significant decrease in total PAH of coastal sediments from (3-25 ppm) one year after the oil spill to (1 ppb-17 ppm) two years. However, the total PAH in mangrove surface sediments of TINMAR is relatively lower (<0.16 ppm-0.8 ppm) and remained almost at the same level two years after the oil spill. On the other hand, the shellfishes recorded a more dramatic decrease in PAH from (9.7-18.7 ppm) one year after the oil spill to (1 ppb-2.4 ppm) two years after.

Environmental Monitoring and Assessment, 2010

Following the oil spill accident of the Solar I tanker in 2006 off the coast of Guimaras Island i... more Following the oil spill accident of the Solar I tanker in 2006 off the coast of Guimaras Island in the Philippines, polycyclic aromatic hydrocarbons (PAHs) and alkylated PAHs in some aquatic organisms were investigated at Luzaran in Guimaras and Taklong Islands, which were heavily polluted with spilled oil, immediately and 1 month after the accident. The concentrations of total PAHs were 11.9-52.3 ng/g dry weight in fish. Meanwhile, total PAH concentrations in shellfish were 38.0-3,102 ng/g dry weight in Luzaran and 128-236 ng/g dry weight in Taklong. Pyrene, phenanthrene, and fluoranthene were dominant in most fish and chrysene in all shellfish. Significantly higher concentrations of all alkylated homologs were detected in shellfish than in fish. These differences had two possible causes, that is, the differences between fish and shellfish could be attributed to the uptake routes and/or their metabolizing abilities.

This study investigated the residual level of polycyclic aromatic hydrocarbons (PAH) in sediments... more This study investigated the residual level of polycyclic aromatic hydrocarbons (PAH) in sediments and shellfishes from some heavily impacted areas of Southern Guimaras, Central Philippines two years after the M/T Solar I oil spill. Chemical analysis revealed that the PAH is still within detectable level in some heavily impacted areas of TINMAR and Luzaran in Southern Guimaras, although there was a significant decrease in total PAH of coastal sediments from (3-25 ppm) one year after the oil spill to (1 ppb-17 ppm) two years. However, the total PAH in mangrove surface sediments of TINMAR is relatively lower (<0.16 ppm-0.8 ppm) and remained almost at the same level two years after the oil spill. On the other hand, the shellfishes recorded a more dramatic decrease in PAH from (9.7-18.7 ppm) one year after the oil spill to (1 ppb-2.4 ppm) two years after.