Tocopherols of oil palm leaf1

Kato, Akio; Yamaoka, Masakazu; Gapor, Abdul; Berger, K. G.

doi:10.1007/bf02669973

Cited by 11 publications

(3 citation statements)

References 9 publications

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“…Panels made from leaves had highest TS, which might be related to the nonfibrous structure of such particles probably reduce the binding action. 16 In this study, no wax has been added during panel manufacturing. Therefore by the addition of 1-1.5% of wax could probably improve TS and WA properties of the panels.…”

Section: Mechanical and Physical Propertiesmentioning

confidence: 99%

Evaluations of some properties of exterior particleboard made from oil palm biomass

Hashim

Nadhari

Sulaiman

et al. 2010

Journal of Composite Materials

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This study investigated some physical and mechanical properties of experimental particleboard panels manufactured from different parts of oil palm including bark, leaves, fronds, and trunk consisting of mid-part and core-part using phenol formaldehyde adhesive. Two types of panels with target densities of 0.80 and 1.0 g/cm 3 were manufactured using pressure levels of 5 and 12 MPa, respectively. Both types of panels were pressed at a temperature of 180 C for 20 min. The findings indicated density and pressure level had an influence on the overall properties of the panels. Samples from the core-part had the highest modulus of rupture (MOR) values followed by those panels made from fronds and bark particles. Such samples satisfied MOR characteristics for particleboard type 13 listed in the Japanese Standard. Similarly, panels made from mid-part and leaves also showed satisfactory MOR values for particleboard type 8 based on the same standard. All panels met the IB strength requirement for type 8 except panels made from leaves made at a target density of 1.0 g/cm 3 pressed at 12 MPa. None of the samples satisfied the thickness swelling requirements. The scanning electron microscopy and Fourier transform infrared spectroscopy study indicated positive effect of the resin on interfacial bonding between the particles. Different parts of oil palm may have potential to manufacture exterior particleboard panels with acceptable strength properties. Dimensional properties of the samples need to be enhanced by using different chemicals such as wax or application of various treatments including heat treatment.

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Section: Mechanical and Physical Propertiesmentioning

confidence: 99%

Evaluations of some properties of exterior particleboard made from oil palm biomass

Hashim

Nadhari

Sulaiman

et al. 2010

Journal of Composite Materials

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show abstract

“…The HPLC analysis showed the OPLE contains the main flavonoids as epigallocatechin (800 mg.kg -1 ), catechin (3 g.kg -1 ), epicatechin (100 mg.kg -1 ), epigallocatechin gallate (2.8 g.kg -1 ), epicatechin gallate (500 mg.kg -1 ) and their glucosides [2]. The OPLE contains vitamin E [3] catechins and other flavonoids such as ferulic acid, chlorogenic acids and other bio-phenolic compounds (gallic acid, protocatechuic acid) [2] that were potently antioxidative and phytoestrogenic [4]. The beneficial effects of OPLE are probably caused by the synergistic effects of these compounds with the catechins.…”

Section: Compounds Identified In the Oplementioning

confidence: 99%

Oil Palm Leaf: A New Functional Food Ingredient for Health and Disease Prevention

Mohamed¹

2014

Research Article: J Food Process Technol

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The Oil palm (Elaeis guineensis) leaves has 8% higher total polyphenols content than green tea extract and contains epigallocatechin, catechin, epicatechin, epigallocatechin gallate, epicatechin gallate amongst their various flavonoids glucosides. The health benefits of OPLE on breast cancer, diabetes, hypertension, inflammation, oxidative stress, neurodegeneration, cognitive functions, dyslipidemia, cardiovascular, liver, kidney and neuroprotective properties and hypercholesterol are reviewed. The OPLE have good vasodilative, phytoestrogenic and bone mass enhancing properties, valuable for postmenopausal women. The OPLE helped modulate the antioxidative defence enzymes and reduce blood Low Density Lipoprotein (LDL) by up-regulating the LDL receptors ex vivo. The safety and acute toxicity of OPLE showed a no adverse effect dose at 2 g/kg. Sub-chronic daily supplement of 500 mg/kg body weight (bw) for 3 months in rodents showed no significant adverse effects. The catechin-rich OPLE on its own at 500 mg/kg body weight/day was not toxic to normal rodents under subchronic continuous consumption for 3 months and was shown to be safe for humans at 1 g/day for prolonged periods.

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“…The OPLE reported to contain oil soluble antioxidants, such as a-tocopherol and b-tocopherol. 7 Besides oil soluble antioxidants, water soluble antioxidants were also present in OPLE where the leaves are rich in flavonoids 8 and phenolic acids. [8][9][10][11] The total polyphenols content in OPLE was reported to be higher than green tea extract.…”

Section: Introductionmentioning

confidence: 99%

Skin and Eye Irritation Assessment of Oil Palm (Elaeis guineensis) Leaf Extract for Topical Application

et al. 2018

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Many types of phytochemicals have been found to be present in oil palm leaf and could potentially be used as functional ingredients for skincare product. However, as of today, there is no published report on hazard identification and safety assessment of oil palm ( Elaeis guineensis) leaf extract (OPLE), particularly on skin and eye irritation. In this study, potential hazard of OPLE on skin and eye irritation was evaluated as an initial step to the safety assessment of OPLE. In vitro cell viability study of OPLE on normal human dermal fibroblasts showed that OPLE was nontoxic to the cells with percentage viability more than 90% after 24 and 48 hours of incubation. Skin irritation potential of OPLE was evaluated using in vitro SkinEthic reconstructed human epidermis (RHE) model (Organization for Economic Cooperation and Development [OECD] Test Guideline 439, 2015), while eye irritation potential was evaluated using in vitro SkinEthic Human corneal epithelium (HCE) model (OECD test guideline 492, 2017). Hazard identification results showed that OPLE at 1%, 5%, and 10% (wt/wt) was classified as nonirritant to the skin and eye where mean tissue viabilities of SkinEthic RHE and SkinEthic HCE were more than 50% and 60%, respectively. Therefore, we recommend a further safety assessment, such as human patch testing, to confirm the nonirritant of OPLE.

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Tocopherols of oil palm leaf1

Cited by 11 publications

References 9 publications

Evaluations of some properties of exterior particleboard made from oil palm biomass

Evaluations of some properties of exterior particleboard made from oil palm biomass

Oil Palm Leaf: A New Functional Food Ingredient for Health and Disease Prevention

Skin and Eye Irritation Assessment of Oil Palm (Elaeis guineensis) Leaf Extract for Topical Application

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