Ujang Tinggi

Ujang Tinggi
Queensland Health · Forensic and Scientific Services

PhD (Selenium metabolism)

About

60
Publications
15,670
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1,712
Citations
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January 2003 - December 2008
January 1992 - present

Publications

Publications (60)
Article
Full-text available
Terminalia ferdinandiana (or Kakadu plum), a native Australian fruit with potential health benefits, contains bioactive compounds such as ellagic acid (EA), ascorbic acid (AA) and calcium, and antinutrients such as oxalic acid (OA). However, few is known about the biological fate of these compounds following ingestion; therefore, the aim of this st...
Article
Full-text available
Punicalagin, a bioactive ellagitannin predominantly found in Pomegranate, has a wide range of health benefits including potent antioxidant properties. The metabolism of punicalagin in human body produces urolithins and ellagic acid. Ellagic acid is a natural phenolic antioxidant and is also known for its antiproliferative activities. Terminalia fer...
Article
Stingless bee honey (SBH) of four stingless bee species (Heterotrigona itama, Geniotrigona thoracica, Tetragonula carbonaria, and Tetragonula hockingsi) from two geographic regions (Malaysia and Australia, n=36) were studied for their physicochemical parameters, including total phenolic and multi-elemental contents. Sugar analysis confirmed the pro...
Article
Honey is a popular agricultural product containing mostly sugars and water, but due to its nutritious components and natural production by honeybees (Apis mellifera) from floral nectar, it is marketed as a premium health food item. As environmental monitors, honeybees can potentially transfer environmental contaminants to honey. Whilst pesticides c...
Article
Full-text available
The authors wish to make the following correction to the paper [1]:The title of Table 3 “Amino acid (g/100 g dry weight) profile of four different species of wattle seeds” should be changed to “Amino acid (mol% dry weight) profile of four different species of wattle seeds” [...]
Article
Full-text available
Oxalic and phytic acid are phytochemicals considered to be anti-nutritional factors as they are predominantly found as oxalates and phytates bound to minerals like calcium and potassium. Studies have associated excessive oxalate consumption with increased urinary excretion of oxalate (hyperoxaluria) and calcium oxalate kidney stone formation, and e...
Article
Full-text available
Honey is an extensively utilized sweetener containing sugars and water, together with small quantities of vitamins, minerals, fatty acids, amino acids and proteins. Naturally produced by honeybees (Apis mellifera) from floral nectar, honey is increasingly sold as a health food product due to its nutritious features. Certain honeys are retailed as p...
Article
Full-text available
The indigenous endemic plant P. angustifolium has received attention for nutraceutical and therapeutic applications in Australia. This study investigates for the first time the nutritional value (macro- and micronutrients, minerals, trace elements, polyphenols, carotenoids, saponins and antioxidant capacity) and antimicrobial activity of different...
Article
Full-text available
Terminalia ferdinandiana (Kakadu plum) is a native Australian plant containing phytochemicals with antioxidant capacity. In the search for alternatives to synthetic preservatives, antioxidants from plants and herbs are increasingly being investigated for the preservation of food. In this study, extracts were prepared from Terminalia ferdinandiana f...
Article
Full-text available
The impact of plant extracts and phytochemicals on in vitro cell viability is usually assessed by employing cell viability assays dependent upon the activity of dehydrogenase enzymes. The CellTiter 96® AQueous One Solution Cell Proliferation Assay (CellTiter) was used to measure cell viability in response to antioxidant-rich extracts of Terminalia...
Conference Paper
Full-text available
Honey is a widely available natural sweetener containing sugars, and small quantities of vitamins and minerals, proteins, amino acids and fatty acids. Owing to its nutritious components, commercial honeys are sold in bulk blends or as trendy and premium products. Meanwhile, honey bees are considered as environmental monitors and have the potential...
Article
Exposure to toxic metals such as lead (Pb) and cadmium (Cd) from foods is a concern for young children. The aims of the study were to analyse the levels of Pb and Cd in breakfast cereals, rice products and diets of selected children, and to estimate the daily intakes of Pb and Cd in these children. The samples (n = 82) of ready-to-eat breakfast cer...
Article
Full-text available
Terminalia ferdinandiana (Kakadu plum) is a native Australian fruit. Industrial processing of T. ferdinandiana fruits into puree generates seeds as a by-product, which are generally discarded. The aim of our present study was to process the seed to separate the kernel and determine its nutritional composition. The proximate, mineral and fatty acid...
Article
Full-text available
Aim Buchanania obovata Engl., the Green Plum, is a small green fruit eaten by Australian Indigenous peoples of the Northern Territory and Western Australia that has had limited study and has potential as a source of food for diet diversification. The flesh and seed of the fruit are eaten and the plant is used as bush medicine. Methods Physical cha...
Poster
Full-text available
Phytochemistry, Nutritional values, Composition, Bioaccessibility, Absorption, Toxicity
Article
Commercial production systems for wildlife increasingly involve closed-cycle captive breeding, in which effective regulation requires methods for verifying the provenance of stock. We compared the isotopic and elemental compositions of skin from wild and captive-bred pythons raised under different diet regimes in Indonesia and Viet Nam to examine t...
Article
The phenolic ellagic acid (EA) is receiving increasing attention for its nutritional and pharmacological potential as an antioxidant and antimicrobial agent. The Australian native Kakadu plum (Terminala ferdinandiana) fruit is an abundant source of this phytochemical. The fruit also contains large amounts of vitamin C (mainly as ascorbic acid, AA)...
Article
To assess coastal ecosystem status and pollution baselines, prawns were collected from the commercial catches of eight Asia-Pacific countries (Australia, Bangladesh, Indonesia, Myanmar, Philippines, Pakistan, Sri Lanka and Thailand). Samples collected from 21 sites along regional coastlines were analysed for trace metal and stable isotopic composit...
Article
Full-text available
Levels of arsenic in Australian and imported rice (n = 36) were evaluated using inductively coupled plasma mass spectrometry (ICP-MS) for total arsenic and a hyphenated high-performance liquid chromatography ICP-MS system for arsenic species. The study also assessed the daily intake of total As from diets of healthy children (n = 15), collected ove...
Article
This study presents the stable isotopic and elemental compositions of single origin, roasted coffees available to retail consumers. The δ 13C, δ 15N and δ 18O compositions were in agreement with those previously reported for green coffee beans. The δ 15N composition was seen to be related to organic cultivation, reflected in both δ 2H and δ 18O com...
Article
This research has explored the potential of stable isotope and trace metal profiles to distinguish Australian prawns from prawns imported from neighbouring Asian countries. Australian prawns were collected mostly from the Brisbane area. Strong differences in Australian vs. imported prawns were evident from both the isotope and trace element data, w...
Article
This study presents a dataset, derived from the analysis of 162 bottled and canned beers from around the globe, which may be used for comparison with suspected counterfeit or substitute products. The data comprise δ 2H and δ 18O compositions of the whole beer and δ 13C compositions of the dry residue (mostly sugar) together with the concentrations...
Article
Background & aims This study aims to investigate micronutrient balance in children with Cerebral Palsy (CP), due to a paucity of this literature and their well documented issues with undernutrition. Methods Twenty-one children aged 4–12 years with marked CP fed orally (O, n = 12) or enterally (PEG, n = 9) were recruited, including age matched typi...
Article
Full-text available
Children with cerebral palsy (CP) have been documented to have feeding difficulties, which increase in line with condition severity and result in lowered growth potential. Much nutrition literature surrounds energy intake and expenditure in these children, with less information available on other parameters such as protein and micronutrients, which...
Article
Full-text available
Iodine is an essential trace element, and its deficiency has caused concern in many countries. Foods are the principal source of iodine, and its levels are generally low. In this study, selected food items were obtained from food market outlets in Brisbane, Australia. Food samples of dietary intakes of selected healthy children in Brisbane, Austral...
Article
Full-text available
Selenium (Se) is an essential trace element and the clinical consequences of Se deficiency have been well-documented. Se is primarily obtained through the diet and recent studies have suggested that the level of Se in Australian foods is declining. Currently there is limited data on the Se status of the Australian population so the aim of this stud...
Article
Selenium (Se) is an essential trace element, and its low status in humans has been linked to increased risk of various diseases, such as cancer and heart disease. In recent years, Se research has attracted tremendous interest because of its important role in antioxidant selenoproteins for protection against oxidative stress initiated by excess reac...
Article
Full-text available
Out of 247 traditional Chinese medicines (TCM) investigated, a proportion were contaminated with arsenic (5-15%), lead (approximately 5%), and mercury (approximately 65%). Some preparations exceeded the tolerable daily intake (TDI) for males and females for arsenic (4 and 5 products, respectively), lead (1 and 2 products), and mercury (5 and 7 prod...
Chapter
The major route of selenium exposure in humans is through diet. High dietary intakes of selenium have caused toxicity in humans after consuming selenium rich food grown in seleniferous areas. Selenium status in a population varies widely and tends to reflect selenium levels in the soils and the produce of the region. Environmental contamination fro...
Article
Selenium is an essential trace element and its levels in blood have been widely used for assessing Se status in humans. The aim of this present study is to develop a suitable method for the determination of Se in red blood cells (RBC) using ICP-MS after microwave digestion. The blood samples were obtained from patients with benign prostatic hyperpl...
Article
The dietary trace element selenium has been proposed to be a potential chemopreventive agent for prostate cancer. Epidemiological studies have suggested an inverse association between blood selenium and prostate cancer incidence. However, to our knowledge no study to date has examined selenium absorption by the prostate. Therefore, we determine whe...
Article
Selenium (Se) is an essential trace element for animals and humans because of its role in an antioxidant enzyme glutathione peroxidase. This enzyme protects cell membranes from damage caused by the peroxidation of lipids. The paper provides an overview of the effects of Se toxicity and deficiency in humans and animals. It is well established that S...
Article
Fraudulent substitution of a page within a multiple page document such as a will or business contract, the counterfeit manufacture of paper banknotes, and linking ransom or extortion notes have all been the focus of criminal investigations at one time or another. In a recent homicide investigation, document examiners were requested to compare a thr...
Article
Homogenised cow's milk samples were collected each season in 1990 and 1991 from 19 selected dairy factories in different regions across Australia. Fresh cow's milk samples were also collected every month in 1990 and 1991 from 24 selected dairy farms in Queensland. Selenium (Se) analyses were performed by spectrofluorimetry after complexing with 2,3...
Article
Wet digestion using a mixture of nitric, sulfuric, and perchloric acids and an aluminum block digester effectively and rapidly decomposed meat samples for selenium determination by hydride generation atomic absorption spectrophotometry. Digestion did not require constant attention by an operator. Selenium recoveries (range, 94-105%) from National I...
Article
Full-text available
Concentrations of several B-group vitamins, determined by high-performance liquid chromatography (HPLC), and minerals, determined by inductively coupled plasma atomic emission spectroscopy (ICP-AES), in soybeans during different kinema production stages were compared. After soaking soybeans in water, thiamine (B1) content decreased, whereas ribofla...
Article
Samples of peanut products such as peanut butter, raw, roasted and crushed peanuts from various commercial producers and obtained from local markets in Brisbane contained generally low levels of cadmium with mean values ranging from 0.013 to 0.031 mg/kg. These values were lower than the maximum permitted concentration for cadmium in peanuts in Aust...
Article
Wet digestion procedures using acid mixtures of HNO3/H2SO4/HClO4 and HNO3/H2SO4 were investigated for their effectiveness for decomposition of food samples prior to determination of manganese (Mn) and chromium (Cr) by flame and Zeeman graphite furnace atomic absorption spectrophotometry. The addition of hydrofluoric acid (HF) to the mixture of HNO3...
Article
The use of several acid mixtures for digestion of marine biological materials with microwave-assisted heating was investigated. The mixtures of HNO3–H2SO4–H2O2and of HNO3–H2SO4–HCl were most effective after microwave digestion, resulting in complete decomposition of samples. Recoveries of added mercury to marine biological tissues were satisfactory...
Article
Two analytical methods, namely, spectrolluorometry and hydride generation atomic absorption spectrometry (HG-AAS), were used for determining the levels of selenium in food materials. The results of the two methods were compared. The efficiencies of acid mixtures used for decomposition of biological materials were also investigated. Nitric-perchlori...
Article
Three wet digestion procedures, namely, nitric acid/sulphuric acid, nitric acid/hydrogen peroxide and nitric acid/perchloric acid were compared for their relative efficiency in determining cadmium and lead in marine biological tissues. The nitric acid/perchloric acid procedure was the most efficient, whereas the nitric acid/hydrogen peroxide proced...
Article
The trace element status (copper, iron, zinc, manganese, chromium, and selenium) of 20 dietetically treated phenylketonuric (PKU) children was assessed. Significantly higher intakes of copper (p = 0.002) and iron (p = 0.005) were noted in PKU children compared with their siblings. No significant differences were found for zinc, manganese, or chromi...
Article
A method for the determination of cadmium, copper, lead, and zinc in biological tissues using small volumes of digest is described. An aluminium heating block is used to digest samples and elements are determined by spike-height flame atomic absorption spectrometry. Interferences have been assessed and the sample decomposition procedure evaluated.

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Projects (3)
Archived project
A collaboration between Kering, the International Trade Centre (ITC) and the Boa and Python Specialist Group of the International Union for Conservation of Nature (IUCN / SSC Boa & Python Specialist Group), the Python Conservation Partnership was established in November 2013 with the aim of contributing to the improved sustainability of the python skin trade and to help facilitate industry-wide change. The Partnership’s programme of research is focusing on research and recommendations around improving sustainability, transparency, animal welfare and local livelihoods for the python skin trade.