Tetsuya Araki

The University of Tokyo | Todai · Faculty and Graduate School of Agriculture and Life Sceince

Background Plant-based diets have been found to be associated with hypertension. Dietary intake is a dynamic and changing process that can be better characterized by trajectories of dietary indices. However, the associations between plant-based diet trajectories and hypertension over time remained unknown. Methods We used data from the China Healt...

Objective While many Asian countries undergo dietary transitions, little is known about Japan’s dietary pattern changes and their impact on nutritional intake. We aimed to examine 17-year trends in dietary patterns and nutrient intakes in Japan. Design Principal component analysis was used to derive dietary patterns. The nutrient intake of subject...

The digestion behavior of a food bolus comprising bread particles in the presence of gastric peristalsis remains poorly understood. This study systematically investigated the effect of bread type on in vitro gastric digestion behavior using a human gastric digestion simulator (GDS) that is capable of quantitatively simulating gastric peristalsis. A...

Mozzarella is a soft white fermented cheese comprising up to 40% saturated fats and is well known for its stretchability. Consumers’ demand for low‐fat mozzarella cheese (LFMC) has increased with increasing health consciousness. However, the rubbery texture of LFMC tends to lower its acceptability. The study investigates the effect of aloe vera muc...

Low‐fat mozzarella cheese (LFMC) consumption is growing as consumers seek healthy substitutes. However, the rubbery texture and poor meltability of LFMC makes it less appealing to consumers. This study evaluated the effect of basil seed mucilage (BSM) as a fat replacer in LFMC (2% fat). A comprehensive analysis of physicochemical, texture, microstr...

Background: Mozzarella, a stretched curd cheese obtained from buffalo or bovine milk, densely packed with saturated dairy fats, is extensively used in pizza toppings due to the desirable stretch, a vital functional attribute induced by fat-casein matrix. Besides its appreciation in foods by consumers, chronic ailments like obesity, cardiovascular d...

The rate of adult severe obesity has been continually rising in the US. While improving diet quality has been shown to reduce the risk of obesity, few studies have explored the differences in diet quality among adults with overweight and obesity by different weight statuses along with sociodemographic factors and physical activity using data from a...

Non-thermal atmospheric plasma has emerged as a promising alternative sanitizer because of the presence of highly reactive oxygen species (ROS). This study investigated an integrated bubble-assisted method for more efficient distribution of the reactive species. We aimed to evaluate the antibacterial activity of the plasma-bubbling system against E...

This study investigated the potential of non-thermal atmospheric plasma integrated with a bubbling-assisted method as an alternative for fresh produce decontamination strategy. Using a multigas plasma jet with pure oxygen as the primary feeding gas, we evaluated the in-vitro bactericidal effect of the plasma-bubbling system, determined the primary...

Nonthermal atmospheric plasma (NTAP) has emerged as a promising alternative for food disinfection due to the presence of highly reactive oxygen and nitrogen species (RONS). We added a bubble-assisted approach to distribute the reactive species more efficiently, thus resulting in an enhanced antimicrobial effect. The aim of the study was to evaluate...

Plasma-activated water (PAW) has emerged as a promising alternative for food sanitizer due to the presence of highly reactive oxygen and nitrogen species (RONS), which has excellent antibacterial activity. The aim of the study was to evaluate the physicochemical properties, in-vitro antibacterial activity, and the key reactive species contained in...

Strawberries are a high-value fruit with distinctive characteristics, including having a bright red color and juicy texture. The importance of their texture qualities requires the development of non-destructive analytical methods. This study focuses on the use of silicon-based visible–near infrared (Vis-NIR) spectroscopy to predict the texture qual...

A comprehensive assessment of the dietary status of university students in Indonesia is lacking. Hence, this study aims to assess students’ dietary habits, status, and the nutritive value of meals offered at university canteens. This was a cross-sectional study based on the dietary habits of 333 students, 26 of whom were interviewed for the dietary...

Background In the past, wild edible fruits (WEFs) were a significant source of food and nutrition in Bhutan. These nutrient-rich species can enhance food security and alleviate poverty in Bhutan. However, recent developments like the introduction of improved fruit varieties, changes in dietary choices, and infrastructure development are expected to...

Implementation of the Universal Health Coverage (UHC) in Indonesia has created renewed momentum for integrating traditional Indonesian herbal medicine (TIHM) in healthcare delivery under the national health insurance program (NHI). At present, little is known about the attitudes of conventional healthcare practitioners towards the clinical use of T...

Background In the past, wild edible fruits (WEFs) were a significant source of food and nutrition in Bhutan. These nutrient-rich species can enhance food security and poverty alleviation in the country. However, recent developments like the introduction of improved fruit varieties, changes in dietary choices, and infrastructure developments are exp...

Japan is one of the largest consumer markets for chocolate in Asia, which includes the growing craft chocolate industry. However, there is limited literature on craft chocolate in Japan and the craft chocolate industry as a whole. The recent popularity of craft chocolate in Japan implores an investigation of this emerging market. Through an analysi...

Specialty cacao products typically demand higher quality standards in exchange for price premiums or other non-market benefits. Quality characteristics within the context of specialty cacao were investigated after common postharvest treatments, pod storage and fruit maturity. Disease damage, Brix, pH, pod weight, and seed with pulp weight were meas...

This study aims to obtain beneficial ingredients from Citrus natsudaidai (CN) peel waste. The yields of ingredients were 26.2-31.6 mg/g dried material (DM) in pectin, 466-581 mg/g DM in insoluble dietary fiber, 5.56-7.15 g/kg fresh material (FM) in the hexane extracts obtained from CN peels, 23.8-27.0 mg/g DM in naringin, and 8.30-10.2 mg/g DM in n...

Little is known about the macronutrient intake status of adult Chinese people. This cross-sectional study assessed the macronutrient intake status of adults (aged ≥20 years) by comparing their intake level of macronutrients against the Dietary Reference Intakes (DRI). It further explored the associations between macronutrient intake status and age...

The commodity chocolate industry has been long recognized for unsustainable and unethical production practices. In contrast, the craft chocolate industry is well-positioned to move the chocolate industry in the direction of more ethical sourcing strategies, improved environmentally-conscious production practices, and higher quality products as a wh...

Background: Indonesia has committed to achieving Universal Health Coverage (UHC) and introduced national health insurance (JKN) to meet that commitment. Despite the increasing availability of healthcare services under the JKN scheme, traditional medicine (TM) continues to be a significant part of healthcare for Indonesians. In the context of the UH...

The specialty cacao industry is unique in that it is thought to offer higher price premiums and claims to provide cacao farmers with considerably more sustainable resources than traditional cacao systems, prioritizing farmer welfare and environmental resource conservation. However, with poor coherency of industry definition, quality quantifiers, an...

The size, morphology, and distribution of the internal structure of ice cream, such as ice crystal, bubble, and solid content, were determined in samples prepared at four different overrun levels using a cryogenic microtome spectral imaging system (CMtSIS) and X-ray computed tomography (X-ray CT) at the synchrotron facility SPring-8. Ice cream samp...

Researchers and donors consider informal recyclers as an important part of improving waste management in developing countries. This study investigates data relating to the recycling rate of waste pickers in Bantar Gebang, Republic of Indonesia. The study estimates the net weight of soft plastic and hard plastic recycling achieved by these waste pic...

With the rapid increase of waste generation in many developing countries, international donors and researchers have indicated the necessity of incorporating existing informal recycling systems into the operations of formal municipal solid waste management. This paper presents data related to 1) the average household income obtained from waste picki...

Cultured ayu (Plecoglossus altivelis) are screened out at different growing stages of seed production; these larvae are typically underutilized. In this study, the chemical composition and antioxidant activities of the edible parts of these screened ayu (average body weight: 0.65-63.5g) were analyzed. Juvenile cultured ayu with an average body weig...

Citrus natsudaidai is a popular citrus in Japan, but the peel is of limited use and its composition is not well documented. The purposes of this study were to obtain health-beneficial compounds from C. natsudaidai peel for food use by simple methods and to investigate the antioxidant capacities of extracts of different polarities without overestima...

Biodiesel is one of the biofuel being developed and used intensively in Indonesia. Biodiesel can be produced from various oil borne plants, such as palm oil, jatropha curcas, etc. Indonesia mainly uses oil palm (Elaeis guineensis Jacq.) and jatropha (Jatropha curcas L.) as biodiesel feedstock. This is rational since Indonesia is one of main oil pal...

High hydrostatic pressure (HHP) can be an alternative method to steaming to inhibit enzymatic fermentation in green tea making process. However, the effect of HHP treatment on green tea taste is not clear. Thus, this study aimed to determine the effect of HHP on substances associated with green tea taste. Fresh green tea leaves were immediately tre...

The effects of high hydrostatic pressure (HHP) on the physicochemical properties of high-β-glucan barley flour were investigated in the present study. Dough samples were made from two types of barley flour with low and high β-glucan content, respectively, and treated with HHP (200–600 MPa) for 10 min. Although the elevation of pasting properties fo...

Bulky hard peel of Citrus natsudaidai is discarded and not utilized enough in Japan. In this study, the nutritional composition and volatile components of three cultivars of C. natsudaidai peel were determined. Considering the proximate composition and minerals, C. natsudaidai peels showed good carbohydrate and potassium content. The peel color var...

Rapid increase of waste generation coinciding with economic growth is one of the most important social issues in developing countries. Informal recyclers have been seen as important actors to improve the waste management in developing countries by donors and researchers. The objective of this work is to describe the on-site informal recycling syste...

The objective of this work was to establish a three-dimensional measuring method for the size, morphology and distribution of internal structure such as ice crystals, bubbles and solids content within an ice cream sample by using a cryogenic microtome spectral imaging system (CMtSIS). The 3-D images of ice crystals, bubbles and milk solids were rec...

Teikyo Journal of Sociology Vol.31 pp.115-128 : Fieldworks on waste management was conducted in Manila, Jakarta, Kuala Lumpur and Tokyo, with a viewpoint on harmonisation or coordination between official and non-official approaches to municipal waste management and recycling. Major actors were interviewed and characteristic sites were visited at...

Pizza dough samples were frozen and stored at different temperature (-5̊ C,-15̊ C,-25̊ C,-35̊ C and-45̊ C) and for different storage periods (1 day, 15 days, 25 days and 35 days) to measure the baking characteristics of the samples in a hot air (HA) and superheated steam (SHS) oven. Baked samples were employed for the measurement of surface color a...

Application of high-speed shear treatment (HST) to gelatinized high-amylose rice created rice gels with unique viscoelastic properties. This study examined the quantitative relationship between HST conditions and texture, assessing the dynamic viscoelastic properties of high-amylose rice gels based on a second-order polynomial model. Twenty-four HS...

Cooked rice was frozen in an air blast freezer at freezing temperatures of −5, −10, −15, −30 and −45 °C and stored at −5, −10, −15, −30 and −45 °C for up to 90 days. Cross-sectional images were captured using a fluorescence staining method, and then the equivalent diameters and perimeters of ice crystals were determined. The size and fractal dimens...

The internal structures of frozen materials and the formation of bubbles significantly affect the physical properties of such materials as ice cream. Various measurement techniques including optical and scanning electron microscopies, and X-ray microcomputed tomography have been employed to observe bubbles and the internal structures of frozen samp...

The effects of time and temperature on change in bean colour and kinetics of coffee roasting covering pre-roasting and over-roasting condition were investigated. Arabica coffee beans (Colombia Excelso) were dried or roasted in an oven at constant temperatures (140, 180, 200, 220, 260, and 300 °C) to obtain the profiles of mass loss and colour chang...

Relationships among freezing rate, ice crystal size, and color have been elucidated quantitatively to investigate the whitening effect on the surface of salmon fillet during freezing. Both surface color and ice crystal size, dependent on freezing rate, were measured at the surfaces of frozen gelatin as a model food and salmon fillet. As the ice cry...

This study investigated the influence of mixing and fermentation times on the chemical and physical properties of white pan bread, a typical bread consumed in Japan. Sixteen bread samples were made by combining four dough mixing stages and four dough fermentation times, and were analyzed for compression force, acids, sugars, amino acids, volatile c...

We applied freezing for enrichment of functional components in soybean. Water-soaked soybeans were frozen at –20, –80 or –180oC. The radius of Cole-Cole plots decreased with decreasing the freezing temperature. Concentrations of -aminobutyric acid (GABA) as the functional compounds in water-soaked soybeans increased during storage. GABA content in...

We applied freezing for enrichment of functional components in soybean. Water-soaked soybeans were frozen at –20, –80 or –180oC. The radius of Cole-Cole plots decreased with decreasing the freezing temperature. Concentrations of -aminobutyric acid (GABA) as the functional compounds in water-soaked soybeans increased during storage. GABA content in...

Novel methodologies have been developed to predict the values of sensory evaluation score by selecting the combination of measurement methods for grouping viscoelastic parameters, and coupled PLS and ANN modeling have been presented as a quality evaluation model based on the relationship analysis between viscoelastic parameters and sensory scores f...

A quality evaluation model for Cheddar cheeses has been proposed to identify interrelationships among the database of viscoelastic parameters and aroma components obtained from instrumental measurements and both sensory evaluation and palatability scores by utilizing the combination of stepwise PLS-VIP method and ANN modeling. Viscoelastic paramete...

The optimum frozen condition of cooked rice has been predicted by artificial neural network (ANN) based on the data obtained from sensory evaluations as well as viscoelastic measurements. Cooked rice was frozen and stored at -5, -15, and -45 °C for 0, 10, 30, 60 and 90 days. Then, after the samples were thawed by natural convection air at room temp...

The objective of this study was to perform and compare LCA of biodiesel production from crude palm oil and crude Jatropha curcas oil. The system boundary for LCA study from cradle to gate. The produced palm oil biodiesel has higher GWP value than Jatropha curcas biodiesel. Utilization of agrochemical, in form of fertilizer and plant protection, gen...

Fieldworks on waste management was conducted in Manila, Jakarta, Kuala Lumpur and Tokyo, with a viewpoint on harmonisation or coordination between official and non-official approaches to municipal waste management and recycling. Major actors were interviewed and characteristic sites were visited at each location. This exploratory study generated se...

Fieldworks on waste management was conducted in Manila, Jakarta, Kuala Lumpur and Tokyo, with a viewpoint on harmonisation or coordination between official and non-official approaches to municipal waste management and recycling. Major actors were interviewed and characteristic sites were visited at each location. This exploratory study generated se...

A novel technique was developed to recognize ice crystals in biological materials and to analyze their three-dimensional morphology using a Cryogenic Micro-Slicer Spectral Imaging System with a micro-slicer unit and a near-infrared spectral imaging unit. Consecutive cross-sections of a frozen sample were exposed by the multi-slicing operations with...

Optimum temperature conditions of frozen cooked rice during storage have been predicted by artificial neural network (ANN) using the dataset of ice crystal measurement and sensory evaluation. Cooked rice samples were frozen and preserved at -5, -15, -30, and -45°C for 1, 5, 10, 30 and 90 days. Then the cross-sectional images of the samples were cap...

This research focus to collect data from land preparation until biodiesel production in Indonesia.

The gluten matrix in bread dough develops through the mixing process, and its microstructure is known to greatly affect the quality of the end product. In this study, a novel method to quantify the gluten matrix was developed by applying image analysis methods used in the area of bone histomorphometry to fluorescence images of dough. Acquisition of...

The effect of high-amylose rice gel, which was prepared by high-speed shear treatment (HST) of gelatinized rice, added to wheat dough on the physical properties of the obtained bread (rice gel bread) was investigated. Regardless of the amount of additional water, the specific volume of rice gel bread was higher than that of rice porridge bread, whi...

This project compares the situation of waste management in Manila, Jakarta, Kuala Lumpur, and Tokyo.

A consumer-oriented methodological approach for the quality evaluation of Cheddar cheese as a typical fermented food was developed. Datasets were obtained from gas chromatography/olfactometry (GC/O) analysis and sensory evaluation of 10 Cheddar cheese samples. The GC/O analysis identified 43 aroma components under the categories of 14 aroma descrip...

This paper clarifies household income, living and working conditions of dumpsite waste pickers at Bantar Gebang final disposal site for municipal solid waste generated in Jakarta, and investigates the feasibility of integrating the informal sector into formal waste management in Indonesia. The first author did fieldwork for totally 16 months at the...

This article presents informal recycling contributions made by scavengers in the surrounding area of Bantar Gebang final disposal site for municipal solid waste generated in Jakarta. Preliminary fieldwork was conducted through daily conversations with scavengers to identify recycling actors at the site, and then quantitative field surveys were cond...

Pendahuluan Sebagai produksi kelapa sawit terbesar di dunia, Indonesia menggunakan minyak kelapa sawit sebagai bahan baku produksi biodieselnya. Pemerintah Indonesia juga mengidentifikasi bahwa minyak jarak pagar sangat berpotensi untuk dijadikan sebagai bahan baku produksi biodiesel. Inventarisasi data (Life cycle inventory/ LCI) merupakan salah s...

The purpose of this research is to develop a manufacturing method for high-amylose rice noodle using mechanical mixing of gelatinized rice and extrusion. We investigated the relationship between processing conditions and physical properties of rice gel and noodles. Polished high-amylose rice was gelatinized using a rice cooker at two levels of wate...

This paper reviews cold chain trends in East and Southeast Asian regions in terms of socioeconomic perspective. In particular, China has launched a five-year development plan of cold chain logistics for agricultural products to reduce food losses due to the lack of cold chain infrastructure since 2010. However, the available case studies on the col...

China has launched a five-year development plan of cold chain logistics for agricultural products to reduce food losses due to the insufficiency of cold chain infrastructure since 2010. However, the available case studies on the cold chain of frozen food and its consumer acceptance in China remain limited. This paper clarifies 1) the present condit...

An imaging method using fluorescence fingerprints (FFs) for visualizing the distribution of gluten and starch in dough without any staining was developed. Wheat flour dough was mixed up to three stages, i.e., under-mixing, optimum-mixing, and over-mixing, and thin sections of the doughs were prepared with a cryotome. Fluorescence images of the sect...

This paper presents an informal recycling system managed by scavengers in Bantar Gebang final disposal site for municipal solid waste generated in Jakarta. Data were obtained through daily conversations with scavengers who deal with recyclables in the site. Seven processing steps of informal recycling were observed at the site. Scavengers at the si...

Fluorescence fingerprints (FF) of 137 Japanese taro samples and 23 Chinese ones, harvested in 2008, were measured in the excitation and emission wavelengths ranging from 200 to 900 nm at 10 nm intervals after grinding and homogenization. The obtained data set was split into calibration and validation data sets. Canonical discriminant analysis was a...

The most reliable alternative for substitution of the fossil fuel is biodiesel. As one of the world’s largest CPO producer, Indonesia uses CPO to produce biodiesel. European countries claim that production of biodiesel from palm oil contributes carbon emission to atmosphere along its production path. Furthermore, US EPA-NODA states that palm oil ba...