Author
Masayoshi Kobayashi
Bio: Masayoshi Kobayashi is an academic researcher from Kitami Institute of Technology. The author has contributed to research in topics: Adsorption & Catalysis. The author has an hindex of 19, co-authored 111 publications receiving 1485 citations.
Topics: Adsorption, Catalysis, Propene, Carbon monoxide, Heterogeneous catalysis
Papers published on a yearly basis
Papers
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TL;DR: The selective production of organic acids by anaerobic acidogenesis with pH control was examined using a chemostat culture, and the results showed that the product spectrum in the acid reactor strongly depended on the culture pH.
345 citations
TL;DR: In this paper, the first step in the search for a general rule to predict the reaction mechanism in heterogeneous catalysis, based on the mode of the transient response curves of products caused by the concentration jump of the reactants.
92 citations
TL;DR: An effective method for cell harvesting of the halotolerant microalga, Dunaliella tertiolecta ATCC30929, was investigated by increasing the pH of the culture broth using NaOH solution, and suspended D. terfolecta cells rapidly coagulated and settled within a few minutes, which allowed simple harvesting of concentrated cells from theculture broth.
89 citations
TL;DR: Microbial production of xylitol from corn cobs using Candida magnoliae was experimentally investigated and charcoal pellets were found to be effective in selectively removing the inhibitors from the hydrolysates without affecting xylose concentration.
73 citations
TL;DR: It was considered that the dominant microbial populations changed in the acid reactor due to the pH shift, and the main products were changed from butyric acid to acetic and propionic acids.
Abstract: To clarify the dynamic behavior of the anaerobic acid reactor in response to pH changes, a continuous cultivation was performed. By stepwise shifting the culture pH in the acid reactor from 6.0 to 8.0, the main products were changed from butyric acid to acetic and propionic acids. This phenomenon was reproducible, reversible and was not affected by the dilution rate. It was considered that the dominant microbial populations changed in the acid reactor due to the pH shift.
63 citations
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TL;DR: In this paper, the authors highlight the potential of selected by-products as a source of functional compounds and highlight the benefits of using these byproducts as functional compounds in the context of food processing.
Abstract: There is a rapidly growing body of literature covering the role of plant secondary metabolites in food and their potential effects on human health. Furthermore, consumers are increasingly aware of diet related health problems, therefore demanding natural ingredients which are expected to be safe and health-promoting. By-products of plant food processing represent a major disposal problem for the industry concerned, but they are also promising sources of compounds which may be used because of their favourable technological or nutritional properties. The purpose of this review is to highlight the potential of selected by-products as a source of functional compounds.
1,196 citations
TL;DR: A comprehensive review of research achievements on anaerobic digestion developments for biogas production is presented in this article, which includes a discussion of factors affecting efficiency (temperature, pH, C/N ratio, OLR and retention time).
Abstract: With the rising demand for renewable energy and environmental protection, anaerobic digestion of biogas technology has attracted considerable attention within the scientific community. This paper presents a comprehensive review of research achievements on anaerobic digestion developments for biogas production. The review includes a discussion of factors affecting efficiency (temperature, pH, C/N ratio, OLR and retention time), accelerants (greenery biomass, biological pure culture and inorganic additives), reactors (conventional anaerobic reactors, sludge retention reactors and anaerobic membrane reactors) and biogas AD processes (lignocellulose waste, municipal solid waste, food waste, livestock manure and waste activated sludge) based on substrate characteristics and discusses the application of each forementioned aspect. The factors affecting efficiency are crucial to anaerobic digestion, because they play a major role in biogas production and determine the metabolic conditions for microorganism growth. As an additive, an accelerant is not only regarded as a nutrient resource, but can also improve biodegradability. The focus of reactor design is the sufficient utilization of a substrate by changing the feeding method and enhancing the attachment to biomass. The optimal digestion process balances the optimal digest conditions with the cost-optimal input/output ratio. Additionally, establishment of theoretical and technological studies should emphasize practicality based on laboratory-scale experiments because further development of biogas plants would allow for a transition from household to medium- and large-scale projects; therefore, improving stability and efficiency are recommended for advancing AD research.
1,149 citations
TL;DR: In this paper, the authors reviewed the characteristics of food waste, the principles of anaerobic digestion, the process parameters, and two approaches (pretreatment and co-digestion) for enhancing AD in food waste.
Abstract: The uncontrolled discharge of large amounts of food waste (FW) causes severe environmental pollution in many countries. Within different possible treatment routes, anaerobic digestion (AD) of FW into biogas, is a proven and effective solution for FW treatment and valorization. The present paper reviews the characteristics of FW, the principles of AD, the process parameters, and two approaches (pretreatment and co-digestion) for enhancing AD of food waste. Among the successive digestion reactions, hydrolysis is considered to be the rate-limiting step. To enhance the performance of AD, several physical, thermo-chemical, biological or combined pretreatments are reviewed. Moreover, a promising way for improving the performance of AD is the co-digestion of FW with other organic substrates, as confirmed by numerous studies, where a higher buffer capacity and an optimum nutrient balance enhance the biogas/methane yields of the co-digestion system.
971 citations
TL;DR: This article reviewed information from continuous laboratory studies of fermentative hydrogen production useful when considering practical applications of the technology, including the need to manage spore germination and oxygen toxicity on start-up and control sporulation in adverse circumstances during reactor operation.
902 citations
TL;DR: Although significant literature exists on microalgal growth and biochemistry, significantly more work needs to be undertaken to understand and potentially manipulate algal lipid metabolism, which means simulations that incorporate financial elements are likely to be increasingly useful for predicting reactor design efficiency and life cycle analysis.
Abstract: Microalgae provide various potential advantages for biofuel production when compared with ‘traditional’ crops. Specifically, large-scale microalgal culture need not compete for arable land, while in theory their productivity is greater. In consequence, there has been resurgence in interest and a proliferation of algae fuel projects. However, while on a theoretical basis, microalgae may produce between 10- and 100-fold more oil per acre, such capacities have not been validated on a commercial scale. We critically review current designs of algal culture facilities, including photobioreactors and open ponds, with regards to photosynthetic productivity and associated biomass and oil production and include an analysis of alternative approaches using models, balancing space needs, productivity and biomass concentrations, together with nutrient requirements. In the light of the current interest in synthetic genomics and genetic modifications, we also evaluate the options for potential metabolic engineering of the lipid biosynthesis pathways of microalgae. We conclude that although significant literature exists on microalgal growth and biochemistry, significantly more work needs to be undertaken to understand and potentially manipulate algal lipid metabolism. Furthermore, with regards to chemical upgrading of algal lipids and biomass, we describe alternative fuel synthesis routes, and discuss and evaluate the application of catalysts traditionally used for plant oils. Simulations that incorporate financial elements, along with fluid dynamics and algae growth models, are likely to be increasingly useful for predicting reactor design efficiency and life cycle analysis to determine the viability of the various options for large-scale culture. The greatest potential for cost reduction and increased yields most probably lies within closed or hybrid closed–open production systems.
849 citations