• The Korean Journal of Food And Nutrition
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• v.2 no.2
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• pp.8-13
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• 1989

A strain of Saccharomyces cerevisiae BY-366 was found to produce a strong sucrose-hydrolyzing enzyme Using this strain, the optimal culture conditions for the production of invertase were investigated. The results are as follows : 1. For enzyme production, optimal temperature, initial pH and critical concentrations of sucrose and raffinose were 3$0^{\circ}C$, 5.0 and 3.0%, respectively. 2. Enzyme production was reached maximum by organic nitrogen source, 0.3% yeast extract plus 0.5% bactopeptone. 3. It was appeared the presence of 0.1 M Mn2+ and Fe2+ ion was essential factors, on the other hand, 0.1 M Ag+ and Hg2+ ion almost block in yeast growth and enzyme production. 4. Invertase productivity was reached maximum within 3 days on stationary culture with medium-composed of sucrose 3%, bactopeptone 0.5%, yeast extract 0.3%, KEHPO. 0,1%, MgSO4.7H2O 0.05%.

• The Korean Journal of Food And Nutrition
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• v.2 no.2
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• pp.14-20
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• 1989

A strain of Saccharomyces cerevisiae BY-366 was isolated to produce a strong sucrose-hydrolyzing enzyme. After entrapment of yeast cell invertase with alginate, enzymatic properties of immobilized cells were investigated. The results are as follows. 1. The optimum pH of invertase in immobilized cells and non- immobilized cells was 6.0 and 5.0, and pH stability of invertase in immobilized cells and non- immobilized cells was 6.0 and 5.0, respectively. 2 Activation energy of immobilized cells was 4.7 kcal/mol. 3 The immobilized preparation exhibited high resistance to heat and urea Induced denaturation. 4, The bead size less than 2 mm in diameter was desirable. 5. In spite of repeated use, the enzyme activity of immobilized cells was inhibited slightly in batch reaction, and a small column of the immobilized preparation could hydrolyze relatively high concentration of sucrose almost quantitatively to more than 6 days.

• Journal of Ginseng Research
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• v.14 no.1
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• pp.14-20
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• 1990

In An invertase (EC 3.2.1.26) was extracted from Korean giseng (Panax ginseng C.A. Meyer) with distilled tvater The ginseng invertase was purified about 62.6 folds purified by procedures including ammonium sulfate fractionation , DEAE-cellulofine chromatography and gelfiltrations through Sephadex G-75 and the recovery of enzyme activity was 11.1%. The homogeneity of the purified enzyme was probed by polyacrylamide gel disc electrophoresis. The purifled enzyme was divided into two different subunits by treating with a mixture of SDS and 2-mercautoethanol, and the molecular weight of the large subunit was estimatedtobe 116,000 and that of the small one to be 14,000. The optimal VH and temperature of the enzyme were pH 6 and 45$^{\circ}C$, respectively. The enzyme hydrolyzed specifically the hydrolyzation of the -fructofuranosides such as sucrose, raffinose and inulin. The Km values of the enzyme for sucrose and raffinose were determined to be 0.85 and 0.6 mM, respectively.

• Biotechnology and Bioprocess Engineering:BBE
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• v.7 no.1
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• pp.26-30
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• 2002

A droplet fractionation method was previously developed to concentrate a dilute nonfoaming protein solution. In that earlier study with invertase, it was demonstrated that droplets created by ultrasonic energy waves could be enriched up to 8 times that of the initial dilute invertase solution. In this study, a mixture of bromelain (a foaming protein) and invertase (a nonfoaming protein) is investigated as a preliminary step to determine if droplet fractionation can also be used to separate a non-foaming protein from foaming proteins. The foaming mixture containing bromelain is first removed by bubbling the binary mixture with air. After the foam is removed, the protein rich air-water interfacial layer is skimmed off (prior to droplet fractionation) so as not to interfere with the subsequent droplet production from the remaining bulk liquid, rich in non-foaming protein. Finally, sonic energy waves are then applied to this residual bulk liquid to recover droplets containing the non-foaming protein, presumed to be invertase. The primary control variable used in this droplet fractionation process is the pH, which ranged for separate experiments between 2 and 9. It was observed that the maximum overall protein partition coefficients of 5 and 4 were achieved at pH 2 and 4, respectively, for the initial foaming experiment followed by the post foaming droplet fractionation experiment.

• Journal of Ecology and Environment
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• v.46 no.2
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• pp.136-143
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• 2022

Background: In northern Thailand, the longan flower is the principal nectar source for honey production. Microorganisms play a critical function in the agricultural ecology. The morphological characteristics of fungal species found in longan pollen were studied. Aspergillus spp. were found to be invertase-producing strains and were employed in the longan syrup production process. The purpose of this study was to evaluate the effects of invertase-added longan syrup on the adult honey bee population numbers that were fed by this syrup for 16 weeks. Results: Different fungal species were found in longan pollen samples. Aspergillus was the main genus, with three predominant sections: Nigri, Flavi, and Terrei. Other isolated species were Trichoderma spp., Rhizopus spp., Neurospora spp., Chaetomium spp., Fusarium spp. and Penicillium spp. However, Aspergillus spp. is the only fungal species that produces the enzyme invertase. The invertase-producing strains belonging to the Aspergillus section Nigri were found to be A. niger LP5 with an optimum activity at pH 6.0 and 60℃. When A. niger LP5 invertase was used for longan syrup processing, the highest levels of glucose (3.45%) and fructose (2.08%) were found in invertase added longan syrup (C), while fresh (A) and boiled longan syrup (B) had lower contents of both sugars. The sucrose content was detected in (A) at 4.25%, while (B) and (C) were at 4.02% and 3.08%, respectively. An appropriate amount of sugar to feed and maintain the honey bee population was considered. The data showed no statistically significant differences between the two selected forms of longan syrup compared to the sugar syrup examined by the adult honey bee population. Conclusions: The main species of isolated fungi from longan pollen were Aspergillus spp. The discovery of an invertase-producing strain of A. niger LP5 has enabled its application for enzyme utilization in the invert sugar preparation process. The adult worker bee populations fed by longan syrup from both boiled and invertase-added sources showed an increasing trend. Artificial syrup made from longan fruit to feed honey bees when natural food sources are limited can be applied.

• Current Research on Agriculture and Life Sciences
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• v.6
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• pp.129-135
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• 1988

The changes of sugar content and invertase activity during maturation of plum fruits, and properties of the enzyme were investigated in this study. The soluble sugars in plum fruits were mainly sucrose, glucose and fructose. The sucrose content in the fruit increased slowly at the early stage of maturation and then decreased slightly. At the final stage, the sucrose content increased remarkably with maturation. The contents of glucose and fructose increased slowly at the early stage of maturation following decrement at middle stage. At the final stage, glucose content decreased continuously while fructose content increased again following decrement. Invertase activity in the fruit increased during maturation showing maximum at the onset of color change and after that, decreased remarkably. The optimum pH and temperature of invertase activity were pH 5.0 and $65^{\circ}C$, respectively. The enzyme was most stable at pH 5.0 and retained 75% of its activity after incubation at $70^{\circ}C$ for 15min. The enzyme was activated by $Cu^{{+}{+}}$, $Ca^{{+}{+}}$, but inhibited by $Hg^{{+}{+}}$ remarkably.

• Proceedings of the Korean Society of Plant Pathology Conference
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• 2003.10a
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• pp.74.2-74
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• 2003

Arabidopsis infected with beet curly top virus (BCTV) has the systemic symptoms like stunting of Plant growth, curling of leaves and shoot tips, and callus induction. The regulation of sucrose metabolism by BCTV infection is essential for obtaining the energy source in the process of virus replication and symptom development. Sucrose metabolism-associated gene expression and biochemical enzyme activity were analyzed with the rossette leaves and inflorescencestems of BCTV infected Arabidopsis by the time course of 1, 7, 14, 21 day postinoculation. The expression of invertase and sucrose synthase genes ( encoding sucrose-cleaving enzymes )was increased and reversely the level of Atkin10a ( sucrose non-fermenting gene ) was decreased, resulting by semi-quantitative reverse transcription polymerase chain reaction. The biochemical analysis of invertase and sucrose synthase activity was performed. The activity of neutral invertase in the inflorescence stems was elevated remarkably. The photosynthetic response in the source of sucrose metabolism was consistent with the down-regulation of ribulose 1,5 bisphosphate carboxylase gene, and lower activity than mock-inoculated plants. The levels of genes pertaining to the cell cycle, hormone, and biotic stress-related pathway showed an increase or a decrease dependent on viral symptoms. Therefore, sucrose sensing by BCTV infection can regulate the expression of sucrose metabolism-related key enzymes such as invertase and Atkin10a, and these gene products might influence to symptom development.

• Biotechnology and Bioprocess Engineering:BBE
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• v.6 no.4
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• pp.306-308
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• 2001

A recombinant human growth hormone(hGH) was expressed as a secretory product in the yeast Saccharomyuces cerevisiae. There different leader sequences derived from the mating fac-tor $\alpha$1(MF$\alpha$1) inulinase and invertase were used to direct the secretion of hGH into the extracel-lular medium. Among three leader sequences tested, the inulinase leader sequence was found to be the most efficient in the secretory expression of hGH. In contrast, no hGH was detected in the ex-tracellular medium with the invertase leader sequence. After 48 h shake-flask culture, the yields of hGH secreted into th emedium by the invertase. MF$\alpha$1 inulinase and invertase leader sequences were approximately 0, 0.3 and 0.9 mg/L, respectively. The secretion efficiencies were also found to be 0, 3.8 and 13% for the invertase , MG$\alpha$1 and inulinase leader sequences, respectively.

• Journal of the korean academy of Pediatric Dentistry
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• v.23 no.3
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• pp.706-716
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• 1996

The purpose of this study was to investigate. the effects of the lactation of human or bovine milk and the method of using nursing bottles on the salivary invertase test scores and deciduous caries experience of children. 328 preschool children (boys 178, girls 150) in Iksan city were selected for this study. The parents of the children were asked to answer the questionnaire about the lactation of human or bovine milk and the time of using nursing bottles. The data were obtained from the salvary invertase activity score,(Resazurin Disc Test) deciduous caries experience and the questionnaire. The result were as follows. The invertase activity and caries experience of the human milk higher than that of the bovine milk group(P<0.05). There were significant positive relationships between the lactation period and the invertase activity and between the lactation period and the caries experience(P<0.05). Caries experience had a tendency to increase as the time of using nursing bottles increase (P>0.05).

• Korean Journal of Food Science and Technology
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• v.14 no.1
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• pp.1-5
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• 1982

An invertase from Korean ginseng (Panax ginseng C. A. Mayer) was purified by means of DEAE-cellulose column chromatography and gel-filtration through Sephadex G-75. The homogeneity of the purified invertase was proved by polyacrylamide gel disc electrophoresis. The enzyme was separated into two subunits by SDS-polyacrylamide gel electrophoresis, showing its molecular weights as 48,000. The enzyme preparation showed a characteristic protein UV-spectra.