Paper Type |
Contributed Paper |
Title |
Kinetic Parameters of Candida tropicalis TISTR 5306 for Ethanol Production Process Using an Optimal Enzymatic Digestion Strategy of Assorted Grade Longan Solid Waste Powder |
Author |
Saengkae Wattanapanom, Jidapa Muenseema, Charin Techapun, Kittisak Jantanasakulwong, Vorapat Sanguanchaipaiwong, Thanongsak Chaiyaso, Prasert Hanmoungjai, Phisit Seesuriyachan, Julaluk Khemacheewakul, Rojarej Nunta, Sumeth Sommanee, Chatchadaporn Mahakuntha, Supavej Maniyom, Siriwat Jinsiriwanit, Churairat Moukamnerd and Noppol Leksawasdi * |
Email |
noppol@hotmail.com |
Abstract: The optimal enzymatic digestion strategy for assorted grade whole fruit longan solid
waste powder (WF–LSWP) to release the highest level of fermentable sugars for subsequent
production of ethanol using Candida tropicalis TISTR 5306 has been reported for the first time
in this study with several important fermentation kinetic parameters. WF–LSWP contained
relatively low lignin content (5.79 ± 0.43 %(w/w)) with the presence of relatively high starch
and pectin contents of 27.9 ± 0.86% (w/w) and 2.07 ± 0.16% (w/w), respectively. Pretreatment
by alkali and saturated steam before enzymatic digestion step did not result in the improvement
of overall sugars being released. The implementation of commercial enzyme mixture (amylase,
glucoamylase, cellulase, and xylanase) for one step enzymatic digestion at 50oC for 48 h resulted
in the statistical significantly highest (p ≤ 0.05) specific overall sugars productivity of (141 ±
1.4) × 10–4 g total sugars/g WF–LSWP/digestion step/h. Cultivation of C. tropicalis TISTR
5306 in digested and concentrated WF–LSWP extract at concentration level of 90 g/l during
0 – 12 h resulted in the following statistical significantly highest (p ≤ 0.05) kinetic parameters;
specific growth rate (m) of 0.097 ± 0.001 h–1 and specific ethanol production rate (qP) of 0.221
± 0.010 gP/gX/h. Dried biomass yield (YX/S) and ethanol yield (YP/S) based on utilized sugars of
90 g/l WF–LSWP extract at 0.180 ± 0.018 gX/gS and 0.411 ± 0.044 gP/gS, respectively, were
statistical significantly highest (p ≤ 0.05) in comparison with those of 16 and 45 g/l WF–LSWP
extracts. |
|
Start & End Page |
1036 - 1054 |
Received Date |
2019-05-28 |
Revised Date |
|
Accepted Date |
2019-07-17 |
Full Text |
Download |
Keyword |
lignocellulosic materials, longan solid waste powder, Candida tropicalis, enzymatic digestion, pretreatment, ethanol |
Volume |
Vol.46 No.6 (November 2019) |
DOI |
|
Citation |
Wattanapanom S., Muenseema J., Techapun C., Jantanasakulwong K., Sanguanchaipaiwong V., Chaiyaso T., et al., Kinetic Parameters of Candida tropicalis TISTR 5306 for Ethanol Production Process Using an Optimal Enzymatic Digestion Strategy of Assorted Grade Longan Solid Waste Powder, Chiang Mai J. Sci., 2019; 46(6): 1036-1054. |
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