Rare Sugar Congress 2023

The 8th International Symposium of International Society of Rare Sugars

March 31 – April 2, 2023

Takamatsu, Kagawa, JAPAN  

Rare Sugar Congress 2023 was concluded successfully on April 2, 2023.
We thank all of you for great supports.

See you again at the next Rare Sugar Congress!

Award Winners

Award Winners of Rare Sugar Congress 2023

Rare Sugar Award

George W.J. Fleet
(Oxford University, UK)

The International Society of Rare Sugars honors his outstanding and unique achievements in rare sugar research, and recognizes his unparalleled contribution by Rare Sugar Award in Rare Sugar Congress 2023.

Best Poster Award

Hiromi Yoshida et al.
(Kagawa University, Japan)
X-ray structure of recombinant ribitol dehydrogenase from Klebsiella oxytoca

Excellent Poster Award

Yusaku Iwasaki et al.
(Kyoto Prefectural University, Japan)
Release of intestinal hormone GLP-1 by D-allulose ameliorates hyperglycemia through gut - vagal afferent nerves - brain axis

Poster Award

Miku Miyoshi et al.
(Kagawa University / Kagawa Prefectural Industrial Technology Center, Japan)
Effect of rare sugars on soy sauce brewing and related microorganisms

Toda Stankovic et al.
(University of Vienna, Austria)
Synthesis of 3-deoxy-3-fluoro-D-xylulose

Kensaku Fukunaga et al.
(Kagawa University, Japan)
A pilot study on the effect of D-allulose on postprandial glucose levels in patients with type 2 diabetes mellitus during Ramadan fasting

Toshihiro Kobayashi et al.
(Kagawa University, Japan)
A study on the effect of D-allulose on suppressing postprandial hyperglycemia in patients with type 2 diabetes

Maho Takezaki et al.
(Kagawa University, Japan)
Functional analysis of rice phosphoglucose isomerase

Photos & Information 

Group Photo & Poster Award

March 31, 2023 [Day 1]
Opening Ceremony ~ Special Sessions / Session 1 / Reception Banquet

April 1, 2023 [Day 2]
Session 2 / Session 3 / Session 4 & Session 5

April 1, 2023 [Day 2]
Poster Session / Award & Closing Ceremony

Photos during the conference can be downloaded from each link.
Photos of each session are currently in no particular order, and will be updated sequentially.
The photos will be available for about 3 months. 

Participants who have registered through the Payvent system and need a receipt or a certificate of attendance
can request them at rsc2023-a@kagawa-u.ac.jp.
They will be provided within approximately one week.


Dear Colleagues -

On behalf of the organizing committee, it is a great honor for me to extend a cordial invitation to you for the Rare Sugar Congress 2023 (RSC2023) - the 8th International Symposium of International Society of Rare Sugars (ISRS). The RSC 2023 will be held from March 31 to April 2, 2023 at the Kagawa International Conference Hall (Takamatsu, Kagawa, JAPAN). Please enjoy the RSC2023 in a cozy spring in full blossom of cherry trees (Sakura). We look forward to your visit!

Ken IZUMORI (President of ISRS, Kagawa University)

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    Online Registration

    Online registration started on November 1, 2022.
    The regular registration closed on December 23, 2022.
    The late registration is available now.

    Start Registraion »

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    Poster & Oral Preparation

    Abstract submission started on November 1, 2022 and closed on January 6, 2023.
    Accepted poster and oral presentations are shown in linked page.

    Preparation Guides »

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    Sponsorship Information

    ISRS provides numerous sponsorship opportunities for the Rare Sugar Congress 2023 (RSC2023).


    Learn more »


Rare Sugar Congress 2023 will be held in Kagawa International Conference Hall (Takamatsu, Kagawa, Japan) as the 8th International Symposium of ISRS (International Society of Rare Sugars).

Online registration is closed on April 2, 2023

Overall Schedule
Special Keynote lecture / Special lecture / Special Program "Labeling of Rare Sugars"

 Final Schedule is opend.

Reviewing process of submitted abstracts was completed:
Authors selected for an invited oral presentation were informed via email on January 20, 2023.
Abstract submission closed on January 6, 2023
Due date for Abstract submission was extended:
Extended due was January 6, 2023 (Fri)
Abstract submission started on November 1, 2022
Registration started on November 1, 2022
Third circulation on October 31, 2022
Second circulation on September 12, 2022
First circulation on July 12, 2022



Rare Sugar Congress

The Rare Sugar Congress (RSC) is  held as the International Symposium of ISRS approximately every three years for the exchange of information on various aspects of rare sugars, from production to application.



Conference Vanue

Kagawa International Conference Hall (Takamatsu, Kagawa, Japan)


Overall Schedule


Download Final Program »

Final program available for download

Friday 31 March 2023




Opening Ceremony & Keynote Address

Keynote Address
(K. Izumori, Kagawa University, Japan)


Special Sessions


Special Lectures

(Chair: Y. Tani, Rare Sugar International Corporation, Japan)

Special Lecture Information »

Special Keynote Lecture "Health & Carbohydrate"
(S. Yamada, Kitasato University Kitasato Institute Hospital, Japan )

Special Lecture "Nutrition & Health"


 Special Program "Labeling of Rare Sugars"

(Chair: Y. Tani, Rare Sugar International Corporation, Japan)

Special Program Information »

Panel Discussion I:  "Rare Sugar Labeling in Markets"
Panel Discussion II:  "A Proposal for Functional Sugars in Future"


Oral Session


Oral Presentations

Oral presentation preparation »

Session 1: Food-related properties of rare Sugars


 Reception Banquet

at RIHGA Hotel Zest Takamatsu Kagawa

Map & Direction


 Saturday 1 April 2023

Oral Sessions


Oral Presentations 

Oral presentation preparation »

Session 2: Rare sugar production
Session 3: Rare sugars for medical field
Session 4: Physicochemical properties of rare sugars
Session 5: Various usages of rare sugars


Sunday 2 April 2023

Poster Session


Poster Presentations

Poster preparation »

Odd numbered posters: 9:30–10:30
Even numbered posters: 10:30–11:30


Award & Closing Ceremony




Travel Information 

Takamatsu is the largest city in Kagawa Prefecture, part of the Shikoku region of Japan. This scenic location is travel destination close to Osaka, Kyoto, and the Kansai area. In this season, cherry flowers are as beautiful as they are ephemeral, and the best period to see them in full bloom. Hanami (cherry blossoms viewing) is a centenary tradition that permeates the whole Japan and of couse there are many attractive spots to view them in Kagawa area. These links are the official tourism websites by public institutions which covers things to do and travel tips.

TAKAMATSU Convention and Visitors Bureau
Experience TAKAMATSU



Sponsored and Supported by 

Kagawa University

Kagawa University IIRSRE

Kagawa Prefecture MICE

TAKAMATSU Convention and Visitors Bureau

Kagawa Industory Support


Contact Information

International Society of Rare Sugars 
Ikenobe 2393, Miki, Kagawa
761-0795, JAPAN
Secretarial Board 
Dr. Kazuya Akimitsu
P: +81(87) 891-3131