Research articles
ScienceAsia 47S (2021):ID 90-95 |doi:
10.2306/scienceasia1513-1874.2021.S003
Coffee pectin production: An alternative way for
agricultural waste management in coffee farms
Sunita Chamyuanga,b,*, Amorn Owatworakita,b, Uraiwan Intathaa,c, Sitthi Duangpheta,b
ABSTRACT: Chiang Rai Province is home to the largest Arabica coffee plantation, accounting for 16% of coffee
plantation in Thailand. During the green bean production from coffee cherries, 45% of the coffee pulp is treated
as agricultural waste. This study aimed to increase the value of the coffee cherry pulp by using it as an alternative
source of pectin. A double extraction process was used to extract pectin: in the first extraction, acid was used to extract
the coffee pulp, followed by the second extraction with base. Both acid and base solutions yielded from the extractions
were combined prior to the pectin precipitation step. The pectin yield from this double extraction method was 2-fold
higher than that yielded from previous methods. Furthermore, to reduce toxicity during the extraction method, we
use citric acid to replace hydrochloric and nitric acids. Among three heating conditions during extraction: boiling,
autoclave, and microwave, the boiling method gave the highest pectin yield at 15.9%. Unlike the high methoxyl pectin
(HMP) yield from citrus, the coffee pectin from the boiling and microwave-assisted methods was categorized as the
low methoxyl pectin (LMP). The LMP from coffee cherry can be used as prebiotic supplement or in wound dressing
film production. Importantly, producing LMP not only has the potential to reduce post-harvest agricultural waste by
3800 tons per year in Chiang Rai Province but also provides value to agricultural waste and additional income to coffee
growers.
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a |
School of Science, Mae Fah Luang University, Chiang Rai 57100 Thailand |
b |
Microbial Products and Innovation Research Group, Mae Fah Luang University, Chiang Rai 57100
Thailand |
c |
Center of Innovative Materials for Sustainability, Mae Fah Luang University, Chiang Rai 57100 Thailand |
* Corresponding author, E-mail: sunita@mfu.ac.th
Received 11 Nov 2020, Accepted 30 Mar 2021
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