90
S. Adeel et al.
distributing the eco-balance. Biotechnology; a cleaner alternative for most the wet
process is achieving contemplation [19]. Thus, collaborative and vigorous research
between biotechnological and textile communities to replace conventional processes
is the need of time.
3.1.1 Bio-desizing
Removal of sizing agents from cotton fabric to make it suitable for further processing is known as “desizing” [16]. Starch and its derivatives due to their low cost,
easy availability with excellent capacity of film formation are considered the most
common substrates [17]. Processes involved in conventional desizing cause’s excessive damage by intensive rinsing to neutralize the substrates and also increase the
pollution load [20]. Bio-desizing by α-amylase has been considered as state of the
art for several years [21]. Yet commercially available α-amylase doesn’t meet with
extreme environmental conditions [17]. Because high desizing efficiency with larger
penetration capacity is usually achieved at a maximum temperature [22]. Therefore
different biotechnological and statistical techniques have has been used to adopt to
make suitable utilization of α-amylase at the industrial level [20, 23]. Treatment of
α-amylase with different ultrasound techniques may enhance the desizing efficiency
in extreme environmental conditions [24, 25]. Literature reported that α-amylase
and glucoamylase could be collectively used for acid-demineralization and desizing simultaneously [26]. Bio-desizing due to its overall quick efficiency to remove
starch makes it the most suitable choice for wet processing [2]. The entire process
of bio-desizing is eco-friendly with minimum production of wastewater [27].
3.1.2 Bio-scouring
The process of scouring is performed to remove natural or synthetic impurities like
esters from the thin outer coating of cuticles, hydrophobic non-cellulosic components especially wax, high molecular weight alcohols [28]. Scouring improves the
fiber wettability which facilitates uniform finishing and dying [29]. Conventional hot
aqueous alkaline treatment yet high resource-consuming techniques are used at high
pH and temperature [30]. Whereas bio-scouring with several enzymes like lipases,
cellulase, cutinases, pectinases, proteases, etc. offers superior flaccidity having a
broader range of pH and temperature without influencing environment and fabric
[31]. Moreover, the expensive nature of chemicals, low effectiveness and comparatively lethargic reaction rates hamper the application of scouring methods in textile
sectors [20]. Pectinases are most effectively applied to remove pectins from both
acidic and basic media at 50–60 °C depending on the type of pectinase [32].
However; the speed and evenness of bio-scouring could be enhanced by the synergistic use of cellulases and pectinases [33]. Bio-scouring of cotton using pectinase
in C 20 H 36 Na 2 O 7 S reversing micellar system is found to be better than conventional
scouring of cotton indicating that bio-scouring is a promising and efficient alternative
S. Adeel et al.
distributing the eco-balance. Biotechnology; a cleaner alternative for most the wet
process is achieving contemplation [19]. Thus, collaborative and vigorous research
between biotechnological and textile communities to replace conventional processes
is the need of time.
3.1.1 Bio-desizing
Removal of sizing agents from cotton fabric to make it suitable for further processing is known as “desizing” [16]. Starch and its derivatives due to their low cost,
easy availability with excellent capacity of film formation are considered the most
common substrates [17]. Processes involved in conventional desizing cause’s excessive damage by intensive rinsing to neutralize the substrates and also increase the
pollution load [20]. Bio-desizing by α-amylase has been considered as state of the
art for several years [21]. Yet commercially available α-amylase doesn’t meet with
extreme environmental conditions [17]. Because high desizing efficiency with larger
penetration capacity is usually achieved at a maximum temperature [22]. Therefore
different biotechnological and statistical techniques have has been used to adopt to
make suitable utilization of α-amylase at the industrial level [20, 23]. Treatment of
α-amylase with different ultrasound techniques may enhance the desizing efficiency
in extreme environmental conditions [24, 25]. Literature reported that α-amylase
and glucoamylase could be collectively used for acid-demineralization and desizing simultaneously [26]. Bio-desizing due to its overall quick efficiency to remove
starch makes it the most suitable choice for wet processing [2]. The entire process
of bio-desizing is eco-friendly with minimum production of wastewater [27].
3.1.2 Bio-scouring
The process of scouring is performed to remove natural or synthetic impurities like
esters from the thin outer coating of cuticles, hydrophobic non-cellulosic components especially wax, high molecular weight alcohols [28]. Scouring improves the
fiber wettability which facilitates uniform finishing and dying [29]. Conventional hot
aqueous alkaline treatment yet high resource-consuming techniques are used at high
pH and temperature [30]. Whereas bio-scouring with several enzymes like lipases,
cellulase, cutinases, pectinases, proteases, etc. offers superior flaccidity having a
broader range of pH and temperature without influencing environment and fabric
[31]. Moreover, the expensive nature of chemicals, low effectiveness and comparatively lethargic reaction rates hamper the application of scouring methods in textile
sectors [20]. Pectinases are most effectively applied to remove pectins from both
acidic and basic media at 50–60 °C depending on the type of pectinase [32].
However; the speed and evenness of bio-scouring could be enhanced by the synergistic use of cellulases and pectinases [33]. Bio-scouring of cotton using pectinase
in C 20 H 36 Na 2 O 7 S reversing micellar system is found to be better than conventional
scouring of cotton indicating that bio-scouring is a promising and efficient alternative