34. Match the entries in Group I with that in Group II

Group I	Group II
P) Phytase	1) Paper and pulp processing
Q) Xylanase	2) Delignification
R) Laccase	3) Gluten complex reduction
S) Bromelain	4) Improve mineral availability
5) Phosphorylation

(A) P-4, Q-1, R-3, S-5
(B) P-4, Q-1, R-2, S-3
(C) P-5, Q-4, R-5, S-2
(D) P-5, Q-1, R-2, S-3

Industrial Enzymes and Their Applications: Phytase, Xylanase, Laccase, and Bromelain Explained

Introduction

Industrial enzymes have transformed modern biotechnology by providing environmentally friendly, highly specific, and cost-effective alternatives to conventional chemical processes. These biological catalysts are extensively used in industries such as food processing, paper and pulp manufacturing, animal nutrition, textile production, pharmaceuticals, environmental biotechnology, and agriculture. Because enzymes function under mild conditions and produce fewer harmful by-products, they are considered essential tools in sustainable industrial development.

Among the numerous commercially important enzymes, phytase, xylanase, laccase, and bromelain have widespread industrial significance. Phytase improves mineral bioavailability in animal feed, xylanase is extensively used in the paper and pulp industry, laccase participates in lignin degradation during biobleaching and delignification, while bromelain is employed in the food industry to reduce gluten complexes and modify proteins.

Correct Answer

Correct Option: (B)

P – 4, Q – 1, R – 2, S – 3

Detailed Explanation

Phytase is an enzyme that hydrolyzes phytic acid (phytate), the principal storage form of phosphorus in plant seeds. Since phytate binds essential minerals such as calcium, zinc, iron, and magnesium, these minerals become poorly available for absorption in monogastric animals. Addition of phytase to animal feed releases phosphate and improves mineral bioavailability while reducing phosphorus pollution in the environment. Therefore, phytase is correctly matched with improve mineral availability.

Xylanase hydrolyzes xylan, a major hemicellulose component of plant cell walls. It is widely used in the paper and pulp industry for biobleaching, reducing chlorine consumption, improving pulp quality, and enhancing paper brightness. Consequently, xylanase is matched with paper and pulp processing.

Laccase is a multicopper oxidase capable of oxidizing lignin and various phenolic compounds. It plays an important role in delignification during biopulping and biobleaching processes, making paper production more environmentally friendly.

Bromelain, a proteolytic enzyme obtained primarily from pineapple stems and fruits, hydrolyzes peptide bonds in proteins. In food processing, bromelain reduces the strength of gluten complexes, improving dough properties and modifying food texture. Therefore, bromelain is correctly matched with gluten complex reduction.

Thus, the correct matching is:

Phytase → Improve mineral availability
Xylanase → Paper and pulp processing
Laccase → Delignification
Bromelain → Gluten complex reduction

Explanation of Each Match

P. Phytase → Improve Mineral Availability

This match is correct. Phytase breaks down phytate, releasing phosphate and increasing the availability of essential minerals in animal feed.

Q. Xylanase → Paper and Pulp Processing

This match is correct. Xylanase degrades hemicellulose, facilitating pulp bleaching while reducing chemical consumption.

R. Laccase → Delignification

This match is correct. Laccase oxidizes lignin polymers, making it valuable for environmentally friendly delignification and biobleaching.

S. Bromelain → Gluten Complex Reduction

This match is correct. Bromelain is a protease that hydrolyzes gluten proteins, improving dough handling and food processing.

Why Option (B) is Correct

Option (B) correctly associates each enzyme with its most important industrial application:

Phytase → Improve mineral availability
Xylanase → Paper and pulp processing
Laccase → Delignification
Bromelain → Gluten complex reduction

Why the Other Options are Incorrect

Option (A)

This option incorrectly matches laccase with gluten complex reduction and phytase with phosphorylation.

Option (C)

This option incorrectly assigns phytase to phosphorylation and xylanase to mineral availability.

Option (D)

This option incorrectly associates phytase with phosphorylation, although phytase actually hydrolyzes phytate rather than phosphorylating molecules.

Comparison of All Options

Option	Matching	Status
A	P-4, Q-1, R-3, S-5	Incorrect
B	P-4, Q-1, R-2, S-3	Correct
C	P-5, Q-4, R-5, S-2	Incorrect
D	P-5, Q-1, R-2, S-3	Incorrect

Industrial Applications of Important Enzymes

Enzyme	Major Substrate	Industrial Application
Phytase	Phytic acid	Improves mineral availability in animal feed
Xylanase	Xylan	Paper and pulp processing
Laccase	Lignin and phenolic compounds	Delignification and biobleaching
Bromelain	Proteins	Gluten reduction and food processing

Comparison of the Enzymes

Enzyme	Enzyme Class	Source
Phytase	Hydrolase	Fungi, bacteria, plants
Xylanase	Hydrolase	Fungi and bacteria
Laccase	Oxidoreductase	Fungi, plants, bacteria
Bromelain	Protease	Pineapple (Ananas comosus)

Biological Significance

Industrial enzymes contribute significantly to sustainable biotechnology by replacing harsh chemical treatments with environmentally friendly biological processes. Phytase reduces phosphorus pollution, xylanase lowers chlorine use in paper production, laccase supports eco-friendly delignification, and bromelain improves food quality through controlled protein hydrolysis. Their industrial value continues to expand with advances in enzyme engineering and recombinant DNA technology.

Final Answer