Iowa State University Capstones, Theses and Retrospective Theses and Dissertations Dissertations

1940 Relationship of the lipolytic and proteolytic activities of various penicillia to the ripening of Christian Jensen Iowa State College

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Recommended Citation Jensen, Christian, "Relationship of the lipolytic and proteolytic activities of various penicillia to the ripening of blue cheese " (1940). Retrospective Theses and Dissertations. 13995. https://lib.dr.iastate.edu/rtd/13995

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RaATIOnSlIIP OF THI;) LIPOLYTIC AliD PKOTKOLYTIC ACTIVITIiiS

OF VARIOUS PEJ.'ICILLIA TO KIPBIilllG OF DLUE C.'IEUSK

by

C]iristia:i Jensen

A Thesis Subraittod to the Graduate Faculty for t}ie Dogreo of

DOCTOR OF PIIttOSOFirY

Major Subject Daily BactorioloQr

Approved;

Signature was redacted for privacy. In charge of Hajor work

Signature was redacted for privacy. Head^f Major Department

Signature was redacted for privacy.

ifcan "of Graduate College

lovm State College 1940 UMI Number: DP12788

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TABLE OF GOHTEHTS

Page

I, GENERAL INTRODUCTION 7

II. GENERAL STATMENT OP PROBLEM 9

HI. GENERAL RSVIBVY OF LITERA.TUBE 10

A* Hanufaoture of Blue Veined Cheeses 10

B. Microorgsuaiama of Importance in Ripening of Blue Teined Cheeses 11

C. Penioillia Associated vdth Ripening of Blue Veined Cheeses 12

D* General Aotion of Penioillia Aosooiated vdth Ripening of Blue Veined Cheeses IJ

E» Factors Affecting Grovrbh of Various Penicillia . II4.

F« Lipase in lililk 16

G« Flavor Production in Dluo Veinod Cheeses. .... 18

IV. GENERAL METHODS , , SJ

A. Source of Cultures «... 23

B. Basio Medium <>.*.. ••*..« 2U

C. Methods for Determino-tion of Lipolytic Aoti-rities

of Penioillia 2l|.

1. Media for deteinination of lipolyois . • Sh

a. Natural fa